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801.3873
Junbo Li
Junbo Li, Yucai Su
2-Cocycles of Original Deformative Schr\"{o}dinger-Virasoro Algebras
13pages
null
10.1007/s11425-008-0115-y
null
math.RA
null
Both original and twisted Schr\"{o}dinger-Virasoro algebras also their deformations were introduced and investigated in a series of papers by Henkel, Roger and Unterberger. In the present paper we aim to determine the 2-cocycles of original deformative Schr\"{o}dinger-Virasoro algebras.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 03:43:44 GMT" } ]
2015-05-13T00:00:00
[ [ "Li", "Junbo", "" ], [ "Su", "Yucai", "" ] ]
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801.3874
Vladimir Dzhunushaliev
V. Dzhunushaliev, V. Folomeev, S. Myrzakul and R. Myrzakulov
Usual and phantom scalar fields in five dimensions: compactification and flat thick brane solutions
title is changed, new results are added
null
null
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the model of a gravitating system with two scalar fields (one of which is phantom), two new types of regular solutions are found: mechanism for compactification of an extra dimension and a flat thick brane solution. It is shown that the first model has solutions oscillating over the extra coordinate and giving a finite radius of compactification of the fifth dimension and the second model is a flat thick brane embedded in the 5D Minkowski spacetime. Geometry of both models corresponds to a five-dimensional Minkowski space-time. Consideration of linear perturbations shows stability of the obtained solutions.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 03:30:13 GMT" }, { "version": "v2", "created": "Wed, 8 Oct 2008 16:39:59 GMT" } ]
2008-10-08T00:00:00
[ [ "Dzhunushaliev", "V.", "" ], [ "Folomeev", "V.", "" ], [ "Myrzakul", "S.", "" ], [ "Myrzakulov", "R.", "" ] ]
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801.3875
Jan Mandel
Jan Mandel, Jonathan D. Beezley, Soham Chakraborty, Janice L. Coen, Craig C. Douglas, Anthony Vodacek, Zhen Wang
Towards a Real-Time Data Driven Wildland Fire Model
5 pages, 4 figures
IEEE International Symposium on Parallel and Distributed Processing, 2008 (IPDPS 2008), pp. 1-5
10.1109/IPDPS.2008.4536414
UCD CCM Report 265
physics.ao-ph cs.CE
null
A wildland fire model based on semi-empirical relations for the spread rate of a surface fire and post-frontal heat release is coupled with the Weather Research and Forecasting atmospheric model (WRF). The propagation of the fire front is implemented by a level set method. Data is assimilated by a morphing ensemble Kalman filter, which provides amplitude as well as position corrections. Thermal images of a fire will provide the observations and will be compared to a synthetic image from the model state.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 04:41:01 GMT" }, { "version": "v2", "created": "Sun, 27 Jan 2008 00:40:22 GMT" } ]
2015-08-03T00:00:00
[ [ "Mandel", "Jan", "" ], [ "Beezley", "Jonathan D.", "" ], [ "Chakraborty", "Soham", "" ], [ "Coen", "Janice L.", "" ], [ "Douglas", "Craig C.", "" ], [ "Vodacek", "Anthony", "" ], [ "Wang", "Zhen", "" ] ]
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801.3876
Gautam Menon
S.M. Kamil, Sudeshna Sinha and Gautam I. Menon (IMSc, Chennai)
Regular and Chaotic States in a Local Map Description of Sheared Nematic Liquid Crystals
11 pages, higher quality figures available on request, references added
null
10.1103/PhysRevE.78.011706
null
cond-mat.soft cond-mat.stat-mech
null
We propose and study a local map capable of describing the full variety of dynamical states, ranging from regular to chaotic, obtained when a nematic liquid crystal is subjected to a steady shear flow. The map is formulated in terms of a quaternion parametrization of rotations of the local frame described by the axes of the nematic director, subdirector and the joint normal to these, with two additional scalars describing the strength of ordering. Our model yields kayaking, wagging, tumbling, aligned and coexistence states, in agreement with previous formulations based on coupled ordinary differential equations. Such a map can serve as a building block for the construction of lattice models of the complex spatio-temporal states predicted for sheared nematics.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 04:40:08 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 05:47:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Kamil", "S. M.", "", "IMSc, Chennai" ], [ "Sinha", "Sudeshna", "", "IMSc, Chennai" ], [ "Menon", "Gautam I.", "", "IMSc, Chennai" ] ]
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801.3877
John Conway
CDF Collaboration: T. Aaltonen, et al
Search for Heavy Top-like Quarks t' -> Wq Using Lepton Plus Jets Events in 1.96 TeV Proton-Antiproton Collisions
7 pages, 2 figures
Phys.Rev.Lett.100:161803,2008
10.1103/PhysRevLett.100.161803
null
hep-ex
null
We present the results of a search for pair production of a new heavy top-like quark t' decaying to a W boson and another quark using the CDF II detector in Run II of the Tevatron proton-antiproton collider. Using a data sample corresponding to 760 pb^-1 of integrated luminosity, we fit the observed spectrum of total transverse energy and reconstructed t' quark mass to a combination of standard model processes and t' pair production. We see no evidence for t' pair production, and we infer a lower limit of 256 GeV/c^2 on the mass of the t' at 95% C.L. assuming standard strong couplings for the t'.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 05:10:57 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF Collaboration", "", "" ], [ "Aaltonen", "T.", "" ] ]
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801.3878
Jun Muramatsu
Jun Muramatsu and Shigeki Miyake
Hash Property and Coding Theorems for Sparse Matrices and Maximum-Likelihood Coding
This manuscript has been submitted to IEEE Transactions on Information Theory and a part of this manuscript has been submitted to IEEE International Symposium on Information Theory (ISIT2008,ISIT2009). 55 pages v2: major changes
IEEE Transactions on Information Theory, vol 56, no. 5, pp.2143-2167, May 2010; Corrections: IEEE Transactions on Information Theory, vol. 56, no.9, p. 4762, Sep. 2010. Corrections: vol.56, no.9, p.4762, 2010
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of this paper is to prove the achievability of several coding problems by using sparse matrices (the maximum column weight grows logarithmically in the block length) and maximal-likelihood (ML) coding. These problems are the Slepian-Wolf problem, the Gel'fand-Pinsker problem, the Wyner-Ziv problem, and the One-helps-one problem (source coding with partial side information at the decoder). To this end, the notion of a hash property for an ensemble of functions is introduced and it is proved that an ensemble of $q$-ary sparse matrices satisfies the hash property. Based on this property, it is proved that the rate of codes using sparse matrices and maximal-likelihood (ML) coding can achieve the optimal rate.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 05:13:11 GMT" }, { "version": "v2", "created": "Thu, 19 Mar 2009 07:37:34 GMT" } ]
2013-01-28T00:00:00
[ [ "Muramatsu", "Jun", "" ], [ "Miyake", "Shigeki", "" ] ]
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801.3879
Banibrata Mukhopadhyay
Banibrata Mukhopadhyay, Kaushik Ghosh
Separation of Dirac equation in the 3+1 dimensional constant curvature black hole background and its solution
13 latex pages; accepted for publication in Classical and Quantum Gravity
Class.Quant.Grav.25:065006,2008
10.1088/0264-9381/25/6/065006
null
gr-qc astro-ph hep-th
null
The behavior of spin-half particles is discussed in the 3 + 1-dimensional constant curvature black hole (CCBH) spacetime. We use Schwarzschild-like coordinates, valid outside the black hole event horizon. The constant time surfaces corresponding to the time-like Killing vector are degenerate at the black hole event horizon and also along an axis. We write down the Dirac equation in this spacetime using Newman-Penrose formalism which is not easily separable unlike that in the Kerr metric. However, with a particular choice of basis system the equation is separable and we obtain the solutions. We discuss the structural difference in the Dirac equation in the CCBH spacetime with that in the Kerr geometry, due to difference in the corresponding spacetime metric, resulting complexity arised in separation in the earlier case.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 05:26:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Mukhopadhyay", "Banibrata", "" ], [ "Ghosh", "Kaushik", "" ] ]
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801.388
Yi Sun
Yi Sun
Spectral efficiency and optimal medium access control of random access systems over large random spreading CDMA
To appear in IEEE Trans. on Communications
null
10.1109/TCOMM.2009.05.07044
null
cs.IT math.IT
null
This paper analyzes the spectral efficiency as a function of medium access control (MAC) for large random spreading CDMA random access systems that employ a linear receiver. It is shown that located at higher than the physical layer, MAC along with spreading and power allocation can effectively perform spectral efficiency maximization and near-far mitigation.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 05:46:57 GMT" } ]
2016-11-15T00:00:00
[ [ "Sun", "Yi", "" ] ]
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801.3881
Gautam Menon
Gautam I. Menon and Sriram Ramaswamy
Universality Class of the Reversible-Irreversible Transition in Sheared Suspensions
4 pages, 2 figures, final version
Phys. Rev. E 79, 061108 (2009)
10.1103/PhysRevE.79.061108
null
cond-mat.soft cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Collections of non-Brownian particles suspended in a viscous fluid and subjected to oscillatory shear at very low Reynolds number have recently been shown to exhibit a remarkable dynamical phase transition separating reversible from irreversible behaviour as the strain amplitude or volume fraction are increased. We present a simple model for this phenomenon, based on which we argue that this transition lies in the universality class of the conserved DP models or, equivalently, the Manna model. This leads to predictions for the scaling behaviour of a large number of experimental observables. Non-Brownian suspensions under oscillatory shear may thus constitute the first experimental realization of an inactive-active phase transition which is not in the universality class of conventional directed percolation.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 05:47:06 GMT" }, { "version": "v2", "created": "Fri, 17 Jul 2009 04:57:28 GMT" } ]
2009-07-17T00:00:00
[ [ "Menon", "Gautam I.", "" ], [ "Ramaswamy", "Sriram", "" ] ]
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801.3882
Srijit Bhattacharya Mr.
Srijit Bhattacharya, S. Mukhopadhyay, Deepak Pandit, Surajit Pal, A. De, S. Bhattacharya, C. Bhattacharya, K. Banerjee, S. Kundu, T.K. Rana, A. Dey, G. Mukherjee, T. Ghosh, D. Gupta, S. R. Banerjee
Giant Dipole Resonance Width in near-Sn Nuclei at Low Temperature and High Angular Momentum
19 pages, 10 figures, Submitted to Physics Review C
Phys.Rev.C77:024318,2008
10.1103/PhysRevC.77.024318
null
nucl-ex
null
High energy gamma-rays in coincidence with low energy yrast gamma-rays have been measured from 113Sb, at excitation energies of 109 and 122 MeV, formed by bombarding 20Ne on 93Nb at projectile energies of 145 and 160 MeV respectively to study the role of angular momentum (J) and temperature (T) over Giant Dipole Resonance (GDR) width. The maximum populated angular momenta for fusion were 67hbar and 73hbar respectively for the above-mentioned beam energies. The high energy photons were detected using a Large Area Modular BaF2 Detector Array (LAMBDA) along with a 24-element multiplicity filter. After pre-equilibrium corrections, the excitation energy E* was averaged over the decay steps of the compound nucleus (CN). The average values of temperature, angular momentum, CN mass etc. have been calculated by the statistical model code CASCADE. Using those average values, results show the systematic increase of GDR width with T which is consistent with Kusnezov parametrization and the Thermal Shape Fluctuation Model. The rise of GDR width with temperature also supports the assumptions of adiabatic coupling in the Thermal Shape Fluctuation Model. But the GDR widths and corresponding reduced plots with J are not consistent with the theoretical model at high spins.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 05:50:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Bhattacharya", "Srijit", "" ], [ "Mukhopadhyay", "S.", "" ], [ "Pandit", "Deepak", "" ], [ "Pal", "Surajit", "" ], [ "De", "A.", "" ], [ "Bhattacharya", "S.", "" ], [ "Bhattacharya", "C.", "" ], [ "Banerjee", "K.", "" ], [ "Kundu", "S.", "" ], [ "Rana", "T. K.", "" ], [ "Dey", "A.", "" ], [ "Mukherjee", "G.", "" ], [ "Ghosh", "T.", "" ], [ "Gupta", "D.", "" ], [ "Banerjee", "S. R.", "" ] ]
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801.3883
Xicheng Zhang
Xicheng Zhang
Smooth Solutions of Non-linear Stochastic Partial Differential Equations
26Pages
null
null
null
math.PR math.AP
null
In this paper, we study the regularities of solutions of nonlinear stochastic partial differential equations in the framework of Hilbert scales. Then we apply our general result to several typical nonlinear SPDEs such as stochastic Burgers and Ginzburg-Landau's equations on the real line, stochastic 2D Navier-Stokes equations in the whole space and a stochastic tamed 3D Navier-Stokes equation in the whole space, and obtain the existence of their respectively smooth solutions.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 06:09:51 GMT" } ]
2008-01-28T00:00:00
[ [ "Zhang", "Xicheng", "" ] ]
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801.3884
Oren Raz
Oren Raz, Alexander M. Leshansky
How efficient is towing a cargo by a micro-swimmer?
