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801.4273 | Michaela Kraus | Michaela Kraus, Jiri Kubat, Jiri Krticka | On the importance of the wind emission to the optical continuum of OB
supergiants | 8 pages, 12 figures, accepted for publication in A&A | Astron. Astrophys. 481 (2008) 499-506 | 10.1051/0004-6361:20078991 | null | astro-ph | null | Thermal wind emission in the form of free-free and free-bound emission is
known to show up in the infrared and radio continuum of hot and massive stars.
For OB supergiants with moderate mass loss rates and a wind velocity
distribution with \beta = 0.8...1.0, no influence of the wind to the optical
continuum, i.e. for \lambda < 1 micron, is expected. Investigations of stellar
and wind parameters of OB supergiants over the last few years suggest, however,
that for many objects \beta is much higher than 1.0, reaching values up to 3.5.
We investigate the influence of the free-free and free-bound emission on the
emerging radiation, especially at optical wavelengths, from OB supergiants
having wind velocity distributions with \beta > 1. For the case of a
spherically symmetric, isothermal wind in local thermodynamical equilibrium
(LTE) we calculate the free-free and free-bound processes and the emerging wind
and total continuum spectra. We localize the generation region of the optical
wind continuum and especially focus on the influence of a \beta-type wind
velocity distribution with \beta > 1 on the formation of the wind continuum at
optical wavelengths. The optical wind continuum is found to be generated within
about 2 R_* which is exactly the wind region where \beta strongly influences
the density distribution. We find that for \beta > 1, the continuum of a
typical OB supergiant can indeed be contaminated with thermal wind emission,
even at optical wavelengths. The strong increase in the optical wind emission
is dominantly produced by free-bound processes.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 13:54:34 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Kraus",
"Michaela",
""
],
[
"Kubat",
"Jiri",
""
],
[
"Krticka",
"Jiri",
""
]
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801.4274 | Grenville Croll | Karin Hodnigg, Markus Clermont, Roland T. Mittermeir | Computational Models of Spreadsheet Development: Basis for Educational
Approaches | 16 Pages, 4 figures, includes references | Proc. European Spreadsheet Risks Int. Grp. 2004 153-168 ISBN 1
902724 94 1 | null | null | cs.HC cs.SE | null | Among the multiple causes of high error rates in spreadsheets, lack of proper
training and of deep understanding of the computational model upon which
spreadsheet computations rest might not be the least issue. The paper addresses
this problem by presenting a didactical model focussing on cell interaction,
thus exceeding the atomicity of cell computations. The approach is motivated by
an investigation how different spreadsheet systems handle certain computational
issues implied from moving cells, copy-paste operations, or recursion.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 13:55:55 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Hodnigg",
"Karin",
""
],
[
"Clermont",
"Markus",
""
],
[
"Mittermeir",
"Roland T.",
""
]
] | [
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801.4275 | Damien Vandembroucq | Mehdi Talamali (SVI), Viljo Pet\"aj\"a (SVI), Damien Vandembroucq
(SVI, PMMH), St\'ephane Roux (LMT) | Path independent integrals to identify localized plastic events in two
dimensions | null | Physical Review E: Statistical, Nonlinear, and Soft Matter Physics
78, 1 (2008) 016109 | 10.1103/PhysRevE.78.016109 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a power expansion representation of plane elasticity complex
potentials due to Kolossov and Muskhelishvili, to compute the elastic fields
induced by a localized plastic deformation event. Far from its center, the
dominant contributions correspond to first order singularities of quadrupolar
and dipolar symmetry which can be associated respectively to pure deviatoric
and pure volumetric plastic strain of an equivalent circular inclusion.
Constructing holomorphic functions from the displacement field and its
derivatives, it is possible to define path independent Cauchy integrals which
capture the amplitudes of these singularities. Analytical expressions and
numerical tests on simple finite element data are presented. The development of
such numerical tools is of direct interest for the identification of local
structural reorganizations which are believed to be the key mechanisms for
plasticity of amorphous materials.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 13:57:40 GMT"
},
{
"version": "v2",
"created": "Wed, 13 May 2009 17:46:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Talamali",
"Mehdi",
"",
"SVI"
],
[
"Petäjä",
"Viljo",
"",
"SVI"
],
[
"Vandembroucq",
"Damien",
"",
"SVI, PMMH"
],
[
"Roux",
"Stéphane",
"",
"LMT"
]
] | [
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] |
801.4276 | Sergey Denisov | S. Denisov | Ratchet transport with subdiffusion | 5 pages, 3 figures | null | 10.1140/epjst/e2008-00639-5 | null | cond-mat.stat-mech | null | We introduce a model which incorporate the subdiffusive dynamics and the
ratchet effect. Using a subordination ideology, we show that the resulting
directed transport is sublinear, $<x(t)> \simeq Jt^{\beta}$, $\beta < 1$. The
proposed model may be relevant to a phenomenon of saltatory microbiological
motility.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 13:58:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Denisov",
"S.",
""
]
] | [
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] |
801.4277 | Pyungwon Ko | N. Cipriano Ribeiro, T. Kajita, P. Ko, H. Minakata, S. Nakayama, H.
Nunokawa | Probing Nonstandard Neutrino Physics at T2KK | To appear in the Proceeding of the 3rd International Workshop on Far
Detector in Korea for the J-PARC Neutrino Beam (T2KK) | null | null | null | hep-ph | null | Having a far detector in Korea for the J-PARC neutrino beam in addition to
one at Kamioka has been shown to be a powerful way to lift neutrino parameter
($\Delta m^2$ and mixing angles) degeneracies. In this talk, I report the
sensitivity of the same experimental setup to nonstandard neutrino physics,
such as quantum decoherence, violation of Lorentz symmetry (with/without CPT
invariance), and nonstandard neutrino interactions with matter. In many cases,
two detector setup is better than one detector setup at SK. This observation
makes another support for the two detector setup.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 13:59:39 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Ribeiro",
"N. Cipriano",
""
],
[
"Kajita",
"T.",
""
],
[
"Ko",
"P.",
""
],
[
"Minakata",
"H.",
""
],
[
"Nakayama",
"S.",
""
],
[
"Nunokawa",
"H.",
""
]
] | [
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] |
801.4278 | Shu-Dong Zhang | Shu-Dong Zhang and Timothy W. Gant | A simple and robust method for connecting small-molecule drugs using
gene-expression signatures | 8 pages, 2 figures, and 2 tables; supplementary data supplied as a
ZIP file | BMC Bioinformatics 2008, 9:258 | 10.1186/1471-2105-9-258 | null | q-bio.QM q-bio.GN | null | Interaction of a drug or chemical with a biological system can result in a
gene-expression profile or signature characteristic of the event. Using a
suitably robust algorithm these signatures can potentially be used to connect
molecules with similar pharmacological or toxicological properties. The
Connectivity Map was a novel concept and innovative tool first introduced by
Lamb et al to connect small molecules, genes, and diseases using genomic
signatures [Lamb et al (2006), Science 313, 1929-1935]. However, the
Connectivity Map had some limitations, particularly there was no effective
safeguard against false connections if the observed connections were considered
on an individual-by-individual basis. Further when several connections to the
same small-molecule compound were viewed as a set, the implicit null hypothesis
tested was not the most relevant one for the discovery of real connections.
Here we propose a simple and robust method for constructing the reference
gene-expression profiles and a new connection scoring scheme, which importantly
allows the valuation of statistical significance of all the connections
observed. We tested the new method with the two example gene-signatures (HDAC
inhibitors and Estrogens) used by Lamb et al and also a new gene signature of
immunosuppressive drugs. Our testing with this new method shows that it
achieves a higher level of specificity and sensitivity than the original
method. For example, our method successfully identified raloxifene and
tamoxifen as having significant anti-estrogen effects, while Lamb et al's
Connectivity Map failed to identify these. With these properties our new method
has potential use in drug development for the recognition of pharmacological
and toxicological properties in new drug candidates.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:00:01 GMT"
}
] | 2008-06-02T00:00:00 | [
[
"Zhang",
"Shu-Dong",
""
],
[
"Gant",
"Timothy W.",
""
]
] | [
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] |
801.4279 | J. Johansson | J.X. Zheng-Johansson | Doebner-Goldin Equation for Electrodynamic Particle. The Implied
Applications | Presentation at SNMP7. v2: with text update; including an appendix
"Dirac Equation for Electrodynamic Particles", presentation at QTS5 | J Phys: Conf Series 128, 012019 (2008), Proc Vth Int Sympo Quantum
Theory & Symmetries | null | null | physics.gen-ph | null | We set up the Maxwell's equations and the corresponding classical wave
equations for the electromagnetic waves which together with the generating
source, a traveling oscillatory charge of zero rest mass, comprise a particle
traveling in the force field of an usual conservative potential and an
additional frictional force $f$. At the de Broglie wavelength scale and in the
classic-velocity limit, the total wave equation decomposes into a component
equation describing the particle kinetic motion, which for $f=0$ identifies
with the usual linear Schr\"odinger equation as previously. The $f$-dependent
probability density presents generally an observable diffusion current of a
real diffusion constant; this and the particle's usual quantum diffusion
current as a whole are under adiabatic condition conserved and obey the
Fokker-Planck equation. The corresponding extra, $f$-dependent term in the
Hamiltonian operator identifies with that obtained by H.-D. Doebner and G.A.
Goldin. The friction produces to the particle's wave amplitude a damping that
can describe well the effect due to a radiation (de)polarization field, which
is always by-produced by the particle's oscillatory charge in a (nonpolar)
dielectric medium. The radiation depolarization field in a dielectric vacuum
has two separate significances: it participates to exert on another particle an
attractive, depolarization radiation force which resembles in overall respects
Newton's universal gravity as we showed earlier, and it exerts on the particle
itself an attractive, self depolarization radiation force whose time rate gives
directly the frictional force $f$.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:02:29 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Feb 2008 10:35:05 GMT"
}
] | 2008-10-05T00:00:00 | [
[
"Zheng-Johansson",
"J. X.",
""
]
] | [
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801.428 | Grenville Croll | Yirsaw Ayalew, Roland Mittermeir | Spreadsheet Debugging | 13 Pages, 4 figues | Proc. European Spreadsheet Risks Int. Grp. 2003 67-79 ISBN 1 86166
199 1 | null | null | cs.SE cs.PL | null | Spreadsheet programs, artifacts developed by non-programmers, are used for a
variety of important tasks and decisions. Yet a significant proportion of them
have severe quality problems. To address this issue, our previous work
presented an interval-based testing methodology for spreadsheets.
Interval-based testing rests on the observation that spreadsheets are mainly
used for numerical computations. It also incorporates ideas from symbolic
testing and interval analysis. This paper addresses the issue of efficiently
debugging spreadsheets. Based on the interval-based testing methodology, this
paper presents a technique for tracing faults in spreadsheet programs. The
fault tracing technique proposed uses the dataflow information and cell marks
to identify the most influential faulty cell(s) for a given formula cell
containing a propagated fault.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:07:58 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Ayalew",
"Yirsaw",
""
],
[
"Mittermeir",
"Roland",
""
]
] | [
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] |
801.4281 | Riccardo Chelli | Christopher P. Calderon, Riccardo Chelli | Approximating nonequilibrium processes using a collection of surrogate
diffusion models | 13 pages, 7 figures | J. Chem. Phys. (2008) no. 145103 vol. 128 | 10.1063/1.2903439 | null | cond-mat.stat-mech | null | The surrogate process approximation (SPA) is applied to model the
nonequilibrium dynamics of a reaction coordinate (RC) associated with the
unfolding and refolding processes of a deca-alanine peptide at 300 K. The RC
dynamics, which correspond to the evolution of the end-to-end distance of the
polypeptide, are produced by steered molecular dynamics (SMD) simulations and
approximated using overdamped diffusion models. We show that the collection of
(estimated) SPA models contain structural information "orthogonal" to the RC
monitored in this study. Functional data analysis ideas are used to correlate
functions associated with the fitted SPA models with the work done on the
system in SMD simulations. It is demonstrated that the shape of the
nonequilibrium work distributions for the unfolding and refolding processes of
deca-alanine can be predicted with functional data analysis ideas using a
relatively small number of simulated SMD paths for calibrating the SPA
diffusion models.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:15:32 GMT"
}
] | 2008-04-16T00:00:00 | [
[
"Calderon",
"Christopher P.",
""
],
[
"Chelli",
"Riccardo",
""
]
] | [
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] |
801.4282 | Olena Linnyk | O. Linnyk, E. L. Bratkovskaya, W. Cassing | Evidence for non-hadronic interactions of charm degrees of freedom in
heavy-ion collisions at relativistic energies | 35 pages, 16 Figs, v2: additional figure and corresponding changes to
the text | Nucl.Phys.A807:79-104,2008 | 10.1016/j.nuclphysa.2008.03.016 | null | nucl-th hep-ph | null | Within the Hadron-String Dynamics (HSD) transport approach we study the
suppression pattern of charmonia at RHIC with respect to centrality and
rapidity employing various model concepts such as variants of the 'comover
absorption' model or the 'charmonium melting' scenario. We find that especially
the ratio of the forward to mid-rapidity nuclear modification factors of J/Psi
(R_AA (forward) / R_AA (mid)) cannot be explained by the interactions with
'formed' comoving mesons or by the 'color screening mechanism' alone. Only when
incorporating interactions of the c or c-bar quark with a pre-hadronic medium
satisfactory results are obtained. A detailed comparison to the PHENIX data
demonstrates that non-hadronic interactions are mandatory to describe the
narrowing of the J/Psi rapidity distribution from p+p to central Au+Au
collisions. The Psi' to J/Psi ratio is found to be crucial in disentangling the
different charmonium absorption scenarios especially in the RHIC energy range.
Furthermore, a comparison of the transport calculations to the statistical
model of Gorenstein and Gazdzicki as well as the statistical hadronization
model of Andronic et al. shows differences in the energy dependence as well as
centrality dependence of the J/Psi to pion ratio which may be exploited
experimentally to disentangle different concepts. We find additionally that the
collective flow of charm in the HSD transport appears compatible with the data
at SPS energies but substantially underestimates the data at top RHIC energies
such that the large elliptic flow v_2 of charm seen experimentally has to be
attributed to early interactions of non-hadronic degrees of freedom.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:45:22 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 17:30:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Linnyk",
"O.",
""
],
[
"Bratkovskaya",
"E. L.",
""
],
[
"Cassing",
"W.",
""
]
] | [
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] |
801.4283 | Erwan Brugall\'e | Erwan Brugalle Oliver Labs | Surfaces with Many Solitary Points | 13 pages, 1 figure | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is classically known that a real cubic surface in the real projective
3-space cannot have more than one solitary point (locally given by
x^2+y^2+z^2=0) whereas it can have up to four nodes (x^2+y^2-z^2=0). We show
that on any surface of degree at least 3 in the real projective 3-space, the
maximum possible number of solitary points is strictly smaller than the maximum
possible number of nodes. Conversely, we adapt a construction of Chmutov to
obtain surfaces with many solitary points by using a refined version of
Brusotti's theorem. Finally, we adapt this construction to get real algebraic
surfaces with many singular points of type $A_{2k-1}^\smbullet$ for all $k\ge
1$.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:14:38 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Dec 2008 17:54:51 GMT"
}
] | 2008-12-17T00:00:00 | [
[
"Labs",
"Erwan Brugalle Oliver",
""
]
] | [
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] |
801.4284 | Pyungwon Ko | Pyungwon Ko | Electroweak symmetry breaking and cold dark matter from hidden sector
technicolor | To appear in the proceeding of the 4th International Conference on
Flavor Physics | Int.J.Mod.Phys.A23:3348-3351,2008 | 10.1142/S0217751X08042109 | null | hep-ph | null | We consider models with a vectorlike confining gauge theory in the hidden
sector, and demonstrate that the origin of the electroweak symmetry breaking
(EWSB) is due to the dimensional transmutation in the hidden sector gauge
theory, and the lightest mesons in the hidden sector could be a good cold dark
matter (CDM) candidate. There would be more than one neutral Higgs-like scalar
bosons, and they could decay mainly into the CDM pair, if that decay channel is
kinemtically allowed.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:14:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ko",
"Pyungwon",
""
]
] | [
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] |
801.4285 | Bahlali Seid | Seid Bahlali | A general necessary and sufficient optimality conditions for singular
control problems | null | null | null | null | math.PR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a stochastic control problem where the set of strict (classical)
controls is not necessarily convex and the the variable control has two
components, the first being absolutely continuous and the second singular. The
system is governed by a nonlinear stochastic differential equation, in which
the absolutely continuous component of the control enters both the drift and
the diffusion coefficients. By introducing a new approach, we establish
necessary and sufficient optimality conditions for two models. The first
concerns the relaxed-singular controls, who are a pair of processes whose first
component is a measure-valued processes. The second is a particular case of the
first and relates to strict-singular control problems. These results are given
in the form of global stochastic maximum principle by using only the first
order expansion and the associated adjoint equation. This improves and
generalizes all the previous works on the maximum principle of controlled
stochastic differential equations.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:44:05 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 15:56:32 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Jul 2008 14:07:44 GMT"
},
{
"version": "v4",
"created": "Sat, 20 Dec 2008 14:08:50 GMT"
}
] | 2008-12-20T00:00:00 | [
[
"Bahlali",
"Seid",
""
]
] | [
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] |
801.4286 | Douglas Gies | D. R. Gies, C. T. Bolton, R. M. Blake, S. M. Caballero-Nieves, D. M.
