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711.3908
Doron Lemze
Doron Lemze, Rennan Barkana, Tom J. Broadhurst, Yoel Rephaeli
Mass and Gas Profiles in A1689: Joint X-ray and Lensing Analysis
18 pages, 20 figures, 7 tables, accepted for publication in MNRAS, minor changes to match published version
null
10.1111/j.1365-2966.2008.13116.x
null
astro-ph
null
We carry out a comprehensive joint analysis of high quality HST/ACS and Chandra measurements of A1689, from which we derive mass, temperature, X-ray emission and abundance profiles. The X-ray emission is smooth and symmetric, and the lensing mass is centrally concentrated indicating a relaxed cluster. Assuming hydrostatic equilibrium we deduce a 3D mass profile that agrees simultaneously with both the lensing and X-ray measurements. However, the projected temperature profile predicted with this 3D mass profile exceeds the observed temperature by ~30% at all radii, a level of discrepancy comparable to the level found for other relaxed clusters. This result may support recent suggestions from hydrodynamical simulations that denser, more X-ray luminous small-scale structure can bias observed temperature measurements downward at about the same (~30%) level. We determine the gas entropy at 0.1r_{vir} (where r_{vir} is the virial radius) to be ~800 keV cm^2, as expected for a high temperature cluster, but its profile at >0.1r_{vir} has a power-law form with index ~0.8, considerably shallower than the ~1.1 index advocated by theoretical studies and simulations. Moreover, if a constant entropy ''floor'' exists at all, then it is within a small region in the inner core, r<0.02r_{vir}, in accord with previous theoretical studies of massive clusters.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 17:57:05 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 16:41:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Lemze", "Doron", "" ], [ "Barkana", "Rennan", "" ], [ "Broadhurst", "Tom J.", "" ], [ "Rephaeli", "Yoel", "" ] ]
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711.3909
Dietrich Stauffer
Carmen Costea
Application of Tuncay's language teacher model to business-customer relations
5 pages, no figures, to be published in Int. J. Mod. Phys. C
null
10.1142/S0129183108012054
null
q-fin.GN physics.soc-ph
null
It seems that what has been said by now about market and competitiveness do not fit perfectly with competences of getting the best of profit. Sometimes, the classical methods of fundamentals of management do not apply to individual companies that face irregular accommodation on the market. It is high time to replace the perfect business with the right one. New approaches and models may help in identifying new competition trends, changes for better application of purposes and proposals.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 15:50:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Costea", "Carmen", "" ] ]
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711.391
Swarup Majee
Swarup Kumar Majee, Amitava Raychaudhuri
SU(6), Triquark states, and the pentaquark
17 pages, 1 figure. accepted for publication in Phys. Rev. D
Phys.Rev.D77:074016,2008
10.1103/PhysRevD.77.074016
null
hep-ph
null
The purported observation of a state $\Theta^+$ with strangeness S = +1 led to its quark model interpretation in terms of a pentaquark combination involving a triquark-diquark structure -- the Karliner-Lipkin model. In this work, the proper colour-spin symmetry properties for the $q q \bar{q}$ triquark are elucidated by calculating the SU(6) unitary scalar factors and Racah coefficients. Using these results, the colour-spin hyperfine interactions, including flavour symmetry breaking therein, become straight-forward to incorporate and the pentaquark masses are readily obtained. We examine the effect on the pentaquark mass of (a) deviations from the flavour symmetric limit and (b) different strengths of the doublet and triplet hyperfine interactions. Reference values of these parameters yield a $\Theta^+$ mass prediction of 1601 MeV but it can comfortably accommodate 1540 MeV for alternate choices. In the same framework, other pentaquark states $\Xi$ (S=--2) and $\Theta^c $ (with charm C=--1) are expected at 1783 MeV and 2757 MeV, respectively.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 15:58:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Majee", "Swarup Kumar", "" ], [ "Raychaudhuri", "Amitava", "" ] ]
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711.3911
Scott Edward Pratt
Scott Pratt
Formulating Viscous Hydrodynamics for Large Velocity Gradients
16 pages
Phys.Rev.C77:024910,2008
10.1103/PhysRevC.77.024910
null
nucl-th
null
Viscous corrections to relativistic hydrodynamics, which are usually formulated for small velocity g radients, have recently been extended from Navier-Stokes formulations to a class of treatments based on Israel-Stewart equations. Israel-Stewart treatments, which treat the spatial components of the s tress-energy tensor tau_ij as dynamical objects, introduce new parameters, such as the relaxati on times describing non-equilibrium behavior of the elements tau_ij. By considering linear resp onse theory and entropy constraints, we show how the additional parameters are related to fluctuatio ns of tau_ij. Furthermore, the Israel-Stewart parameters are analyzed for their ability to prov ide stable and physical solutions for sound waves. Finally, it is shown how these parameters, which are naturally described by correlation functions in real time, might be constrained by lattice calcu lations, which are based on path-integral formulations in imaginary time.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 16:21:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Pratt", "Scott", "" ] ]
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711.3912
Alexander K. Hartmann
Alexander K. Hartmann, Alexander Mann, and Wolfgang Radenbach
Solution-space structure of (some) optimization problems
10 pages, 5 figures, Fig. 4 in reduced quality to reduce size, Proceedings of the International Workshop on Statistical-Mechanical Informatics 2007, Kyoto (Japan) September 16-19, 2007
null
10.1088/1742-6596/95/1/012011
null
cond-mat.dis-nn cond-mat.stat-mech
null
We study numerically the cluster structure of random ensembles of two NP-hard optimization problems originating in computational complexity, the vertex-cover problem and the number partitioning problem. We use branch-and-bound type algorithms to obtain exact solutions of these problems for moderate system sizes. Using two methods, direct neighborhood-based clustering and hierarchical clustering, we investigate the structure of the solution space. The main result is that the correspondence between solution structure and the phase diagrams of the problems is not unique. Namely, for vertex cover we observe a drastic change of the solution space from large single clusters to multiple nested levels of clusters. In contrast, for the number-partitioning problem, the phase space looks always very simple, similar to a random distribution of the lowest-energy configurations. This holds in the ``easy''/solvable phase as well as in the ``hard''/unsolvable phase.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 16:57:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Hartmann", "Alexander K.", "" ], [ "Mann", "Alexander", "" ], [ "Radenbach", "Wolfgang", "" ] ]
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711.3913