4 pages, 3 figures
Phys. Rev. E 77, 055305 (2008)
10.1103/PhysRevE.77.055305
null
physics.flu-dyn
null
We study the properties of arbitrary micro-swimmers towing a passive load through a viscous liquid. The simple close-form expression for the dragging efficiency of a general micro-swimmer dragging a distant load is found, and the leading order approximation for finite mutual separation is derived. We show that, while swimmer can be arbitrarily efficient, dragging efficiency is always bounded from above. It is also demonstrated, that opposite to Purcell's assumption, the hydrodynamic coupling can ''help" the swimmer to drag the load. We support our conclusions by rigorous numerical calculations for the "necklace-shaped" swimmer, towing a spherical cargo positioned at a finite distance.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 06:21:27 GMT" } ]
2015-05-13T00:00:00
[ [ "Raz", "Oren", "" ], [ "Leshansky", "Alexander M.", "" ] ]
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801.3885
Beijiang Liu
BES Collaboration
Partial wave analysis of J/\psi \to \gamma \phi \phi
11 pages, 4 figures. corrected proof for journal
Phys.Lett.B662:330-335,2008
10.1016/j.physletb.2008.03.027
null
hep-ex
null
Using $5.8 \times 10^7 J/\psi$ events collected in the BESII detector, the radiative decay $J/\psi \to \gamma \phi \phi \to \gamma K^+ K^- K^0_S K^0_L$ is studied. The $\phi\phi$ invariant mass distribution exhibits a near-threshold enhancement that peaks around 2.24 GeV/$c^{2}$. A partial wave analysis shows that the structure is dominated by a $0^{-+}$ state ($\eta(2225)$) with a mass of $2.24^{+0.03}_{-0.02}{}^{+0.03}_{-0.02}$ GeV/$c^{2}$ and a width of $0.19 \pm 0.03^{+0.06}_{-0.04}$ GeV/$c^{2}$. The product branching fraction is: $Br(J/\psi \to \gamma \eta(2225))\cdot Br(\eta(2225)\to \phi\phi) = (4.4 \pm 0.4 \pm 0.8)\times 10^{-4}$.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 06:39:48 GMT" }, { "version": "v2", "created": "Sat, 16 Feb 2008 03:36:56 GMT" }, { "version": "v3", "created": "Tue, 15 Apr 2008 14:30:27 GMT" } ]
2012-08-27T00:00:00
[ [ "BES Collaboration", "", "" ] ]
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801.3886
Gavin Rowell
G. Rowell
Gamma-Ray, Neutrino & Gravitational Wave Detection: OG 2.5,2.6,2.7 Rapporteur
15 figs, 15 pages. Rapporteur presented at the 30th ICRC (Merida, Mexico, 2007)
null
null
null
astro-ph
null
This report is based on a rapporteur talk presented at the 30th International Cosmic Ray Conference held in Merida, Mexico (July 2007), and covers three of the OG sessions devoted to neutrino, gravitational wave, and gamma-ray detection.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:47:42 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 22:23:21 GMT" } ]
2009-09-29T00:00:00
[ [ "Rowell", "G.", "" ] ]
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801.3887
Christian Robert
Nicolas Chopin (CREST), Christian Robert (CREST, Ceremade)
Properties of Nested Sampling
Revision submitted to Biometrika
Biometrika 97(3):741-755, 2010
10.1093/biomet/asq021
null
stat.CO math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nested sampling is a simulation method for approximating marginal likelihoods proposed by Skilling (2006). We establish that nested sampling has an approximation error that vanishes at the standard Monte Carlo rate and that this error is asymptotically Gaussian. We show that the asymptotic variance of the nested sampling approximation typically grows linearly with the dimension of the parameter. We discuss the applicability and efficiency of nested sampling in realistic problems, and we compare it with two current methods for computing marginal likelihood. We propose an extension that avoids resorting to Markov chain Monte Carlo to obtain the simulated points.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:25:25 GMT" }, { "version": "v2", "created": "Sat, 25 Oct 2008 06:47:43 GMT" }, { "version": "v3", "created": "Fri, 10 Jul 2009 18:50:46 GMT" }, { "version": "v4", "created": "Fri, 10 Jul 2009 20:40:26 GMT" } ]
2010-10-11T00:00:00
[ [ "Chopin", "Nicolas", "", "CREST" ], [ "Robert", "Christian", "", "CREST, Ceremade" ] ]
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801.3888
Giorgio Fabbri
G. Fabbri and B. Goldys
An LQ problem for the heat equation on the halfline with Dirichlet boundary control and noise
16 pages. Many misprints have been corrected
null
null
null
math.PR math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a linear quadratic problem for a system governed by the heat equation on a halfline with Dirichlet boundary control and Dirichlet boundary noise. We show that this problem can be reformulated as a stochastic evolution equation in a certain weighted L2 space. An appropriate choice of weight allows us to prove a stronger regularity for the boundary terms appearing in the infinite dimensional state equation. The direct solution of the Riccati equation related to the associated non-stochastic problem is used to find the solution of the problem in feedback form and to write the value function of the problem.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:47:11 GMT" }, { "version": "v2", "created": "Tue, 3 Feb 2009 00:18:34 GMT" } ]
2009-02-03T00:00:00
[ [ "Fabbri", "G.", "" ], [ "Goldys", "B.", "" ] ]
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801.3889
Spyros Basilakos
S. Basilakos, M. Plionis and C. Ragone-Figueroa
The Halo Mass-Bias Redshift Evolution in the $\Lambda$CDM Cosmology
8 pages, 5 figures, accepted for publication in ApJ
null
10.1086/586725
null
astro-ph
null
We derive an analytic model for the redshift evolution of linear-bias, allowing for interactions and merging of the mass-tracers, by solving a second order differential equation based on linear perturbation theory and the Friedmann-Lemaitre solutions of the cosmological field equations. We then study the halo-mass dependence of the bias evolution, using the dark matter halo distribution in a $\Lambda$CDM simulation in order to calibrate the free parameters of the model. Finally, we compare our theoretical predictions with available observational data and find a good agreement. In particular, we find that the bias of optical QSO's evolve differently than those selected in X-rays and that their corresponding typical dark matter halo mass is $\sim 10^{13} h^{-1} M_{\odot}$ and $\magcir 5 \times 10^{13} h^{-1} M_{\odot}$, respectively.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:35:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Basilakos", "S.", "" ], [ "Plionis", "M.", "" ], [ "Ragone-Figueroa", "C.", "" ] ]
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801.389
Volker Meden
V. Meden, S. Andergassen, T. Enss, H. Schoeller, K. Schoenhammer
Fermionic renormalization group methods for transport through inhomogeneous Luttinger liquids
25 pages, accepted for publication in NJP, remarks added on the poor man's RG treatment of the Y-junction and the Breit-Wigner line shapes
New Journal of Physics 10, 045012 (2008)
10.1088/1367-2630/10/4/045012
null
cond-mat.str-el cond-mat.mes-hall
null
We compare two fermionic renormalization group methods which have been used to investigate the electronic transport properties of one-dimensional metals with two-particle interaction (Luttinger liquids) and local inhomogeneities. The first one is a poor man's method setup to resum ``leading-log'' divergences of the effective transmission at the Fermi momentum. Generically the resulting equations can be solved analytically. The second approach is based on the functional renormalization group method and leads to a set of differential equations which can only for certain setups and in limiting cases be solved analytically, while in general it must be integrated numerically. Both methods are claimed to be applicable for inhomogeneities of arbitrary strength and to capture effects of the two-particle interaction, such as interaction dependent exponents, up to leading order. We critically review this for the simplest case of a single impurity. While on first glance the poor man's approach seems to describe the crossover from the ``perfect'' to the ``open chain fixed point'' we collect evidence that difficulties may arise close to the ``perfect chain fixed point''. Due to a subtle relation between the scaling dimensions of the two fixed points this becomes apparent only in a detailed analysis. In the functional renormalization group method the coupling of the different scattering channels is kept which leads to a better description of the underlying physics.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:40:42 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 11:44:58 GMT" } ]
2008-05-02T00:00:00
[ [ "Meden", "V.", "" ], [ "Andergassen", "S.", "" ], [ "Enss", "T.", "" ], [ "Schoeller", "H.", "" ], [ "Schoenhammer", "K.", "" ] ]
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801.3891
Horatiu Stefan Nastase
Richard C. Brower, Horatiu Nastase, Howard J. Schnitzer and Chung-I Tan
Implications of multi-Regge limits for the Bern-Dixon-Smirnov conjecture
48 pages, 8 figures; Noted added commenting on related work which appeared after the initial posting. References and clarifications added, as well as typos corrected
Nucl.Phys.B814:293-326,2009
10.1016/j.nuclphysb.2009.02.009
null
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Planar ${\cal N} =4$ super Yang-Mills SU(N) theory is expected to exhibit stringy behavior, anticipated by the 't Hooft genus expansion and the $AdS/CFT$ correspondence. We examine the Bern-Dixon-Smirnov (BDS) conjecture for $n$-gluon amplitudes in the context of single-Regge and multi-Regge limits and show that these amplitudes have the expected Regge form in the Euclidean region.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:56:30 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 20:51:21 GMT" }, { "version": "v3", "created": "Fri, 15 Feb 2008 20:02:35 GMT" }, { "version": "v4", "created": "Fri, 6 Feb 2009 15:10:12 GMT" } ]
2011-05-18T00:00:00
[ [ "Brower", "Richard C.", "" ], [ "Nastase", "Horatiu", "" ], [ "Schnitzer", "Howard J.", "" ], [ "Tan", "Chung-I", "" ] ]
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801.3892
Dario Quintavalle
D. Quintavalle, F. Borondics, G. Klupp, A. Baserga, F. Simon, A. Janossy, K. Kamaras, S. Pekker
Mg5C60: A stable two dimensional conducting polymer
5 pages 6 figures
null
null
null
cond-mat.str-el
null
We present a study on the structural, spectroscopic, conducting and magnetic properties of Mg5C60, a two dimensional (2D) fulleride polymer. The polymer phase is stable up to the exceptionally high temperature of 823 K. Infrared and Raman studies suggest the formation of single bonds between fulleride ions and possibly Mg - C60 covalent bonds. Mg5C60 is a metal at ambient temperature as shown by electron spin resonance and microwave conductivity measurements. The smooth transition from a metallic to a paramagnetic insulator state below 200 K is attributed to Anderson localization driven by structural disorder.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 08:05:05 GMT" } ]
2008-01-28T00:00:00
[ [ "Quintavalle", "D.", "" ], [ "Borondics", "F.", "" ], [ "Klupp", "G.", "" ], [ "Baserga", "A.", "" ], [ "Simon", "F.", "" ], [ "Janossy", "A.", "" ], [ "Kamaras", "K.", "" ], [ "Pekker", "S.", "" ] ]
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801.3893
Anna Beliakova
Anna Beliakova, Irmgard Buehler, Thang Le
A Unified Quantum SO(3) Invariant for Rational Homology 3-Spheres
31 pages, 18 Figures; Appendix substantially revised
Inventiones, Volume 185, Issue 1 (2011), Page 121-174
10.1007/s00222-010-0304-5
null
math.GT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a rational homology 3-sphere M with the first integral homology of rank b and a link L inside M, colored by odd numbers, we construct a unified invariant I_{M,L} belonging to a modification of the Habiro ring where b is inverted. Our unified invariant dominates the whole set of the SO(3) Witten-Reshetikhin-Turaev invariants of the pair (M,L). If b=1 and L is empty, I_M coincides with Habiro's invariant of integral homology 3-spheres. For b>1, the unified invariant defined by the third author is determined by I_M. One of the applications are the new Ohtsuki series (perturbative expansions of I_M at roots of unity) dominating all quantum SO(3) invariants.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 07:58:04 GMT" }, { "version": "v2", "created": "Mon, 9 Feb 2009 11:21:38 GMT" }, { "version": "v3", "created": "Sat, 16 May 2009 06:35:14 GMT" } ]
2015-05-13T00:00:00
[ [ "Beliakova", "Anna", "" ], [ "Buehler", "Irmgard", "" ], [ "Le", "Thang", "" ] ]
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801.3894
Eric Gautier
Anne De Bouard (CMAP), Eric Gautier (CREST)
Exit problems related to the persistence of solitons for the Korteweg-de Vries equation with small noise
null
Discrete and Continuous Dynamical Systems - Series A 26, 3 (2010) 857 - 871
10.3934/dcds.2010.26.857
null
math.PR math.AP
null
We consider two exit problems for the Korteweg-de Vries equation perturbed by an additive white in time and colored in space noise of amplitude a. The initial datum gives rise to a soliton when a=0. It has been proved recently that the solution remains in a neighborhood of a randomly modulated soliton for times at least of the order of a^{-2}. We prove exponential upper and lower bounds for the small noise limit of the probability that the exit time from a neighborhood of this randomly modulated soliton is less than T, of the same order in a and T. We obtain that the time scale is exactly the right one. We also study the similar probability for the exit from a neighborhood of the deterministic soliton solution. We are able to quantify the gain of eliminating the secular modes to better describe the persistence of the soliton.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 08:08:18 GMT" } ]
2011-09-06T00:00:00
[ [ "De Bouard", "Anne", "", "CMAP" ], [ "Gautier", "Eric", "", "CREST" ] ]
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801.3895
Yuri Kovalev Jr.
L. Petrov (NVI, Inc./NASA GSFC), Y. Y. Kovalev (MPIfR and Asc Lebedev), E. B. Fomalont (NRAO), D. Gordon (NVI, Inc./NASA GSFC)
The Sixth VLBA Calibrator Survey: VCS6
6 pages, 3 figures, 5 tables; accepted for publication in the Astronomical Journal; minor changes to the text and tables are made; two tables in electronic form can be extracted from the preprint source
AJ 136 (2008) 580-585
10.1088/0004-6256/136/2/580
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents the sixth part to the Very Long Baseline Array (VLBA) Calibrator Survey. It contains the positions and maps of 264 sources of which 169 were not previously observed with very long baseline interferometry (VLBI). This survey, based on two 24 hour VLBA observing sessions, was focused on 1) improving positions of 95 sources from previous VLBA Calibrator surveys that were observed either with very large a priori position errors or were observed not long enough to get reliable positions and 2) observing remaining new flat-spectrum sources with predicted correlated flux density in the range 100-200 mJy that were not observed in previous surveys. Source positions were derived from astrometric analysis of group delays determined at the 2.3 and 8.6 GHz frequency bands using the Calc/Solve software package. The VCS6 catalogue of source positions, plots of correlated flux density versus projected baseline length, contour plots and fits files of naturally weighted CLEAN images, as well as calibrated visibility function files are available on the Web at http://vlbi.gsfc.nasa.gov/vcs6
[ { "version": "v1", "created": "Fri, 25 Jan 2008 13:05:13 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 21:58:03 GMT" }, { "version": "v3", "created": "Mon, 21 Jul 2008 11:09:06 GMT" } ]
2008-07-21T00:00:00
[ [ "Petrov", "L.", "", "NVI, Inc./NASA GSFC" ], [ "Kovalev", "Y. Y.", "", "MPIfR and Asc\n Lebedev" ], [ "Fomalont", "E. B.", "", "NRAO" ], [ "Gordon", "D.", "", "NVI, Inc./NASA GSFC" ] ]
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801.3896
Kazuhiko Kurano
Kazuhiko Kurano and Naoyuki Matsuoka
On finite generation of symbolic Rees rings of space monomial curves and existence of negative curves
In the previous version, there was a serious mistake in the last section
null
null
null
math.AC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we shall study finite generation of symbolic Rees rings of the defining ideal of the space monomial curves $(t^a, t^b, t^c)$ for pairwise coprime integers $a$, $b$, $c$ such that $(a,b,c) \neq (1,1,1)$. If such a ring is not finitely generated over a base field, then it is a counterexample to the Hilbert's fourteenth problem. Finite generation of such rings is deeply related to existence of negative curves on certain normal projective surfaces. We study a sufficient condition (Definition 3.6) for existence of a negative curve. Using it, we prove that, in the case of $(a+b+c)^2 > abc$, a negative curve exists. Using a computer, we shall show that there exist examples in which this sufficient condition is not satisfied.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 08:50:26 GMT" }, { "version": "v2", "created": "Tue, 2 Sep 2008 05:17:32 GMT" }, { "version": "v3", "created": "Thu, 3 Sep 2009 02:00:04 GMT" } ]
2009-09-03T00:00:00
[ [ "Kurano", "Kazuhiko", "" ], [ "Matsuoka", "Naoyuki", "" ] ]