Crenshaw, P. Hadrava, A. Herrero, T. C. Hillwig, S. B. Howell, W. Huang, L.
Kaper, P. Koubsky, and M. V. McSwain | Stellar Wind Variations During the X-ray High and Low States of Cygnus
X-1 | ApJ, in press, 41 pages, 15 figures | null | 10.1086/586690 | null | astro-ph | null | We present results from Hubble Space Telescope UV spectroscopy of the massive
X-ray binary system, HD226868 = Cyg X-1. The spectra were obtained at both
orbital conjunction phases in two separate runs in 2002 and 2003 when the
system was in the X-ray high/soft state. The stellar wind lines suffer large
reductions in strength when the black hole is in the foreground due to the
X-ray ionization of the wind ions. A comparison of HST and archival IUE spectra
shows that similar photoionization effects occur in both the X-ray states. We
constructed model UV wind line profiles assuming that X-ray ionization occurs
everywhere in the wind except the zone where the supergiant blocks the X-ray
flux. The good match between the observed and model profiles indicates that the
wind ionization extends to near to the hemisphere of the supergiant facing the
X-ray source. The H-alpha emission strength is generally lower in the high/soft
state compared to the low/hard state, but the He II 4686 emission is relatively
constant between states. The results suggest that mass transfer in Cyg X-1 is
dominated by a focused wind flow that peaks along the axis joining the stars
and that the stellar wind contribution is shut down by X-ray photoionization
effects. The strong stellar wind from the shadowed side of the supergiant will
stall when Coriolis deflection brings the gas into the region of X-ray
illumination. This stalled gas component may be overtaken by the orbital motion
of the black hole and act to inhibit accretion from the focused wind. The
variations in the strength of the shadow wind component may then lead to
accretion rate changes that ultimately determine the X-ray state.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:17:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gies",
"D. R.",
""
],
[
"Bolton",
"C. T.",
""
],
[
"Blake",
"R. M.",
""
],
[
"Caballero-Nieves",
"S. M.",
""
],
[
"Crenshaw",
"D. M.",
""
],
[
"Hadrava",
"P.",
""
],
[
"Herrero",
"A.",
""
],
[
"Hillwig",
"T. C.",
""
],
[
"Howell",
"S. B.",
""
],
[
"Huang",
"W.",
""
],
[
"Kaper",
"L.",
""
],
[
"Koubsky",
"P.",
""
],
[
"McSwain",
"M. V.",
""
]
] | [
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] |
801.4287 | Uwe Aickelin | Qi Chen and Uwe Aickelin | Movie Recommendation Systems Using An Artificial Immune System | null | 6th International Conference in Adaptive Computing in Design and
Manufacture (ACDM 2004), Bristol, UK, 2004 | null | null | cs.NE cs.AI | null | We apply the Artificial Immune System (AIS) technology to the Collaborative
Filtering (CF) technology when we build the movie recommendation system. Two
different affinity measure algorithms of AIS, Kendall tau and Weighted Kappa,
are used to calculate the correlation coefficients for this movie
recommendation system. From the testing we think that Weighted Kappa is more
suitable than Kendall tau for movie problems.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:19:12 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 17:05:58 GMT"
}
] | 2010-07-05T00:00:00 | [
[
"Chen",
"Qi",
""
],
[
"Aickelin",
"Uwe",
""
]
] | [
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] |
801.4288 | Enrico Carlini | E.Carlini, L.Chiantini and A.V.Geramita | Complete intersections on general hypersurfaces | null | null | null | null | math.AG math.AC | null | We ask when certain complete intersections of codimension $r$ can lie on a
generic hypersurface in $\PP^n$. We give a complete answer to this question
when $2r \leq n+2$ in terms of the degrees of the hypersurfaces and of the
degrees of the generators of the complete intersection.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:20:33 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Carlini",
"E.",
""
],
[
"Chiantini",
"L.",
""
],
[
"Geramita",
"A. V.",
""
]
] | [
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] |
801.4289 | Samantha Searle | Samantha C. Searle, Raman K. Prinja, Derck Massa and Robert Ryans | Quantitative studies of the optical and UV spectra of Galactic early B
supergiants I. Fundamental parameters | A&A in press; 35 pages, 33 figures | null | 10.1051/0004-6361:20077125 | null | astro-ph | null | We undertake an optical and ultraviolet spectroscopic analysis of a sample of
20 Galactic B0 - B5 supergiants of luminosity classes Ia, Ib, Iab and II.
Fundamental stellar parameters are obtained from optical diagnostics and a
critical comparison of the model predictions to observed UV spectral features
is made. These parameters are derived for individual stars using CMFGEN, the
nLTE, line-blanketed model atmosphere code of Hillier et al., 1998. The B
supergiant temperature scale derived here shows a reduction of 1000 - 3000 K
compared to previous results obtained using unblanketed codes. Mass loss rate
estimates are in good agreement with predicted theoretical values and all of
the 20 B0 - B5 supergiants analysed show evidence for CNO processing. The
observed WLR values calculated for B0 - B0.7 supergiants are larger than
predicted values, whereas the reverse is true for B1 - B5 supergiants. This
means that the discrepancy between observed and theoretical values cannot be
resolved by adopting clumped (i.e., lower) mass loss rates, as for O stars. The
most surprising result is that, although CMFGEN succeeds in reproducing the
optical spectrum accurately, it fails to reproduce key UV diagnostics, such as
NV and CIV P Cygni profiles, precisely. This problem arises because the models
are not ionised enough and fail to reproduce the full extent of the observed
absorption trough of the P Cygni profiles. These findings add further support
to the need to revise the standard model of massive star winds.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:51:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Searle",
"Samantha C.",
""
],
[
"Prinja",
"Raman K.",
""
],
[
"Massa",
"Derck",
""
],
[
"Ryans",
"Robert",
""
]
] | [
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] |
801.429 | Guillaume Pouchin | Guillaume Pouchin | A geometric Schur-Weyl duality for quotients of affine Hecke algebras | null | null | null | null | math.RT | null | After establishing a geometric Schur-Weyl duality in a general setting, we
recall this duality in type A in the finite and affine case. We extend the
duality in the affine case to positive parts of the affine algebras. The
positive parts have nice ideals coming from geometry, allowing duality for
quotients. Some of the quotients of the positive affine Hecke algebra are then
identified to some cyclotomic Hecke algebras and the geometric setting allows
the construction of canonical bases.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:26:00 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 16:11:17 GMT"
}
] | 2008-03-19T00:00:00 | [
[
"Pouchin",
"Guillaume",
""
]
] | [
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] |
801.4291 | Paolo Amore Dr | Paolo Amore | Solving the Helmholtz equation for membranes of arbitrary shape | 32 pages, 22 figures, 6 tables | null | 10.1088/1751-8113/41/26/265206 | null | physics.comp-ph | null | I calculate the modes of vibration of membranes of arbitrary shape using a
collocation approach based on Little Sinc Functions. The matrix representation
of the PDE obtained using this method is explicit and it does not require the
calculation of integrals. To illustrate the virtues of this approach, I have
considered a large number of examples,part of them taken from the literature,
and part of them new. When possible, I have testedthe accuracy of these results
by comparing them with the exact results (when available) or with results from
the literature. In particular, in the case of the L-shaped membrane, the first
example discussed in the paper, I show that it is possible to extrapolate the
results obtained with different grid sizes to obtain higly precise results.
Finally, I also show that the present collocation technique can be easily
combined with conformal mapping to provide numerical approximations to the
energies which quite rapidly converge to the exact results.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 13:55:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amore",
"Paolo",
""
]
] | [
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] |
801.4292 | Joel Goossens | Liliana Cucu and Jo\"el Goossens | Exact Feasibility Tests for Real-Time Scheduling of Periodic Tasks upon
Multiprocessor Platforms | null | null | null | null | cs.OS | null | In this paper we study the global scheduling of periodic task systems upon
multiprocessor platforms. We first show two very general properties which are
well-known for uniprocessor platforms and which remain for multiprocessor
platforms: (i) under few and not so restrictive assumptions, we show that
feasible schedules of periodic task systems are periodic from some point with a
period equal to the least common multiple of task periods and (ii) for the
specific case of synchronous periodic task systems, we show that feasible
schedules repeat from the origin. We then present our main result: we
characterize, for task-level fixed-priority schedulers and for asynchronous
constrained or arbitrary deadline periodic task models, upper bounds of the
first time instant where the schedule repeats. We show that job-level
fixed-priority schedulers are predictable upon unrelated multiprocessor
platforms. For task-level fixed-priority schedulers, based on the upper bounds
and the predictability property, we provide for asynchronous constrained or
arbitrary deadline periodic task sets, exact feasibility tests. Finally, for
the job-level fixed-priority EDF scheduler, for which such an upper bound
remains unknown, we provide an exact feasibility test as well.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:30:34 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Cucu",
"Liliana",
""
],
[
"Goossens",
"Joël",
""
]
] | [
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] |
801.4293 | Petr Dunin-Barkowski | Petr Dunin-Barkowski, Alexei Sleptsov | Geometric Hamiltonian Formalism for Reparametrization Invariant Theories
with Higher Derivatives | 19 pages | Theor.Math.Phys.158:61-81, 2009 | 10.1007/s11232-009-0005-7 | null | hep-th math-ph math.MP | null | Reparametrization invariant Lagrangian theories with higher derivatives are
considered. We investigate the geometric structures behind these theories and
construct the Hamiltonian formalism in a geometric way. The Legendre
transformation which corresponds to the transition from the Lagrangian
formalism to the Hamiltonian formalism is non-trivial in this case. The
resulting phase bundle, i.e. the image of the Legendre transformation, is a
submanifold of some cotangent bundle. We show that in our construction it is
always odd-dimensional. Therefore the canonical symplectic two-form from the
ambient cotangent bundle generates on the phase bundle a field of the
null-directions of its restriction. It is shown that the integral lines of this
field project directly to the extremals of the action on the configuration
manifold. Therefore this naturally arising field is what is called the Hamilton
field. We also express the corresponding Hamilton equations through the
generilized Nambu bracket.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:36:11 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 16:20:33 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Dunin-Barkowski",
"Petr",
""
],
[
"Sleptsov",
"Alexei",
""
]
] | [
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] |
801.4294 | Casey Law | C. J. Law (Amsterdam), F. Yusef-Zadeh (Northwestern), W. D. Cotton
(NRAO), and R. J. Maddalena (NRAO) | GBT Multiwavelength Survey of the Galactic Center Region | Accepted to ApJS. 40 pages, 46 figures, 8 tables (emulate apj style) | null | 10.1086/533587 | null | astro-ph | null | We describe the results of a radio continuum survey of the central 4x1deg
with the 100 m Green Bank Telescope (GBT) at wavelengths of 3.5, 6, 20, and 90
cm. The 3.5 and 6 cm surveys are the most sensitive and highest resolution
single dish surveys made of the central degrees of our Galaxy. We present
catalogs of compact and extended sources in the central four degrees of our
Galaxy, including detailed spectral index studies of all sources. The analysis
covers star-forming regions such as Sgr B and Sgr C where we find evidence of a
mixture of thermal and nonthermal emission. The analysis quantifies the
relative contribution of thermal and nonthermal processes to the radio
continuum flux density toward the GC region. In the central 4x1deg of the GC,
the thermal and nonthermal flux fractions for all compact and diffuse sources
are 28%/72% at 3.5 cm and 19%/81% at 6 cm. The total flux densities from these
sources are 783+-52 Jy and 1063+-93 Jy at 3.5 and 6 cm, respectively, excluding
the contribution of Galactic synchrotron emission.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 11:15:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Law",
"C. J.",
"",
"Amsterdam"
],
[
"Yusef-Zadeh",
"F.",
"",
"Northwestern"
],
[
"Cotton",
"W. D.",
"",
"NRAO"
],
[
"Maddalena",
"R. J.",
"",
"NRAO"
]
] | [
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] |
801.4295 | Marc Troyanov | Vladimir Gol'dshtein and Marc Troyanov | On the naturality of the exterior differential | 9 pages | null | null | null | math.AP | null | We give sufficient conditions for the naturallity of the exterior
differential under Sobolev mappings. In other words we study the validity of
the equation $d f^* \alpha = f^* d\alpha$ for a smooth form $\alpha$ and a
Sobolev map $f$.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:41:31 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Gol'dshtein",
"Vladimir",
""
],
[
"Troyanov",
"Marc",
""
]
] | [
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] |
801.4296 | Sergey Denisov | S. Denisov, Y. Zolotaryuk, S. Flach, and O. Yevtushenko | Vortex and translational currents due to broken time-space symmetries | 4 pages, 2 figures | Phys. Rev. Lett. 100, 224102 (2008) | 10.1103/PhysRevLett.100.224102 | null | cond-mat.stat-mech | null | We consider the classical dynamics of a particle in a $d=2,3$-dimensional
space-periodic potential under the influence of time-periodic external fields
with zero mean. We perform a general time-space symmetry analysis and identify
conditions, when the particle will generate a nonzero averaged translational
and vortex currents. We perform computational studies of the equations of
motion and of corresponding Fokker-Planck equations, which confirm the symmetry
predictions. We address the experimentally important issue of current control.
Cold atoms in optical potentials and magnetic traps are among possible
candidates to observe these findings experimentally.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:41:46 GMT"
}
] | 2009-07-02T00:00:00 | [
[
"Denisov",
"S.",
""
],
[
"Zolotaryuk",
"Y.",
""
],
[
"Flach",
"S.",
""
],
[
"Yevtushenko",
"O.",
""
]
] | [
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] |
801.4297 | Chad Hanna | Chad Hanna, Miguel Megevand, Evan Ochsner, and Carlos Palenzuela | Method to estimate ISCO and ring-down frequencies in binary systems and
consequences for gravitational wave data analysis | Added references to section 3 14 pages 5 figures. Submitted to
Classical and Quantum Gravity | Class.Quant.Grav.26:015009,2009 | 10.1088/0264-9381/26/1/015009 | null | gr-qc | null | Recent advances in the description of compact binary systems have produced
gravitational waveforms that include inspiral, merger and ring-down phases.
Comparing results from numerical simulations with those of post-Newtonian (PN),
and related, expansions has provided motivation for employing PN waveforms in
near merger epochs when searching for gravitational waves and has encouraged
the development of analytic fits to full numerical waveforms. The models and
simulations do not yet cover the full binary coalescence parameter space. For
these yet un-simulated regions, data analysts can still conduct separate
inspiral, merger and ring-down searches. Improved knowledge about the end of
the inspiral phase, the beginning of the merger, and the ring-down frequencies
could increase the efficiency of both coherent inspiral-merger-ring-down (IMR)
searches and searches over each phase separately. Insight can be gained for all
three cases through a recently presented theoretical calculation, which,
corroborated by the numerical results, provides an implicit formula for the
final spin of the merged black holes, accurate to within 10% over a large
parameter space. Knowledge of the final spin allows one to predict the end of
the inspiral phase and the quasinormal mode ring-down frequencies, and in turn
provides information about the bandwidth and duration of the merger. In this
work we will discuss a few of the implications of this calculation for data
analysis.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:41:56 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 23:48:49 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Hanna",
"Chad",
""
],
[
"Megevand",
"Miguel",
""
],
[
"Ochsner",
"Evan",
""
],
[
"Palenzuela",
"Carlos",
""
]
] | [
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] |
801.4298 | Yan Liqin | Li-qin Yan, Wen Yin, Ferran Maci\'a, Jun-rong Zhang, Lun-hua He and
Fang-wei Wang | Magnetic-field-induced transition from metastable spin glass to possible
antiferromagnetic-ferromagnetic phase separation in $Cd_{0.5}Cu_{0.5}Cr_2O_4$ | one tex,4 figures, 1 bib | null | 10.1016/j.jmmm.2009.01.012 | null | cond-mat.mtrl-sci cond-mat.dis-nn cond-mat.str-el | null | Using ac susceptibility, dc magnetization and heat capacity measurements, we
have investigated the magnetic properties of $Cd_{0.5}Cu_{0.5}Cr_2O_4$.