Harold Francke
Harold Francke, Eric Gawiser, Paulina Lira, Ezequiel Treister, Shanil Virani, Carie Cardamone, C.M. Urry, Pieter van Dokkum and Ryan Quadri (for the MUSYC Collaboration)
Clustering of Intermediate Luminosity X-ray selected AGN at z~3
Accepted for publication in ApJ Letters. 4 pages, 4 figures (1 in color)
null
10.1086/527318
null
astro-ph
null
We present the first clustering results of X-ray selected AGN at z~3. Using Chandra X-ray imaging and UVR optical colors from MUSYC photometry in the ECDF-S field, we selected a sample of 58 z~3 AGN candidates. From the optical data we also selected 1385 LBG at 2.8<z< 3.8 with R<25.5. We performed auto-correlation and cross-correlation analyses, and here we present results for the clustering amplitudes and dark matter halo masses of each sample. For the LBG we find a correlation length of r_0,LBG = 6.7 +/- 0.5 Mpc, implying a bias value of 3.5 +/- 0.3 and dark matter (DM) halo masses of log(Mmin/Msun) = 11.8 +/- 0.1. The AGN-LBG cross-correlation yields r_0,AGN-LBG = 8.7 +/- 1.9 Mpc, implying for AGN at 2.8<z<3.8 a bias value of 5.5 +/- 2.0 and DM halo masses of log(Mmin/Msun) = 12.6 +0.5/-0.8. Evolution of dark matter halos in the Lambda CDM cosmology implies that today these z~3 AGN are found in high mass galaxies with a typical luminosity of 7+4/-2 L*.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 06:20:56 GMT" } ]
2019-08-13T00:00:00
[ [ "Francke", "Harold", "", "for\n the MUSYC Collaboration" ], [ "Gawiser", "Eric", "", "for\n the MUSYC Collaboration" ], [ "Lira", "Paulina", "", "for\n the MUSYC Collaboration" ], [ "Treister", "Ezequiel", "", "for\n the MUSYC Collaboration" ], [ "Virani", "Shanil", "", "for\n the MUSYC Collaboration" ], [ "Cardamone", "Carie", "", "for\n the MUSYC Collaboration" ], [ "Urry", "C. M.", "", "for\n the MUSYC Collaboration" ], [ "van Dokkum", "Pieter", "", "for\n the MUSYC Collaboration" ], [ "Quadri", "Ryan", "", "for\n the MUSYC Collaboration" ] ]
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711.3914
Eric Lutz
Sebastian Deffner and Eric Lutz
Nonequilibrium work distribution of a quantum harmonic oscillator
6 pages, 3 figures
Phys. Rev. E 77, 021128 (2008)
10.1103/PhysRevE.77.021128
null
cond-mat.stat-mech
null
We analytically calculate the work distribution of a quantum harmonic oscillator with arbitrary time-dependent angular frequency. We provide detailed expressions for the work probability density for adiabatic and nonadiabatic processes, in the limit of low and high temperature. We further verify the validity of the quantum Jarzynski equality
[ { "version": "v1", "created": "Sun, 25 Nov 2007 18:14:30 GMT" } ]
2010-04-12T00:00:00
[ [ "Deffner", "Sebastian", "" ], [ "Lutz", "Eric", "" ] ]
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711.3915
Soummya Kar
Soummya Kar and Jos\'e M. F. Moura
Distributed Consensus Algorithms in Sensor Networks: Link Failures and Channel Noise
Final version to appear in a future issue of IEEE Transactions of Signal Processing
null
null
null
cs.IT cs.MA math.IT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper studies average consensus with random topologies (intermittent links) \emph{and} noisy channels. Consensus with noise in the network links leads to the bias-variance dilemma--running consensus for long reduces the bias of the final average estimate but increases its variance. We present two different compromises to this tradeoff: the $\mathcal{A-ND}$ algorithm modifies conventional consensus by forcing the weights to satisfy a \emph{persistence} condition (slowly decaying to zero); and the $\mathcal{A-NC}$ algorithm where the weights are constant but consensus is run for a fixed number of iterations $\hat{\imath}$, then it is restarted and rerun for a total of $\hat{p}$ runs, and at the end averages the final states of the $\hat{p}$ runs (Monte Carlo averaging). We use controlled Markov processes and stochastic approximation arguments to prove almost sure convergence of $\mathcal{A-ND}$ to the desired average (asymptotic unbiasedness) and compute explicitly the m.s.e. (variance) of the consensus limit. We show that $\mathcal{A-ND}$ represents the best of both worlds--low bias and low variance--at the cost of a slow convergence rate; rescaling the weights...
[ { "version": "v1", "created": "Sun, 25 Nov 2007 18:19:42 GMT" }, { "version": "v2", "created": "Mon, 8 Sep 2008 02:29:42 GMT" } ]
2008-09-08T00:00:00
[ [ "Kar", "Soummya", "" ], [ "Moura", "José M. F.", "" ] ]
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711.3916
Jennie D'Ambroise
Jennie D'Ambroise
A Schrodinger formulation of Bianchi I scalar field cosmology
null
null
null
null
hep-th
null
We show that the Bianchi I Einstein field equations in a perfect fluid scalar field cosmology are equivalent to a linear Schrodinger equation. This is achieved through a special case of the recent FLRW Schrodinger-type formulation, and provides an alternate method of obtaining exact solutions of the Bianchi I equations.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 18:34:39 GMT" } ]
2007-11-27T00:00:00
[ [ "D'Ambroise", "Jennie", "" ] ]
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711.3917
Brant M. Johnson
PHENIX Collaboration, A. Adare, et al
Cold Nuclear Matter Effects on J/Psi as Constrained by Deuteron-Gold Measurements at sqrt(s_NN) = 200 GeV
453 authors from 59 institutions, 15 pages, 13 figures, 5 tables. Submitted to Physical Review C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
Phys.Rev.C77:024912,2008; Erratum-ibid.C79:059901,2009
10.1103/PhysRevC.77.024912 10.1103/PhysRevC.79.059901
null
nucl-ex
null
We present a new analysis of J/psi production yields in deuteron-gold collisions at sqrt(s_NN) = 200 GeV using data taken by the PHENIX experiment in 2003 and previously published in [S.S. Adler et al., Phys. Rev. Lett 96, 012304 (2006)]. The high statistics proton-proton J/psi data taken in 2005 is used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors R_dAu. A suppression of J/psi in cold nuclear matter is observed as one goes forward in rapidity (in the deuteron-going direction), corresponding to a region more sensitive to initial state low-x gluons in the gold nucleus. The measured nuclear modification factors are compared to theoretical calculations of nuclear shadowing to which a J/psi (or precursor) break-up cross-section is added. Breakup cross sections of sigma_breakup = 2.8^[+1.7_-1.4] (2.2^[+1.6_-1.5]) mb are obtained by fitting these calculations to the data using two different models of nuclear shadowing. These breakup cross section values are consistent within large uncertainties with the 4.2 +/- 0.5 mb determined at lower collision energies. Projecting this range of cold nuclear matter effects to copper-copper and gold-gold collisions reveals that the current constraints are not sufficient to firmly quantify the additional hot nuclear matter effect.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 19:13:19 GMT" } ]
2014-11-18T00:00:00
[ [ "PHENIX Collaboration", "", "" ], [ "Adare", "A.", "" ] ]
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711.3918
Mikhail Bondarko
M.V. Bondarko
A problem with Artin's Vanishing for torsion motivic homology
The paper is suspended since Theorem 2.1.1 is wrong; hence the proofs of main results contain gaps. The author hopes to correct this; at least, most of the results follow from certain "standard" motivic conjectures