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801.3897
Isabel Caballero
I.Caballero, P. Kretschmar, A.Santangelo, A.Segreto, C.Ferrigno, R.Staubert
Pulse Period History and Phase Resolved Spectra of 1A 0535+262
4 pages, 7 figures, published in Proceedings of the 6th INTEGRAL Workshop "The Obscured Universe"
Proceedings of the 6th INTEGRAL Workshop "The Obscured Universe", Published by ESA, 2007, SP-622, P.471-474
null
null
astro-ph
null
The Be/X-ray binary 1A 0535+262 was discovered in 1975 during a giant outburst. Afterwards it has shown periods of quiescence (flux below 10 mCrab), normal outbursts (10 mCrab-1Crab) and occasionally giant outbursts (several Crab). Ending 11 years of quiescence, the last giant outburst took place in May/June 2005, but the source was too close to the Sun to be observed by most satellites. A subsequent normal outburst took place in August 2005, which was observed by INTEGRAL and RXTE TOO observations. Based on INTEGRAL data, we present results on the long term pulse period history of the source, on their energy dependent pulse profiles and on phase resolved spectra.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:04:33 GMT" } ]
2008-01-28T00:00:00
[ [ "Caballero", "I.", "" ], [ "Kretschmar", "P.", "" ], [ "Santangelo", "A.", "" ], [ "Segreto", "A.", "" ], [ "Ferrigno", "C.", "" ], [ "Staubert", "R.", "" ] ]
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801.3898
Katia Biazzo Dr
A. Frasca (1), Zs. Kovari (2), K.G. Strassmeier (3), K. Biazzo (1) ((1) INAF - Catania Astrophysical Observatory, (2) Konkoly Observatory - Budapest, (3) Astrophysical Institute Potsdam)
Chromospheric features of LQ Hydrae from H-alpha line profiles
6 pages, 4 figures
null
10.1051/0004-6361:20079058
null
astro-ph
null
We analyze the H-alpha spectral variability of the rapidly-rotating K1-dwarf LQ Hya using high-resolution H-alpha spectra recorded during April-May 2000. Chromospheric parameters were computed from the H-alpha profile as a function of rotational phase. We find that all these parameters vary in phase, with a higher chromospheric electron density coinciding with the maximum H-alpha emission. We find a clear rotational modulation of the H-alpha emission that is better emphasized by subtracting a reference photospheric template built up with a spectrum of a non-active star of the same spectral type. A geometrical plage model applied to the H-alpha variation curve allows us to derive the location of the active regions that come out to be close in longitude to the most pronounced photospheric spots found with Doppler imaging applied to the photospheric lines in the same spectra. Our analysis suggests that the H-alpha features observed in LQ Hya in 2000 are a scaled-up version of the solar plages as regards dimensions and/or flux contrast. No clear indication of chromospheric mass motions emerges.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:19:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Frasca", "A.", "" ], [ "Kovari", "Zs.", "" ], [ "Strassmeier", "K. G.", "" ], [ "Biazzo", "K.", "" ] ]
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801.3899
Robert Thew
R. T. Thew, D. Stucki, J-D. Gautier, A. Rochas, and H. Zbinden
Free-running InGaAs/InP Avalanche Photodiode with Active Quenching for Single Photon Counting at Telecom Wavelengths
3 pages, 3 figures
Appl. Phys. Lett. 91, 201114 (2007)
10.1063/1.2815916
null
quant-ph
null
We present an InGaAs/InP avalanche photodiode with an active quenching circuit on an ASIC (application specific integrated circuit) that is capable of operating in both gated and free-running modes. The 1.6mm2 ASIC chip is fabricated using CMOS (complementary metal oxide semiconductor) technology guaranteeing long-term stability, reliability and compactness. In the free-running mode we find a single photon detection efficiency of 10% with <2kHz of noise.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:22:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Thew", "R. T.", "" ], [ "Stucki", "D.", "" ], [ "Gautier", "J-D.", "" ], [ "Rochas", "A.", "" ], [ "Zbinden", "H.", "" ] ]
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801.39
Ulrich Hohenester
Ulrich Hohenester and Andreas Truegler
Interaction of single molecules with metallic nanoparticles
12 pages, 4 figures
null
null
null
cond-mat.mes-hall
null
We theoretically investigate the interaction between a single molecule and a metallic nanoparticle. We develop a general quantum mechanical description for the calculation of the enhancement of radiative and non-radiative decay channels for a molecule situated in the nearfield regime of the metallic nanoparticle. Using a boundary element method approach, we compute the scattering rates for several nanoparticle shapes. We also introduce an eigenmode expansion and quantization scheme for the surface plasmons, which allows us to analyze the scattering processes in simple physical terms. An intuitive explanation is given for the large quantum yield of quasi one- and two-dimensional nanostructures. Finally, we briefly discuss resonant Foerster energy transfer in presence of metallic nanoparticles.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:34:09 GMT" } ]
2008-01-28T00:00:00
[ [ "Hohenester", "Ulrich", "" ], [ "Truegler", "Andreas", "" ] ]
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801.3901
Pedro Lopes
Pedro Lopes
Sequences of knots and their limits
null
null
10.1063/1.2958172
null
math.GT
null
Hyperfinite knots, or limits of equivalence classes of knots induced by a knot invariant taking values in a metric space, were introduced in a previous article by the author. In this article, we present new examples of hyperfinite knots stemming from sequences of torus knots.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:51:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Lopes", "Pedro", "" ] ]
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801.3902
Edward I. George
Edward I. George
A Tribute to Ingram Olkin
Published in at http://dx.doi.org/10.1214/07-STS250 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Statistical Science 2007, Vol. 22, No. 3, 400-400
10.1214/07-STS250
IMS-STS-STS250
stat.ME
null
It is with pleasure and pride that I introduce this special section in honor of Ingram Olkin. This tribute is especially fitting because, among the many profound and far-reaching contributions that he has made to our profession, Ingram Olkin was the key force behind the genesis of Statistical Science. As put so eloquently by Morrie DeGroot [1], the founding Executive Editor of Statistical Science.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:54:25 GMT" } ]
2008-02-08T00:00:00
[ [ "George", "Edward I.", "" ] ]
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801.3903
Henrik Olofsson
S. {\AA}berg, H. Olofsson and P. Leboeuf
Mesoscopic Fluctuations of the Pairing Gap
Conference Proceeding of Mesoscopic Workshop WNMP07
AIP Conf.Proc.995:173-184,2008
10.1063/1.2915592
null
nucl-th
null
A description of mesoscopic fluctuations of the pairing gap in finite-sized quantum systems based on periodic orbit theory is presented. The size of the fluctuations are found to depend on quite general properties. We distinguish between systems where corresponding classical motion is regular or chaotic, and describe in detail fluctuations of the BCS gap as a function of the size of the system. The theory is applied to different mesoscopic systems: atomic nuclei, metallic grains, and ultracold fermionic gases. We also present a detailed description of pairing gap variation with particle number for nuclei based on a deformed cavity potential.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 09:56:58 GMT" } ]
2011-04-11T00:00:00
[ [ "Åberg", "S.", "" ], [ "Olofsson", "H.", "" ], [ "Leboeuf", "P.", "" ] ]
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801.3904
Jonas Kiessling
Jonas Kiessling
Classification of certain cellular classes of chain complexes
6 pages
null
null
null
math.AT math.AC
null
Let (R, m) be a local commutative ring. Suppose that m is principal and that m^2 = 0. We give a complete description of the cellular lattice of perfect chain complexes of modules over this ring.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:32:54 GMT" } ]
2008-01-28T00:00:00
[ [ "Kiessling", "Jonas", "" ] ]
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801.3905
Pushpa Khare
D.Vanden Berk, P.Khare, D.G.York, G.T.Richards, B.Lundgren, Y.Alsayyad, V.P.Kulkarni, M.SubbaRao, D.P.Schneider, T. Heckman, S.Anderson, A.P.S.Crotts, J. Frieman, C. Stoughton, J.T.Lauroesch, P.B.Hall, A.Meiksin, M. Steffing, J.Vanlandingham
Average Properties of a Large Sample of z_abs ~ z_em associated Mg II Absorption Line Systems
Accepted for publication in ApJ
Astrophys.J.679:239-259,2008
10.1086/587122
null
astro-ph
null
We have studied a sample of 415 associated (z_ab z_em; relative velocity with respect to QSO <3000km/s) Mg II absorption systems with 1.0<=z_ab<=1.86, in the spectra of SDSS DR3 QSOs, to determine the dust content and ionization state in the absorbers. We studied the dependence of these properties on the properties of the QSOs and also, compared the properties with those of a similarly selected sample of 809 intervening systems (apparent relative velocity with respect to the QSO of >3000km/s), so as to understand their origin. From the analysis of the composite spectra, as well as from the comparison of measured equivalent widths in individual spectra, we conclude that the associated Mg II absorbers have higher apparent ionization, measured by the strength of the C IV absorption lines compared to the Mg II absorption lines, than the intervening absorbers. The ionization so measured appears to be related to apparent ejection velocity, being lower as the apparent ejection velocity is more and more positive. There is clear evidence, from the composite spectra, for SMC like dust attenuation in these systems; the 2175AA absorption feature is not present. The extinction is almost twice that observed in the similarly selected sample of intervening systems. We reconfirm that QSOs with non-zero FIRST radio flux are intrinsically redder than the QSOs with no detection in the FIRST survey. The incidence of associated Mg II systems in QSOs with non-zero FIRST radio flux is 1.7 times that in the QSOs with no detection in the FIRST survey. The associated absorbers in radio-detected QSOs which comprise about 12% of our sample, cause 3 times more reddening than the associated absorbers in radio-undetected QSOs. This excess reddening possibly suggests an intrinsic nature for the associated absorbers in radio-detected QSOs.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:06:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Berk", "D. Vanden", "" ], [ "Khare", "P.", "" ], [ "York", "D. G.", "" ], [ "Richards", "G. T.", "" ], [ "Lundgren", "B.", "" ], [ "Alsayyad", "Y.", "" ], [ "Kulkarni", "V. P.", "" ], [ "SubbaRao", "M.", "" ], [ "Schneider", "D. P.", "" ], [ "Heckman", "T.", "" ], [ "Anderson", "S.", "" ], [ "Crotts", "A. P. S.", "" ], [ "Frieman", "J.", "" ], [ "Stoughton", "C.", "" ], [ "Lauroesch", "J. T.", "" ], [ "Hall", "P. B.", "" ], [ "Meiksin", "A.", "" ], [ "Steffing", "M.", "" ], [ "Vanlandingham", "J.", "" ] ]
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801.3906
Julien Donini
Julien Donini, Tommaso Dorigo, Kenichi Hatakeyama, Shawn Kwang, Christopher Neu, Melvyn Shochet, Tomonobu Tomura, Mia Tosi, Daniel Whiteson
Energy Calibration of b-Quark Jets with Z->b-bbar Decays at the Tevatron Collider
35 pages, 9 figures, submitted to Nuclear Instruments and Methods in Physics Research Section A
Nucl.Instrum.Meth.A596:354-367,2008
10.1016/j.nima.2008.08.133
null
hep-ex
null
The energy measurement of jets produced by b-quarks at hadron colliders suffers from biases due to the peculiarities of the hadronization and decay of the originating B hadron. The impact of these effects can be estimated by reconstructing the mass of Z boson decays into pairs of b-quark jets. From a sample of 584 pb-1 of data collected by the CDF experiment in 1.96 TeV proton-antiproton collisions at the Tevatron collider, we show how the Z signal can be identified and measured. Using the reconstructed mass of Z candidates we determine a jet energy scale factor for b-quark jets with a precision better than 2%. This measurement allows a reduction of one of the dominant source of uncertainty in analyses based on high transverse momentum b-quark jets. We also determine, as a cross-check of our analysis, the Z boson cross section in hadronic collisions using the b-bbar final state as sigma x B(Z->b-bbar) = 1578 +636 -410 pb.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:10:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Donini", "Julien", "" ], [ "Dorigo", "Tommaso", "" ], [ "Hatakeyama", "Kenichi", "" ], [ "Kwang", "Shawn", "" ], [ "Neu", "Christopher", "" ], [ "Shochet", "Melvyn", "" ], [ "Tomura", "Tomonobu", "" ], [ "Tosi", "Mia", "" ], [ "Whiteson", "Daniel", "" ] ]
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801.3907
Giancarlo Ferrera
Giancarlo Ferrera (Florence U. and INFN Florence), Jaume Guasch (Barcelona U., DFF and ICC Barcelona U.), David Lopez-Val (Barcelona U., ECM), Joan Sola (Barcelona U., ECM and ICC Barcelona U.)
Triple Higgs boson production at the ILC within a generic Two-Higgs-Doublet Model
5 pages, 1 figure. To appear in the proceedings of the "8th International Symposium on Radiative Corrections (RADCOR 2007)", October 1-5 2007, Florence, Italy
PoSRADCOR2007:043,2007
null
UB-ECM-PF-08-02
hep-ph
null
We present a study of triple Higgs boson (3H) production at the International Linear Collider (ILC) within the general Two-Higgs-Doublet Model (2HDM). We compute the production cross-sections at the leading-order for the 3H final states and find values up to sigma ~ 0.1 pb. This result represents a large enhancement with respect to the corresponding MSSM cross-sections, which stay typically at the level of sigma ~ 10^(-6) pb or less. Furthermore, since the 3H cross-sections in the general 2HDM can be of the order of the double Higgs production cross-sections, such 3H processes could be a competitive (if not the dominant) mechanism for Higgs boson production at the ILC. In practice, these 3H events could be identified through the tagging of 6 heavy-quark jet final states and, in this case, they would provide strong evidence of an extended Higgs boson sector -- likely of non-supersymmetric nature.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:14:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Ferrera", "Giancarlo", "", "Florence U. and INFN Florence" ], [ "Guasch", "Jaume", "", "Barcelona U., DFF and ICC Barcelona U." ], [ "Lopez-Val", "David", "", "Barcelona U.,\n ECM" ], [ "Sola", "Joan", "", "Barcelona U., ECM and ICC Barcelona U." ] ]
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801.3908
Jakob Vo{\ss}
Jakob Voss
Encoding changing country codes for the Semantic Web with ISO 3166 and SKOS
Accepted to appear in the proceedings of the 2nd International Con- ference on Metadata and Semantics Research (MTSR 2007)
null
null
null
cs.IR
null
This paper shows how authority files can be encoded for the Semantic Web with the Simple Knowledge Organisation System (SKOS). In particular the application of SKOS for encoding the structure, management, and utilization of country codes as defined in ISO 3166 is demonstrated. The proposed encoding gives a use case for SKOS that includes features that have only been discussed little so far, such as multiple notations, nested concept schemes, changes by versioning.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:40:27 GMT" } ]
2008-01-28T00:00:00
[ [ "Voss", "Jakob", "" ] ]
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801.3909
N. I. Stoilova
N.I. Stoilova and J. Van der Jeugt
Parafermions, parabosons and representations of so(\infty) and osp(1|\infty)
null
Int.J.Math.20:693-715,2009
10.1142/S0129167X09005467
null
hep-th math-ph math.GR math.MP math.RT quant-ph
null
The goal of this paper is to give an explicit construction of the Fock spaces of the parafermion and the paraboson algebra, for an infinite set of generators. This is equivalent to constructing certain unitary irreducible lowest weight representations of the (infinite rank) Lie algebra so(\infty) and of the Lie superalgebra osp(1|\infty). A complete solution to the problem is presented, in which the Fock spaces have basis vectors labelled by certain infinite but stable Gelfand-Zetlin patterns, and the transformation of the basis is given explicitly. We also present expressions for the character of the Fock space representations.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:43:12 GMT" } ]
2009-08-24T00:00:00
[ [ "Stoilova", "N. I.", "" ], [ "Van der Jeugt", "J.", "" ] ]
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801.391
Ravi Subrahmanyan
Ravi Subrahmanyan, Lakshmi Saripalli, Vicky Safouris and Richard W. Hunstead
On the relationship between a giant radio galaxy MSH 05-22 and the ambient large-scale galaxy structure
27 pages including 1 table and 13 figures. To appear in ApJ
null
10.1086/529007
null
astro-ph
null