$Cd_{0.5}Cu_{0.5}Cr_2O_4$ has an extraordinary magnetic phase including a
metastable spin-glass(SG) phase at zero field, a possible phase separation
scenario of AFM/FM above $\sim 0.5T$ field, and at intermediate fields, an
apparent pseudo reentrant spin-glass (RSG) plateau is observed. These phenomena
are closely correlated with the pinning effect of the $Cu^{2+}$ sublattice on
the frustrated lattice.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:55:35 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Yan",
"Li-qin",
""
],
[
"Yin",
"Wen",
""
],
[
"Maciá",
"Ferran",
""
],
[
"Zhang",
"Jun-rong",
""
],
[
"He",
"Lun-hua",
""
],
[
"Wang",
"Fang-wei",
""
]
] | [
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801.4299 | Lagache | N. Fernandez-Conde, G. Lagache, J.-L. Puget, H. Dole | Simulations of the cosmic infrared and submillimeter background for
future large surveys: I. Presentation and first application to Herschel/SPIRE
and Planck/HFI | A&A, 2008, in press | null | 10.1051/0004-6361:20078188 | null | astro-ph | null | The coming Planck and Herschel missions will survey the sky at unprecedented
angular scales and sensitivities. Simulations are needed for better
interpretating the results of the surveys and for testing new methods of, e.g.,
source extraction and component separation. We present new simulations of the
infrared and submillimeter cosmic background, including the correlation between
infrared galaxies. The simulations were used to quantify the source-detection
thresholds for Herschel/SPIRE and Planck/HFI, as well as to study the
detectability of the cosmic infrared background correlated fluctuations.
The simulations are based on an empirical model of IR galaxy evolution. For
the correlations, we only included the linear clustering, assuming that
infrared galaxies are biased tracers of the dark-matter fluctuation density
field. We used the simulations with different bias parameters to predict the
confusion noise for Herschel/SPIRE and Planck/HFI and the completeness levels.
We also discuss the detectability of the linear clustering in Planck/HFI power
spectra, including the foreground and backgrounds components.
Simulated maps and catalogs are publicly available online at
http://www.ias.u-psud.fr/irgalaxies/simulations.php
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:56:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fernandez-Conde",
"N.",
""
],
[
"Lagache",
"G.",
""
],
[
"Puget",
"J. -L.",
""
],
[
"Dole",
"H.",
""
]
] | [
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] |
801.43 | Sanjib Sabhapandit | Alain Comtet, Satya N. Majumdar, and Sanjib Sabhapandit | A note on limit shapes of minimal difference partitions | 9 pages, 2 figures | Journal of Mathematical Physics, Analysis, Geometry, vol. 4, No.
1, pp. 24-32 (2008) | null | null | cond-mat.stat-mech math-ph math.CO math.MP | null | We provide a variational derivation of the limit shape of minimal difference
partitions and discuss the link with exclusion statistics. Also see
arXiv:0707.2312 for a related paper.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 14:56:38 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Comtet",
"Alain",
""
],
[
"Majumdar",
"Satya N.",
""
],
[
"Sabhapandit",
"Sanjib",
""
]
] | [
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] |
801.4301 | Laurent Jacob | Laurent Jacob (CB), Brice Hoffmann (CB), V\'eronique Stoven (CB),
Jean-Philippe Vert (CB) | Virtual screening of GPCRs: an in silico chemogenomics approach | null | null | null | null | q-bio.QM | null | The G-protein coupled receptor (GPCR) superfamily is currently the largest
class of therapeutic targets. \textit{In silico} prediction of interactions
between GPCRs and small molecules is therefore a crucial step in the drug
discovery process, which remains a daunting task due to the difficulty to
characterize the 3D structure of most GPCRs, and to the limited amount of known
ligands for some members of the superfamily. Chemogenomics, which attempts to
characterize interactions between all members of a target class and all small
molecules simultaneously, has recently been proposed as an interesting
alternative to traditional docking or ligand-based virtual screening
strategies. We propose new methods for in silico chemogenomics and validate
them on the virtual screening of GPCRs. The methods represent an extension of a
recently proposed machine learning strategy, based on support vector machines
(SVM), which provides a flexible framework to incorporate various information
sources on the biological space of targets and on the chemical space of small
molecules. We investigate the use of 2D and 3D descriptors for small molecules,
and test a variety of descriptors for GPCRs. We show fo instance that
incorporating information about the known hierarchical classification of the
target family and about key residues in their inferred binding pockets
significantly improves the prediction accuracy of our model. In particular we
are able to predict ligands of orphan GPCRs with an estimated accuracy of
78.1%.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:03:47 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Jacob",
"Laurent",
"",
"CB"
],
[
"Hoffmann",
"Brice",
"",
"CB"
],
[
"Stoven",
"Véronique",
"",
"CB"
],
[
"Vert",
"Jean-Philippe",
"",
"CB"
]
] | [
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] |
801.4302 | Sadhan Adhikari K | Sadhan K. Adhikari, Luca Salasnich | Nonlinear Schroedinger equation for a superfluid Bose gas from weak
coupling to unitarity: Study of vortices | 10 pages, 15 figures | Phys. Rev. A 77 (2008) 033618 (pp1-10) | 10.1103/PhysRevA.77.033618 | null | cond-mat.other | null | We introduce a nonlinear Schroedinger equation to describe the dynamics of a
superfluid Bose gas in the crossover from the weak-coupling regime, where $a
n^{1/3}\ll 1$ with $a$ the inter-atomic s-wave scattering length and $n$ the
bosonic density, to the unitarity limit, where $a\to +\infty$. We call this
equation the {unitarity Schroedinger equation} (USE). The zero-temperature bulk
equation of state of this USE is parametrized by the Lee-Yang-Huang low-density
expansion and Jastrow calculations at unitarity. With the help of the USE we
study the profiles of quantized vortices and vortex-core radius in a uniform
Bose gas. We also consider quantized vortices in a Bose gas under
cylindrically-symmetric harmonic confinement and study their profile and
chemical potential using the USE and compare the results with those obtained
from the Gross-Pitaevskii-type equations valid in the weak-coupling limit.
Finally, the USE is applied to calculate the breathing modes of the confined
Bose gas as a function of the scattering length.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:05:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Adhikari",
"Sadhan K.",
""
],
[
"Salasnich",
"Luca",
""
]
] | [
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] |
801.4303 | Fatine Latif | Ita\"i Ben Yaacov (ICJ), Alexander Usvyatsov (UCLA-CS) | Continuous first order logic and local stability | null | Transactions of the American Mathematical Society 362, 10 (2010)
5213-5259 | 10.1090/S0002-9947-10-04837-3 | null | math.LO | null | We develop continuous first order logic, a variant of the logic described in
\cite{Chang-Keisler:ContinuousModelTheory}. We show that this logic has the
same power of expression as the framework of open Hausdorff cats, and as such
extends Henson's logic for Banach space structures. We conclude with the
development of local stability, for which this logic is particularly
well-suited.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:06:07 GMT"
}
] | 2014-02-10T00:00:00 | [
[
"Yaacov",
"Itaï Ben",
"",
"ICJ"
],
[
"Usvyatsov",
"Alexander",
"",
"UCLA-CS"
]
] | [
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] |
801.4304 | Emanuele Nardini | E. Nardini G. Risaliti, M. Salvati, E. Sani, M. Imanishi, A. Marconi,
R. Maiolino | Spectral decomposition of starbursts and AGNs in 5-8 micron Spitzer IRS
spectra of local ULIRGs | 5 Pages, 3 figures. MNRAS Letters, Accepted | null | 10.1111/j.1745-3933.2008.00450.x | null | astro-ph | null | We present an analysis of the 5-8 micron Spitzer-IRS spectra of a sample of
68 local Ultraluminous Infrared Galaxies (ULIRGs). Our diagnostic technique
allows a clear separation of the active galactic nucleus (AGN) and starburst
(SB) components in the observed mid-IR emission, and a simple analytic model
provides a quantitative estimate of the AGN/starburst contribution to the
bolometric luminosity. We show that AGNs are ~30 times brighter at 6 micron
than starbursts with the same bolometric luminosity, so that even faint AGNs
can be detected. Star formation events are confirmed as the dominant power
source for extreme infrared activity, since ~85% of ULIRG luminosity arises
from the SB component. Nonetheless an AGN is present in the majority (46/68) of
our sources.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:16:14 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Risaliti",
"E. Nardini G.",
""
],
[
"Salvati",
"M.",
""
],
[
"Sani",
"E.",
""
],
[
"Imanishi",
"M.",
""
],
[
"Marconi",
"A.",
""
],
[
"Maiolino",
"R.",
""
]
] | [
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] |
801.4305 | Frank Schweitzer | J. Emeterio Navarro Barrientos, Frank E. Walter, Frank Schweitzer | Risk-Seeking versus Risk-Avoiding Investments in Noisy Periodic
Environments | 27 pp. v2 with minor corrections. See http://www.sg.ethz.ch for more
info | International Journal of Modern Physics C vol. 19, no. 6 (2008)
971-994 | 10.1142/S0129183108012662 | null | q-fin.PM cs.CE physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the performance of various agent strategies in an artificial
investment scenario. Agents are equipped with a budget, $x(t)$, and at each
time step invest a particular fraction, $q(t)$, of their budget. The return on
investment (RoI), $r(t)$, is characterized by a periodic function with
different types and levels of noise. Risk-avoiding agents choose their fraction
$q(t)$ proportional to the expected positive RoI, while risk-seeking agents
always choose a maximum value $q_{max}$ if they predict the RoI to be positive
("everything on red"). In addition to these different strategies, agents have
different capabilities to predict the future $r(t)$, dependent on their
internal complexity. Here, we compare 'zero-intelligent' agents using technical
analysis (such as moving least squares) with agents using reinforcement
learning or genetic algorithms to predict $r(t)$. The performance of agents is
measured by their average budget growth after a certain number of time steps.
We present results of extensive computer simulations, which show that, for our
given artificial environment, (i) the risk-seeking strategy outperforms the
risk-avoiding one, and (ii) the genetic algorithm was able to find this optimal
strategy itself, and thus outperforms other prediction approaches considered.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:09:58 GMT"
},
{
"version": "v2",
"created": "Sun, 7 Sep 2008 13:48:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barrientos",
"J. Emeterio Navarro",
""
],
[
"Walter",
"Frank E.",
""
],
[
"Schweitzer",
"Frank",
""
]
] | [
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] |
801.4306 | Martin Fraas | P. Exner, M. Fraas | Interlaced dense point and absolutely continuous spectra for
Hamiltonians with concentric-shell singular interactions | LaTeX, 18 pages | null | 10.1142/9789812832382_0005 | null | math-ph math.MP math.SP quant-ph | null | We analyze the spectrum of the generalized Schrodinger operator in
$L^2(R^\nu) \nu \geq 2$, with a general local, rotationally invariant singular
interaction supported by an infinite family of concentric, equidistantly spaced
spheres. It is shown that the essential spectrum consists of interlaced
segments of the dense point and absolutely continuous character, and that the
relation of their lengths at high energies depends on the choice of the
interaction parameters; generically the p.p. component is asymptotically
dominant. We also show that for $\nu=2$ there is an infinite family of
eigenvalues below the lowest band.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:20:17 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Exner",
"P.",
""
],
[
"Fraas",
"M.",
""
]
] | [
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] |
801.4307 | Uwe Aickelin | Uwe Aickelin and Qi Chen | On Affinity Measures for Artificial Immune System Movie Recommenders | null | Proceedings of the 5th International Conference on Recent Advances
in Soft Computing (RASC 2004), Nottingham, UK | null | null | cs.NE cs.AI cs.CY | null | We combine Artificial Immune Systems 'AIS', technology with Collaborative
Filtering 'CF' and use it to build a movie recommendation system. We already
know that Artificial Immune Systems work well as movie recommenders from
previous work by Cayzer and Aickelin 3, 4, 5. Here our aim is to investigate
the effect of different affinity measure algorithms for the AIS. Two different
affinity measures, Kendalls Tau and Weighted Kappa, are used to calculate the
correlation coefficients for the movie recommender. We compare the results with
those published previously and show that Weighted Kappa is more suitable than
others for movie problems. We also show that AIS are generally robust movie
recommenders and that, as long as a suitable affinity measure is chosen,
results are good.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:14:45 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 17:06:30 GMT"
},
{
"version": "v3",
"created": "Fri, 16 May 2008 10:44:44 GMT"
}
] | 2008-05-16T00:00:00 | [
[
"Aickelin",
"Uwe",
""
],
[
"Chen",
"Qi",
""
]
] | [
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] |
801.4308 | Jonathan Halliwell | J.J.Halliwell | Path Integral Analysis of Arrival Times with a Complex Potential | 8 pages | Physical Review A 77(6): 062103 (2008) | 10.1103/PhysRevA.77.062103 | null | quant-ph | null | A number of approaches to the arrival time problem employ a complex potential
of a simple step function type and the arrival time distribution may then be
calculated using the stationary scattering wave functions. Here, it is shown
that in the Zeno limit (in which the potential becomes very large), the arrival
time distribution may be obtained in a clear and simple way using a path
integral representation of the propagator together with the path decomposition
expansion (in which the propagator is factored across a surface of constant
time). This method also shows that the same result is obtained for a wide class
of complex potentials.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:17:31 GMT"
}
] | 2015-08-13T00:00:00 | [
[
"Halliwell",
"J. J.",
""
]
] | [
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] |
801.4309 | Michael Unger | M. Unger, B. R. Dawson, R. Engel, F. Sch\"ussler, R. Ulrich | Reconstruction of Longitudinal Profiles of Ultra-High Energy Cosmic Ray
Showers from Fluorescence and Cherenkov Light Measurements | accepted by NIM A | Nucl.Instrum.Meth.A588:433-441,2008 | 10.1016/j.nima.2008.01.100 | null | astro-ph | null | We present a new method for the reconstruction of the longitudinal profile of
extensive air showers induced by ultra-high energy cosmic rays. In contrast to
the typically considered shower size profile, this method employs directly the
ionization energy deposit of the shower particles in the atmosphere. Due to
universality of the energy spectra of electrons and positrons, both
fluorescence and Cherenkov light can be used simultaneously as signal to infer
the shower profile from the detected light. The method is based on an analytic
least-square solution for the estimation of the shower profile from the
observed light signal. Furthermore, the extrapolation of the observed part of
the profile with a Gaisser-Hillas function is discussed and the total
statistical uncertainty of shower parameters like total energy and shower
maximum is calculated.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:24:18 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Unger",
"M.",
""
],
[
"Dawson",
"B. R.",
""
],
[
"Engel",
"R.",
""
],
[
"Schüssler",
"F.",
""
],
[
"Ulrich",
"R.",
""
]
] | [
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801.431 | Michael Elkin | Michael Elkin | An Improved Construction of Progression-Free Sets | null | null | null | 0807 | math.NT math.GM | null | The problem of constructing dense subsets S of {1,2,..,n} that contain no
arithmetic triple was introduced by Erdos and Turan in 1936. They have
presented a construction with |S| = \Omega(n^{\log_3 2}) elements. Their
construction was improved by Salem and Spencer, and further improved by Behrend
in 1946. The lower bound of Behrend is |S| = Omega({n \over {2^{2 \sqrt{2}
\sqrt{\log_2 n}} \cdot \log^{1/4} n}}). Since then the problem became one of
the most central, most fundamental, and most intensively studied problems in
additive number theory. Nevertheless, no improvement of the lower bound of
Behrend was reported since 1946.
In this paper we present a construction that improves the result of Behrend
by a factor of Theta(\sqrt{\log n}), and shows that |S| = Omega({n \over {2^{2
\sqrt{2} \sqrt{\log_2 n}}}} \cdot \log^{1/4} n). In particular, our result
implies that the construction of Behrend is not optimal.