null
null
null
math.AG math.KT
null
The paper is suspended. The reason: as was noted by prof. H. Esnault, Theorem 2.1.1 of the previous version (as well as the related Theorem 6.1.1 of http://arxiv.org/PS_cache/math/pdf/9908/9908037v2.pdf of D. Arapura and P. Sastry) is wrong unless one assumes H to be a generic hyperplane section. Hence the proofs of all results starting from 2.3 contain gaps. The author hopes to correct this (somehow) in a future version. At least, most of the results follow from certain "standard" motivic conjectures (see part 1 of Remark 3.2.4 in the previous version). If the author would not find a way to prove Theorems 2.3.1 and 2.3.2 (without 2.1.1), then in the next version of the preprint the results of section 4 will be deduced from certain conjectures; certainly this is not a very exiting result.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:45:30 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 20:41:13 GMT" }, { "version": "v3", "created": "Mon, 10 Dec 2007 19:30:28 GMT" } ]
2007-12-10T00:00:00
[ [ "Bondarko", "M. V.", "" ] ]
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711.3919
Thomas B. Schlumprecht
R.Haydon, E.Odell, Th.Schlumprecht
Small Subspaces of L_p
null
null
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that if $X$ is a subspace of $L_p$ $(2<p<\infty)$, then either $X$ embeds isomorphically into $\ell_p \oplus \ell_2$ or $X$ contains a subspace $Y,$ which is isomorphic to $\ell_p(\ell_2)$. We also give an intrinsic characterization of when $X$ embeds into $\ell_p \oplus \ell_2$ in terms of weakly null trees in $X$ or, equivalently, in terms of the "infinite asymptotic game" played in $X$. This solves problems concerning small subspaces of $L_p$ originating in the 1970's. The techniques used were developed over several decades, the most recent being that of weakly null trees developed in the 2000's.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 19:01:23 GMT" }, { "version": "v2", "created": "Fri, 5 Mar 2010 20:27:00 GMT" } ]
2010-03-05T00:00:00
[ [ "Haydon", "R.", "" ], [ "Odell", "E.", "" ], [ "Schlumprecht", "Th.", "" ] ]
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711.392
Guillaume Bal
Guillaume Bal and Olivier Pinaud
Self-averaging of kinetic models for waves in random media
null
null
null
null
math-ph math.AP math.MP
null
Kinetic equations are often appropriate to model the energy density of high frequency waves propagating in highly heterogeneous media. The limitations of the kinetic model are quantified by the statistical instability of the wave energy density, i.e., by its sensitivity to changes in the realization of the underlying heterogeneous medium modeled as a random medium. In the simplified It\^o-Schr\"odinger regime of wave propagation, we obtain optimal estimates for the statistical instability of the wave energy density for different configurations of the source terms and the domains over which the energy density is measured. We show that the energy density is asymptotically statistically stable (self-averaging) in many configurations. In the case of highly localized source terms, we obtain an explicit asymptotic expression for the scintillation function in the high frequency limit.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 19:28:45 GMT" } ]
2007-11-27T00:00:00
[ [ "Bal", "Guillaume", "" ], [ "Pinaud", "Olivier", "" ] ]
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711.3921
Daniel P. Arovas
Daniel P. Arovas
Simplex solid states of SU(N) quantum antiferromagnets
14 pages, 8 figures, minor typos corrected
null
10.1103/PhysRevB.77.104404
null
cond-mat.str-el cond-mat.stat-mech
null
I define a set of wavefunctions for SU(N) lattice antiferromagnets, analogous to the valence bond solid states of Affleck, Kennedy, Lieb, and Tasaki (AKLT), in which the singlets are extended over N-site simplices. As with the valence bond solids, the new simplex solid (SS) states are extinguished by certain local projection operators, allowing us to construct Hamiltonians with local interactions which render the SS states exact ground states. Using a coherent state representation, we show that the quantum correlations in each SS state are calculable as the finite temperature correlations of an associated classical model, with N-spin interactions, on the same lattice. In three and higher dimensions, the SS states can spontaneously break SU(N) and exhibit N-sublattice long-ranged order, as a function of a discrete parameter which fixes the local representation of SU(N). I analyze this transition using a classical mean field approach. For N>2 the ordered state is selected via an "order by disorder" mechanism. As in the AKLT case, the bulk representations fractionalize at an edge, and the ground state entropy is proportional to the volume of the boundary.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 20:45:29 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 08:44:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Arovas", "Daniel P.", "" ] ]
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711.3922
Peter Goldreich
Junjun Liu, Peter Goldreich, David Stevenson
Constraints on Deep-seated Zonal Winds Inside Jupiter and Saturn
null
null
10.1016/j.icarus.2007.11.036
null
astro-ph
null
The atmospheres of Jupiter and Saturn exhibit strong and stable zonal winds. How deep the winds penetrate unabated into each planet is unknown. Our investigation favors shallow winds. It consists of two parts. The first part makes use of an Ohmic constraint; Ohmic dissipation associated with the planet's magnetic field cannot exceed the planet's net luminosity. Application to Jupiter (J) and Saturn (S) shows that the observed zonal winds cannot penetrate below a depth at which the electrical conductivity is about six orders of magnitude smaller than its value at the molecular-metallic transition. Measured values of the electrical conductivity of molecular hydrogen yield radii of maximum penetration of 0.96R_J and 0.86R_S, with uncertainties of a few percent of R. At these radii, the magnetic Reynolds number based on the zonal wind velocity and the scale height of the magnetic diffusivity is of order unity. These limits are insensitive to difficulties in modeling turbulent convection. They permit complete penetration along cylinders of the equatorial jets observed in the atmospheres of Jupiter and Saturn. The second part investigates how deep the observed zonal winds actually do penetrate. Truncation of the winds in the planet's convective envelope would involve breaking the Taylor-Proudman constraint on cylindrical flow. This would require a suitable nonpotential acceleration which none of the obvious candidates appears able to provide. Accelerations arising from entropy gradients, magnetic stresses, and Reynolds stresses appear to be much too weak. These considerations suggest that strong zonal winds are confined to shallow, stably stratified layers, with equatorial jets being the possible exception.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 19:54:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Junjun", "" ], [ "Goldreich", "Peter", "" ], [ "Stevenson", "David", "" ] ]
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711.3923
Hideo Hasegawa
Hideo Hasegawa (Tokyo Gakugei Univ.)
Stationary and dynamical properties of information entropies in nonextensive systems
31 pages, 15 figures; changed text and figures
Phys. Rev. E 77 (2008) 031133.