We present a comparison of the properties of a giant radio galaxy and the ambient intergalactic medium, whose properties are inferred from the large-scale distribution in galaxies. The double lobes of the radio galaxy MSH 05-22 are giant--1.8 Mpc projected linear size--and interacting with the environment outside the interstellar medium and coronal halo associated with the host galaxy. The radio lobes appear to be relicts and the double structure is asymmetric. We have examined the large-scale structure in the galaxy distribution surrounding the radio source. The host galaxy of MSH 05-22 is associated with a small group that lies close to the boundary of sheet-like and filamentary density enhancements, and adjacent to a void. Assuming that the galaxies trace gas, the asymmetries in the radio morphology in this case study appear related to the anisotropy in the medium. However, the observed overdensities and structure formation models for the heating of the intergalactic medium (IGM) suggest a density-temperature product for the IGM environment that is an order of magnitude below that expected from the properties of the radio source. The discordance suggests that even sources like MSH 05-22, which are observed in the relatively low-density IGM environment associated with the filamentary large-scale structure and have multiple signatures of being relicts, may be overpressured and evolving towards an equilibrium relaxed state with the ambient IGM. Alternately, it is speculated that astrophysical feedback originating in galaxy overdensities observed 1-2 Mpc to the N and NE of MSH 05-22 might be the mechanism for the heating of the ambient IGM gas.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:44:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Subrahmanyan", "Ravi", "" ], [ "Saripalli", "Lakshmi", "" ], [ "Safouris", "Vicky", "" ], [ "Hunstead", "Richard W.", "" ] ]
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801.3911
Shoulan Gao
Shoulan Gao, Cuipo Jiang and Yufeng Pei
The derivations, central extensions and automorphism group of the Lie algebra $W$
10 pages
null
null
null
math.RA math.GM
null
In this paper, we study the derivations, central extensions and the automorphisms of the infinite-dimensional Lie algebra W which appeared in [8] and Dong-Zhang's recent work [22] on the classification of some simple vertex operator algebras.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:50:08 GMT" } ]
2008-01-28T00:00:00
[ [ "Gao", "Shoulan", "" ], [ "Jiang", "Cuipo", "" ], [ "Pei", "Yufeng", "" ] ]
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801.3912
Olivier Finkel
Olivier Carton (LIAFA), Olivier Finkel (LIP), Pierre Simonnet (SPE)
On the Continuity Set of an omega Rational Function
Dedicated to Serge Grigorieff on the occasion of his 60th Birthday
Theoretical Informatics and Applications (1), 42 (2008) 183-196
null
null
cs.CC cs.LO
null
In this paper, we study the continuity of rational functions realized by B\"uchi finite state transducers. It has been shown by Prieur that it can be decided whether such a function is continuous. We prove here that surprisingly, it cannot be decided whether such a function F has at least one point of continuity and that its continuity set C(F) cannot be computed. In the case of a synchronous rational function, we show that its continuity set is rational and that it can be computed. Furthermore we prove that any rational Pi^0_2-subset of X^omega for some alphabet X is the continuity set C(F) of an omega-rational synchronous function F defined on X^omega.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:54:05 GMT" } ]
2008-01-28T00:00:00
[ [ "Carton", "Olivier", "", "LIAFA" ], [ "Finkel", "Olivier", "", "LIP" ], [ "Simonnet", "Pierre", "", "SPE" ] ]
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801.3913
Jure Dobnikar
J. Dobnikar, D. Halo\v{z}an, M. Brumen, H.-H. von Gr\"unberg, and R. Rzehak
Poisson -- Boltzmann Brownian Dynamics of Charged Colloids in Suspension
null
Computer Phys. Comm. 159 (2), 73-92 (2004)
10.1016/j.cpc.2003.10.001
null
cond-mat.soft
null
We describe a method to simulate the dynamics of charged colloidal particles suspended in a liquid containing dissociated ions and salt ions. Regimes of prime current interest are those of large volume fraction of colloids, highly charged particles and low salt concentrations. A description which is tractable under these conditions is obtained by treating the small dissociated and salt ions as continuous fields, while keeping the colloidal macroions as discrete particles. For each spatial configuration of the macroions, the electrostatic potential arising from all charges in the system is determined by solving the nonlinear Poisson--Boltzmann equation. From the electrostatic potential, the forces acting on the macroions are calculated and used in a Brownian dynamics simulation to obtain the motion of the latter. The method is validated by comparison to known results in a parameter regime where the effective interaction between the macroions is of a pairwise Yukawa form.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:57:45 GMT" } ]
2008-01-28T00:00:00
[ [ "Dobnikar", "J.", "" ], [ "Haložan", "D.", "" ], [ "Brumen", "M.", "" ], [ "von Grünberg", "H. -H.", "" ], [ "Rzehak", "R.", "" ] ]
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801.3914
ChiYung Yam
ChiYung Yam, Yan Mo, Fan Wang, Xiaobo Li, GuanHua Chen, Xiao Zheng, Yuki Matsuda, Jamil Tahir-Kheli, and William A. Goddard III
Equivalent electric circuit of a carbon nanotube based molecular conductor
10 pages, 4 figures
null
null
null
physics.chem-ph physics.comp-ph
null
We apply our first-principles method to simulate the transient electrical response through carbon nanotube based conductors under time-dependent bias voltages, and report the dynamic conductance for a specific system. We find that the electrical response of the carbon nanotube device can be mapped onto an equivalent classical electric circuit. This is confirmed by studying the electric response of a simple model system and its equivalent circuit.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 10:58:13 GMT" } ]
2008-01-28T00:00:00
[ [ "Yam", "ChiYung", "" ], [ "Mo", "Yan", "" ], [ "Wang", "Fan", "" ], [ "Li", "Xiaobo", "" ], [ "Chen", "GuanHua", "" ], [ "Zheng", "Xiao", "" ], [ "Matsuda", "Yuki", "" ], [ "Tahir-Kheli", "Jamil", "" ], [ "Goddard", "William A.", "III" ] ]
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801.3915
Jean-Yves Ollitrault
Ante Bilandzic, Naomi van der Kolk, Jean-Yves Ollitrault, Raimond Snellings
Event-plane flow analysis without non-flow effects
8 pages. Extended revision: Section II rewritten
Phys.Rev.C83:014909,2011
10.1103/PhysRevC.83.014909
Saclay t08/020
nucl-ex nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The event-plane method, which is widely used to analyze anisotropic flow in nucleus-nucleus collisions, is known to be biased by nonflow effects,especially at high $p_t$. Various methods (cumulants, Lee-Yang zeroes) have been proposed to eliminate nonflow effects, but their implementation is tedious, which has limited their application so far. In this paper, we show that the Lee-Yang-zeroes method can be recast in a form similar to the standard event-plane analysis. Nonflow correlations are strongly suppressed by using the information from the length of the flow vector, in addition to the event-plane angle. This opens the way to improved analyses of elliptic flow and azimuthally-sensitive observables at RHIC and LHC.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:55:40 GMT" }, { "version": "v2", "created": "Thu, 20 Jan 2011 14:34:21 GMT" } ]
2015-03-13T00:00:00
[ [ "Bilandzic", "Ante", "" ], [ "van der Kolk", "Naomi", "" ], [ "Ollitrault", "Jean-Yves", "" ], [ "Snellings", "Raimond", "" ] ]
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801.3916
Jure Dobnikar
J. Dobnikar, Y. Chen, R. Rzehak, and H.H. von Gr\"unberg
Many-body interactions and melting of colloidal crystals
null
J. Chem. Phys. 119 (9) 4971 (2003)
10.1063/1.1595642
null
cond-mat.soft
null
We study the melting behavior of charged colloidal crystals, using a simulation technique that combines a continuous mean-field Poisson-Boltzmann description for the microscopic electrolyte ions with a Brownian-dynamics simulation for the mesoscopic colloids. This technique ensures that many-body interactions between the colloids are fully taken into account, and thus allows us to investigate how many-body interactions affect the solid-liquid phase behavior of charged colloids. Using the Lindemann criterion, we determine the melting line in a phase-diagram spanned by the colloidal charge and the salt concentration. We compare our results to predictions based on the established description of colloidal suspensions in terms of pairwise additive Yukawa potentials, and find good agreement at high-salt, but not at low-salt concentration. Analyzing the effective pair-interaction between two colloids in a crystalline environment, we demonstrate that the difference in the melting behavior observed at low salt is due to many-body interactions.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 11:07:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Dobnikar", "J.", "" ], [ "Chen", "Y.", "" ], [ "Rzehak", "R.", "" ], [ "von Grünberg", "H. H.", "" ] ]
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801.3917
Jure Dobnikar
M. Brunner, J. Dobnikar, H.H. von Gr\"unberg, and C. Bechinger
Direct measurement of three-body interactions
null
Phys.Rev. Lett. 92 (7), 078301 (2004)
10.1103/PhysRevLett.92.078301
null
cond-mat.soft
null
Three-body interactions have been measured among three charged colloidal particles in deionized solvent. Two of the particles have been confined to an optical line-trap while the third one was approached by means of a focused laser beam. The experimentally determined three-body interactions are attractive and roughly of the same magnitude and range as the pair-interactions. In addition, numerical calculations have been performed, which show good agreement with the experimental results.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 11:19:35 GMT" } ]
2008-01-28T00:00:00
[ [ "Brunner", "M.", "" ], [ "Dobnikar", "J.", "" ], [ "von Grünberg", "H. H.", "" ], [ "Bechinger", "C.", "" ] ]
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801.3918
Amine Asselah
Amine Asselah
On large intersection and self-intersection local times in dimension five or more
16 pages
null
null
null
math.PR math-ph math.MP
null
We show a remarkable similarity between strategies to realize a large intersection or self-intersection local times in dimension five or more. This leads to the same rate functional for large deviation principles for the two objects obtained respectively by Chen and Morters, and by the present author. We also present a new estimate for the distribution of high level sets for a random walk, with application to the geometry of the intersection set of two high level sets of the local times of two independent random walks.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 11:17:49 GMT" } ]
2008-01-28T00:00:00
[ [ "Asselah", "Amine", "" ] ]
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801.3919
Lara Faoro
Lara Faoro, Alexei Kitaev and Lev B. Ioffe
Quasiparticle poisoning and Josephson current fluctuations induced by Kondo impurities
5 pages, 1 figure
null
10.1103/PhysRevLett.101.247002
null
cond-mat.mes-hall
null
We introduce a toy model that allows us to study the physical properties of a spin impurity coupled to the electrons in the superconducting island. We show that when the coupling of the spin is of the order of the superconducting gap two almost degenerate subgap states are formed. By computing the Berry phase that is associated with the superconducting phase rotations in this model, we prove that these subgap states are characterized by a different charge and demonstrate that the switching between these states has the same effect as quasiparticle poisoning (unpoisoning) of the island. We also show that an impurity coupled to both the island and the lead generates Josepshon current fluctuations.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 11:30:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Faoro", "Lara", "" ], [ "Kitaev", "Alexei", "" ], [ "Ioffe", "Lev B.", "" ] ]
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801.392
Jure Dobnikar
J. Dobnikar, M. Brunner, J\"org Baumgartl, H.H. von Gr\"unberg, and C. Bechinger
Three- and four-body interactions in colloidal systems
null
Proceedings of SPIE 5514 p.340-351 (2004)
10.1117/12.554610
null
cond-mat.soft
null
Three-body and four-body interactions have been directly measured in a colloidal system comprised of three (or four) charged colloidal particles. Two of the particles have been confined by means of a scanned laser tweezers to a line-shaped optical trap where they diffused due to thermal fluctuations. By means of an additional focused optical trap a third particle has been approached and attractive three-body interactions have been observed. These observations are in qualitative agreement with additionally performed nonlinear Poissson-Boltzmann calculations. Two configurations of four particles have been studied experimentally as well and in both cases a repulsive four-body interaction term has been observed.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 11:35:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Dobnikar", "J.", "" ], [ "Brunner", "M.", "" ], [ "Baumgartl", "Jörg", "" ], [ "von Grünberg", "H. H.", "" ], [ "Bechinger", "C.", "" ] ]
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801.3921
Joao Faria Martins
Jo\~ao Faria Martins
The Fundamental Crossed Module of the Complement of a Knotted Surface
A perfected version will appear in Transactions of the American Mathematical Society
Trans. Amer. Math. Soc. 361 (2009), 4593-4630
10.1090/S0002-9947-09-04576-0
null
math.GT hep-th math.QA
null
We prove that if $M$ is a CW-complex and $M^1$ is its 1-skeleton then the crossed module $\Pi_2(M,M^1)$ depends only on the homotopy type of $M$ as a space, up to free products, in the category of crossed modules, with $\Pi_2(D^2,S^1)$. From this it follows that, if $G$ is a finite crossed module and $M$ is finite, then the number of crossed module morphisms $\Pi_2(M,M^1) \to G$ can be re-scaled to a homotopy invariant $I_G(M)$, depending only on the homotopy 2-type of $M$. We describe an algorithm for calculating $\pi_2(M,M^{(1)})$ as a crossed module over $\pi_1(M^{(1)})$, in the case when $M$ is the complement of a knotted surface $\Sigma$ in $S^4$ and $M^{(1)}$ is the handlebody made from the 0- and 1-handles of a handle decomposition of $M$. Here $\Sigma$ is presented by a knot with bands. This in particular gives us a geometric method for calculating the algebraic 2-type of the complement of a knotted surface from a hyperbolic splitting of it. We prove in addition that the invariant $I_G$ yields a non-trivial invariant of knotted surfaces in $S^4$ with good properties with regards to explicit calculations.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:21:10 GMT" } ]
2017-05-23T00:00:00
[ [ "Martins", "João Faria", "" ] ]
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801.3922
Jure Dobnikar
J. Dobnikar, M. Brunner, H.H. von Gr\"unberg, and C. Bechinger
Three-body interactions in colloidal systems
null
Phys.Rev. E 69 (3) 031402 (2004)
10.1103/PhysRevE.69.031402
null
cond-mat.soft
null
We present the first direct measurement of three-body interactions in a colloidal system comprised of three charged colloidal particles. Two of the particles have been confined by means of a scanned laser tweezers to a line-shaped optical trap where they diffused due to thermal fluctuations. Upon the approach of a third particle, attractive three-body interactions have been observed. The results are in qualitative agreement with additionally performed nonlinear Poissson-Boltzmann calculations, which also allow us to investigate the microionic density distributions in the neighborhood of the interacting colloidal particles.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:31:50 GMT" } ]
2008-01-28T00:00:00
[ [ "Dobnikar", "J.", "" ], [ "Brunner", "M.", "" ], [ "von Grünberg", "H. H.", "" ], [ "Bechinger", "C.", "" ] ]
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801.3923
Thanos Manos
T. Manos, Ch. Skokos and T. Bountis
Global dynamics of coupled standard maps
4 pages, 3 figures, to appear in the proceedings of the international conference "Chaos in Astronomy", Athens, Greece (poster contribution)
Chaos in Astronomy Astrophysics and Space Science Proceedings 2009, pp 367-371
10.1007/978-3-540-75826-6_38
null
nlin.CD
null
Understanding the dynamics of multi--dimensional conservative dynamical systems (Hamiltonian flows or symplectic maps) is a fundamental issue of non-linear science. The Generalized ALignment Index (GALI), which was recently introduced and applied successfully for the distinction between regular and chaotic motion in Hamiltonian systems \cite{sk:6}, is an ideal tool for this purpose. In the present paper we make a first step towards the dynamical study of multi--dimensional maps, by obtaining some interesting results for a 4--dimensional (4D) symplectic map consisting of N=2 coupled standard maps \cite{Kan:1}. In particular, using the new GALI$_3$ and GALI$_4$ indices, we compute the percentages of regular and chaotic motion of the map equally reliably but much faster than previously used indices, like GALI$_2$ (known in the literature as SALI).