Our construction and proof are elementary and self-contained.
| [
{
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] | 2008-01-29T00:00:00 | [
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801.4311 | Laura Moli | L. Moli, A. Rodriguez, G. Seco-Granados | Performance of two decoy-state quantum cryptography protocols in
earth-satellite links | This paper has been withdrawn | null | 10.1109/JSAC.2009.091208 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper has been withdrawn by the author. It will be published again after
submission to a journal.
| [
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"created": "Mon, 28 Jan 2008 15:22:01 GMT"
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"version": "v2",
"created": "Wed, 27 Feb 2008 12:30:14 GMT"
},
{
"version": "v3",
"created": "Tue, 17 Jun 2008 18:09:34 GMT"
}
] | 2018-10-15T00:00:00 | [
[
"Moli",
"L.",
""
],
[
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"A.",
""
],
[
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"G.",
""
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] |
801.4312 | Uwe Aickelin | Uwe Aickelin, Edmund Burke and Aniza Din | Investigating Artificial Immune Systems For Job Shop Rescheduling In
Changing Environments | null | 6th International Conference in Adaptive Computing in Design and
Manufacture (ACDM 2004), Bristol, UK, 2004 | null | null | cs.NE cs.CE | null | Artificial immune system can be used to generate schedules in changing
environments and it has been proven to be more robust than schedules developed
using a genetic algorithm. Good schedules can be produced especially when the
number of the antigens is increased. However, an increase in the range of the
antigens had somehow affected the fitness of the immune system. In this
research, we are trying to improve the result of the system by rescheduling the
same problem using the same method while at the same time maintaining the
robustness of the schedules.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:26:59 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 17:03:46 GMT"
},
{
"version": "v3",
"created": "Fri, 16 May 2008 10:43:07 GMT"
}
] | 2010-07-05T00:00:00 | [
[
"Aickelin",
"Uwe",
""
],
[
"Burke",
"Edmund",
""
],
[
"Din",
"Aniza",
""
]
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801.4313 | John Veitch | John Veitch, Alberto Vecchio | A Bayesian approach to the follow-up of candidate gravitational wave
signals | 9 pages | Phys.Rev.D78:022001,2008 | 10.1103/PhysRevD.78.022001 | LIGO-P080005-00-Z | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ground-based gravitational wave laser interferometers (LIGO, GEO-600, Virgo
and Tama-300) have now reached high sensitivity and duty cycle. We present a
Bayesian evidence-based approach to the search for gravitational waves, in
particular aimed at the followup of candidate events generated by the analysis
pipeline. We introduce and demonstrate an efficient method to compute the
evidence and odds ratio between different models, and illustrate this approach
using the specific case of the gravitational wave signal generated during the
inspiral phase of binary systems, modelled at the leading quadrupole Newtonian
order, in synthetic noise. We show that the method is effective in detecting
signals at the detection threshold and it is robust against (some types of)
instrumental artefacts. The computational efficiency of this method makes it
scalable to the analysis of all the triggers generated by the analysis
pipelines to search for coalescing binaries in surveys with ground-based
interferometers, and to a whole variety of signal waveforms, characterised by a
larger number of parameters.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:07:18 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 12:34:55 GMT"
},
{
"version": "v3",
"created": "Fri, 4 Jul 2008 13:35:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Veitch",
"John",
""
],
[
"Vecchio",
"Alberto",
""
]
] | [
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801.4314 | Uwe Aickelin | Uwe Aickelin | Artificial Immune Systems (AIS) - A New Paradigm for Heuristic Decision
Making | null | Invited Keynote Talk, Annual Operational Research Conference 46,
York, UK, 2004 | null | null | cs.NE cs.AI | null | Over the last few years, more and more heuristic decision making techniques
have been inspired by nature, e.g. evolutionary algorithms, ant colony
optimisation and simulated annealing. More recently, a novel computational
intelligence technique inspired by immunology has emerged, called Artificial
Immune Systems (AIS). This immune system inspired technique has already been
useful in solving some computational problems. In this keynote, we will very
briefly describe the immune system metaphors that are relevant to AIS. We will
then give some illustrative real-world problems suitable for AIS use and show a
step-by-step algorithm walkthrough. A comparison of AIS to other well-known
algorithms and areas for future work will round this keynote off. It should be
noted that as AIS is still a young and evolving field, there is not yet a fixed
algorithm template and hence actual implementations might differ somewhat from
the examples given here.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:32:05 GMT"
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"version": "v2",
"created": "Mon, 3 Mar 2008 17:02:52 GMT"
},
{
"version": "v3",
"created": "Fri, 16 May 2008 10:46:24 GMT"
}
] | 2010-07-05T00:00:00 | [
[
"Aickelin",
"Uwe",
""
]
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0.0260676872,
-0.139983058,
0.0387504287,
-0.0120808473,
-0.0464030653,
0.0660935566,
-0.0564059466,
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] |
801.4315 | Joanna Goodger | J.L. Goodger, M.J. Hardcastle, J.H. Croston, N.E. Kassim and R.A.
Perley | Inverse-Compton emission from the lobes of 3C 353 | 12 pages, 13 figures and accepted to MNRAS | null | null | JLG01 | astro-ph | null | X-ray emission due to inverse-Compton scattering of microwave background
photons by electrons in the lobes of powerful radio galaxies has now been seen
in a large number of objects. Combining an inverse-Compton model for the lobe
X-ray emission with information obtained from radio synchrotron emission
provides a method of constraining the electron population and magnetic field
energy density, which cannot be accomplished using the radio data alone. Using
six frequencies of new and archival radio data and new XMM-Newton observations
of the Fanaroff & Riley class II radio galaxy 3C353, we show that
inverse-Compton emission is detected in the radio lobes of this source at a
level consistent with what is seen in other objects. We argue that variations
in the X-ray/radio ratio in the brighter eastern lobe require positionally
varying magnetic field strength. We also examine the X-ray nucleus and the
cluster, Zw 1819.1-0108, spatially and spectrally.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:33:20 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Goodger",
"J. L.",
""
],
[
"Hardcastle",
"M. J.",
""
],
[
"Croston",
"J. H.",
""
],
[
"Kassim",
"N. E.",
""
],
[
"Perley",
"R. A.",
""
]
] | [
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] |
801.4316 | Paulo Cortes | P. C. Cortes, R. M. Crutcher, D. Shepherd, L. Bronfman | Interferometric Mapping of Magnetic Fields: The massive star forming
region G34.4+0.23 MM | Accepted to be published at ApJ | null | 10.1086/524355 | null | astro-ph | null | We report millimeter interferometric observations of polarized continuum and
line emission from the massive star forming region G34.4. Polarized thermal
dust emission at 3 mm wavelength and CO $J=1 \to 0$ line emission were observed
using the Berkeley-Illinois-Maryland Association (BIMA) array. Our results show
a remarkably uniform polarization pattern in both dust and in CO J=$1 \to 0$
emission. In addition, the line emission presents a consistent uniform
polarization pattern over most of the velocity channel maps. These uniform
polarization patterns are aligned with the north-south main axis of the
filament between the main millimeter source (MM) and the ultra-compact H
{\scriptsize II} region, which are the central sources in G34.4, suggesting a
magnetic field orthogonal to this axis. This morphology is consistent with a
magnetically supported disk seen roughly edge-on.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:45:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cortes",
"P. C.",
""
],
[
"Crutcher",
"R. M.",
""
],
[
"Shepherd",
"D.",
""
],
[
"Bronfman",
"L.",
""
]
] | [
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] |
801.4317 | Sebastian Soberski SS | Sebastian Soberski, Eugeniusz Pazderski, Andrzej Kus | New 6-cm observations of a large sample of radio SNRs | 3 pages, 4 figures, proceedings for "Supernova 1987A: 20 Years After:
Supernovae and Gamma-Ray Bursters" AIP, New York, eds. S. Immler, K.W.
Weiler, and R. McCray | AIP Conf.Proc.937:272,2007 | 10.1063/1.2803575 | null | astro-ph | null | Almost 50 radio SNR objects were selected from Green's catalogue for
continuum and polarization observations. We present preliminary results of this
observational campaign at 4.7 GHz carried out with Torun 32-metre radio
telescope.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:13:04 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Soberski",
"Sebastian",
""
],
[
"Pazderski",
"Eugeniusz",
""
],
[
"Kus",
"Andrzej",
""
]
] | [
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] |
801.4318 | William Knafo | W. Knafo, C. Meingast, A. Inaba, Th. Wolf, and H. v. L\"ohneysen | Heat Capacity and Magnetic Phase Diagram of the Low-Dimensional
Antiferromagnet Y$_2$BaCuO$_5$ | 14 pages, 7 figures | J. Phys.: Condens. Matter 20, 335208 (2008) | 10.1088/0953-8984/20/33/335208 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A study by specific heat of a polycrystalline sample of the low-dimensional
magnetic system Y$_2$BaCuO$_5$ is presented. Magnetic fields up to 14 T are
applied and permit to extract the ($T$,$H$) phase diagram. Below
$\mu_0H^*\simeq2$ T, the N\'eel temperature, associated with a
three-dimensional antiferromagnetic long-range ordering, is constant and equals
$T_N=15.6$ K. Above $H^*$, $T_N$ increases linearly with $H$ and a
field-induced increase of the entropy at $T_N$ is related to the presence of an
isosbestic point at $T_X\simeq20$ K, where all the specific heat curves cross.
A comparison is made between Y$_2$BaCuO$_5$ and the quasi-two-dimensional
magnetic systems BaNi$_{2}$V$_{2}$O$_{8}$, Sr$_2$CuO$_2$Cl$_2$, and
Pr$_2$CuO$_4$, for which very similar phase diagrams have been reported. An
effective field-induced magnetic anisotropy is proposed to explain these phase
diagrams.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:49:52 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jul 2008 09:37:29 GMT"
}
] | 2008-07-28T00:00:00 | [
[
"Knafo",
"W.",
""
],
[
"Meingast",
"C.",
""
],
[
"Inaba",
"A.",
""
],
[
"Wolf",
"Th.",
""
],
[
"Löhneysen",
"H. v.",
""
]
] | [
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] |
801.4319 | Takanori Sakamoto | T. Sakamoto, D. Hullinger, G. Sato, R. Yamazaki, L. Barbier, S. D.
Barthelmy, J. R. Cummings, E. E. Fenimore, N. Gehrels, H. A. Krimm, D. Q.
Lamb, C. B. Markwardt, J. P. Osborne, D. M. Palmer, A. M. Parsons, M.
Stamatikos, J. Tueller | Global Properties of X-Ray Flashes and X-Ray-Rich Gamma-Ray Bursts
Observed by Swift | 50 pages, 22 figures, Accepted for publication in ApJ | null | 10.1086/586884 | null | astro-ph | null | We describe and discuss the spectral and temporal characteristics of the
prompt emission and X-ray afterglow emission of X-ray flashes (XRFs) and
X-ray-rich gamma-ray bursts (XRRs) detected and observed by Swift between
December 2004 and September 2006. We compare these characteristics to a sample
of conventional classical gamma-ray bursts (C-GRBs) observed during the same
period. We confirm the correlation between Epeak_obs and fluence noted by
others and find further evidence that XRFs, XRRs and C-GRBs form a continuum.
We also confirm that our known redshift sample is consistent with the
correlation between the peak energy in the GRB rest frame (Epeak_src) and the
isotropic radiated energy (Eiso), so called the Epeak_src-Eiso relation. The
spectral properties of X-ray afterglows of XRFs and C-GRBs are similar, but the
temporal properties of XRFs and C-GRBs are quite different. We found that the
light curves of C-GRB afterglows show a break to steeper indices
(shallow-to-steep break) at much earlier times than do XRF afterglows.
Moreover, the overall luminosity of XRF X-ray afterglows is systematically
smaller by a factor of two or more compared to that of C-GRBs. These distinct
differences between the X-ray afterglows of XRFs and C-GRBs may be the key to
understanding not only the mysterious shallow-to-steep break in X-ray afterglow
light curves, but also the unique nature of XRFs.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 15:51:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sakamoto",
"T.",
""
],
[
"Hullinger",
"D.",
""
],
[
"Sato",
"G.",
""
],
[
"Yamazaki",
"R.",
""
],
[
"Barbier",
"L.",
""
],
[
"Barthelmy",
"S. D.",
""
],
[
"Cummings",
"J. R.",
""
],
[
"Fenimore",
"E. E.",
""
],
[
"Gehrels",
"N.",
""
],
[
"Krimm",
"H. A.",
""
],
[
"Lamb",
"D. Q.",
""
],
[
"Markwardt",
"C. B.",
""
],
[
"Osborne",
"J. P.",
""
],
[
"Palmer",
"D. M.",
""
],
[
"Parsons",
"A. M.",
""
],
[
"Stamatikos",
"M.",
""
],
[
"Tueller",
"J.",
""
]
] | [
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801.432 | Barlet Daniel | Daniel Barlet | Two finiteness theorem for $(a,b)$-module | null | null | null | null | math.AG math.CV | null | We prove the following two results
1. For a proper holomorphic function $ f : X \to D$ of a complex manifold
$X$ on a disc such that $\{df = 0 \} \subset f^{-1}(0)$, we construct, in a
functorial way, for each integer $p$, a geometric (a,b)-module $E^p$ \
associated to the (filtered) Gauss-Manin connexion of $f$.
This first theorem is an existence/finiteness result which shows that
geometric (a,b)-modules may be used in global situations.
2. For any regular (a,b)-module $E$ we give an integer $N(E)$, explicitely
given from simple invariants of $E$, such that the isomorphism class of
$E\big/b^{N(E)}.E$ determines the isomorphism class of $E$.
This second result allows to cut asymptotic expansions (in powers of $b$) \
of elements of $E$ without loosing any information.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:03:23 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Barlet",
"Daniel",
""
]
] | [
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] |
801.4321 | Abdelhak Djouadi | A. Djouadi, M. Drees, U. Ellwanger, R. Godbole, C. Hugonie, S.F. King,