10.1103/PhysRevE.77.031133
null
cond-mat.stat-mech cond-mat.dis-nn
null
The Tsallis entropy and Fisher information entropy (matrix) are very important quantities expressing information measures in nonextensive systems. Stationary and dynamical properties of the information entropies have been investigated in the $N$-unit coupled Langevin model subjected to additive and multiplicative white noise, which is one of typical nonextensive systems. We have made detailed, analytical and numerical study on the dependence of the stationary-state entropies on additive and multiplicative noise, external inputs, couplings and number of constitutive elements ($N$). By solving the Fokker-Planck equation (FPE) by both the proposed analytical scheme and the partial difference-equation method, transient responses of the information entropies to an input signal and an external force have been investigated. We have calculated the information entropies also with the use of the probability distribution derived by the maximum-entropy method (MEM), whose result is compared to that obtained by the FPE. The Cram\'{e}r-Rao inequality is shown to be expressed by the {\it extended} Fisher entropy, which is different from the {\it generalized} Fisher entropy obtained from the generalized Kullback-Leibler divergence in conformity with the Tsallis entropy. The effect of additive and multiplicative {\it colored} noise on information entropies is discussed also.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 21:58:21 GMT" }, { "version": "v2", "created": "Sun, 2 Dec 2007 22:19:45 GMT" }, { "version": "v3", "created": "Wed, 19 Dec 2007 22:54:45 GMT" }, { "version": "v4", "created": "Sun, 20 Jan 2008 06:31:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Hasegawa", "Hideo", "", "Tokyo Gakugei Univ." ] ]
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711.3924
Florence Merlevede
J\'er\^ome Dedecker (LSTA), Florence Merlev\`ede (PMA), Magda Peligrad, Sergey Utev
Moderate deviations for stationary sequences of bounded random variables
null
null
null
null
math.PR math.ST stat.TH
null
In this paper we derive the moderate deviation principle for stationary sequences of bounded random variables under martingale-type conditions. Applications to functions of $\phi$-mixing sequences, contracting Markov chains, expanding maps of the interval, and symmetric random walks on the circle are given.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 20:34:02 GMT" } ]
2007-11-27T00:00:00
[ [ "Dedecker", "Jérôme", "", "LSTA" ], [ "Merlevède", "Florence", "", "PMA" ], [ "Peligrad", "Magda", "" ], [ "Utev", "Sergey", "" ] ]
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711.3925
J. Craig Wheeler
J. Craig Wheeler, Justyn R. Maund, Sean M. Couch
The Shape of Cas A
25 pages, 4 figures. Accepted for publication in the Astrophysical Journal
null
10.1086/528366
null
astro-ph
null
Based on optical, IR and X-ray studies of Cas A, we propose a geometry for the remnant based on a "jet-induced" scenario with significant systematic departures from axial symmetry. In this model, the main jet axis is oriented in the direction of strong blue-shifted motion at an angle of 110 - 120 degrees East of North and about 40 - 50 degrees to the East of the line of sight. Normal to this axis would be an expanding torus as predicted by jet-induced models. In the proposed geometry, iron-peak elements in the main jet-like flow could appear "beyond" the portions of the remnant rich in silicon by projection effects, not the effect of mixing. In the context of the proposed geometry, the displacement of the compact object from the kinematic center of the remnant at a position angle of ~169 degrees can be accommodated if the motion of the compact object is near to, but slightly off from, the direction of the main "jet" axis by of order 30 degrees. In this model, the classical NE "jet," the SW "counter-jet" and other protrusions, particularly the "hole" in the North, are non-asymmetric flows approximately in the equatorial plane, e.g., out through the perimeter of the expanding torus, rather than being associated with the main jet. We explore the spoke-like flow in the equatorial plane in terms of Rayleigh-Taylor, Richtmyer-Meshkov and Kelvin-Helmholz instabilities and illustrate these instabilities with a jet-induced simulation.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 21:39:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Wheeler", "J. Craig", "" ], [ "Maund", "Justyn R.", "" ], [ "Couch", "Sean M.", "" ] ]
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711.3926
Anand Sarwate
Anand D. Sarwate and Michael Gastpar
Rateless codes for AVC models
14 pages, double column, extended version of paper to appear in the IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The arbitrarily varying channel (AVC) is a channel model whose state is selected maliciously by an adversary. Fixed-blocklength coding assumes a worst-case bound on the adversary's capabilities, which leads to pessimistic results. This paper defines a variable-length perspective on this problem, for which achievable rates are shown that depend on the realized actions of the adversary. Specifically, rateless codes are constructed which require a limited amount of common randomness. These codes are constructed for two kinds of AVC models. In the first the channel state cannot depend on the channel input, and in the second it can. As a byproduct, the randomized coding capacity of the AVC with state depending on the transmitted codeword is found and shown to be achievable with a small amount of common randomness. The results for this model are proved using a randomized strategy based on list decoding.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 22:39:24 GMT" }, { "version": "v2", "created": "Tue, 10 Mar 2009 02:23:18 GMT" }, { "version": "v3", "created": "Sun, 2 Aug 2009 23:17:22 GMT" }, { "version": "v4", "created": "Mon, 5 Oct 2009 22:59:51 GMT" } ]
2009-10-06T00:00:00
[ [ "Sarwate", "Anand D.", "" ], [ "Gastpar", "Michael", "" ] ]
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711.3927
Christian Schnell
Christian Schnell
Primitive cohomology and the tube mapping
24 pages; result now holds for arbitrary dimension; uses Paul Taylor's package for commutative diagrams
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let X be a smooth complex projective variety of dimension d. We show that its primitive cohomology in degree d is generated by certain "tube classes," constructed from the monodromy of the family of smooth hyperplane sections on X. The proof makes use of a result about the group cohomology of certain representations that may be of independent interest.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 18:51:42 GMT" }, { "version": "v2", "created": "Sat, 21 Feb 2009 01:25:40 GMT" } ]
2009-02-21T00:00:00
[ [ "Schnell", "Christian", "" ] ]
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711.3928
Omar Lakkis
Alan Demlow, Omar Lakkis, Charalambos Makridakis
A posteriori error estimates in the maximum norm for parabolic problems
null
SIAM Journal on Numerical Analysis 2009 vol. 47 (3) pp. 2157-2176
10.1137/070708792
Sussex Mathematical Research Reports SMRR-07-04
math.NA math.AP
null