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:02:38 GMT" } ]
2013-03-26T00:00:00
[ [ "Manos", "T.", "" ], [ "Skokos", "Ch.", "" ], [ "Bountis", "T.", "" ] ]
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801.3924
Jaap-Henk Hoepman
Jaap-Henk Hoepman, Bart Jacobs
Increased security through open source
null
Communications of the ACM, 50(1):79-83, 2007
null
null
cs.CR cs.CY cs.SE
null
In this paper we discuss the impact of open source on both the security and transparency of a software system. We focus on the more technical aspects of this issue, combining and extending arguments developed over the years. We stress that our discussion of the problem only applies to software for general purpose computing systems. For embedded systems, where the software usually cannot easily be patched or upgraded, different considerations may apply.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:06:48 GMT" } ]
2021-08-23T00:00:00
[ [ "Hoepman", "Jaap-Henk", "" ], [ "Jacobs", "Bart", "" ] ]
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801.3925
Changxing Miao
Changxing Miao, Guixiang Xu and Lifeng Zhao
Global well-posedness and scattering for the mass-critical Hartree equation with radial data
38 pages, 1 figure
J.Math.Pures Appl.91(2009)49-79
10.1016/j.matpur.2008.09.003
null
math.AP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish global well-posedness and scattering for solutions to the mass-critical nonlinear Hartree equation $iu_t+\Delta u=\pm(|x|^{-2}*|u|^2)u$ for large spherically symmetric $L^2_x(\Bbb{R}^d)$ initial data; in the focusing case we require, of course, that the mass is strictly less than that of the ground state.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:07:22 GMT" }, { "version": "v2", "created": "Fri, 26 Dec 2008 12:43:03 GMT" } ]
2009-01-11T00:00:00
[ [ "Miao", "Changxing", "" ], [ "Xu", "Guixiang", "" ], [ "Zhao", "Lifeng", "" ] ]
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801.3926
Cen Jung Tjhai
C. Tjhai, M. Tomlinson, M. Ambroze and M. Ahmed
On the Weight Distribution of the Extended Quadratic Residue Code of Prime 137
Post-print of 7th International ITG Conference on Source and Channel Coding, Ulm, 14--16 January 2008
null
null
null
cs.IT cs.DM math.IT
null
The Hamming weight enumerator function of the formally self-dual even, binary extended quadratic residue code of prime p = 8m + 1 is given by Gleason's theorem for singly-even code. Using this theorem, the Hamming weight distribution of the extended quadratic residue is completely determined once the number of codewords of Hamming weight j A_j, for 0 <= j <= 2m, are known. The smallest prime for which the Hamming weight distribution of the corresponding extended quadratic residue code is unknown is 137. It is shown in this paper that, for p=137 A_2m = A_34 may be obtained with out the need of exhaustive codeword enumeration. After the remainder of A_j required by Gleason's theorem are computed and independently verified using their congruences, the Hamming weight distributions of the binary augmented and extended quadratic residue codes of prime 137 are derived.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:14:22 GMT" } ]
2008-01-28T00:00:00
[ [ "Tjhai", "C.", "" ], [ "Tomlinson", "M.", "" ], [ "Ambroze", "M.", "" ], [ "Ahmed", "M.", "" ] ]
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801.3927
Eric Stempels
H. C. Stempels, L. Hebb, K. G. Stassun, J. Holtzman, N. Dunstone, L. Glowienka and S. Frandsen
The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5
9 pages, 8 figures, to appear in A&A
null
10.1051/0004-6361:20078585
null
astro-ph
null
In this paper we present the first results of a detailed spectroscopic and photometric analysis of the V = 11.7m eclipsing binary ASAS J052821+0338.5. With the FIES spectrograph at the Nordic Optical Telescope we have obtained a series of high-resolution spectra (R=47000) covering the entire orbit of the system. In addition we obtained simultaneous broadband photometry from three small aperture telescopes. From these spectroscopic and photometric data we have derived the system's orbital parameters and determined the fundamental stellar parameters of the two components. Our results indicate that ASAS J052821+0338.5 is a K1/K3 pre-main-sequence eclipsing binary, with component masses of 1.38 M_sun and 1.33 M_sun and a period of 3.87 days, located at a distance of 280 +/- 30 pc. The kinematics, physical location and the evolutionary status of the two stars suggest that ASAS J052821+0338.5 is a member of the approximately 11 Myr old Orion OB1a subassociation. The systems also exhibits smooth 0.15m out-of-eclipse variations that are similar to those found in RS CVn binaries. Furthermore the parameters we derived are consistent with the 10-13 Myr isochrones of the popular Baraffe stellar evolutionary models.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:23:52 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 19:50:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Stempels", "H. C.", "" ], [ "Hebb", "L.", "" ], [ "Stassun", "K. G.", "" ], [ "Holtzman", "J.", "" ], [ "Dunstone", "N.", "" ], [ "Glowienka", "L.", "" ], [ "Frandsen", "S.", "" ] ]
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801.3928
Ana Vasile
Lucia Aurelia Popa and Ana Vasile
Constraints on the lepton asymmetry and radiation energy density: Implications for PLANCK
15 pages, 6 figures; This work has been done on behalf of PLANCK-LFI activities
Rom.Rep.Phys.61:531-545,2009
null
null
astro-ph
null
By using most of the present CMB and LSS measurements and the BBN constraints on the primordial helium abundance, Y_p, we set bounds on the radiation content of the Universe and neutrino properties. We consider lepton asymmetric cosmological models parametrized by the neutrino degeneracy parameter \xi_{\nu} and the variation of the relativistic degrees of freedom, \Delta N_{oth}^{eff}, due to possible other physical processes that occurred between BBN and structure formation epoch. We found that present CMB and LSS data constraints the neutrino degeneracy parameter at \xi_{\nu} \leq 0.722, implying a lepton asymmetry of the neutrino background {\cal L}_{\nu} \leq 0.614 (2-\sigma). We also found \Delta N^{eff}_{oth}=0.572^{+1.972}_{-1.780}, the contribution to the effective number of relativistic neutrino species N^{eff}=3.058^{+1.971}_{-1.178} and a primordial helium abundance Y_p=0.249^{+0.014}_{-0.016} (2-\sigma errors). These results bring an important improvement over the similar ones obtained by using WMAP~1-year and older LSS data or the WMAP~3-year data alone and the standard primordial helium abundance value Y_p=0.24, relaxing the stringent BBN constraint on the neutrino degeneracy parameter (\xi_{\nu} \leq 0.07). We forecast that the CMB temperature and polarization maps observed with high angular resolutions and sensitivity by the future Planck Mission will constraint the primordial primordial helium abundance at Y_p=0.247 \pm 0.002 (2-\sigma errors) in agreement with the most stringent limits on Y_p given by the BBN and the neutrino degeneracy parameter at \xi_{\nu} \leq 0.280 (2-\sigma), not excluding the possibility of larger lepton asymmetry. This work has been done on behalf of Planck-LFI activities.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 13:10:08 GMT" } ]
2010-02-26T00:00:00
[ [ "Popa", "Lucia Aurelia", "" ], [ "Vasile", "Ana", "" ] ]
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801.3929
Janez Mrcun
I. Moerdijk, J. Mrcun
On the universal enveloping algebra of a Lie-Rinehart algebra
null
published as: On the universal enveloping algebra of a Lie algebroid. Proc. Amer. Math. Soc. 138 (2010) 3135-3145
null
null
math.QA math.DG math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review the extent to which the universal enveloping algebra of a Lie-Rinehart algebra resembles a Hopf algebra, and refer to this structure as a Rinehart bialgebra. We then prove a Cartier-Milnor-Moore type theorem for such Rinehart bialgebras.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:17:23 GMT" }, { "version": "v2", "created": "Mon, 23 Jun 2008 08:40:35 GMT" } ]
2012-11-01T00:00:00
[ [ "Moerdijk", "I.", "" ], [ "Mrcun", "J.", "" ] ]
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801.393
Jaap-Henk Hoepman
Jaap-Henk Hoepman, Engelbert Hubbers, Bart Jacobs, Martijn Oostdijk, Ronny Wichers Schreur
Crossing Borders: Security and Privacy Issues of the European e-Passport
null
1st Int. Workshop on Security, LNCS 4266, pages 152-167, Kyoto, Japan, October 23-24 2006
null
null
cs.CR cs.CY
null
The first generation of European e-passports will be issued in 2006. We discuss how borders are crossed regarding the security and privacy erosion of the proposed schemes, and show which borders need to be crossed to improve the security and the privacy protection of the next generation of e-passports. In particular we discuss attacks on Basic Access Control due to the low entropy of the data from which the access keys are derived, we sketch the European proposals for Extended Access Control and the weaknesses in that scheme, and show how fundamentally different design decisions can make e-passports more secure.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:17:52 GMT" } ]
2008-01-28T00:00:00
[ [ "Hoepman", "Jaap-Henk", "" ], [ "Hubbers", "Engelbert", "" ], [ "Jacobs", "Bart", "" ], [ "Oostdijk", "Martijn", "" ], [ "Schreur", "Ronny Wichers", "" ] ]
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801.3931
Thanos Manos
T.Manos and E. Athanassoula
Dynamical study of 2D and 3D barred galaxy models
8 pages, 3 figures, to appear in the proceedings of the international conference "Chaos in Astronomy", Athens, Greece (talk contribution)
Chaos in Astronomy Astrophysics and Space Science Proceedings 2009, pp 115-122
10.1007/978-3-540-75826-6_11
null
astro-ph
null
We study the dynamics of 2D and 3D barred galaxy analytical models, focusing on the distinction between regular and chaotic orbits with the help of the Smaller ALigment Index (SALI), a very powerful tool for this kind of problems. We present briefly the method and we calculate the fraction of chaotic and regular orbits in several cases. In the 2D model, taking initial conditions on a Poincar\'{e} $(y,p_y)$ surface of section, we determine the fraction of regular and chaotic orbits. In the 3D model, choosing initial conditions on a cartesian grid in a region of the $(x, z, p_y)$ space, which in coordinate space covers the inner disc, we find how the fraction of regular orbits changes as a function of the Jacobi constant. Finally, we outline that regions near the $(x,y)$ plane are populated mainly by regular orbits. The same is true for regions that lie either near to the galactic center, or at larger relatively distances from it.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:19:24 GMT" } ]
2013-03-26T00:00:00
[ [ "Manos", "T.", "" ], [ "Athanassoula", "E.", "" ] ]
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801.3932
Thomas Kaltenbrunner
Thomas Kaltenbrunner, Meinulf G\"ockeler and Andreas Sch\"afer
Irreducible Multiplets of Three-Quark Operators on the Lattice: Controlling Mixing under Renormalization
13 pages
Eur.Phys.J.C55:387-401,2008
10.1140/epjc/s10052-008-0596-4
null
hep-lat
null
High luminosity accelerators have greatly increased the interest in semi-exclusive and exclusive reactions involving nucleons. The relevant theoretical information is contained in the nucleon wavefunction and can be parametrized by moments of the nucleon distribution amplitudes, which in turn are linked to matrix elements of three-quark operators. These can be calculated from first principles in lattice QCD. However, on the lattice the problems of operator mixing under renormalization are rather involved. In a systematic approach we investigate this issue in depth. Using the spinorial symmetry group of the hypercubic lattice we derive irreducibly transforming three-quark operators, which allow us to control the mixing pattern.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:39:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Kaltenbrunner", "Thomas", "" ], [ "Göckeler", "Meinulf", "" ], [ "Schäfer", "Andreas", "" ] ]
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801.3933
Huan Wang
Huan Wang, Ka-Di Zhu
Voltage-Controlled Berry Phases in Two Coupled Quantum Dots
10 pages, 3 figures
null
10.1209/0295-5075/82/60006
null
cond-mat.mes-hall
null
The voltage-controlled Berry phases in two vertically coupled InGaAs/GaAs quantum dots are investigated theoretically. It is found that Berry phases can be changed dramatically from 0 to 2$\pi$ (or 2$\pi$ to 0) only simply by turning the external voltage. Under realistic conditions, as the tunneling is varied from $0.8eV$ to $0.9eV$ via a bias voltage, the Berry phases are altered obviously, which can be detected in an interference experiment. The scheme is expected to be useful in constructing quantum computation based on geometric phases in an asymmetrical double quantum dot controlled by voltage.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:27:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Huan", "" ], [ "Zhu", "Ka-Di", "" ] ]
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801.3934
Unjong Yu
Unjong Yu, Krzysztof Byczuk, and Dieter Vollhardt
Ferromagnetism and Kondo Insulator Behavior in the Disordered Periodic Anderson Model
5 pages, 3 figures
Phys. Rev. Lett. 100, 246401 (2008).
10.1103/PhysRevLett.100.246401
null
cond-mat.str-el
null
The effect of binary alloy disorder on the ferromagnetic phases of f-electron materials is studied within the periodic Anderson model. We find that disorder in the conduction band can drastically enhance the Curie temperature due to an increase of the local f-moment. The effect may be explained qualitatively and even quantitatively by a simple theoretical ansatz. The emergence of an alloy Kondo insulator at non-integer filling is also pointed out.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:52:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Yu", "Unjong", "" ], [ "Byczuk", "Krzysztof", "" ], [ "Vollhardt", "Dieter", "" ] ]
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801.3935
Markus Kowalewski
Caroline Gollub, Markus Kowalewski and Regina de Vivie-Riedle
Montonic convergent optimal control theory to modulate bandwidth limited laser pulses in linear and non-linear optical processes
4 pages, 3 figures
Phys. Rev. Lett. 101, 073002 (2008)
10.1103/PhysRevLett.101.073002
null
quant-ph
null
We present a modified optimal control scheme based on the Krotov method, which allows for strict limitations on the spectrum of the optimized laser fields, without losing monotonic convergence of the algorithm. The method guarantees a close link to learning loop control experiments and is demonstrated for the challenging control of non-resonant Raman transitions, which are used to implement a set of global quantum gates for molecular vibrational qubits.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:43:31 GMT" } ]
2008-08-18T00:00:00
[ [ "Gollub", "Caroline", "" ], [ "Kowalewski", "Markus", "" ], [ "de Vivie-Riedle", "Regina", "" ] ]
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801.3936
Jan \v{S}\v{t}ov\'i\v{c}ek
Jan Saroch and Jan Stovicek
The countable Telescope Conjecture for module categories
31 pages; minor changes, typos corrected, references added
Adv. Math. 219 (2008) 1002-1036
10.1016/j.aim.2008.05.012
null
math.RA
null
By the Telescope Conjecture for Module Categories, we mean the following claim: "Let R be any ring and (A, B) be a hereditary cotorsion pair in Mod-R with A and B closed under direct limits. Then (A, B) is of finite type." We prove a modification of this conjecture with the word 'finite' replaced by 'countable'. We show that a hereditary cotorsion pair (A, B) of modules over an arbitrary ring R is generated by a set of strongly countably presented modules provided that B is closed under unions of well-ordered chains. We also characterize the modules in B and the countably presented modules in A in terms of morphisms between finitely presented modules, and show that (A, B) is cogenerated by a single pure-injective module provided that A is closed under direct limits. Then we move our attention to strong analogies between cotorsion pairs in module categories and localizing pairs in compactly generated triangulated categories.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:43:44 GMT" }, { "version": "v2", "created": "Fri, 16 May 2008 11:21:37 GMT" } ]
2008-09-16T00:00:00
[ [ "Saroch", "Jan", "" ], [ "Stovicek", "Jan", "" ] ]
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801.3937
Hang Wong
Hang Wong and Zhi-De Chen
Density matrix renormalization group approach of the spin-boson model
6 pages, 7 figures
Phys. Rev. B 77, 174305 (2008)
10.1103/PhysRevB.77.174305
null
cond-mat.str-el
null
We propose a density matrix renormalization group approach to tackle a two-state system coupled to a bosonic bath with continuous spectrum. In this approach, the optimized phonon scheme is applied to several hundred phonon modes which are divided linearly among the spectrum. Although DMRG cannot resolve very small energy scales, the delocalized-localized transition points of the two-state system are extracted by the extrapolation of the flow diagram results. The phase diagram is compared with the numerical renormalization group results and shows good agreement in both Ohmic and sub-Ohmic cases.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:48:14 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 07:43:28 GMT" } ]
2008-05-31T00:00:00
[ [ "Wong", "Hang", "" ], [ "Chen", "Zhi-De", "" ] ]
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801.3938
Fernando Navarra
D.A. Foga\c{c}a, L.G. Ferreira Filho and F.S. Navarra
Sound waves and solitons in hot and dense nuclear matter
28 pages, 8 figures
null
10.1016/j.nuclphysa.2009.01.007
null
nucl-th
null
Assuming that nuclear matter can be treated as a perfect fluid, we study the propagation of perturbations in the baryon density. The equation of state is derived from a relativistic mean field model, which is a variant of the non-linear Walecka model. The expansion of the Euler and continuity equations of relativistic hydrodynamics around equilibrium configurations leads to differential equations for the density fluctuations. We solve them numerically for linear and spherical perturbations and follow the time evolution of the initial pulses. For linear perturbations we find single soliton solutions and solutions with one or more solitons followed by radiation. Depending on the equation of state a strong damping may occur. Spherical perturbations are strongly damped and almost do not propagate. We study these equations also for matter at finite temperature. Finally we consider the limiting case of shock wave formation.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:50:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Fogaça", "D. A.", "" ], [ "Filho", "L. G. Ferreira", "" ], [ "Navarra", "F. S.", "" ] ]
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801.3939
Thanasis Bouganis
Thanasis Bouganis
Special values of L-functions and false Tate curve extensions II
null
null
null
null
math.NT
null
In this paper we show how one can combine the p-adic Rankin-Selberg product construction of Hida with freeness results of Hecke modules of Wiles to establish interesting congruences between special values of L-functions. These congruences is a part of some deep conjectural congruences that follow from the work of Kato on the non-commutative Iwasawa theory of the false Tate curve extension.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 12:58:51 GMT" } ]
2008-01-28T00:00:00
[ [ "Bouganis", "Thanasis", "" ] ]
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801.394
Eleonora Alfinito Dr.
Eleonora Alfinito, Cecilia Pennetta, Lino Reggiani
Topological change and impedance spectrum of rat olfactory receptor I7: A comparative analysis with bovine rhodopsin and bacterior
6 pages, 8 figures
J. Appl. Phys. 105 084703 (2009)
10.1063/1.3100210
null
q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a theoretical investigation on possible selection of olfactory receptors (ORs) as sensing components of nanobiosensors. Accordingly, we generate the impedance spectra of the rat OR I7 in the native and activated state and analyze their differences. In this way, we connect the protein morphological transformation, caused by the sensing action, with its change of electrical impedance. The results are compared with those obtained by studying the best known protein of the GPCR family: bovine rhodopsin. Our investigations indicate that a change in morphology goes with a change in impedance spectrum mostly associated with a decrease of the static impedance up to about 60 % of the initial value, in qualitative agreement with existing experiments on rat OR I7. The predictiveness of the model is tested successfully for the case of recent experiments on bacteriorhodopsin. The present results point to a promising development of a new class of nanobiosensors based on the electrical properties of GPCR and other sensing proteins.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 13:27:51 GMT" }, { "version": "v2", "created": "Tue, 19 May 2009 08:20:58 GMT" } ]
2011-02-17T00:00:00
[ [ "Alfinito", "Eleonora", "" ], [ "Pennetta", "Cecilia", "" ], [ "Reggiani", "Lino", "" ] ]
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801.3941
M. B. N. Kouwenhoven
M.B.N. Kouwenhoven (1), R. de Grijs (1,2) ((1) University of Sheffield, (2) Chinese Academy of Sciences)
How do binaries affect the derived dynamical mass of a star cluster?