S. Lehti, S. Moretti, A. Nikitenko, I. Rottlaender, M. Schumacher, A.
Teixeira | Benchmark scenarios for the NMSSM | 25 pages, 2 figures, 2 tables | JHEP 0807:002,2008 | 10.1088/1126-6708/2008/07/002 | LPT-Orsay 07-135, SHEP-07-46 | hep-ph | null | We discuss constrained and semi--constrained versions of the
next--to--minimal supersymmetric extension of the Standard Model (NMSSM) in
which a singlet Higgs superfield is added to the two doublet superfields that
are present in the minimal extension (MSSM). This leads to a richer Higgs and
neutralino spectrum and allows for many interesting phenomena that are not
present in the MSSM. In particular, light Higgs particles are still allowed by
current constraints and could appear as decay products of the heavier Higgs
states, rendering their search rather difficult at the LHC. We propose
benchmark scenarios which address the new phenomenological features, consistent
with present constraints from colliders and with the dark matter relic density,
and with (semi--)universal soft terms at the GUT scale. We present the
corresponding spectra for the Higgs particles, their couplings to gauge bosons
and fermions and their most important decay branching ratios. A brief survey of
the search strategies for these states at the LHC is given.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:03:42 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Djouadi",
"A.",
""
],
[
"Drees",
"M.",
""
],
[
"Ellwanger",
"U.",
""
],
[
"Godbole",
"R.",
""
],
[
"Hugonie",
"C.",
""
],
[
"King",
"S. F.",
""
],
[
"Lehti",
"S.",
""
],
[
"Moretti",
"S.",
""
],
[
"Nikitenko",
"A.",
""
],
[
"Rottlaender",
"I.",
""
],
[
"Schumacher",
"M.",
""
],
[
"Teixeira",
"A.",
""
]
] | [
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] |
801.4322 | William Matthews | William Matthews, Andreas Winter | Pure-state transformations and catalysis under operations that
completely preserve positivity of partial transpose | 12 pages, 2 figures. v2: Journal version; Typos fixed | Phys. Rev. A 78, 012317 (2008) | 10.1103/PhysRevA.78.012317 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the desire to better understand the class of quantum operations
on bipartite systems that preserve positivity of partial transpose (PPT
operations) and its relation to the class LOCC (local operations and classical
communication), we present some results on deterministic bipartite pure state
transformations by PPT operations. Restricting our attention to the case where
we start with a rank K maximally entangled state, we give a necessary condition
for transforming it into a given pure state, which we show is also sufficient
when K is two and the final state has Schmidt rank three. We show that it is
sufficient for all K and all final states provided a conjecture about a certain
family of semidefinite programs is true. We also demonstrate that the
phenomenon of catalysis can occur under PPT operations and that, unlike LOCC
catalysis, a maximally entangled state can be a catalyst. Finally, we give a
necessary and sufficient condition for the possibility of transforming a rank K
maximally entangled state to an arbitrary pure state by PPT operations assisted
by some maximally entangled catalyst.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:05:22 GMT"
},
{
"version": "v2",
"created": "Sun, 26 Oct 2008 13:55:25 GMT"
}
] | 2008-10-26T00:00:00 | [
[
"Matthews",
"William",
""
],
[
"Winter",
"Andreas",
""
]
] | [
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] |
801.4323 | Nicholas d'Ambrumenil | Y.B. Sherkunov, A. Pratap, B. Muzykantskii, N. d'Ambrumenil | Full Counting Statistics as the Geometry of Two Planes | 4 pages, 1 figure | Phys. Rev. Lett. 100, 196601 (2008) | 10.1103/PhysRevLett.100.196601 | null | cond-mat.mes-hall | null | Provided the measuring time is short enough, the full counting statistics
(FCS) of the charge pumped across a barrier as a result of a series of voltage
pulses are shown to be equivalent to the geometry of two planes. This
formulation leads to the FCS without the need for the usual non-equilibrium
(Keldysh) transport theory or the direct computation of the determinant of an
infinite-dimensional matrix. In the particular case of the application of N
Lorentzian pulses, we show the computation of the FCS reduces to the
diagonalization of an N x N matrix. We also use the formulation to compute the
core-hole response in the X-ray edge problem and the FCS for a square wave
pulse-train for the case of low transmission.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:05:52 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 08:28:33 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Mar 2008 11:47:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sherkunov",
"Y. B.",
""
],
[
"Pratap",
"A.",
""
],
[
"Muzykantskii",
"B.",
""
],
[
"d'Ambrumenil",
"N.",
""
]
] | [
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] |
801.4324 | Daniel Arteaga | Daniel Arteaga | Quasiparticle excitations in relativistic quantum field theory | 53 pages, 4 figures. Version accepted for publication in Ann. Phys | Annals Phys.324:920-954,2009 | 10.1016/j.aop.2008.12.002 | null | hep-ph cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the particle-like excitations arising in relativistic field
theories in states different than the vacuum. The basic properties
characterizing the quasiparticle propagation are studied using two different
complementary methods. First we introduce a frequency-based approach, wherein
the quasiparticle properties are deduced from the spectral analysis of the
two-point propagators. Second, we put forward a real-time approach, wherein the
quantum state corresponding to the quasiparticle excitation is explicitly
constructed, and the time-evolution is followed. Both methods lead to the same
result: the energy and decay rate of the quasiparticles are determined by the
real and imaginary parts of the retarded self-energy respectively. Both
approaches are compared, on the one hand, with the standard field-theoretic
analysis of particles in the vacuum and, on the other hand, with the
mean-field-based techniques in general backgrounds.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:21:14 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Dec 2008 11:40:42 GMT"
}
] | 2010-11-23T00:00:00 | [
[
"Arteaga",
"Daniel",
""
]
] | [
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] |
801.4325 | Dong Xu | Dong Xu, Yuan-Chuan Zou, Yi-Zhong Fan | Mildly relativistic X-ray transient 080109 and SN2008D: Towards a
continuum from energetic GRB/XRF to ordinary Ibc SN | 4 pages, 2 figures | null | null | null | astro-ph | null | We analyze the hitherto available space-based X-ray data as well as
ground-based optical data of the X-ray transient 080109/SN2008D. From the data
we suggest that (i) The initial transient (\lesssim 800 sec) is attributed to
the reverse shock emission of a mildly relativistic (\Gamma \sim a few) outflow
stalled by the dense stellar wind. (ii) The subsequent X-ray afterglow
(\lesssim 2\times 10^4 sec) can be ascribed to the forward shock emission of
the outflow, with a kinetic energy \sim 10^{46} erg, when sweeping up the
stellar wind medium. (iii) The late X-ray flattening (\gtrsim 2\times 10^4$
sec) is powered by the fastest non-decelerated component of SN2008D's ejecta.
(iv) The local event rate of X-ray transient has a lower limit of \sim
1.6\times 10^4 yr^{-1} Gpc^{-3}, indicating a vast majority of X-ray transients
have a wide opening angle of \gtrsim 100 degree. The off-axis viewing model is
less likely. (v) Transient 080109/SN2008D may lead to a continuum from GRB-SN
to under-luminous GRB-/XRF-SN to X-ray transient-SN and to ordinary Ibc SN (if
not every Ibc SN has a relativistic jet), as shown in Figure 2 of this Letter.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 20:47:16 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 00:56:53 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Xu",
"Dong",
""
],
[
"Zou",
"Yuan-Chuan",
""
],
[
"Fan",
"Yi-Zhong",
""
]
] | [
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] |
801.4326 | Bahlali Seid | Seid Bahlali | A general stochastic maximum principle for optimal control problems of
forward-backward systems | 33 pages | null | null | null | math.PR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stochastic maximum principle of nonlinear controlled forward-backward
systems, where the set of strict (classical) controls need not be convex and
the diffusion coefficient depends explicitly on the variable control, is an
open problem impossible to solve by the classical method of spike variation. In
this paper, we introduce a new approach to solve this open problem and we
establish necessary as well as sufficient conditions of optimality, in the form
of global stochastic maximum principle, for two models. The first concerns the
relaxed controls, who are a measure-valued processes. The second is a
restriction of the first to strict control problems.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:24:05 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 10:03:47 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Jul 2008 13:10:59 GMT"
},
{
"version": "v4",
"created": "Thu, 28 Aug 2008 14:23:56 GMT"
},
{
"version": "v5",
"created": "Sat, 30 Aug 2008 15:07:10 GMT"
},
{
"version": "v6",
"created": "Sat, 20 Dec 2008 14:11:14 GMT"
}
] | 2008-12-20T00:00:00 | [
[
"Bahlali",
"Seid",
""
]
] | [
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801.4327 | Vieri Mastropietro | Vieri Mastropietro | Luttinger liquid fixed point for a 2D flat Fermi surface | null | null | 10.1103/PhysRevB.77.195106 | null | cond-mat.str-el | null | We consider a system of 2D interacting fermions with a flat Fermi surface.
The apparent conflict between Luttinger and non Luttinger liquid behavior found
through different approximations is resolved by showing the existence of a line
of non trivial fixed points, for the RG flow, corresponding to Luttinger liquid
behavior; the presence of marginally relevant operators can cause flow away
from the fixed point. The analysis is non-perturbative and based on the
implementation, at each RG iteration, of Ward Identities obtained from local
phase transformations depending on the Fermi surface side, implying the partial
vanishing of the Beta function.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:24:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mastropietro",
"Vieri",
""
]
] | [
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] |
801.4328 | Thomas Rivinius | Th. Rivinius (1), S. Stefl (1), R.H.D. Townsend (2), D. Baade (3) ((1)
ESO - Chile, (2) Bartol Research Institute, University of Delaware, (3) ESO -
Garching) | The most rapidly rotating He-strong emission line star: HR7355 | 4 pages with 2 figures. Accepted for publication as Research Note by
Astronomy and Astrophysics | null | 10.1051/0004-6361:20078547 | null | astro-ph | null | Using archival spectroscopic and photometric data, we searched for massive
stars with Balmer-emission consistent with magnetically confined circumstellar
material. HR 7355 is a formerly unknown He-strong star showing Balmer emission.
At V=6.02 mag, it is one of the brightest objects simultaneously showing
anomalous helium absorption and hydrogen emission. Among similar objects, only
sigma Ori E has so far been subjected to any systematic analysis of the
circumstellar material responsible for the emission. We argue that the
double-wave photometric period of 0.52d corresponds to the rotation period. In
tandem with the high projected equatorial velocity, v sin i=320 km/s, this
short period suggests that HR 7355 is the most rapidly rotating He-strong star
known to date; a class that was hitherto expected to host stars with slow to
moderate rotation only.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:46:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rivinius",
"Th.",
""
],
[
"Stefl",
"S.",
""
],
[
"Townsend",
"R. H. D.",
""
],
[
"Baade",
"D.",
""
]
] | [
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] |
801.4329 | Francois Roueff | Gilles Fay (LPP), Eric Moulines (LTCI), Fran\c{c}ois Roueff (LTCI),
Murad S. Taqqu (BOSTON University) | Estimators of Long-Memory: Fourier versus Wavelets | null | null | null | null | math.ST stat.TH | null | There have been a number of papers written on semi-parametric estimation
methods of the long-memory exponent of a time series, some applied, others
theoretical. Some using Fourier methods, others using a wavelet-based
technique. In this paper, we compare the Fourier and wavelet approaches to the
local regression method and to the local Whittle method. We provide an overview
of these methods, describe what has been done, indicate the available results
and the conditions under which they hold. We discuss their relative strengths
and weaknesses both from a practical and a theoretical perspective. We also
include a simulation-based comparison. The software written to support this
work is available on demand and we illustrate its use at the end of the paper.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:43:54 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Fay",
"Gilles",
"",
"LPP"
],
[
"Moulines",
"Eric",
"",
"LTCI"
],
[
"Roueff",
"François",
"",
"LTCI"
],
[
"Taqqu",
"Murad S.",
"",
"BOSTON University"
]
] | [
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] |
801.433 | Shung-ichi Ando | S. Ando (1 and 2), J.W. Shin (1), C.H. Hyun (3), S.W. Hong (1), and K.
Kubodera (4) ((1) Sungkyunkwan U., (2) U. of Manchester, (3) Daegu U., (4) U.
of South Carolina) | Proton-proton fusion in pionless effective theory | 14 pages, 5 eps figures | Phys.Lett.B668:187-192,2008 | 10.1016/j.physletb.2008.08.040 | null | nucl-th astro-ph hep-ph | null | The proton-proton fusion reaction, $pp\to de^+\nu$, is studied in pionless
effective field theory (EFT) with di-baryon fields up to next-to leading order.
With the aid of the di-baryon fields, the effective range corrections are
naturally resummed up to the infinite order and thus the calculation is greatly
simplified. Furthermore, the low-energy constant which appears in the
axial-current-di-baryon-di-baryon contact vertex is fixed through the ratio of
two- and one-body matrix elements which reproduces the tritium lifetime very
precisely. As a result we can perform a parameter free calculation for the
process. We compare our numerical result with those from the accurate potential
model and previous pionless EFT calculations, and find a good agreement within
the accuracy better than 1%.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:44:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ando",
"S.",
"",
"1 and 2"
],
[
"Shin",
"J. W.",
""
],
[
"Hyun",
"C. H.",
""
],
[
"Hong",
"S. W.",
""
],
[
"Kubodera",
"K.",
""
]
] | [
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] |
801.4331 | Elisabetta Paladino | E. Paladino, A. G. Maugeri, M. Sassetti, G. Falci and U. Weiss | Structured environments in solid state systems: crossover from Gaussian
to non-Gaussian behavior | 8 pages, 9 figures. Proceedings of the DECONS '06 Conference | Physica E 40, 198 - 205 (2007) | 10.1016/j.physe.2007.05.002 | null | cond-mat.mes-hall | null | The variety of noise sources typical of the solid state represents the main
limitation toward the realization of controllable and reliable quantum
nanocircuits, as those allowing quantum computation. Such ``structured
environments'' are characterized by a non-monotonous noise spectrum sometimes
showing resonances at selected frequencies. Here we focus on a prototype
structured environment model: a two-state impurity linearly coupled to a
dissipative harmonic bath. We identify the time scale separating Gaussian and
non-Gaussian dynamical regimes of the Spin-Boson impurity. By using a
path-integral approach we show that a qubit interacting with such a structured
bath may probe the variety of environmental dynamical regimes.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:53:02 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Paladino",
"E.",
""
],
[
"Maugeri",
"A. G.",
""
],
[
"Sassetti",
"M.",
""
],
[
"Falci",
"G.",
""
],
[
"Weiss",
"U.",
""
]
] | [
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] |
801.4332 | Delfim F. M. Torres | Moulay Rchid Sidi Ammi, Delfim F. M. Torres | Necessary Optimality Condition for a Discrete Dead Oil Isotherm Optimal
Control Problem | Proc. Workshop on Mathematical Control Theory and Finance, Lisbon,
10-14 April 2007, pp. 501--507 | Mathematical Control Theory and Finance, Springer, 2008, pp.
387--395 | 10.1007/978-3-540-69532-5_22 | null | math.OC math.AP | null | We obtain necessary optimality conditions for a semi-discretized optimal
control problem for the classical system of nonlinear partial differential
equations modelling the water-oil (isothermal dead-oil model).
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:56:31 GMT"
}
] | 2009-08-13T00:00:00 | [
[
"Ammi",
"Moulay Rchid Sidi",
""
],
[
"Torres",
"Delfim F. M.",
""
]
] | [
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] |
801.4333 | Istvan Kezsmarki | I. Kezsmarki and S. Bordacs | New type of ellipsometry in infrared spectroscopy: The double-reference
method | submitted to Appl. Phys. Lett | APPLIED PHYSICS LETTERS 92, 131104 (2008) | 10.1063/1.2904623 | null | physics.optics | null | We have developed a conceptually new type of ellipsometry which allows the
determination of the complex refractive index by simultaneously measuring the
unpolarized normal-incidence reflectivity relative to the vacuum and to another
reference media. From these two quantities the complex optical response can be
directly obtained without Kramers-Kronig transformation. Due to its
transparency and large refractive index over a broad range of the spectrum,
from the far-infrared to the soft ultraviolet region, diamond can be ideally
used as a second reference. The experimental arrangement is rather simple
compared to other ellipsometric techniques.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 16:57:54 GMT"
}
] | 2014-01-15T00:00:00 | [
[
"Kezsmarki",
"I.",
""
],
[
"Bordacs",
"S.",
""
]
] | [
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] |
801.4334 | Gandhimohan M. Viswanathan | J. S. Agnaldo, J. C. Cressoni, G. M. Viswanathan | Universal photocurrent-voltage characteristics of dye sensitized
nanocrystalline TiO$_2$ photoelectrochemical cells | 5 pages, 3 figs | null | 10.1103/PhysRevB.79.035308 | null | cond-mat.other | null | We propose a new linearizable model for the nonlinear photocurrent-voltage
characteristics of nanocrystalline TiO$_2$ dye sensitized solar cells based on
first principles and report predicted values for fill factors. Upon
renormalization diverse experimental photocurrent-voltage data collapse onto a
single universal function. These advances allow the estimation of the complete
current-voltage curve and the fill factor from any three experimental data
points, e.g., the open circuit voltage, the short circuit current and one
intermediate measurement. The theoretical underpinning provides insight into
the physical mechanisms responsible for the remarkably large fill factors as
well as their known dependence on the open circuit voltage.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:28:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Agnaldo",
"J. S.",
""
],
[
"Cressoni",
"J. C.",
""
],
[
"Viswanathan",
"G. M.",
""
]
] | [
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] |
801.4335 | Sara Caucci | S. Caucci, S. Colombi, C. Pichon, E. Rollinde, P. Petitjean, T.
Sousbie | Recovering the topology of the IGM at z~2 | 20 pages, 18 figures, accepted for publication in MNRAS | null | null | null | astro-ph | null | We investigate how well the 3D density field of neutral hydrogen in the
Intergalactic Medium (IGM) can be reconstructed using the Lyman-alpha
absorptions observed along lines of sight to quasars separated by arcmin
distances in projection on the sky. We use cosmological hydrodynamical
simulations to compare the topologies of different fields: dark matter, gas and
neutral hydrogen optical depth and to investigate how well the topology of the
IGM can be recovered from the Wiener interpolation method implemented by Pichon
et al. (2001). The global statistical and topological properties of the
recovered field are analyzed quantitatively through the power-spectrum, the
probability distribution function (PDF), the Euler characteristics, its
associated critical point counts and the filling factor of underdense regions.
The local geometrical properties of the field are analysed using the local
skeleton by defining the concept of inter-skeleton distance. At scales larger
than ~1.4 <d_LOS>, where <d_LOS> is the mean separation between lines of sight,
the reconstruction accurately recovers the topological features of the large
scale density distribution of the gas, in particular the filamentary
structures. At scales larger than the intrinsic smoothing length of the
inversion procedure, the power spectrum of the recovered HI density field
matches well that of the original one and the low order moments of the PDF are
well recovered as well as the shape of the Euler characteristic. The integral
errors on the PDF and the critical point counts are indeed small, less than 20%
for <d_LOS>~2.5 arcmin. The small deviations between the reconstruction and the
exact solution mainly reflect departures from the log-normal behaviour that are
ascribed to highly non-linear objects in overdense regions.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:16:01 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Caucci",
"S.",
""
],
[
"Colombi",
"S.",
""
],
[
"Pichon",
"C.",
""
],
[
"Rollinde",
"E.",
""
],
[
"Petitjean",
"P.",
""
],
[
"Sousbie",
"T.",
""
]
] | [
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] |
801.4336 | Gennady Shmonin | Friedrich Eisenbrand, Gennady Shmonin | Parametric Integer Programming in Fixed Dimension | 23 pages, 3 figures | null | null | null | math.OC | null | We consider the following problem: Given a rational matrix $A \in \setQ^{m
\times n}$ and a rational polyhedron $Q \subseteq\setR^{m+p}$, decide if for
all vectors $b \in \setR^m$, for which there exists an integral $z \in \setZ^p$
such that $(b, z) \in Q$, the system of linear inequalities $A x \leq b$ has an
integral solution. We show that there exists an algorithm that solves this
problem in polynomial time if $p$ and $n$ are fixed. This extends a result of
Kannan (1990) who established such an algorithm for the case when, in addition
to $p$ and $n$, the affine dimension of $Q$ is fixed.