We derive a posteriori error estimates in the $L_\infty((0,T];L_\infty(\Omega))$ norm for approximations of solutions to linear para bolic equations. Using the elliptic reconstruction technique introduced by Makridakis and Nochetto and heat kernel estimates for linear parabolic pr oblems, we first prove a posteriori bounds in the maximum norm for semidiscrete finite element approximations. We then establish a posteriori bounds for a fully discrete backward Euler finite element approximation. The elliptic reconstruction technique greatly simplifies our development by allow\ ing the straightforward combination of heat kernel estimates with existing elliptic maximum norm error estimators.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 23:11:47 GMT" } ]
2011-04-06T00:00:00
[ [ "Demlow", "Alan", "" ], [ "Lakkis", "Omar", "" ], [ "Makridakis", "Charalambos", "" ] ]
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711.3929
Markus Mueller
Pierre Le Doussal, Markus Mueller and Kay Joerg Wiese
Cusps and shocks in the renormalized potential of glassy random manifolds: How Functional Renormalization Group and Replica Symmetry Breaking fit together
v2: Note added in proof
Phys. Rev. B 77, 064203 (2008) (39 pages)
10.1103/PhysRevB.77.064203
LPTENS 07/59
cond-mat.dis-nn cond-mat.stat-mech
null
We compute the Functional Renormalization Group (FRG) disorder- correlator function R(v) for d-dimensional elastic manifolds pinned by a random potential in the limit of infinite embedding space dimension N. It measures the equilibrium response of the manifold in a quadratic potential well as the center of the well is varied from 0 to v. We find two distinct scaling regimes: (i) a "single shock" regime, v^2 ~ 1/L^d where L^d is the system volume and (ii) a "thermodynamic" regime, v^2 ~ N. In regime (i) all the equivalent replica symmetry breaking (RSB) saddle points within the Gaussian variational approximation contribute, while in regime (ii) the effect of RSB enters only through a single anomaly. When the RSB is continuous (e.g., for short-range disorder, in dimension 2 <= d <= 4), we prove that regime (ii) yields the large-N FRG function obtained previously. In that case, the disorder correlator exhibits a cusp in both regimes, though with different amplitudes and of different physical origin. When the RSB solution is 1-step and non- marginal (e.g., d < 2 for SR disorder), the correlator R(v) in regime (ii) is considerably reduced, and exhibits no cusp. Solutions of the FRG flow corresponding to non-equilibrium states are discussed as well. In all cases the regime (i) exhibits a cusp non-analyticity at T=0, whose form and thermal rounding at finite T is obtained exactly and interpreted in terms of shocks. The results are compared with previous work, and consequences for manifolds at finite N, as well as extensions to spin glasses and related models are discussed.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 20:22:02 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 10:21:37 GMT" } ]
2008-02-22T00:00:00
[ [ "Doussal", "Pierre Le", "" ], [ "Mueller", "Markus", "" ], [ "Wiese", "Kay Joerg", "" ] ]
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711.393
Benoit Collins
Benoit Collins, Ken Dykema
On a reduction procedure for Horn inequalities in finite von Neumann algebras
39 pages
Oper. Matrices 3 (2009), no. 1, 1-40
10.7153/oam-03-01
null
math.OA
null
We consider the analogues of the Horn inequalities in finite von Neumann algebras, which concern the possible spectral distributions of sums $a+b$ of self--adjoint elements $a$ and $b$ in a finite von Neumann algebra. It is an open question whether all of these Horn inequalities must hold in all finite von Neumann algebras, and this is related to Connes' embedding problem. For each choice of integers $1\le r\le n$, there is a set $T^n_r$ of Horn triples, and the Horn inequalities are in one-to-one correspondence with $\cup_{1\le r\le n}T^n_r$. We consider a property P$_n$, analogous to one introduced by Therianos and Thompson in the case of matrices, amounting to the existence of projections having certain properties relative to arbitrary flags, which guarantees that a given Horn inequality holds in all finite von Neumann algebras. It is an open question whether all Horn triples in $T^n_r$ have property P$_n$. Certain triples in $T^n_r$ can be reduced to triples in $T^{n-1}_r$ by an operation we call {\em TT--reduction}. We show that property P$_n$ holds for the original triple if property P$_{n-1}$ holds for the reduced one. We then characterize the TT--irreducible Horn triples in $T^n_3$, for arbitrary $n$, and for those LR--minimal ones (namely, those having Littlewood--Richardson coefficient equal to 1), we perform a construction of projections with respect to flags in arbitrary von Neumann algebras in order to prove property P$_n$ for them. This shows that all LR--minimal triples in $\cup_{n\ge3}T^n_3$ have property P$_n$, and so that the corresponding Horn inequalities hold in all finite von Neumann algebras.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 23:46:48 GMT" } ]
2019-02-27T00:00:00
[ [ "Collins", "Benoit", "" ], [ "Dykema", "Ken", "" ] ]
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711.3931
Akimichi Takemura
Satoshi Kuriki and Akimichi Takemura
The tube method for the moment index in projection pursuit
null
Journal of Statistical Planning and Inference, Vol.138, No.9, 2749-2762. 2008.
10.1016/j.jspi.2008.03.010
null
math.ST stat.TH
null
The projection pursuit index defined by a sum of squares of the third and the fourth sample cumulants is known as the moment index proposed by Jones and Sibson. Limiting distribution of the maximum of the moment index under the null hypothesis that the population is multivariate normal is shown to be the maximum of a Gaussian random field with a finite Karhunen-Loeve expansion. An approximate formula for tail probability of the maximum, which corresponds to the p-value, is given by virtue of the tube method through determining Weyl's invariants of all degrees and the critical radius of the index manifold of the Gaussian random field.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 23:51:46 GMT" } ]
2008-06-02T00:00:00
[ [ "Kuriki", "Satoshi", "" ], [ "Takemura", "Akimichi", "" ] ]
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711.3932
Steven Duplij
A. Yu. Berezhnoy (NSC Kharkov Institute of Physics and Technology) and Steven Duplij (Kharkov National University)
Dependence of nucleotide physical properties on their placement in codons and determinative degree
13 pages, 8 figures, PDF
Journal of Zhejiang University SCIENCE (2005) Vol. 6B, No. 10, pp.948-960
10.1631/jzus.2005.B0948
null
q-bio.QM
null
Various physical properties such as dipole moment, heat of formation and energy of the most stable formation of nucleotides and bases were calculated by PM3 (modified neglect of diatomic overlap, parametric method number 3) and AM1 (Austin model 1) methods. As distinct from previous calculations, for nucleotides the interaction with neighbours is taken into account up to gradient of convergence equaling 1. The dependences of these variables from the place in the codon and the determinative degree were obtained. The difference of these variables for codons and anticodons is shown.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 00:17:57 GMT" } ]
2007-11-27T00:00:00
[ [ "Berezhnoy", "A. Yu.", "", "NSC Kharkov Institute of Physics and Technology" ], [ "Duplij", "Steven", "", "Kharkov National University" ] ]
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711.3933
Clifford Lam
Clifford Lam, Jianqing Fan
Sparsistency and rates of convergence in large covariance matrix estimation
Published in at http://dx.doi.org/10.1214/09-AOS720 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2009, Vol. 37, No. 6B, 4254-4278