6 pages, 5 figures, to appear in ``Young Massive Star Clusters - Initial Conditions and Environments'', 2008, Astrophysics & Space Science, eds. E. Perez, R. de Grijs, R. M. Gonzalez Delgado
Astrophys.Space Sci.324:171-176,2009
10.1007/s10509-009-0123-6
null
astro-ph
null
The dynamical mass of a star cluster can be derived from the virial theorem, using the measured half-mass radius and line-of-sight velocity dispersion of the cluster. However, this dynamical mass may be a significant overestimation of the cluster mass if the contribution of the binary orbital motion is not taken into account. In these proceedings we describe the mass overestimation as a function of cluster properties and binary population properties, and briefly touch the issue of selection effects. We find that for clusters with a measured velocity dispersion of sigma > 10 km/s the presence of binaries does not affect the dynamical mass significantly. For clusters with sigma < 1 km/s (i.e., low-density clusters), the contribution of binaries to sigma is significant, and may result in a major dynamical mass overestimation. The presence of binaries may introduce a downward shift of Delta log(L/Mdyn) = 0.05-0.4 in the log(L/Mdyn) vs. age diagram.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 13:40:46 GMT" } ]
2009-12-04T00:00:00
[ [ "Kouwenhoven", "M. B. N.", "" ], [ "de Grijs", "R.", "" ] ]
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801.3942
Neven Bilic
Neven Bili\'c, Gary B. Tupper and Raoul D. Viollier
Ghost Condensate Busting
9 pages, minor corrections, a reference added, the discussion on consistency of the Thomas-Fermi approximation expanded, to appear in JCAP
JCAP0809:002,2008
10.1088/1475-7516/2008/09/002
null
gr-qc astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Applying the Thomas-Fermi approximation to renormalizable field theories, we construct ghost condensation models that are free of the instabilities associated with violations of the null-energy condition.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 13:46:52 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 14:06:29 GMT" }, { "version": "v3", "created": "Mon, 14 Jul 2008 11:24:43 GMT" }, { "version": "v4", "created": "Wed, 6 Aug 2008 15:35:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Bilić", "Neven", "" ], [ "Tupper", "Gary B.", "" ], [ "Viollier", "Raoul D.", "" ] ]
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801.3943
Vitaly Groppen
V. O. Groppen
Systems of energy emitting bodies and their properties
18 pages, 5 figures
null
null
null
math.DS math-ph math.MP
null
Proposed is system of consistent mathematical models describing physical laws of a system of energy emitting bodies in dynamics, relativity and nuclear physics. It is shown the use of developed models for the description of systems, consisting of stable as well as of radioactive bodies and permitting to improve the quality of predicting the binding energy of light stable nuclides using modified semi-empirical equation. Experimental verification of proposed approach with respect to some nuclei of the Periodic Table elements in the first approximation confirms its validity.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:45:11 GMT" }, { "version": "v2", "created": "Sat, 26 Jan 2008 10:27:10 GMT" } ]
2008-01-28T00:00:00
[ [ "Groppen", "V. O.", "" ] ]
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801.3944
Moira Chas
Moira Chas and Fabiana Krongold
An algebraic characterization of simple closed curves on surfaces with boundary
null
null
null
null
math.GT math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We characterize in terms of the Goldman Lie algebra which conjugacy classes in the fundamental group of a surface with non empty boundary are represented by simple closed curves. We prove the following: A non power conjugacy class X contains an embedded representative if and only if the Goldman Lie bracket of X with the third power of X is zero. The proof uses combinatorial group theory and Chas' combinatorial description of the bracket recast here in terms of an exposition of the Cohen-Lustig algorithm. Using results of Ivanov, Korkmaz and Luo there are corollaries characterizing which permutations of conjugacy classes are related to diffeomorphisms of the surfaces. The problem is motivated by a group theoretical statement from the sixties equivalent to the Poincare conjecture due to Jaco and Stallings and by a question of Turaev from the eighties. Our main theorem actually counts the minimal possible number of self-intersection points of representatives of a conjugacy class X in terms of the bracket of X with the third power of X.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:36:59 GMT" }, { "version": "v2", "created": "Wed, 18 Jun 2008 01:58:26 GMT" }, { "version": "v3", "created": "Wed, 17 Dec 2008 19:27:00 GMT" }, { "version": "v4", "created": "Fri, 30 Jan 2009 17:42:59 GMT" }, { "version": "v5", "created": "Tue, 29 Sep 2015 13:34:14 GMT" } ]
2015-09-30T00:00:00
[ [ "Chas", "Moira", "" ], [ "Krongold", "Fabiana", "" ] ]
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801.3945
Alexandre Zenchuk
A.I.Zenchuk and P.M.Santini
On the remarkable relations among PDEs integrable by the inverse spectral transform method, by the method of characteristics and by the Hopf-Cole transformation
30 pages
null
null
null
nlin.SI
null
We establish deep and remarkable connections among partial differential equations (PDEs) integrable by different methods: the inverse spectral transform method, the method of characteristics and the Hopf-Cole transformation. More concretely, 1) we show that the integrability properties (Lax pair, infinitely-many commuting symmetries, large classes of analytic solutions) of (2+1)-dimensional PDEs integrable by the Inverse Scattering Transform method ($S$-integrable) can be generated by the integrability properties of the (1+1)-dimensional matrix B\"urgers hierarchy, integrable by the matrix Hopf-Cole transformation ($C$-integrable). 2) We show that the integrability properties i) of $S$-integrable PDEs in (1+1)-dimensions, ii) of the multidimensional generalizations of the $GL(M,\CC)$ self-dual Yang Mills equations, and iii) of the multidimensional Calogero equations can be generated by the integrability properties of a recently introduced multidimensional matrix equation solvable by the method of characteristics. To establish the above links, we consider a block Frobenius matrix reduction of the relevant matrix fields, leading to integrable chains of matrix equations for the blocks of such a Frobenius matrix, followed by a systematic elimination procedure of some of these blocks. The construction of large classes of solutions of the soliton equations from solutions of the matrix B\"urgers hierarchy turns out to be intimately related to the construction of solutions in Sato theory. 3) We finally show that suitable generalizations of the block Frobenius matrix reduction of the matrix B\"urgers hierarchy generates PDEs exhibiting integrability properties in common with both $S$- and $C$- integrable equations.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:14:40 GMT" } ]
2008-01-28T00:00:00
[ [ "Zenchuk", "A. I.", "" ], [ "Santini", "P. M.", "" ] ]
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801.3946
Stephan Baier
Stephan Baier, Nathan Jones
A refined version of the Lang-Trotter Conjecture
10 pages, 3 figures
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $E$ be an elliptic curve defined over the rational numbers and $r$ a fixed integer. Using a probabilistic model consistent with the Chebotarev theorem for the division fields of $E$ and the Sato-Tate distribution, Lang and Trotter conjectured an asymptotic formula for the number of primes up to $x$ which have Frobenius trace equal to $r$, where $r$ is a {\it fixed} integer. However, as shown in this note, this asymptotic estimate cannot hold for {\it all} $r$ in the interval $|r|\le 2\sqrt{x}$ with a uniform bound for the error term, because an estimate of this kind would contradict the Chebotarev density theorem as well as the Sato-Tate conjecture. The purpose of this note is to refine the Lang-Trotter conjecture, by taking into account the "semicircular law", to an asymptotic formula that conjecturally holds for arbitrary integers $r$ in the interval $|r|\le 2\sqrt{x}$, with a uniform error term. We demonstrate consistency of our refinement with the Chebotarev theorem for a fixed division field, and with the Sato-Tate conjecture. We also present numerical evidence for the refined conjecture.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:19:47 GMT" }, { "version": "v2", "created": "Wed, 17 Sep 2008 12:14:02 GMT" }, { "version": "v3", "created": "Sun, 26 Oct 2008 19:33:20 GMT" } ]
2008-10-26T00:00:00
[ [ "Baier", "Stephan", "" ], [ "Jones", "Nathan", "" ] ]
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801.3947
Henk Vocks
Henk Vocks, Debabrata Panja, Gerard T. Barkema
Amplitude and Frequency Spectrum of Thermal Fluctuations of A Translocating RNA Molecule
Significantly expanded compared to previous version, 13 pages, 4 figures, to appear in J. Phys.: Condens. Matter
J. Phys.: Condens. Matter 21, 375105 (2009)
10.1088/0953-8984/21/37/375105
null
cond-mat.stat-mech cond-mat.soft physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a combination of theory and computer simulations, we study the translocation of an RNA molecule, pulled through a solid-state nanopore by an optical tweezer, as a method to determine its secondary structure. The resolution with which the elements of the secondary structure can be determined is limited by thermal fluctuations. We present a detailed study of these thermal fluctuations, including the frequency spectrum, and show that these rule out single-nucleotide resolution under the experimental conditions which we simulated. Two possible ways to improve this resolution are strong stretching of the RNA with a back-pulling voltage across the membrane, and stiffening of the translocated part of the RNA by biochemical means.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 19:46:11 GMT" }, { "version": "v2", "created": "Mon, 3 Aug 2009 19:25:06 GMT" } ]
2009-08-13T00:00:00
[ [ "Vocks", "Henk", "" ], [ "Panja", "Debabrata", "" ], [ "Barkema", "Gerard T.", "" ] ]
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801.3948
Phil Yoon
P. S. Yoon
Impact of Electric Current Fluctuations Arising from Power Supplies on Charged-Particle Beams
30 pages, 60 figures
null
null
null
physics.acc-ph
null
Electric current fluctuations are one type of unavoidable machine imperfections,and induce magnetic-field perturbations as a source of instabilities in accelerators. This paper presents measurement-based methodology of modeling the fluctuating electric current arising from the power system of Fermilab's Booster synchrotron to discuss the ramifications of the presence of ripple current and space-charge defocusing effects. We also present the method of generating stochastic noise and the measurement and analysis methods of ripple current and offending electromagnetic interferences residing in the Booster power system. This stochastic noise model, accompanied by a suite of beam diagnostic calculations, manifests that the fluctuating power-supply current, when coupled to space charge and impinging upon a beam, can substantially enhance beam degradation phenomena--such as emittance growth and halo formation--during the Booster injection period. With idealized and uniform charge-density distribution, fractional growth of rms emittances due to ripple current under space charge turn out to be about 8 ~ 9 % in both transverse planes over the injection period of 2.2 ms prior to beam acceleration.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 20:52:53 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 13:22:51 GMT" } ]
2008-03-18T00:00:00
[ [ "Yoon", "P. S.", "" ] ]
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801.3949
Hugo Looyestijn
Hugo Looyestijn and Stefan Vandoren
On NS5-brane instantons and volume stabilization
29 pages, 3 figures; statements about fields G^a made more precise, added some clarifications, typos corrected
JHEP 0804:024,2008
10.1088/1126-6708/2008/04/024
null
hep-th
null
We study general aspects of NS5-brane instantons in relation to the stabilization of the volume modulus in Calabi-Yau compactifications of type II strings with fluxes, and their orientifold versions. These instantons correct the Kahler potential and generically yield significant contributions to the scalar potential at intermediate values of string coupling constant and volume. Under suitable conditions they yield uplifting terms that allow for meta--stable de Sitter vacua.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:46:40 GMT" }, { "version": "v2", "created": "Sun, 27 Jan 2008 08:29:48 GMT" }, { "version": "v3", "created": "Wed, 20 Feb 2008 08:32:35 GMT" } ]
2014-11-18T00:00:00
[ [ "Looyestijn", "Hugo", "" ], [ "Vandoren", "Stefan", "" ] ]
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801.395
Antoine Bret
A. Bret
Filamentation instability in a quantum magnetized plasma
9 pages, 5 figures, to appear in Phys. Plasmas
null
10.1063/1.2844747
null
physics.plasm-ph physics.space-ph
null
The filamentation instability occurring when a non relativistic electron beam passes through a quantum magnetized plasma is investigated by means of a cold quantum magnetohydrodynamic model. It is proved that the instability can be completely suppressed by quantum effects if and only if a finite magnetic field is present. A dimensionless parameter is identified which measures the strength of quantum effects. Strong quantum effects allow for a much smaller magnetic field to suppress the instability than in the classical regime.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:47:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Bret", "A.", "" ] ]
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801.3951
Fredrik Str\"omberg
Dieter Mayer and Fredrik Str\"omberg
Symbolic dynamics for the geodesic flow on Hecke surfaces
42 pages, 10 figures
null
null
null
math.DS
null
In this paper we discuss a coding and the associated symbolic dynamics for the geodesic flow on Hecke triangle surfaces. We construct an explicit cross section for which the first return map factors through a simple (explicit) map given in terms of the generating map of a particular continued fraction expansion closely related to the Hecke triangle groups. We also obtain explicit expressions for the associated first return times.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:49:21 GMT" } ]
2008-01-28T00:00:00
[ [ "Mayer", "Dieter", "" ], [ "Strömberg", "Fredrik", "" ] ]
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801.3952
Deborah B. Haarsma
Deborah B. Haarsma, Joshua N. Winn, Irwin Shapiro, Joseph Leh\'ar
The Central Component of Gravitational Lens Q0957+561
18 pages, accepted for publication in AJ
Astronomical Journal 135, 984 (2008)
10.1088/0004-6256/135/3/984
null
astro-ph
null
In 1981, a faint radio source (G') was detected near the center of the lensing galaxy of the famous "twin quasar" Q0957+561. It is still unknown whether this central radio source is a third quasar image or an active nucleus of the lensing galaxy, or a combination of both. In an attempt to resolve this ambiguity, we observed Q0957+561 at radio wavelengths of 13cm, 18cm, and 21cm, using the Very Long Baseline Array in combination with the phased Very Large Array and the Green Bank Telescope. We measured the spectrum of G' for the first time and found it to be significantly different from the spectra of the two bright quasar images. This finding suggests that the central component is primarily or entirely emission from the foreground lens galaxy, but the spectrum is also consistent with the hypothesis of a central quasar image suffering free-free absorption. In addition, we confirm the previously-reported VLBI position of G' just north of the optical center of the lens galaxy. The position slightly favors the hypothesis that G' originates in the lens, but is not conclusive. We discuss the prospects for further clarification of this issue.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:58:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Haarsma", "Deborah B.", "" ], [ "Winn", "Joshua N.", "" ], [ "Shapiro", "Irwin", "" ], [ "Lehár", "Joseph", "" ] ]
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801.3953
Jeffrey Burdges
Jeffrey Burdges and Gregory Cherlin
Semisimple torsion in groups of finite Morley rank
null
null
null
null
math.LO math.GR
null
We prove several results about groups of finite Morley rank without unipotent p-torsion: p-torsion always occurs inside tori, Sylow p-subgroups are conjugate, and p is not the minimal prime divisor of our approximation to the ``Weyl group.'' These results are quickly finding extensive applications within the classification project.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:01:29 GMT" } ]