As an application of this result, we describe an algorithm to find the
maximum difference between the optimum values of an integer program $\max \{c x
: A x \leq b, x \in \setZ^n \}$ and its linear programming relaxation over all
right-hand sides $b$, for which the integer program is feasible. The algorithm
is polynomial if $n$ is fixed. This is an extension of a recent result of
Ho\c{s}ten and Sturmfels (2003) who presented such an algorithm for integer
programs in standard form.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:35:16 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Eisenbrand",
"Friedrich",
""
],
[
"Shmonin",
"Gennady",
""
]
] | [
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] |
801.4337 | Dietrich Stauffer | G. Weisbuch, D. Stauffer, D. Mangalagiu, R. Ben-Av, S. Solomon | Emergence of firms in $(d+1)$-dimensional work space | 13 pages including all figures | null | null | null | q-fin.GN physics.soc-ph | null | Standard micro-economics concentrate on the description of markets but is
seldom interested in production. Several economists discussed the concept of a
firm, as opposed to an open labour market where entrepreneurs would recrute
workers on the occasion of each business opportunity. Coase \cite{Coase} is one
of them, who explains the existence of firms as institution because they reduce
the transaction costs with respect to an open labour market. Whatever the
rationale proposed by economists to account for the existence of firms, their
perspective is based on efficiency and cost analysis. Little attention is paid
to the dynamics of emergence and evolution of firms. The aim of the present
manuscript is to check the global dynamical properties of a very simple model
based on bounded rationality and reinforcement learning.
Workers and managers are localised on a lattice and they choose collaborators
on the basis of the success of previous work relations. The choice algorithm is
largely inspired rom the observation and modeling of long term customer/sellers
relationships observed on perishable goods markets discussed in Weisbuch
etal\cite{Weisbuch} and Nadal etal\cite{Nadal}. The model presented here is in
no way an alternative to Coase. We describe the build-up of long term
relationships which do reduce transaction costs, and we deduce the dynamical
properties of networks built from our simple assumptions.
In conclusion, the present model explains the metastability of employment
relations in the firm, but something has to be added to it to explain the more
efficient workload repartition observed in real firms.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:10:09 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Weisbuch",
"G.",
""
],
[
"Stauffer",
"D.",
""
],
[
"Mangalagiu",
"D.",
""
],
[
"Ben-Av",
"R.",
""
],
[
"Solomon",
"S.",
""
]
] | [
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801.4338 | Dadina Mauro Dr | Mauro Dadina | Seyfert galaxies in the local Universe (z$\leq$ 0.1): the average X-ray
spectrum as seen by $BeppoSAX$ | accepted for publication on A&A | null | 10.1051/0004-6361:20077569 | null | astro-ph | null | The $BeppoSAX$ archive is currently the largest reservoir of high sensitivity
simultaneous soft and hard-X ray data of Seyfert galaxies. From this database
all the Seyfert galaxies (105 objects of which 43 are type I and 62 are type
II) with redshift lower than 0.1 have been selected and analyzed in a
homogeneous way (Dadina 2007). The X-ray data so collected allow to infer the
average spectral properties of nearby Seyfert galaxies included in the original
sample and, most notably: the photon index ($\Gamma$$\sim$1.8), the high-energy
cut-off (Ec$\sim$290 keV), and the relative amount of reflection (R$\sim$1.0).
The data have been also used to test some assumptions of the unified scheme for
the AGN. The distributions of the isotropic indicators (photon index, relative
amount of reflection, high-energy cut-off and narrow FeK$\alpha$ energy
centroid) are similar in type I and type II objects while the absorbing column
and the iron line equivalent width significantly differ between the two classes
of active galactic nuclei. Confirming previous results, the narrow FeK$\alpha$
line is consistent, in Seyfert 2, with being produced in the same matter
responsible for the observed obscuration. These results, thus, support the
basic picture of the unified model. Moreover, the presence of a X-ray Baldwin
effect in Seyfert 1 has been here measured using the 20-100 keV luminosity
(EW$\propto$L(20-100)$^{-0.22\pm0.05}$). Finally, the possible presence of a
correlation between the photon index and the amount of reflection is confirmed
thus indicating thermal Comptonization as the most likely origin of the high
energy emission for the active galactic nuclei included in the original sample.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:19:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dadina",
"Mauro",
""
]
] | [
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801.4339 | Charmousis | Luca Amendola, Christos Charmousis and Stephen C. Davis | Mimicking general relativity in the solar system | published PRD version | Phys.Rev.D78:084009,2008 | 10.1103/PhysRevD.78.084009 | LPT 08-15 | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order for a modified gravity model to be a candidate for cosmological dark
energy it has to pass stringent local gravity experiments. We find that a
Brans-Dicke (BD) theory with well-defined second order corrections that include
the Gauss-Bonnet term possess this feature. We construct the generic second
order theory that gives, to linear order, a BD metric solution for a point-like
mass source. We find that these theories interpolate between general relativity
(GR) and BD gravity. In particular it is found that the relevant Eddington
parameter, that is commonly heavily constrained by time delay experiments, can
be arbitrarily close to the GR value of 1, with an arbitrary BD parameter. We
find the region where the solution is stable to small timelike perturbations.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:32:24 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Oct 2008 02:04:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Amendola",
"Luca",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Davis",
"Stephen C.",
""
]
] | [
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] |
801.434 | Dadina Mauro Dr | Mauro Dadina | The Seyfert galaxies in the local Universe: from BeppoSAX to Simbol-X | 4 pages, to appear in proceedings of "Simbol-X: the hard X-ray
Universe in focus", held in Bologna (Italy), May 14-16, 2007 | null | null | null | astro-ph | null | The operational conditions found by $BeppoSAX$ in observing nearby
(z$\leq$0.1) Seyferts were reproduced for $Simbol$-$X$ in order to simulate a
realistic final database of the mission. The results indicate that, even in the
worst conditions, the $Simbol$-$X$ archive of pointings will allow to fully
characterize the high-energy spectrum of nearby Seyferts and, most importantly,
to obtain solid results on R and Ec (fundamental to model the cosmic X-Ray
background, CXB). The measurement of the inclination angle of the accretion
disk will be possible for $\sim$15 objects allowing to directly test the
unified models for AGN. Finally, the time-dependent characteristics of the
reflected component will be studied in at least $\sim$25 objects.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:36:36 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Dadina",
"Mauro",
""
]
] | [
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801.4341 | Rosane Riera Freire | L. Gazola, C. Fernandes, A. Pizzinga and R. Riera | The log-periodic-AR(1)-GARCH(1,1) model for financial crashes | 17 pages, 4 figures, 12 tables, to appear in Europen Physical Journal
B | null | 10.1140/epjb/e2008-00085-1 | null | q-fin.ST physics.data-an physics.soc-ph | null | This paper intends to meet recent claims for the attainment of more rigorous
statistical methodology within the econophysics literature. To this end, we
consider an econometric approach to investigate the outcomes of the
log-periodic model of price movements, which has been largely used to forecast
financial crashes. In order to accomplish reliable statistical inference for
unknown parameters, we incorporate an autoregressive dynamic and a conditional
heteroskedasticity structure in the error term of the original model, yielding
the log-periodic-AR(1)-GARCH(1,1) model. Both the original and the extended
models are fitted to financial indices of U. S. market, namely S&P500 and
NASDAQ. Our analysis reveal two main points: (i) the
log-periodic-AR(1)-GARCH(1,1) model has residuals with better statistical
properties and (ii) the estimation of the parameter concerning the time of the
financial crash has been improved.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:47:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gazola",
"L.",
""
],
[
"Fernandes",
"C.",
""
],
[
"Pizzinga",
"A.",
""
],
[
"Riera",
"R.",
""
]
] | [
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801.4342 | Sushant Ghosh | S. G. Ghosh and A. K. Dawood | Radiating black hole solutions in arbitrary dimensions | RevTeX 9 pages, no figures | Gen.Rel.Grav.40:9-21,2008 | 10.1007/s10714-007-0511-6 | null | gr-qc | null | We prove a theorem that characterizes a large family of non-static solutions
to Einstein equations in $N$-dimensional space-time, representing, in general,
spherically symmetric Type II fluid. It is shown that the best known
Vaidya-based (radiating) black hole solutions to Einstein equations, in both
four dimensions (4D) and higher dimensions (HD), are particular cases from this
family. The spherically symmetric static black hole solutions for Type I fluid
can also be retrieved. A brief discussion on the energy conditions,
singularities and horizons is provided.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 17:59:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ghosh",
"S. G.",
""
],
[
"Dawood",
"A. K.",
""
]
] | [
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] |
801.4343 | Leonid Glozman | L. Ya. Glozman (Univ. Graz), A. V. Nefediev (ITEP, Moscow) | Chiral restoration in excited nucleons versus SU(6) | RevTeX, 14 pages, a few comments added and references updated, to
appear in Nucl. Phys. A | Nucl.Phys.A807:38-47,2008 | 10.1016/j.nuclphysa.2008.04.001 | null | hep-ph hep-lat nucl-th | null | We compare axial charges of excited nucleons, as predicted by the chiral
symmetry restoration picture, with the traditional, moderately successful for
the ground-state baryons SU(6) symmetry. The axial charges of excited nucleons
can (and will) be measured in lattice QCD simulations, and comparison of the
lattice results with the two different symmetry schemes will give an insight on
the origins of the excited hadron masses as well as on interrelations of chiral
symmetry and confinement.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:42:38 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 09:55:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Glozman",
"L. Ya.",
"",
"Univ. Graz"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] | [
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] |
801.4344 | Jun Ye | A. D. Ludlow, T. Zelevinsky, G. K. Campbell, S. Blatt, M. M. Boyd, M.
H. G. de Miranda, M. J. Martin, J. W. Thomsen, S. M. Foreman, and Jun Ye, T.
M. Fortier, J. E. Stalnaker, S. A. Diddams, Y. Le Coq, Z. W. Barber, N. Poli,
N. D. Lemke, K. M. Beck, and C. W. Oates | Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical
evaluation with a Ca clock | To be published in Science, 2008 | Science 319, 1805 (2008) | 10.1126/science.1153341 | null | physics.atom-ph physics.gen-ph | null | Optical atomic clocks promise timekeeping at the highest precision and
accuracy, owing to their high operating frequencies. Rigorous evaluations of
these clocks require direct comparisons between them. We have realized a
high-performance remote comparison of optical clocks over km-scale urban
distances, a key step for development, dissemination, and application of these
optical standards. Through this remote comparison and a proper design of
lattice-confined neutral atoms for clock operation, we evaluate the uncertainty
of a strontium (Sr) optical lattice clock at the 1x10-16 fractional level,
surpassing the best current evaluations of cesium (Cs) primary standards. We
also report on the observation of density-dependent effects in the
spin-polarized fermionic sample and discuss the current limiting effect of
blackbody radiation-induced frequency shifts.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:09:44 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Mar 2008 23:06:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ludlow",
"A. D.",
""
],
[
"Zelevinsky",
"T.",
""
],
[
"Campbell",
"G. K.",
""
],
[
"Blatt",
"S.",
""
],
[
"Boyd",
"M. M.",
""
],
[
"de Miranda",
"M. H. G.",
""
],
[
"Martin",
"M. J.",
""
],
[
"Thomsen",
"J. W.",
""
],
[
"Foreman",
"S. M.",
""
],
[
"Ye",
"Jun",
""
],
[
"Fortier",
"T. M.",
""
],
[
"Stalnaker",
"J. E.",
""
],
[
"Diddams",
"S. A.",
""
],
[
"Coq",
"Y. Le",
""
],
[
"Barber",
"Z. W.",
""
],
[
"Poli",
"N.",
""
],
[
"Lemke",
"N. D.",
""
],
[
"Beck",
"K. M.",
""
],
[
"Oates",
"C. W.",
""
]
] | [
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801.4345 | Joaquin Perez | William H. Meeks III, Joaquin Perez and Antonio Ros | Limit leaves of a CMC lamination are stable | 10 pages, 3 figures, replacement: minor changes in the introduction +
notation | null | null | null | math.DG | null | Suppose ${\cal L}$ is a lamination of a Riemannian manifold by hypersurfaces
with the same constant mean curvature. We prove that every limit leaf of ${\cal
L}$ is stable for the Jacobi operator. A simple but important consequence of
this result is that the set of stable leaves of ${\cal L}$ has the structure of
a lamination.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:10:09 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 10:55:42 GMT"
}
] | 2008-02-26T00:00:00 | [
[
"Meeks",
"William H.",
"III"
],
[
"Perez",
"Joaquin",
""
],
[
"Ros",
"Antonio",
""
]
] | [
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] |
801.4346 | Ayres Freitas | Ayres Freitas, Ulrich Haisch | Anti-B --> X(s) gamma in two universal extra dimensions | RevTeX4, 11pp | Phys.Rev.D77:093008,2008 | 10.1103/PhysRevD.77.093008 | ANL-HEP-PR-08-04; MZ-TH/08-03; ZU-TH-01-08 | hep-ph hep-ex | null | We calculate the leading order corrections to the anti-B --> X(s) gamma decay
in the standard model with two large flat universal extra dimensions. We find
that the contributions involving the exchange of Kaluza-Klein modes of the
physical scalar field a^+-_(kl) depend logarithmically on the ultraviolet
cut-off scale Lambda. We emphasize that all flavor-changing neutral current
transitions suffer from this problem. Although the ultraviolet sensitivity
weakens the lower bound on the inverse compactification radius 1/R that follows
from anti-B --> X(s) gamma, the constraint remains stronger than any other
available direct measurement. After performing a careful study of the potential
impact of cut-off and higher-order effects, we find 1/R > 650 GeV at 95%
confidence level if errors are combined in quadrature. Our limit is at variance
with the parameter region 1/R <~ 600 GeV preferred by dark matter constraints.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:22:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Freitas",
"Ayres",
""
],
[
"Haisch",
"Ulrich",
""
]
] | [
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] |
801.4347 | Sergio Scopetta | A. Courtoy, F. Fratini, S. Scopetta, V. Vento | A quark model analysis of the Sivers function | 31 pages, 4 figures. Extended version, discussion of the Burkardt Sum
Rule added, references added, minor changes in the numerical results, same
interpretation. Final version accepted for publication in Phys. Rev. D | Phys.Rev.D78:034002,2008 | 10.1103/PhysRevD.78.034002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a formalism to evaluate the Sivers function. The approach is well
suited for calculations which use constituent quark models to describe the
structure of the nucleon. A non-relativistic reduction of the scheme is
performed and applied to the Isgur-Karl model of hadron structure. The results
obtained are consistent with a sizable Sivers effect and the signs for the u
and d flavor contributions turn out to be opposite. This pattern is in