10.1214/09-AOS720
IMS-AOS-AOS720
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the sparsistency and rates of convergence for estimating sparse covariance and precision matrices based on penalized likelihood with nonconvex penalty functions. Here, sparsistency refers to the property that all parameters that are zero are actually estimated as zero with probability tending to one. Depending on the case of applications, sparsity priori may occur on the covariance matrix, its inverse or its Cholesky decomposition. We study these three sparsity exploration problems under a unified framework with a general penalty function. We show that the rates of convergence for these problems under the Frobenius norm are of order $(s_n\log p_n/n)^{1/2}$, where $s_n$ is the number of nonzero elements, $p_n$ is the size of the covariance matrix and $n$ is the sample size. This explicitly spells out the contribution of high-dimensionality is merely of a logarithmic factor. The conditions on the rate with which the tuning parameter $\lambda_n$ goes to 0 have been made explicit and compared under different penalties. As a result, for the $L_1$-penalty, to guarantee the sparsistency and optimal rate of convergence, the number of nonzero elements should be small: $s_n'=O(p_n)$ at most, among $O(p_n^2)$ parameters, for estimating sparse covariance or correlation matrix, sparse precision or inverse correlation matrix or sparse Cholesky factor, where $s_n'$ is the number of the nonzero elements on the off-diagonal entries. On the other hand, using the SCAD or hard-thresholding penalty functions, there is no such a restriction.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 01:52:58 GMT" }, { "version": "v2", "created": "Sun, 24 Aug 2008 20:06:53 GMT" }, { "version": "v3", "created": "Fri, 20 Nov 2009 14:10:00 GMT" } ]
2009-11-20T00:00:00
[ [ "Lam", "Clifford", "" ], [ "Fan", "Jianqing", "" ] ]
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711.3934
Stefan Boettcher
Stefan Boettcher (Emory U), Helmut G. Katzgraber (ETH Zuerich), and David Sherrington (U of Oxford)
Local field distributions in spin glasses
17 pages, 34 eps-figs included, extensive updates and new results, as to appear in JPA, find related articles at http://www.physics.emory.edu/faculty/boettcher
J. Phys. A: Math. Theor. 41, 324007 (2008)
10.1088/1751-8113/41/32/324007
null
cond-mat.dis-nn cond-mat.stat-mech
null
Numerical results for the local field distributions of a family of Ising spin-glass models are presented. In particular, the Edwards-Anderson model in dimensions two, three, and four is considered, as well as spin glasses with long-range power-law-modulated interactions that interpolate between a nearest-neighbour Edwards-Anderson system in one dimension and the infinite-range Sherrington-Kirkpatrick model. Remarkably, the local field distributions only depend weakly on the range of the interactions and the dimensionality, and show strong similarities except for near zero local field.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 01:56:39 GMT" }, { "version": "v2", "created": "Sat, 2 Feb 2008 16:20:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Boettcher", "Stefan", "", "Emory U" ], [ "Katzgraber", "Helmut G.", "", "ETH Zuerich" ], [ "Sherrington", "David", "", "U of Oxford" ] ]
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711.3935
Andrea Montanari
Andrea Montanari and Ruediger Urbanke
Coding for Network Coding
12 pages, 2 ps figures
null
null
null
cs.IT cs.NI math.IT
null
We consider communication over a noisy network under randomized linear network coding. Possible error mechanism include node- or link- failures, Byzantine behavior of nodes, or an over-estimate of the network min-cut. Building on the work of Koetter and Kschischang, we introduce a probabilistic model for errors. We compute the capacity of this channel and we define an error-correction scheme based on random sparse graphs and a low-complexity decoding algorithm. By optimizing over the code degree profile, we show that this construction achieves the channel capacity in complexity which is jointly quadratic in the number of coded information bits and sublogarithmic in the error probability.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 02:38:01 GMT" } ]
2007-11-27T00:00:00
[ [ "Montanari", "Andrea", "" ], [ "Urbanke", "Ruediger", "" ] ]
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711.3936
Venkateswaran Krishnan
V. Krishnan
A Support Theorem for the Geodesic Ray Transform of Functions
6 pages, errors corrected, paper revised
null
null
null
math.DG math.AP
null
Let $(M,g)$ be a simple Riemannian manifold. Under the assumption that the metric $g$ is real-analytic, it is shown that if the geodesic ray transform of a function $f\in L^{2}(M)$ vanishes on an appropriate open set of geodesics, then $f=0$ on the set of points lying on these geodesics. The approach is based on a microlocal version of unique continuation of analytic functions.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 03:11:07 GMT" }, { "version": "v2", "created": "Sat, 29 Mar 2008 03:55:21 GMT" } ]
2008-03-29T00:00:00
[ [ "Krishnan", "V.", "" ] ]
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711.3937
Brian Connolly M.
S.Y. BenZvi, B.M. Connolly, and S. Westerhoff
Sequential Analysis Techniques for Correlation Studies in Particle Astronomy
16 pages, 8 figures, accepted by ApJ, updated and expanded
null
10.1086/592340
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Searches for statistically significant correlations between arrival directions of ultra-high energy cosmic rays and classes of astrophysical objects are common in astroparticle physics. We present a method to test potential correlation signals of a priori unknown strength and evaluate their statistical significance sequentially, i.e., after each incoming new event in a running experiment. The method can be applied to data taken after the test has concluded, allowing for further monitoring of the signal significance. It adheres to the likelihood principle and rigorously accounts for our ignorance of the signal strength.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 15:23:03 GMT" }, { "version": "v2", "created": "Sat, 2 Aug 2008 16:55:43 GMT" } ]
2009-11-13T00:00:00
[ [ "BenZvi", "S. Y.", "" ], [ "Connolly", "B. M.", "" ], [ "Westerhoff", "S.", "" ] ]
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711.3938
Yoshinobu Kuramashi
Yoshinobu Kuramashi
Nf=2+1 dynamical Wilson quark simulation toward the physical point
20 pages, 31 figures, 8 tables. Proceeding of the plenary talk at The XXV International Symposium on Lattice Field Theory, July 30-4 August 2007, Regensburg, Germany
PoSLAT2007:017,2007
null
null
hep-lat
null
We present preliminary results of the PACS-CS project which simulates 2+1 flavor lattice QCD toward the physical point with the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action. Calculations are carried out at beta=1.9 on a 32^3x64 lattice with the use of the domain-decomposed HMC algorithm to reduce the up-down quark mass. The resulting pseudoscalar meson masses range from 730 MeV down to 210 MeV. We discuss the physical results including the chiral analysis in the pseudoscalar meson sector and the hadron spectrum. Some algorithmic issues are also discussed.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 03:21:43 GMT" } ]
2009-04-14T00:00:00
[ [ "Kuramashi", "Yoshinobu", "" ] ]
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711.3939
Jiangbin Gong Prof.