2008-01-28T00:00:00
[ [ "Burdges", "Jeffrey", "" ], [ "Cherlin", "Gregory", "" ] ]
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801.3954
Wei Guo
Wei Guo, Dafei Jin, and Humphrey J. Maris
Stability of multi-electron bubbles in liquid helium
7 pages, 5 figures
Phys. Rev. B 78, 014511 (2008)
10.1103/PhysRevB.78.014511
null
cond-mat.other
null
The stability of multi-electron bubbles in liquid helium is investigated theoretically. We find that multi-electron bubbles are unstable against fission whenever the pressure is positive. It is shown that for moving bubbles the Bernoulli effect can result in a range of pressures over which the bubbles are stable.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:50:53 GMT" } ]
2010-01-03T00:00:00
[ [ "Guo", "Wei", "" ], [ "Jin", "Dafei", "" ], [ "Maris", "Humphrey J.", "" ] ]
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801.3955
Eric R. Sharpe
Josh Guffin, Eric Sharpe
A-twisted heterotic Landau-Ginzburg models
31 pages, LaTeX
J.Geom.Phys.59:1581-1596,2009
10.1016/j.geomphys.2009.07.013
VPI-IPNAS-08-03, ILL-TH-08-2
hep-th
null
In this paper, we apply the methods developed in recent work for constructing A-twisted (2,2) Landau-Ginzburg models to analogous (0,2) models. In particular, we study (0,2) Landau-Ginzburg models on topologically non-trivial spaces away from large-radius limits, where one expects to find correlation function contributions akin to (2,2) curve corrections. Such heterotic theories admit A- and B-model twists, and exhibit a duality that simultaneously exchanges the twists and dualizes the gauge bundle. We explore how this duality operates in heterotic Landau-Ginzburg models, as well as other properties of these theories, using examples which RG flow to heterotic nonlinear sigma models as checks on our methods.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:54:02 GMT" } ]
2009-11-05T00:00:00
[ [ "Guffin", "Josh", "" ], [ "Sharpe", "Eric", "" ] ]
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801.3956
Boris Lavrov
B. P. Lavrov and I. S. Umrikhin
Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium
46 pages, 9 pictures
null
10.1088/0953-4075/41/10/105103
null
physics.optics physics.atom-ph
null
Optimal set of 1050 rovibronic energy levels for 35 triplet electronic states of $D_2$ has been obtained by means of a statistical analysis of all available wavenumbers of triplet-triplet rovibronic transitions studied in emission, absorption, laser and anticrossing spectroscopic experiments of various authors. We used a new method of the analysis (Lavrov, Ryazanov, JETP Letters, 2005), which does not need any \it a priory \rm assumptions concerning the molecular structure being based on only two fundamental principles: Rydberg-Ritz and maximum likelihood. The method provides the opportunity to obtain the RMS estimates for uncertainties of the experimental wavenumbers independent from those presented in original papers. 234 from 3822 published wavenumber values were found to be spurious, while the remaining set of the data may be divided into 20 subsets (samples) of uniformly precise data having close to normal distributions of random errors within the samples. New experimental wavenumber values of 125 questionable lines were obtained in the present work. Optimal values of the rovibronic levels were obtained from the experimental data set consisting of 3713 wavenumber values (3588 old and 125 new). The unknown shift between levels of ortho- and para- deuterium was found by least squares analysis of the $a^3\Sigma_g^+$, $v = 0$, $N = 0 \div 18$ rovibronic levels with odd and even values of $N$. All the energy levels were obtained relative to the lowest vibro-rotational level ($v = 0$, $N = 0$) of the $a^3\Sigma_g^+$ electronic state, and presented in tabular form together with the standard deviations of the empirical determination. New energy level values differ significantly from those available in literature.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:56:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Lavrov", "B. P.", "" ], [ "Umrikhin", "I. S.", "" ] ]
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801.3957
Jeffrey Burdges
Jeffrey Burdges and Gregory Cherlin
A generation theorem for groups of finite Morley rank
null
null
null
null
math.GR math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We deal with two forms of the "uniqueness cases" in the classification of large simple $K^*$-groups of finite Morley rank of odd type, where large means the $m_2(G)$ at least three. This substantially extends results known for even larger groups having \Prufer 2-rank at least three, to cover the two groups $\PSp_4$ and $\G_2$. With an eye towards distant developments, we carry out this analysis for $L^*$-groups which is substantially broader than the $K^*$ setting.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 14:57:34 GMT" }, { "version": "v2", "created": "Fri, 7 Nov 2008 21:50:41 GMT" } ]
2008-11-10T00:00:00
[ [ "Burdges", "Jeffrey", "" ], [ "Cherlin", "Gregory", "" ] ]
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801.3958
Jeffrey Burdges
Alexandre Borovik and Jeffrey Burdges
Linear groups of finite Morley rank
null
null
null
null
math.LO math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that a non-algebraic simple group of finite Morley rank with a definable representation over a field has no involutions, and otherwise resembles a bad group. In particular, the modern form of the Cherlin-Zilber alebaricity conjecture hold for such groups.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:07:39 GMT" }, { "version": "v2", "created": "Sat, 15 Nov 2008 02:49:54 GMT" } ]
2008-11-15T00:00:00
[ [ "Borovik", "Alexandre", "" ], [ "Burdges", "Jeffrey", "" ] ]
[ -0.0877467915, 0.0475512631, -0.0141894482, -0.0069642193, 0.0128725348, 0.0092777163, 0.0627847463, -0.0811978132, -0.1685649455, 0.0322228596, 0.0161232948, -0.098234646, 0.0059854318, -0.0045854696, 0.0260535348, 0.0140826711, 0.0739844516, -0.032958433, 0.066106692, 0.1285117865, 0.0193028692, -0.0213079005, 0.0313923731, -0.0168944597, -0.002856279, 0.0038439643, 0.0724183917, 0.0123149222, 0.0902619734, -0.0243688356, 0.0584662221, -0.0249857679, -0.0167402271, -0.0144860502, -0.1390471011, 0.0240840968, -0.0044075083, -0.0472665243, 0.0260298066, -0.0013020836, -0.0138335256, 0.1061123982, -0.0793470144, -0.0442767739, 0.1945710331, 0.0835706294, 0.079774119, -0.0165504012, -0.0953398049, -0.0134538747, -0.1354404241, 0.0778758675, 0.0387718379, -0.015838556, -0.0593678914, 0.0692388117, -0.0584662221, 0.0197299775, 0.0427344404, -0.0020480379, 0.0460563861, -0.0543375202, 0.0310127232, 0.0651575699, -0.0958618224, -0.0362091959, -0.1568906903, 0.0248196702, 0.1194001734, 0.1817578226, -0.1083903015, 0.0149250217, 0.0649677441, 0.1113325953, -0.0396497808, 0.0016876664, 0.0423073359, 0.0685744211, -0.079774119, 0.0569001622, -0.0071659088, 0.0123742428, 0.0962414742, 0.0239654556, 0.0170012377, -0.0094260173, 0.0069523552, 0.0490224101, -0.0502088182, -0.0103988722, 0.0353549793, -0.10649205, -0.0740319043, 0.0617407113, 0.073225148, -0.0189706758, 0.1390471011, 0.0958618224, 0.0536731295, 0.0399582461, -0.0507308356, 0.0524867214, 0.0530087426, -0.0482868366, 0.0503037311, 0.0920653194, 0.037182048, -0.0143555459, -0.0385820121, 0.0256501567, -0.0330296196, 0.0139403027, -0.0779233277, 0.0533409379, 0.0160639733, -0.0763572678, -0.0978549942, -0.0199435297, -0.0517748781, 0.0183181502, 0.0177012179, -0.0225892216, -0.0316059291, -0.0121844178, 0.0308940839, -0.04133448, 0.0429479964, -0.0402667113, 0.007919278, -0.0560459495, -0.0204892792, -0.0321279466, -0.0053922278, 0.0107073383, -0.1035497561, -0.0288060047, 0.0010188285, -0.1486332864, 0.1162680537, -0.0122674666, -0.0279992465, 0.0293754805, 0.0876993313, 0.0065252478, -0.0283788964, 0.0683845952, -0.0703777671, 0.0314635597, 0.0884586349, -0.070567593, -0.0199909862, -0.0852790624, -0.000886099, 0.0723234788, -0.0661541522, -0.0544324331, -0.0017099116, 0.0381549038, 0.0242620576, 0.0066201608, 0.179290086, 0.0847095847, 0.0511104874, -0.0104048047, -0.0012561103, 0.0552391894, -0.080106318, -0.007824366, -0.0287585482, -0.0839028284, 0.0239298642, -0.0167402271, -0.1540433019, -0.0894077644, -0.0030520365, 0.0572323576, -0.0566154234, -0.1141799763, 0.0194452386, -0.0683371425, -0.0254603308, 0.054527346, 0.0029348787, 0.0195401516, -0.0680998638, 0.0561883189, 0.0629271194, -0.0264806431, 0.005579087, 0.0118403593, -0.0955770835, 0.0574221835, 0.0282127988, 0.175683409, 0.0292568393, -0.1417046636, -0.0140945353, -0.0220909305, -0.0135369236, -0.0299449563, 0.0094022891, -0.0660592392, 0.0602695644, -0.0374193303, -0.0605542995, 0.0483580194, 0.022731591, 0.0043125958, -0.0581814833, 0.0694760978, 0.0253179614, -0.1073462591, 0.0466021337, -0.0411683843, 0.0720861927, 0.0250569526, -0.0189350825, -0.0705201328, 0.0046744505, 0.1287965328, -0.0276195947, 0.0201333556, 0.0093370369, 0.0326499678, -0.0237993598, 0.0684320554, -0.0141894482, -0.0550019071, -0.0049829166, 0.0419276841, 0.0379413515, -0.0161470231, -0.0423785187, -0.0634965971, -0.0179385003, 0.0762148947, 0.1005125493, 0.0125640687, -0.0787775367, 0.00841757, -0.0578018315, 0.0429954529, -0.0054782424, 0.0174046159, 0.0344533101, 0.0053625675, -0.0141894482, 0.0711845234, 0.0141301276, -0.0104226004, -0.0154589061, 0.156416133, 0.0474326201, -0.0546697155, -0.0725607574, 0.0486902148 ]
801.3959
Suvrath Mahadevan
Suvrath Mahadevan, Julian van Eyken, Jian Ge, Curtis DeWitt, Scott W. Fleming, Roger Cohen, Justin Crepp and Andrew Vanden Heuvel
Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer
9 pages, 4 figures. Accepted for publication in ApJ
null
10.1086/533514
null
astro-ph
null
We demonstrate the ability to measure precise stellar barycentric radial velocities with the dispersed fixed-delay interferometer technique using the Exoplanet Tracker (ET), an instrument primarily designed for precision differential Doppler velocity measurements using this technique. Our barycentric radial velocities, derived from observations taken at the KPNO 2.1 meter telescope, differ from those of Nidever et al. by 0.047 km/s (rms) when simultaneous iodine calibration is used, and by 0.120 km/s (rms) without simultaneous iodine calibration. Our results effectively show that a Michelson interferometer coupled to a spectrograph allows precise measurements of barycentric radial velocities even at a modest spectral resolution of R ~ 5100. A multi-object version of the ET instrument capable of observing ~500 stars per night is being used at the Sloan 2.5 m telescope at Apache Point Observatory for the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS), a wide-field radial velocity survey for extrasolar planets around TYCHO-2 stars in the magnitude range 7.6<V<12. In addition to precise differential velocities, this survey will also yield precise barycentric radial velocities for many thousands of stars using the data analysis techniques reported here. Such a large kinematic survey at high velocity precision will be useful in identifying the signature of accretion events in the Milky Way and understanding local stellar kinematics in addition to discovering exoplanets, brown dwarfs and spectroscopic binaries.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:30:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Mahadevan", "Suvrath", "" ], [ "van Eyken", "Julian", "" ], [ "Ge", "Jian", "" ], [ "DeWitt", "Curtis", "" ], [ "Fleming", "Scott W.", "" ], [ "Cohen", "Roger", "" ], [ "Crepp", "Justin", "" ], [ "Heuvel", "Andrew Vanden", "" ] ]
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801.396
Alexander E. Hramov
Alexander E. Hramov, Alexey Koronovskii, Mikhail Morozov, Alexander Mushtakov
Effect of External Magnetic Field on Critical Current for the Onset of Virtual Cathode Oscillations in Relativistic Electron Beams
25 pages, 6 figures
Phys. Lett. A. 372 (2008) 876-883
10.1016/j.physleta.2007.08.039
null
physics.plasm-ph
null
In this Letter we research the space charge limiting current value at which the oscillating virtual cathode is formed in the relativistic electron beam as a function of the external magnetic field guiding the beam electrons. It is shown that the space charge limiting (critical) current decreases with growth of the external magnetic field, and that there is an optimal induction value of the magnetic field at which the critical current for the onset of virtual cathode oscillations in the electron beam is minimum. For the strong external magnetic field the space charge limiting current corresponds to the analytical relation derived under the assumption that the motion of the electron beam is one-dimensional [High Power Microwave Sources. Artech House Microwave Library, 1987. Chapter~13]. Such behavior is explained by the characteristic features of the dynamics of electron space charge in the longitudinal and radial directions in the drift space at the different external magnetic fields.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:08:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Hramov", "Alexander E.", "" ], [ "Koronovskii", "Alexey", "" ], [ "Morozov", "Mikhail", "" ], [ "Mushtakov", "Alexander", "" ] ]
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801.3961
Ralf Hofmann
Jochen Keller
Gauge-invariant two-point correlator of energy density in deconfining SU(2) Yang-Mills thermodynamics
v4: error in thermal part corrected, some figures altered, slight changes of text
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The thesis is considering aspects of SU(2) Yang-Mills thermodynamics in its deconfining high-temperature phase. We calculate the two-point correlation function of the energy density of the photon in a thermalized gas, at first in the conventional U(1) gauge theory, followed by a calculation, where the photon is identified with the massless gauge mode in deconfining SU(2) Yang-Mills thermodynamics. Apart from the fact, that this calculation is interesting from a technical point of view, we can consider several aspects of phenomenological relevance. Since we interpret the two-point correlator of energy density as a measure for the energy transfer, and thus for the electromagnetic interaction of microscopic objects, such as atoms immersed into a photon gas, we are able to give an explanation for the unexpected stability of cold, innergalactic clouds consisting of atomic hydrogen. Subsequently, we evaluate the spatial string tension in deconfining SU(2) Yang-Mills thermodynamics, which can be regarded as measure for the magnetic flux through the area enclosed by the associated Wilson loop. On the level of on-shell polarization effects for the massless mode we observe a perimeter-law, and we speculate that the lattice-obtained area-law is induced by off-shell contributions to the polarization tensor. Moreover, we discuss an interesting two-loop result for the pressure which seems to be associated with the presence of screened magnetic monopoles being responsible for an area-law.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:21:12 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 07:43:39 GMT" }, { "version": "v3", "created": "Mon, 2 Jun 2008 14:23:27 GMT" }, { "version": "v4", "created": "Mon, 15 Dec 2008 13:05:48 GMT" } ]
2008-12-15T00:00:00
[ [ "Keller", "Jochen", "" ] ]
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801.3962
Bernd Stratmann Dr
J. Schmeling, B.O. Stratmann
The Hausdorff dimension of the set of dissipative points for a Cantor-like model set for singly cusped parabolic dynamics
null
null
null
null
math.DS math.SP
null
In this paper we introduce and study a certain intricate Cantor-like set $C$ contained in unit interval. Our main result is to show that the set $C$ itself, as well as the set of dissipative points within $C$, both have Hausdorff dimension equal to 1. The proof uses the transience of a certain non-symmetric Cauchy-type random walk.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:35:54 GMT" } ]
2008-01-28T00:00:00
[ [ "Schmeling", "J.", "" ], [ "Stratmann", "B. O.", "" ] ]
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801.3963
Ines Samengo
Germ\'an Mato and In\'es Samengo
Type I and type II neuron models are selectively driven by differential stimulus features
25 pages and 9 figures. To appear in Neural Computation
null
null
null
q-bio.NC
null