agreement with the one found analyzing, in the same model, the impact parameter
dependent generalized parton distributions. The Burkardt Sum Rule turns out to
be fulfilled to a large extent. We estimate the QCD evolution of our results
from the momentum scale of the model to the experimental one and obtain
reasonable agreement with the available data.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:28:18 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jul 2008 16:28:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Courtoy",
"A.",
""
],
[
"Fratini",
"F.",
""
],
[
"Scopetta",
"S.",
""
],
[
"Vento",
"V.",
""
]
] | [
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] |
801.4348 | Alexander Kashlinsky | A. Kashlinsky | Imprint of first stars era in the cosmic infrared backround fluctuations | Talk at IAU 250 "Massive stars as cosmic engines", Hawaii, Dec 2007 | null | 10.1017/S1743921308020851 | null | astro-ph | null | We present the latest results on CIB fluctuations from early epochs from deep
Spitzer data. The results show the existence of significant CIB fluctuations at
the IRAC wavelengths (3.6 to 8 mic) which remain after removing galaxies down
to very faint levels. These fluctuations must arise from populations with a
significant clustering component, but only low levels of the shot noise. There
are no correlations between the source-subtracted IRAC maps and the
corresponding fields observed with the HST ACS at optical wavelengths. Taken
together, these data imply that 1) the sources producing the CIB fluctuations
are individually faint with S_\nu< a few nJy at 3.6 and 4.5 mic; 2) have
different clustering pattern than the more recent galaxy populations; 3) are
located within the first 0.7 Gyr (unless these fluctuations can somehow be
produced by - so far unobserved - local galaxies of extremely low luminosity
and with the unusual for local populations clustering pattern), 4) produce
contribution to the net CIB flux of at least 1-2 nW/m^2/sr at 3.6 and 4.5 mic
and must have mass-to-light ratio significantly below the present-day
populations, and 5) they have angular density of ~ a few per arcsec^2 and are
in the confusion of the present day instruments, but can be individually
observable with JWST.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:29:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kashlinsky",
"A.",
""
]
] | [
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801.4349 | Alejandra Melfo | Borut Bajc and Alejandra Melfo | Metastable gauged O'Raifeartaigh | Typos corrected | JHEP0804:062,2008 | 10.1088/1126-6708/2008/04/062 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of obtaining metastable supersymmetry breaking vacua
in a perturbative gauge theory without singlet fields, thus allowing for
scenarios where a grand unified symmetry and supersymmetry are broken by the
same sector. We show some explicit SU(5) examples. The minimal renormalizable
example requires the use of two adjoints, but it is shown to inevitably lead to
unwanted light states. We suggest various alternatives, and show that the
viable possibilities consist of allowing for non-renormalizable operators, of
employing four adjoints or of adding at least one field in a different
representation.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:35:47 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 19:10:36 GMT"
},
{
"version": "v3",
"created": "Fri, 17 Oct 2008 22:29:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bajc",
"Borut",
""
],
[
"Melfo",
"Alejandra",
""
]
] | [
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] |
801.435 | Denis Laxalde | Denis Laxalde (LTDS), Fabrice Thouverez (LTDS), Jean-Jacques Sinou
(LTDS), Jean-Pierre Lombard | Qualitative Analysis of Forced Response of Blisks With Friction Ring
Dampers | null | European Journal of Mechanics - A/Solids / European Journal of
Mechanics - A/Solids 26, 4 (2007) 676-687 | 10.1016/j.euromechsol.2006.10.002 | null | physics.gen-ph | null | A damping strategy for blisks (integrally bladed disks) of turbomachinery
involving a friction ring is investigated. These rings, located in grooves
underside the wheel of the blisks, are held in contact by centrifugal loads and
the energy is dissipated when relative motions between the ring and the disk
occur. A representative lumped parameter model of the system is introduced and
the steady-state nonlinear response is derived using a multi-harmonic balance
method combined with an AFT procedure where the friction force is calculated in
the time domain. Numerical simulations are presented for several damper
characteristics and several excitation configurations. From these results, the
performance of this damping strategy is discussed and some design guidelines
are given.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:35:54 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Laxalde",
"Denis",
"",
"LTDS"
],
[
"Thouverez",
"Fabrice",
"",
"LTDS"
],
[
"Sinou",
"Jean-Jacques",
"",
"LTDS"
],
[
"Lombard",
"Jean-Pierre",
""
]
] | [
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-0.0105494522,
0.0287117567,
0.0215152316,
-0.0516543984,
-0.0291875601,
0.0606054477,
-0.0842766613,
-0.0358042009,
-0.0117240911,
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] |
801.4351 | Denis Laxalde | Denis Laxalde (LTDS), Fabrice Thouverez (LTDS), Jean-Jacques Sinou
(LTDS) | Dynamics of a linear oscillator connected to a small strongly non-linear
hysteretic absorber | null | International Journal of Non-Linear Mechanics 41, 8 (2006) 969-978 | 10.1016/j.ijnonlinmec.2006.09.002 | null | nlin.CD | null | The present investigation deals with the dynamics of a two-degrees-of-freedom
system which consists of a main linear oscillator and a strongly nonlinear
absorber with small mass. The nonlinear oscillator has a softening hysteretic
characteristic represented by a Bouc-Wen model. The periodic solutions of this
system are studied and their calcu- lation is performed through an averaging
procedure. The study of nonlinear modes and their stability shows, under
specific conditions, the existence of localization which is responsible for a
passive irreversible energy transfer from the linear oscillator to the
nonlinear one. The dissipative effect of the nonlinearity appears to play an
important role in the energy transfer phenomenon and some design criteria can
be drawn regarding this parameter among others to optimize this energy
transfer. The free transient response is investigated and it is shown that the
energy transfer appears when the energy input is sufficient in accordance with
the predictions from the nonlinear modes. Finally, the steady-state forced
response of the system is investigated. When the input of energy is sufficient,
the resonant response (close to nonlinear modes) experiences localization of
the vibrations in the nonlinear absorber and jump phenomena.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:36:29 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Laxalde",
"Denis",
"",
"LTDS"
],
[
"Thouverez",
"Fabrice",
"",
"LTDS"
],
[
"Sinou",
"Jean-Jacques",
"",
"LTDS"
]
] | [
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] |
801.4352 | Bernard Martinie | Bernard Martinie | Quantum Monte Carlo simulation of two-dimensional Emery model | null | null | null | null | cond-mat.str-el | null | The Quantum Monte Carlo simulation of the two-dimensional Emery model of the
CuO2 plane of hight Tc superconductors were performed. The method based on the
direct-space proposed by Suzuki and Hirsch was used. Contrary to the method
based on the Hubbard-Stratonovich transformation, the states generated by this
method are basis states in occupation number representation, i. e.
configurations of fermions can be observed on real two-dimensional array.Energy
and specific heat were computed for different dopings. Specific heat curves
show peaks at low temperature which could be assigned to electronic
transitions. Quantity similar to current-current correlation function were
computed. The static electric conductivity curves obtained by this way show
metal-insulator transitions and two different metallic behaviours. On the
direct-space states generated at low temperature and zero doping, the fermions
form antiferromagnetic loops while they form antiferromagnetic chains for other
dopings. The loops seem to appear when the conductivity becomes zero while yhe
conductivity increases with the numbers of chains but superconductivity is not
unambiguously evident.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:37:04 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Martinie",
"Bernard",
""
]
] | [
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] |
801.4353 | Bernard Amadon | B. Amadon, F. Lechermann, A. Georges, F. Jollet, T. O. Wehling and A.
I. Lichtenstein | Plane-wave based electronic structure calculations for correlated
materials using dynamical mean-field theory and projected local orbitals | 15 pages, 17 figures | null | 10.1103/PhysRevB.77.205112 | null | cond-mat.str-el cond-mat.mtrl-sci | null | The description of realistic strongly correlated systems has recently
advanced through the combination of density functional theory in the local
density approximation (LDA) and dynamical mean field theory (DMFT). This
LDA+DMFT method is able to treat both strongly correlated insulators and
metals. Several interfaces between LDA and DMFT have been used, such as (N-th
order) Linear Muffin Tin Orbitals or Maximally localized Wannier Functions.
Such schemes are however either complex in use or additional simplifications
are often performed (i.e., the atomic sphere approximation). We present an
alternative implementation of LDA+DMFT, which keeps the precision of the
Wannier implementation, but which is lighter. It relies on the projection of
localized orbitals onto a restricted set of Kohn-Sham states to define the
correlated subspace. The method is implemented within the Projector Augmented
Wave (PAW) and within the Mixed Basis Pseudopotential (MBPP) frameworks. This
opens the way to electronic structure calculations within LDA+DMFT for more
complex structures with the precision of an all-electron method. We present an
application to two correlated systems, namely SrVO3 and beta-NiS (a
charge-transfer material), including ligand states in the basis-set. The
results are compared to calculations done with Maximally Localized Wannier
functions, and the physical features appearing in the orbitally resolved
spectral functions are discussed.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:37:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amadon",
"B.",
""
],
[
"Lechermann",
"F.",
""
],
[
"Georges",
"A.",
""
],
[
"Jollet",
"F.",
""
],
[
"Wehling",
"T. O.",
""
],
[
"Lichtenstein",
"A. I.",
""
]
] | [
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801.4354 | Akikazu Hashimoto | Sheikh Shajidul Haque and Akikazu Hashimoto | Microscopic Formulation of Puff Field Theory | 12 pages, 3 figures | JHEP 0805:040,2008 | 10.1088/1126-6708/2008/05/040 | MAD-TH-08-03 | hep-th | null | We describe a generalization of Puff Field Theory to p+1 dimensions where 0
\le p \le 5. We then focus on the case of p=0, ``Puff Quantum Mechanics,'' and
construct a formulation independent of string theory.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:38:48 GMT"
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] | 2014-11-18T00:00:00 | [
[
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"Sheikh Shajidul",
""
],
[
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801.4355 | Jocelyne Troccaz | Jean-Jacques Banihachemi (TIMC), Eric Boidard (TIMC), Jean-Luc Bosson
(TIMC, CHU-Grenoble CIC), Luc Bressollette, Ivan Bricault (TIMC, CHU-Grenoble
radio), Philippe Cinquin (TIMC), Gilbert Ferretti (CHU-Grenoble radio), Maud
Marchal (TIMC), Thomas Martinelli (CHU-Grenoble radio), Alexandre
Moreau-Gaudry (CHU-Grenoble CIC), Franck Pelissier, Christian Roux, Dominique
Saragaglia, Pierre Thorel, Jocelyne Troccaz (TIMC), Adriana Vilchis (TIMC) | TER: A Robot for Remote Ultrasonic Examination: Experimental Evaluations | null | Telesurgery, Springer Verlag (Ed.) (2008) 91-99 | null | null | cs.OH cs.RO | null | This chapter:
o Motivates the clinical use of robotic tele-echography
o Introduces the TER system
o Describes technical and clinical evaluations performed with TER
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:39:41 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Banihachemi",
"Jean-Jacques",
"",
"TIMC"
],
[
"Boidard",
"Eric",
"",
"TIMC"
],
[
"Bosson",
"Jean-Luc",
"",
"TIMC, CHU-Grenoble CIC"
],
[
"Bressollette",
"Luc",
"",
"TIMC, CHU-Grenoble\n radio"
],
[
"Bricault",
"Ivan",
"",
"TIMC, CHU-Grenoble\n radio"
],
[
"Cinquin",
"Philippe",
"",
"TIMC"
],
[
"Ferretti",
"Gilbert",
"",
"CHU-Grenoble radio"
],
[
"Marchal",
"Maud",
"",
"TIMC"
],
[
"Martinelli",
"Thomas",
"",
"CHU-Grenoble radio"
],
[
"Moreau-Gaudry",
"Alexandre",
"",
"CHU-Grenoble CIC"
],
[
"Pelissier",
"Franck",
"",
"TIMC"
],
[
"Roux",
"Christian",
"",
"TIMC"
],
[
"Saragaglia",
"Dominique",
"",
"TIMC"
],
[
"Thorel",
"Pierre",
"",
"TIMC"
],
[
"Troccaz",
"Jocelyne",
"",
"TIMC"
],
[
"Vilchis",
"Adriana",
"",
"TIMC"
]
] | [
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801.4356 | Alexander Poteryaev I. | Alexander I. Poteryaev, Michel Ferrero, Antoine Georges, and Olivier
Parcollet | Effect of Crystal-Field Splitting and Inter-Band Hybridization on the
Metal-Insulator Transitions of Strongly Correlated Systems | 12 pages, 10 figures One figure added. Text revised according to PRB
proof. Appear in PRB 72 | Phys. Rev. B 78, 045115 (2008) (11 pages) | 10.1103/PhysRevB.78.045115 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a quarter-filled two-band Hubbard model involving a
crystal-field splitting, which lifts the orbital degeneracy as well as an
inter-orbital hopping (inter-band hybridization). Both terms are relevant to
the realistic description of correlated materials such as transition-metal
oxides. The nature of the Mott metal-insulator transition is clarified and is
found to depend on the magnitude of the crystal-field splitting. At large
values of the splitting, a transition from a two-band to a one-band metal is
first found as the on-site repulsion is increased and is followed by a Mott
transition for the remaining band, which follows the single-band
(Brinkman-Rice) scenario well documented previously within dynamical mean-field
theory. At small values of the crystal-field splitting, a direct transition
from a two-band metal to a Mott insulator with partial orbital polarization is
found, which takes place simultaneously for both orbitals. This transition is
characterized by a vanishing of the quasiparticle weight for the majority
orbital but has a first-order character for the minority orbital. It is pointed
out that finite-temperature effects may easily turn the metallic regime into a
bad metal close to the orbital polarization transition in the metallic phase.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:40:18 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Jul 2008 10:28:16 GMT"
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] | 2008-07-28T00:00:00 | [
[
"Poteryaev",
"Alexander I.",
""
],
[
"Ferrero",
"Michel",
""
],
[
"Georges",
"Antoine",
""
],
[
"Parcollet",
"Olivier",
""
]
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] |
801.4357 | Feng Yuan | Feng Yuan | Heavy Quarkonium Production in Single Transverse Polarized High Energy
Scattering | 10 pages, 4 figures | Phys.Rev.D78:014024,2008 | 10.1103/PhysRevD.78.014024 | RBRC-717, LBNL-63751 | hep-ph | null | We formulate the single transverse spin asymmetry in heavy quarkonium
production in lepton-nucleon and nucleon-nucleon collisions in the
non-relativistic limit. We find that the asymmetry is very sensitive to the
production mechanism. The final state interactions with the heavy quark and
antiquark cancel out among themselves when the pair are produced in a
color-single configuration, or cancel out with the initial state interaction in
pp scattering when they are in color-octet. As a consequence, the asymmetry is
nonzero in ep collisions only in the color-octet model, whereas in pp
collisions only in the color-singlet model.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:46:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yuan",
"Feng",
""
]
] | [
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] |
801.4358 | David Martin de Diego | Manuel de Leon, Juan Carlos Marrero and D. Martin de Diego | Linear almost Poisson structures and Hamilton-Jacobi equation.