Jiao Wang and Jiangbin Gong (National Univ. of Singapore)
Proposal of a Cold-atom Realization of Quantum Maps with Hofstadter's Butterfly Spectrum
5 pages, 4 figures, minor changes, to appear in Phys. Rev. A (Rapid Communication)
Phys. Rev. A 77, 031405 (Rapid Communication), 2008
10.1103/PhysRevA.77.031405
null
quant-ph cond-mat.other nlin.CD
null
Quantum systems with Hofstadter's butterfly spectrum are of fundamental interest to many research areas. Based upon slight modifications of existing cold-atom experiments, a cold-atom realization of quantum maps with Hofstadter's butterfly spectrum is proposed. Connections and differences between our realization and the kicked Harper model are identified. This work also exposes, for the first time, a simple connection between the kicked Harper model and the kicked rotor model, the two paradigms of classical and quantum chaos.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 03:59:46 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 02:40:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Jiao", "", "National Univ. of Singapore" ], [ "Gong", "Jiangbin", "", "National Univ. of Singapore" ] ]
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711.394
Joseph B. Keller Prof.
Joseph B. Keller
A recursion equation for prime numbers
2 pages; replacement 10/05/2008 corrects typographical error page 2, reference #1, author last name
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that the first $n$ prime numbers $p_1,...,p_n$ determine the next one by the recursion equation $$ p_{n+1} =\lim\limits_{s\to +\infty} [\prod\limits^n_{k=1} (1-\frac{1}{p^s_k}) \sum\limits^\infty_{j=1} \frac{1}{j^s} -1]^{-1/s}. $$ The upper limit on the sum can be replaced by $2p_n -1$, and the result still holds.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:18:30 GMT" }, { "version": "v2", "created": "Sun, 5 Oct 2008 21:03:04 GMT" } ]
2008-10-06T00:00:00
[ [ "Keller", "Joseph B.", "" ] ]
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711.3941
David Garber
David Garber
Braid Group Cryptography
75 pages, 19 figures; An almost final version of lectures notes for lectures given in Braid PRIMA school in Singapore, June 2007. This version is a totally revised version
null
null
null
cs.CR math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last decade, a number of public key cryptosystems based on com- binatorial group theoretic problems in braid groups have been proposed. We survey these cryptosystems and some known attacks on them. This survey includes: Basic facts on braid groups and on the Garside normal form of its elements, some known algorithms for solving the word problem in the braid group, the major public-key cryptosystems based on the braid group, and some of the known attacks on these cryptosystems. We conclude with a discussion of future directions (which includes also a description of cryptosystems which are based on other non-commutative groups).
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:16:01 GMT" }, { "version": "v2", "created": "Sat, 27 Sep 2008 19:15:38 GMT" } ]
2009-09-29T00:00:00
[ [ "Garber", "David", "" ] ]
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711.3942
Hong-Jian Feng
Hong-Jian Feng
Electronic structures and lattice dynamics of BaTiO3 and BiFeO3 : a comparative first-principles study
This paper has been withdrawn by the author due to crucial errors
null
null
null
cond-mat.mtrl-sci cond-mat.str-el
null
First-principles calculations were performed to investigate the ferroelectric properties of barium titanate and bismuth ferrite, as well as phonon dispersion of BaTiO3, using density functional theory and density functional perturbation theory. Results show that the strong hybridization of Ti-O and Bi-O lead to the corresponding mechanisms for stabilizing the distorted structure. The spontaneous polarization of 59.4 \mu C/cm2 and 27.6 \mu C/cm2 were calculated for BiFeO3 and BaTiO3 respectively, using berry phase method within the modern theory of polarization. The stereochemical activity of Bi-6s long-pair, which was the driven mechanism for ferroelectricity in BiFeO3, was able to produce greater polarization than the Ti off-centring displacement in BaTiO3. New multiferroic perovskite type materials combined with these two ferroelectric instabilities were predicted to have a better ferromagnetic ordering in comparison with BiFeO3.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:33:10 GMT" }, { "version": "v2", "created": "Sun, 16 Dec 2012 15:15:36 GMT" }, { "version": "v3", "created": "Fri, 5 Dec 2014 16:40:19 GMT" } ]
2014-12-08T00:00:00
[ [ "Feng", "Hong-Jian", "" ] ]
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711.3943
M. E. Carrington
M.E. Carrington, A. Gynther and P. Aurenche
Energetic di-leptons from the Quark Gluon Plasma
12 pages, 10 figures
Phys.Rev.D77:045035,2008
10.1103/PhysRevD.77.045035
null
hep-ph
null
In this paper we study the production of energetic di-leptons. We calculate the rate for 2 $\to$ 2 processes. The log term is obtained analytically and the constant term is calculated numerically. When the photon mass is of the order of the thermal quark mass, the result is insensitive to the photon mass and the soft logarithmic divergence is regulated by the thermal quark mass, exactly as in the case of real photons. We also consider the production of thermal Drell-Yan dileptons (thermal quark and antiquark pairs produced by virtual photons) and calculate the rate systematically in the context of the hard thermal loop effective theory. We obtain analytic and numerical results. We compare our results with those of previous calculations.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:34:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Carrington", "M. E.", "" ], [ "Gynther", "A.", "" ], [ "Aurenche", "P.", "" ] ]
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711.3944
Angela Ortega
L. Brambila-Paz, Angela Ortega
Tensor product of coherent systems
22 pages
null
null
null
math.AG
null
Let X be a smooth algebraic curve of genus g>=2. A stable vector bundle over X of degree d, rank n with at least k sections is called a Brill-Noether bundle of type (n,d,k). By tensoring coherent systems, we prove that most of the known Brill-Noether bundles define coherent systems of type (n,d,k) that are alpha-stables for all allowable alpha .
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:36:42 GMT" } ]
2007-11-27T00:00:00
[ [ "Brambila-Paz", "L.", "" ], [ "Ortega", "Angela", "" ] ]
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711.3945
Joseph B. Keller Prof.