Neurons in the nervous system exhibit an outstanding variety of morphological and physiological properties. However, close to threshold, this remarkable richness may be grouped succinctly into two basic types of excitability, often referred to as type I and type II. The dynamical traits of these two neuron types have been extensively characterized. It would be interesting, however, to understand the information-processing consequences of their dynamical properties. To that end, here we determine the differences between the stimulus features inducing firing in type I and in type II neurons. We work both with realistic conductance-based models and minimal normal forms. We conclude that type I neurons fire in response to scale-free depolarizing stimuli. Type II neurons, instead, are most efficiently driven by input stimuli containing both depolarizing and hyperpolarizing phases, with significant power in the frequency band corresponding to the intrinsic frequencies of the cell.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:58:52 GMT" } ]
2008-01-28T00:00:00
[ [ "Mato", "Germán", "" ], [ "Samengo", "Inés", "" ] ]
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801.3964
Gr\'egoire Dupont
G. Dupont
Cluster multiplication in regular components via generalized Chebyshev polynomials
20 pages. The article was entirely reorganized. Results were slightly generalized. Proofs are shortened. Some new results are proved
null
null
null
math.RT math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a multivariate generalization of normalized Chebyshev polynomials of the second kind. We prove that these polynomials arise in the context of cluster characters associated to Dynkin quivers of type $\mathbb A$ and representation-infinite quivers. This allows to obtain a simple combinatorial description of cluster algebras of type $\mathbb A$. We also provide explicit multiplication formulas for cluster characters associated to regular modules over the path algebra of any representation-infinite quiver.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:52:29 GMT" }, { "version": "v2", "created": "Wed, 14 Oct 2009 19:05:57 GMT" } ]
2009-10-14T00:00:00
[ [ "Dupont", "G.", "" ] ]
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801.3965
Jocelyne Troccaz
Pierre Mozer (TIMC), Michael Baumann (TIMC), G. Chevreau (TIMC), Vincent Daanen (TIMC), Alexandre Moreau-Gaudry (TIMC, CHU-Grenoble CIC), Jocelyne Troccaz (TIMC)
Framework for 3D TransRectal Ultrasound
null
Johns Hopkins University "Prostate Day", Baltimore : \'Etats-Unis d'Am\'erique (2008)
null
null
cs.OH
null
Prostate biopsies are mainly performed under 2D TransRectal UltraSound (TRUS) control by sampling the prostate according to a predefined pattern. In case of first biopsies, this pattern follows a random systematic plan. Sometimes, repeat biopsies can be needed to target regions unsampled by previous biopsies or resample critical regions (for example in case of cancer expectant management or previous prostatic intraepithelial neoplasia findings). From a clinical point of view, it could be useful to control the 3D spatial distribution of theses biopsies inside the prostate. Modern 3D-TRUS probes allow acquiring high-quality volumes of the prostate in few seconds. We developed a framework to track the prostate in 3D TRUS images. It means that if one acquires a reference volume at the beginning of the session and another during each biopsy, it is possible to determine the relationship between the prostate in the reference and the others volumes by aligning images. We used this tool to evaluate the ability of a single operator (a young urologist assistant professor) to perform a pattern of 12 biopsies under 2D TRUS guidance.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:40:54 GMT" } ]
2008-01-28T00:00:00
[ [ "Mozer", "Pierre", "", "TIMC" ], [ "Baumann", "Michael", "", "TIMC" ], [ "Chevreau", "G.", "", "TIMC" ], [ "Daanen", "Vincent", "", "TIMC" ], [ "Moreau-Gaudry", "Alexandre", "", "TIMC, CHU-Grenoble CIC" ], [ "Troccaz", "Jocelyne", "", "TIMC" ] ]
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801.3966
Elena Khomenko
E. Khomenko, M. Collados, T. Felipe
Observational signatures of numerically simulated MHD waves in small-scale fluxtubes
Proceeding of SPW5, Ascona, Switzerland, 2007, 6 pages 2 color figures
null
null
null
astro-ph
null
We present some results obtained from the synthesis of Stokes profiles in small-scale flux tubes with propagating MHD waves. To that aim, realistic flux tubes showing internal structure have been excited with 5 min period drivers, allowing non-linear waves to propagate inside the magnetic structure. The observational signatures of these waves in Stokes profiles of several spectral lines that are commonly used in spectropolarimetric measurements are discussed.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:47:12 GMT" } ]
2008-01-28T00:00:00
[ [ "Khomenko", "E.", "" ], [ "Collados", "M.", "" ], [ "Felipe", "T.", "" ] ]
[ 0.0593280643, 0.1093741581, -0.0728204176, -0.1186561286, 0.0136598088, 0.046003174, -0.0511943772, -0.0341854058, 0.0086480221, -0.0007916887, -0.0211356226, -0.0300467946, -0.0774135515, -0.0246402845, 0.109661229, 0.1135845333, -0.0478691347, 0.0586103871, 0.0347595476, 0.156166777, -0.0169372056, -0.1187518165, 0.0212313142, 0.0577013269, -0.0568879582, -0.0579405539, -0.0498547107, 0.0370082706, 0.0608591102, -0.0779877007, 0.0875088945, -0.0300228707, -0.0840640366, -0.0160161853, -0.0580840893, 0.0947335213, -0.0167338625, 0.1126276329, -0.0747342259, -0.0007625331, 0.0251187366, -0.0699975491, -0.0577970184, 0.1048767045, 0.0240900647, -0.0355489925, -0.0471993014, 0.0170687791, 0.1517650187, 0.0026120497, 0.0302860197, 0.0498068668, -0.0442568213, -0.0496154875, -0.080714874, -0.0517206751, 0.0042372919, 0.0122184716, -0.075451903, -0.0607634224, -0.0457400233, -0.0900446922, -0.0109625347, 0.0286114383, -0.0178582259, 0.0775092468, -0.0451180376, 0.0029693935, 0.0119134579, 0.0463859327, 0.0286353603, -0.0356925279, -0.0309558529, -0.030214252, 0.0192457363, -0.0035495167, -0.086360611, 0.034161482, 0.0139708025, -0.005570977, 0.0837291256, 0.0125354463, -0.0213628877, -0.0262191761, -0.0885614902, 0.0216499586, 0.0384436287, -0.0761695802, 0.0555004478, 0.0051134573, 0.0234321933, 0.0613375641, -0.001119877, -0.0057175029, 0.0766958743, -0.0311233103, 0.0742079243, -0.0581319332, 0.0641604289, 0.0653087124, 0.0134086208, 0.0521512814, 0.0299032591, -0.1080344915, 0.1460235864, 0.0845903382, 0.0415296443, -0.0300228707, -0.0126789818, 0.054926306, 0.1191345826, -0.0427257754, 0.0743514597, 0.0232886579, 0.0600935891, 0.0051493412, -0.0385153964, -0.0854993984, -0.0313146934, 0.0499504022, -0.0581319332, 0.0581319332, 0.023994375, 0.0710979849, 0.1279381067, -0.0387067758, 0.0130019365, 0.0025552334, -0.1374114454, -0.0205734409, -0.0597108267, -0.0954033583, -0.0509551503, 0.0013508797, -0.0522469729, 0.0583711602, 0.0639212057, -0.0522469729, 0.0935373902, 0.0275109969, 0.0697104782, -0.0094494298, 0.123727724, 0.0513857603, 0.0376063362, 0.1086086333, -0.0419841744, 0.1193259582, -0.0182170644, 0.0039173267, -0.0179299936, 0.0115366774, -0.0370561182, 0.0263148677, 0.0414578766, -0.0198796857, 0.0633949041, -0.015836766, -0.0457400233, -0.0272717718, 0.0290659666, 0.0461945534, -0.1295648366, 0.0810019448, -0.0307166278, -0.0394005328, 0.044328589, -0.0562659726, -0.0953555107, 0.0129780145, -0.0393526889, -0.0767915696, -0.0455964878, 0.0753562078, 0.1008577123, 0.0338026434, -0.0999964923, -0.195208475, -0.1011447832, 0.0598065183, -0.0991352797, 0.0154540036, 0.0283243656, 0.0171883926, -0.0170448571, -0.0295204967, -0.0274153072, -0.0577491708, 0.0327261277, -0.0845424905, -0.0621987768, 0.083202824, -0.1275553405, 0.0852123275, -0.0854993984, -0.1184647456, 0.0290181227, 0.094972752, -0.0803799555, 0.0411708057, 0.0448070429, 0.035907831, 0.0268172417, -0.0843032673, -0.053682331, 0.0261952542, 0.0296640322, 0.0926761776, -0.0359556787, 0.0360752903, 0.0986568332, 0.0657393262, 0.1005706415, 0.0890399441, -0.0574620999, 0.0229417793, -0.1197087243, 0.0235757288, 0.0966473296, 0.0542564727, -0.0482518971, 0.0821023881, 0.1163595617, 0.0600457415, -0.0208724737, 0.016087953, 0.0311472341, 0.0112496056, -0.0419363305, 0.0286114383, 0.0303099435, 0.0119014969, -0.0137913823, -0.0181931425, 0.0677009746, -0.0445917398, -0.0068239234, 0.0363623612, 0.0130497823, -0.0080619184, 0.019054357, 0.032917507, -0.0122962194, -0.0184323676, -0.0158606879, 0.0140545312, -0.0854993984, -0.0522469729, 0.117603533, -0.0514336042, 0.079231672, 0.0190304331, -0.0622944683, -0.0601892769, 0.0082772216, 0.0510508418 ]
801.3967
Yuriy Khaidukov N.
Yu. N. Khaidukov, Yu.V. Nikitenko, V.L. Aksenov
Optimization of parameters of nanostructure for study inverse proximity effects on "superconductor-ferromagnetic" interface using Polarized Neutron Reflectometry in enhanced standing wave regime
7 pages, 5 figures
null
null
null
cond-mat.supr-con cond-mat.str-el
null
This work is devoted to experimental study of influence of superconductivity (S) on ferromagnetism (FM) (inverse proximity effects) with the help of Polarized Neutron Reflectivity. Combining meausurements of specular and diffuse intensities it is possible to obtain full picture of magnetization change in S/FM layered systems like magnetization rotation, domain state formation, inducing of magnetization in S layer, etc. To increase weak magnetic signal we propose to use enhanced neutron standing wave regime (e.g. waveguides). Choose of materials, optimization of thicknesses of layers, estimation of roughnesses influence is presented in this work.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:10:00 GMT" } ]
2008-01-28T00:00:00
[ [ "Khaidukov", "Yu. N.", "" ], [ "Nikitenko", "Yu. V.", "" ], [ "Aksenov", "V. L.", "" ] ]
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801.3968
Douglas Heggie
Mirek Giersz, Douglas Heggie
Monte Carlo Simulations of Star Clusters - V. The globular cluster M4
10 pages, 13 figures. Some numbers and figures may change slightly before journal submission
null
10.1111/j.1365-2966.2008.13407.x
null
astro-ph
null
We describe Monte Carlo models for the dynamical evolution of the nearby globular cluster M4. The code includes treatments of two-body relaxation, three- and four-body interactions involving primordial binaries and those formed dynamically, the Galactic tide, and the internal evolution of both single and binary stars. We arrive at a set of initial parameters for the cluster which, after 12Gyr of evolution, gives a model with a satisfactory match to the surface brightness profile, the velocity dispersion profile, and the luminosity function in two fields. We describe in particular the evolution of the core, and find that M4 (which has a classic King profile) is actually a post-collapse cluster, its core radius being sustained by binary burning. We also consider the distribution of its binaries, including those which would be observed as photometric binaries and as radial-velocity binaries. We also consider the populations of white dwarfs, neutron stars, black holes and blue stragglers, though not all channels for blue straggler formation are represented yet in our simulations.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:58:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Giersz", "Mirek", "" ], [ "Heggie", "Douglas", "" ] ]
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801.3969
Anatoly Zasov V.
A. V. Zasov, A. V. Moiseev, A. V. Khoperskov, and E. A. Sidorova
Early-Type Disk Galaxies: Structure and Kinematics
14 pages, 8 figures, Astronomy Reports, 2008, Vol. 52, No. 2, pp. 79-93
null
10.1007/s11444-008-2001-2
null
astro-ph
null
Spectroscopic observations of three lenticular (S0) galaxies (NGC 1167, NGC 4150, and NGC 6340) and one SBa galaxy (NGC 2273) have been taken with the 6-m telescope of the Special AstrophysicalObservatory of the Russian Academy of Sciences aimed to study the structure and kinematic properties of early-type disk galaxies. The radial profiles of the stellar radial velocities and the velocity dispersion are measured. N-body simulations are used to construct dynamical models of galaxies containing a stellar disk, bulge, and halo. The masses of individual components are estimated formaximum-mass disk models. A comparison of models with estimated rotational velocities and the stellar velocity dispersion suggests that the stellar disks in lenticular galaxies are "overheated"; i.e., there is a significant excess velocity dispersion over the minimum level required to maintain the stability of the disk. This supports the hypothesis that the stellar disks of S0 galaxies were subject to strong gravitational perturbations. The relative thickness of the stellar disks in the S0 galaxies considered substantially exceed the typical disk thickness of spiral galaxies.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 15:55:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Zasov", "A. V.", "" ], [ "Moiseev", "A. V.", "" ], [ "Khoperskov", "A. V.", "" ], [ "Sidorova", "E. A.", "" ] ]
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801.397
Jean-Louis Pichard
Axel Freyn (SPEC), Ioannis Kleftogiannis (SPEC), Jean-Louis Pichard (SPEC)
Scanning Gate Microscopy of a Nanostructure where Electrons Interact
null
Phys. Rev. Lett. 100 (2008) 226802-1
10.1103/PhysRevLett.100.226802
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that scanning gate microscopy can be used for probing electron-electron interactions inside a nanostructure. We assume a simple model made of two non-interacting strips attached to an interacting nanosystem. In one of the strips, the electrostatic potential can be locally varied by a charged tip. This change induces corrections upon the nanosystem Hartree-Fock self-energies which enhance the fringes spaced by half the Fermi wavelength in the images giving the quantum conductance as a function of the tip position.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:02:32 GMT" }, { "version": "v2", "created": "Tue, 7 Oct 2008 18:19:03 GMT" } ]
2008-10-07T00:00:00
[ [ "Freyn", "Axel", "", "SPEC" ], [ "Kleftogiannis", "Ioannis", "", "SPEC" ], [ "Pichard", "Jean-Louis", "", "SPEC" ] ]
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801.3971
Uwe Aickelin
Jingpeng Li and Uwe Aickelin
A Bayesian Optimisation Algorithm for the Nurse Scheduling Problem
null
Proceedings of the IEEE Congress on Evolutionary Computation (CEC 2003), pp 2149-2156, Canberra, Australia, 2003
null
null
cs.NE cs.CE
null
A Bayesian optimization algorithm for the nurse scheduling problem is presented, which involves choosing a suitable scheduling rule from a set for each nurses assignment. Unlike our previous work that used Gas to implement implicit learning, the learning in the proposed algorithm is explicit, ie. Eventually, we will be able to identify and mix building blocks directly. The Bayesian optimization algorithm is applied to implement such explicit learning by building a Bayesian network of the joint distribution of solutions. The conditional probability of each variable in the network is computed according to an initial set of promising solutions. Subsequently, each new instance for each variable is generated, ie in our case, a new rule string has been obtained. Another set of rule strings will be generated in this way, some of which will replace previous strings based on fitness selection. If stopping conditions are not met, the conditional probabilities for all nodes in the Bayesian network are updated again using the current set of promising rule strings. Computational results from 52 real data instances demonstrate the success of this approach. It is also suggested that the learning mechanism in the proposed approach might be suitable for other scheduling problems.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:07:25 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 17:07:17 GMT" }, { "version": "v3", "created": "Fri, 16 May 2008 10:43:52 GMT" } ]
2010-07-05T00:00:00
[ [ "Li", "Jingpeng", "" ], [ "Aickelin", "Uwe", "" ] ]
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801.3972
Michael Plumacher
F. Hahn-Woernle and M. Plumacher
Effects of reheating on leptogenesis
null
Nucl.Phys.B806:68-83,2009
10.1016/j.nuclphysb.2008.07.032
null
hep-ph
null
We study the evolution of a cosmological baryon asymmetry in leptogenesis when the right-handed neutrinos are produced in inflaton decays. By performing a detailed numerical study over a broad range of inflaton-neutrino couplings we show that the resulting asymmetry can be larger by two orders of magnitude or more than in thermal leptogenesis, if the reheating temperature T_{RH} is of the same order as the right-handed neutrino mass M_1. Hence, the lower limit on the baryogenesis temperature obtained in thermal leptogenesis can be relaxed accordingly.
[ { "version": "v1", "created": "Fri, 25 Jan 2008 16:22:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Hahn-Woernle", "F.", "" ], [ "Plumacher", "M.", "" ] ]
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