Applications to nonholonomic Mechanics | 36 pages, 1 figure | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the underlying geometry in the classical
Hamilton-Jacobi equation. The proposed formalism is also valid for nonholonomic
systems. We first introduce the essential geometric ingredients: a vector
bundle, a linear almost Poisson structure and a Hamiltonian function, both on
the dual bundle (a Hamiltonian system). From them, it is possible to formulate
the Hamilton-Jacobi equation, obtaining as a particular case, the classical
theory. The main application in this paper is to nonholonomic mechanical
systems. For it, we first construct the linear almost Poisson structure on the
dual space of the vector bundle of admissible directions, and then, apply the
Hamilton-Jacobi theorem. Another important fact in our paper is the use of the
orbit theorem to symplify the Hamilton-Jacobi equation, the introduction of the
notion of morphisms preserving the Hamiltonian system; indeed, this concept
will be very useful to treat with reduction procedures for systems with
symmetries. Several detailed examples are given to illustrate the utility of
these new developments.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:48:45 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Jan 2009 11:29:27 GMT"
},
{
"version": "v3",
"created": "Fri, 13 Nov 2009 22:38:44 GMT"
}
] | 2009-11-14T00:00:00 | [
[
"de Leon",
"Manuel",
""
],
[
"Marrero",
"Juan Carlos",
""
],
[
"de Diego",
"D. Martin",
""
]
] | [
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] |
801.4359 | V. A. Yerokhin | V. A. Yerokhin | Hyperfine structure of S states in Li and Be^+ | 4 pages, 2 tables | Phys. Rev. A 77, 020501(R) (2008) | 10.1103/PhysRevA.77.020501 | null | physics.atom-ph | null | A large-scale configuration-interaction (CI) calculation is reported for the
hyperfine splitting of the 2^2S and 3^2S states of ^7Li and ^9Be^+. The CI
calculation based on the Dirac-Coulomb-Breit Hamiltonian is supplemented with a
separate treatment of the QED, nuclear-size, nuclear-magnetization
distribution, and recoil corrections. The nonrelativistic limit of the CI
results is in excellent agreement with variational calculations. The
theoretical values obtained for the hyperfine splitting are complete to the
relative order of \alpha^2 and improve upon results of previous studies.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 18:49:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yerokhin",
"V. A.",
""
]
] | [
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] |
801.436 | Victor Manosa | Anna Cima, Armengol Gasull, Victor Manosa | Some properties of the k-dimensional Lyness' map | 22 pages; 3 figures | J. of Physics A: Mathematical & Theoretical 41 (2008) 285205 | 10.1088/1751-8113/41/28/285205 | null | math.DS math-ph math.MP | null | This paper is devoted to study some properties of the k-dimensional Lyness'
map. Our main result presentes a rational vector field that gives a Lie
symmetry for F. This vector field is used, for k less or equal to 5 to give
information about the nature of the invariant sets under F. When k is odd, we
also present a new (as far as we know) first integral for F^2 which allows to
deduce in a very simple way several properties of the dynamical system
generated by F. In particular for this case we prove that, except on a given
codimension one algebraic set, none of the positive initial conditions can be a
periodic point of odd period.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:00:23 GMT"
}
] | 2010-12-23T00:00:00 | [
[
"Cima",
"Anna",
""
],
[
"Gasull",
"Armengol",
""
],
[
"Manosa",
"Victor",
""
]
] | [
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] |
801.4361 | Wojciech Broniowski | Wojciech Broniowski, Mikolaj Chojnacki, Wojciech Florkowski, Adam
Kisiel | Initial condition for hydrodynamics, partonic free streaming, and the
uniform description of soft observables at RHIC | 4 pages, 4 figures | Phys.Rev.Lett.101:022301,2008 | 10.1103/PhysRevLett.101.022301 | null | nucl-th hep-ph nucl-ex | null | We investigate the role of the initial condition used for the hydrodynamic
evolution of the system formed in ultra-relativistic heavy-ion collisions and
find that an appropriate choice motivated by the models of early-stage
dynamics, specifically a simple two-dimensional Gaussian profile, leads to a
uniform description of soft observables measured in the Relativistic Heavy-Ion
Collider (RHIC). In particular, the transverse-momentum spectra, the
elliptic-flow, and the Hanbury-Brown--Twiss correlation radii, including the
ratio R_out/R_side as well as the dependence of the radii on the azimuthal
angle (azHBT), are properly described. We use the perfect-fluid hydrodynamics
with a realistic equation of state based on lattice calculations and the
hadronic gas at high and low temperatures, respectively. We also show that the
inclusion of the partonic free-streaming in the early stage allows to delay the
start of the hydrodynamical description to comfortable times of the order of 1
fm/c. Free streaming broadens the initial energy-density profile, but generates
the initial transverse and elliptic flow. The data may be described equally
well when the hydrodynamics is started early, or with a delay due to partonic
free-streaming.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:06:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Broniowski",
"Wojciech",
""
],
[
"Chojnacki",
"Mikolaj",
""
],
[
"Florkowski",
"Wojciech",
""
],
[
"Kisiel",
"Adam",
""
]
] | [
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] |
801.4362 | Sung-Chul Yoon | S.-C. Yoon, N. Langer, M. Cantiello, S.E. Woosley and G.A. Glatzmaier | Evolution of progenitor stars of Type Ibc supernovae and long gamma-ray
bursts | 6 pages, 4 figures, to appear in IAU Symp. 250, Massive Stars as
Cosmic Engines, Kauai (HI), 12/2007, ed. F. Bresolin, P. Crowther, & J. Puls | null | 10.1017/S174392130802053X | null | astro-ph | null | We discuss how rotation and binary interactions may be related to the
diversity of type Ibc supernovae and long gamma-ray bursts. After presenting
recent evolutionary models of massive single and binary stars including
rotation, the Tayler-Spruit dynamo and binary interactions, we argue that the
nature of SNe Ibc progenitors from binary systems may not significantly differ
from that of single star progenitors in terms of rotation, and that most long
GRB progenitors may be produced via the quasi-chemically homogeneous evolution
at sub-solar metallicity. We also briefly discuss the possible role of magnetic
fields generated in the convective core of a massive star for the transport of
angular momentum, which is potentially important for future stellar evolution
models of supernova and GRB progenitors.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 20:04:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yoon",
"S. -C.",
""
],
[
"Langer",
"N.",
""
],
[
"Cantiello",
"M.",
""
],
[
"Woosley",
"S. E.",
""
],
[
"Glatzmaier",
"G. A.",
""
]
] | [
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801.4363 | Diego Guadagnoli | Wolfgang Altmannshofer, Diego Guadagnoli, Stuart Raby, David M. Straub | SUSY GUTs with Yukawa unification: a go/no-go study using FCNC processes | 10 pages, 1 figure, 5 tables. v3: A few textual modifications.
Conclusions unchanged. Matches journal version | Phys.Lett.B668:385-391,2008 | 10.1016/j.physletb.2008.08.063 | TUM-HEP-681/08, OHSTPY-HEP-T-08-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the viability of exact Yukawa unification in the context of
general SUSY GUTs with universal soft-breaking sfermion and gaugino mass terms
at the GUT scale. We find that this possibility is challenged, unless the
squark spectrum is pushed well above the limits allowed by naturalness. This
conclusion is assessed through a global fit using electroweak observables and
quark flavour-changing neutral current (FCNC) processes. The problem is mostly
the impossibility of accommodating simultaneously the bottom mass and the BR(B
--> Xs gamma), after the stringent CDF upper bound on the decay Bs --> mu^+
mu^- is taken into account, and under the basic assumption that the b --> s
gamma amplitude have like sign with respect to the Standard Model one, as
indicated by the B --> Xs l^+ l^- data.
With the same strategy, we also consider the possibility of relaxing Yukawa
unification to b - tau Yukawa unification. We find that with small departures
from the condition tan beta ~= 50, holding when Yukawa unification is exact,
the mentioned tension is substantially relieved. We emphasize that in the
region where fits are successful the lightest part of the SUSY spectrum is
basically fixed by the requirements of b - tau unification and the applied FCNC
constraints. As such, it is easily falsifiable once the LHC turns on.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:08:45 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 15:13:36 GMT"
},
{
"version": "v3",
"created": "Sat, 13 Sep 2008 07:46:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Guadagnoli",
"Diego",
""
],
[
"Raby",
"Stuart",
""
],
[
"Straub",
"David M.",
""
]
] | [
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801.4364 | Victoria Gitman | Victoria Gitman | Scott's problem for proper Scott sets | null | null | null | null | math.LO | null | I show that assuming PFA, every proper Scott set is the standard system of a
model of PA. A Scott set X is proper if it is arithmetically closed and the
quotient Boolean algebra X/Fin is a proper partial order.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:13:12 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Gitman",
"Victoria",
""
]
] | [
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] |
801.4365 | Wang Weiming | Lei Zhang, Weiming Wang, Yakui Xue, Zhen Jin | Complex dynamics of a Holling-type IV predator-prey model | null | null | null | null | q-bio.PE | null | In this paper, we focus on a spatial Holling-type IV predator-prey model
which contains some important factors, such as diffusion, noise (random
fluctuations) and external periodic forcing. By a brief stability and
bifurcation analysis, we arrive at the Hopf and Turing bifurcation surface and
derive the symbolic conditions for Hopf and Turing bifurcation in the spatial
domain. Based on the stability and bifurcation analysis, we obtain spiral
pattern formation via numerical simulation. Additionally, we study the model
with colored noise and external periodic forcing. From the numerical results,
we know that noise or external periodic forcing can induce instability and
enhance the oscillation of the species, and resonant response. Our results show
that modeling by reaction-diffusion equations is an appropriate tool for
investigating fundamental mechanisms of complex spatiotemporal dynamics.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:17:09 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Zhang",
"Lei",
""
],
[
"Wang",
"Weiming",
""
],
[
"Xue",
"Yakui",
""
],
[
"Jin",
"Zhen",
""
]
] | [
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801.4366 | Ramon Van Handel | Ramon van Handel | The stability of conditional Markov processes and Markov chains in
random environments | Published in at http://dx.doi.org/10.1214/08-AOP448 the Annals of
Probability (http://www.imstat.org/aop/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Annals of Probability 2009, Vol. 37, No. 5, 1876-1925 | 10.1214/08-AOP448 | IMS-AOP-AOP448 | math.PR math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a discrete time hidden Markov model where the signal is a
stationary Markov chain. When conditioned on the observations, the signal is a
Markov chain in a random environment under the conditional measure. It is shown
that this conditional signal is weakly ergodic when the signal is ergodic and
the observations are nondegenerate. This permits a delicate exchange of the
intersection and supremum of $\sigma$-fields, which is key for the stability of
the nonlinear filter and partially resolves a long-standing gap in the proof of
a result of Kunita [J. Multivariate Anal. 1 (1971) 365--393]. A similar result
is obtained also in the continuous time setting. The proofs are based on an
ergodic theorem for Markov chains in random environments in a general state
space.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:56:47 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Sep 2009 13:34:20 GMT"
}
] | 2009-09-24T00:00:00 | [
[
"van Handel",
"Ramon",
""
]
] | [
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] |
801.4367 | Thomas E. Mark | Thomas E. Mark | Knotted surfaces in 4-manifolds | Improved exposition, and minor extension of result to include
surfaces in symplectic manifolds with b^+ = 1 | null | null | null | math.GT | null | Fintushel and Stern have proved that if S \subset X is a symplectic surface
in a symplectic 4-manifold such that S has simply-connected complement and
nonnegative self-intersection, then there are infinitely many topologically
equivalent but smoothly distinct embedded surfaces homologous to S. Here we
extend this result to include symplectic surfaces whose self-intersection is
bounded below by 2-2g, where g is the genus of S.
We make use of tools from Heegaard Floer theory, and include several results
that may be of independent interest. Specifically we give an analogue for
Ozsvath-Szabo invariants of the Fintushel-Stern knot surgery formula for
Seiberg-Witten invariants, both for closed 4-manifolds and manifolds with
boundary. This is based on a formula for the Ozsvath-Szabo invariants of the
result of a logarithmic transformation, analogous to one obtained by
Morgan-Mrowka-Szab\'o for Seiberg-Witten invariants, and the results on
Ozsvath-Szabo invariants of fiber sums due to the author and Jabuka. In
addition, we give a calculation of the twisted Heegaard Floer homology of
circle bundles of "large" degree over Riemann surfaces.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:21:50 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Apr 2008 18:29:42 GMT"
}
] | 2008-04-18T00:00:00 | [
[
"Mark",
"Thomas E.",
""
]
] | [
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801.4368 | Victoria Gitman | Victoria Gitman | Proper and piecewise proper families of reals | null | null | null | null | math.LO | null | I introduced the notions of proper and piecewise proper families of reals to
make progress on an open question in the field of models of PA about whether
every Scott set is the standard system of a model of PA. A family of reals X is
proper if it is arithmetically closed and the quotient Boolean algebra X/fin is
a proper poset. A family is piecewise proper if it is the union of a chain of
proper families of size $\leq\omega_1$. Here, I explore the question of the
existence of proper and piecewise proper families of reals of different
cardinalities.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:25:41 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Gitman",
"Victoria",
""
]
] | [
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801.4369 | Paolo Amore Dr | Paolo Amore | A new method for studying the vibration of non-homogeneous membranes | 16 pages, 7 figures, 6 tables | null | 10.1016/j.jsv.2008.09.024 | null | physics.comp-ph | null | We present a method to solve the Helmholtz equation for a non-homogeneous
membrane with Dirichlet boundary conditions at the border of arbitrary
two-dimensional domains. The method uses a collocation approach based on a set
of localized functions, called "little sinc functions", which are used to
discretize two-dimensional regions. We have performed extensive numerical tests
and we have compared the results obtained with the present method with the ones
available from the literature. Our results show that the present method is very
accurate and that its implementation for general problems is straightforward.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 19:33:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amore",
"Paolo",
""
]
] | [
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] |
801.437 | Joachim Nagel | J. Nagel, D. Speer, T. Gaber, A. Sterck, R. Eichhorn, P. Reimann, K.
Ilin, M. Siegel, D. Koelle, and R. Kleiner | Observation of negative absolute resistance in a Josephson junction | 4 pages, 3 figures, submitted to Physical Review | null | 10.1103/PhysRevLett.100.217001 | null | nlin.CD | null | We experimentally demonstrate the occurrence of negative absolute resistance
(NAR) up to about $-1\Omega$ in response to an externally applied dc current
for a shunted Nb-Al/AlO$_x$-Nb Josephson junction, exposed to a microwave
current at frequencies in the GHz range. The realization (or not) of NAR
depends crucially on the amplitude of the applied microwave current.
Theoretically, the system is described by means of the resistively and
capacitively shunted junction model in terms of a moderately damped, classical
Brownian particle dynamics in a one-dimensional potential. We find excellent
agreement of the experimental results with numerical simulations of the model.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 20:06:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagel",
"J.",
""
],
[
"Speer",
"D.",
""
],
[
"Gaber",
"T.",
""
],
[
"Sterck",
"A.",
""
],
[
"Eichhorn",
"R.",
""
],
[
"Reimann",
"P.",
""
],
[
"Ilin",
"K.",
""
],
[
"Siegel",
"M.",
""
],
[
"Koelle",
"D.",
""
],
[
"Kleiner",
"R.",
""
]
] | [
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801.4371 | Alan Boss | Alan P. Boss | Flux-Limited Diffusion Approximation Models of Giant Planet Formation by
Disk Instability | 30 pages, 15 figures. Astrophysical Journal, in press (May 10 issue) | null | 10.1086/533496 | null | astro-ph | null | Both core accretion and disk instability appear to be required as formation
mechanisms in order to explain the entire range of giant planets found in
extrasolar planetary systems. Disk instability is based on the formation of
clumps in a marginally-gravitationally unstable protoplanetary disk. These
clumps can only be expected to contract and survive to become protoplanets if
they are able to lose thermal energy through a combination of convection and
radiative cooling. Here we present several new three dimensional, radiative
hydrodynamics models of self-gravitating protoplanetary disks, where radiative
transfer is handled in the flux-limited diffusion approximation. We show that
while the flux-limited models lead to higher midplane temperatures than in a
diffusion approximation model without the flux-limiter, the difference in
temperatures does not appear to be sufficiently high to have any significant
effect on the formation of self-gravitating clumps. Self-gravitating clumps
form rapidly in the models both with and without the flux-limiter. These models
suggest that the reason for the different outcomes of numerical models of disk
instability by different groups cannot be attributed solely to the handling of
radiative transfer, but rather appears to be caused by a range of numerical
effects and assumptions. Given the observational imperative to have disk
instability form at least some extrasolar planets, these models imply that disk
instability remains as a viable giant planet formation mechanism.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 20:11:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boss",
"Alan P.",
""
]
] | [
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] |
801.4372 | Jaime Hoyos | J. Hoyos, A. Reisenegger, J.A. Valdivia | Magnetic Field Evolution in Neutron Stars: One-Dimensional Multi-Fluid
Model | Paper Accepted in Astronomy & Astrophysics: 24 April 2008, Paper
Reference Number: AA/2008/09466. Paper contains 8 Figures. In this version
the section: Summary and Conclusions has been expanded | null | 10.1051/0004-6361:200809466 | AA/2008/09466 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is the first in a series aimed at understanding the long-term
evolution of neutron star magnetic fields. We model the stellar matter as an
electrically neutral and lightly ionized plasma composed of three moving
particle species: neutrons, protons, and electrons, which can be converted into
each other by weak interactions (beta decays), suffer binary collisions, and be
affected by each other's macroscopic electromagnetic fields. Since the
evolution of the magnetic field occurs over thousands of years or more,
compared to dynamical time scales (sound and Alfv\'en) of milliseconds to
seconds, we use a slow-motion approximation in which we neglect the inertial
terms in the equations of motion for the particles. We restrict ourselves to a
one-dimensional geometry in which the magnetic field points in one Cartesian
direction but varies only along an orthogonal direction. We study the evolution
of the system in three different ways: (i) estimating time scales directly from
the equations, guided by physical intuition; (ii) a normal-mode analysis in the
limit of a nearly uniform system; and (iii) a finite-difference numerical
integration of the equations of motion. We find good agreement between our
analytical normal-mode solutions and the numerical simulations. We show that
the magnetic field and the particles evolve through successive
quasi-equilibrium states, on time scales that can be understood by physical
arguments. Depending of the parameter values the magnetic field can evolve by
ohmic diffusion or by ambipolar diffusion, the latter being limited either by
interparticle collisions or by relaxation to chemical equilibrium through beta
decays. The numerical simulations are further validated by verifying that they
satisfy the known conservation laws also in highly non-linear situations.
| [
{
"version": "v1",
"created": "Mon, 28 Jan 2008 20:17:24 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jul 2008 12:55:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hoyos",
"J.",
""
],
[
"Reisenegger",
"A.",
""
],
[
"Valdivia",
"J. A.",
""
]
] | [
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