Joseph B. Keller
Piecewise Linear Phase Transitions
4 pages, 1 figure
null
null
null
math-ph math.MP
null
It is shown how simple assumptions lead to piecewise linear behavior, which is observed in certain phase transitions.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:40:40 GMT" } ]
2007-11-27T00:00:00
[ [ "Keller", "Joseph B.", "" ] ]
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711.3946
Hiroaki Isobe
H. Isobe, M. Kubo, T. Minoshima, K. Ichimoto, Y. Katsukawa, T. D. Tarbell, S. Tsuneta, T. E. Berger, B. W. Lites, S. Nagata, T. Shimizu, R. A. Shine, Y. Suematsu, A. Title
Flare Ribbons Observed with G-band and FeI 6302A Filters of the Solar Optical Telescope on Board Hinode
14 pages, 7 figures, PASJ in press
null
10.1093/pasj/59.sp3.S807
null
astro-ph
null
The Solar Optical Telescope (SOT) on board Hinode satellite observed an X3.4 class flare on 2006 December 13. Typical two-ribbon structure was observed, not only in the chromospheric CaII H line but also in G-band and FeI 6302A line. The high-resolution, seeing-free images achieved by SOT revealed, for the first time, the sub-arcsec fine structures of the "white light" flare. The G-band flare ribbons on sunspot umbrae showed a sharp leading edge followed by a diffuse inside, as well as previously known core-halo structure. The underlying structures such as umbral dots, penumbral filaments and granules were visible in the flare ribbons. Assuming that the sharp leading edge was directly heated by particle beam and the diffuse parts were heated by radiative back-warming, we estimate the depth of the diffuse flare emission using the intensity profile of the flare ribbon. We found that the depth of the diffuse emission is about 100 km or less from the height of the source of radiative back-warming. The flare ribbons were also visible in the Stokes-V images of FeI 6302A, as a transient polarity reversal. This is probably related to "magnetic transient" reported in the literature. The intensity increase in Stokes-I images indicates that the FeI 6302A line was significantly deformed by the flare, which may cause such a magnetic transient.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 05:55:21 GMT" } ]
2015-05-13T00:00:00
[ [ "Isobe", "H.", "" ], [ "Kubo", "M.", "" ], [ "Minoshima", "T.", "" ], [ "Ichimoto", "K.", "" ], [ "Katsukawa", "Y.", "" ], [ "Tarbell", "T. D.", "" ], [ "Tsuneta", "S.", "" ], [ "Berger", "T. E.", "" ], [ "Lites", "B. W.", "" ], [ "Nagata", "S.", "" ], [ "Shimizu", "T.", "" ], [ "Shine", "R. A.", "" ], [ "Suematsu", "Y.", "" ], [ "Title", "A.", "" ] ]
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711.3947
Miloslav Znojil
Jun-Hua Chen, Edita Pelantova and Miloslav Znojil
Classification of the conditionally observable spectra exhibiting central symmetry
10 pp. 3 figures
Phys. Lett. A 372 (2008) 1986 - 1989
10.1016/j.physleta.2007.11.015
null
math-ph math.MP
null
We show how in PT-symmetric 2J-level quantum systems the assumption of an upside-down symmetry (or duality) of their spectra simplifies their classification based on the non-equivalent pairwise mergers of the energy levels.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 06:02:28 GMT" } ]
2008-03-06T00:00:00
[ [ "Chen", "Jun-Hua", "" ], [ "Pelantova", "Edita", "" ], [ "Znojil", "Miloslav", "" ] ]
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711.3948
Joseph B. Keller Prof.
Joseph B. Keller
Multiple eigenvalues
19 pages, 1 figure, 2 tables
null
null
null
math.NA
null
The dimensions of sets of matrices of various types, with specified eigenvalue multiplicities, are determined. The dimensions of the sets of matrices with given Jordan form and with given singular value multiplicities are also found. Each corresponding codimension is the number of conditions which a matrix of the given type must satisfy in order to have the specified multiplicities.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 06:03:03 GMT" } ]
2007-11-27T00:00:00
[ [ "Keller", "Joseph B.", "" ] ]
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711.3949
Lei Ni
Lei Ni, Aaron Harwood
An Adaptive Checkpointing Scheme for Peer-to-Peer Based Volunteer Computing Work Flows
null
null
null
null
cs.DC
null
Volunteer Computing, sometimes called Public Resource Computing, is an emerging computational model that is very suitable for work-pooled parallel processing. As more complex grid applications make use of work flows in their design and deployment it is reasonable to consider the impact of work flow deployment over a Volunteer Computing infrastructure. In this case, the inter work flow I/O can lead to a significant increase in I/O demands at the work pool server. A possible solution is the use of a Peer-to- Peer based parallel computing architecture to off-load this I/O demand to the workers; where the workers can fulfill some aspects of work flow coordination and I/O checking, etc. However, achieving robustness in such a large scale system is a challenging hurdle towards the decentralized execution of work flows and general parallel processes. To increase robustness, we propose and show the merits of using an adaptive checkpoint scheme that efficiently checkpoints the status of the parallel processes according to the estimation of relevant network and peer parameters. Our scheme uses statistical data observed during runtime to dynamically make checkpoint decisions in a completely de- centralized manner. The results of simulation show support for our proposed approach in terms of reduced required runtime.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 06:41:23 GMT" } ]
2007-11-27T00:00:00
[ [ "Ni", "Lei", "" ], [ "Harwood", "Aaron", "" ] ]
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711.395
Masaki Asano
Masaki Asano, Shigeki Matsumoto, Masato Senami, Hiroaki Sugiyama
Neutralino Dark Matter in Light Higgs Boson Scenario
11 pages, 4 figures; references and 1 figure added, version to appear in Phys. Lett. B
Phys.Lett.B663:330-333,2008
10.1016/j.physletb.2008.04.042
KEK-TH-1204, TU-785, SISSA 86/2007/EP
hep-ph
null
Phenomenology of neutralino dark matter in the minimal supersymmetric model is discussed for a scenario where the lightest Higgs boson mass is lighter than 114.4 GeV. We show that the scenario is consistent not only with many collider experiments but also with the observed relic abundance of dark matter. The allowed region may be probed by experiments of Bs to mu^+ mu^- in near future. The scenario predicts a large scattering cross section between the dark matter and ordinary matter and thus it may be tested in present direct detection experiments of dark matter.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:17:35 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 05:16:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Asano", "Masaki", "" ], [ "Matsumoto", "Shigeki", "" ], [ "Senami", "Masato", "" ], [ "Sugiyama", "Hiroaki", "" ] ]
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711.3951
Seung Woo Ham
S.W. Ham, S.G. Jo, S.K. OH, and D. Son
The Higgs search of the MSSM with explicit CP violation at the LHC and ILC
20 pages, 3 figures
null
null
null
hep-ph
null
We study the neutral Higgs sector of the minimal supersymmetric standard model (MSSM) with explicit CP violation at the one-loop level. We take into account the one-loop contributions by the top quark, the stop quarks, the bottom quark, the sbottom quarks, the tau lepton, the stau leptons, the $W$ boson, the charged Higgs boson, the charginos, the $Z$ boson, the neutral Higgs bosons, and the neutralinos. The production cross sections of the neutral Higgs boson are calculated to the leading order. The processes in our consideration are divided in two groups: the Higgs-strahlung and gluon fusion processes accessible at the CERN Large Hadron Collider (LHC), and the vector boson fusion and Higgs-strahlung processes accessible at the $e^+e^-$ International Linear Collider (ILC). In particular, we investigate the dependence of these processes on the CP phase arising from the U(1) factor of the gaugino mass in the neutralino mass matrix. We show that the cross sections of these processes vary by the range of 3% $-$ 19 % as the CP phase changes from zero to $\pi$.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 06:44:22 GMT" } ]
2007-11-27T00:00:00
[ [ "Ham", "S. W.", "" ], [ "Jo", "S. G.", "" ], [ "OH", "S. K.", "" ], [ "Son", "D.", "" ] ]
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711.3952
Hiroaki Isobe
H. Isobe, D. Tripathi, A. Asai, R. Jain
Large-Amplitude Oscillation of an Erupting Filament as Seen in EUV, H-alpha and Microwave Observations
12 pages, 5 figures, Solar Physics in press
null
10.1007/s11207-007-9091-6
null
astro-ph
null
We present multiwavelength observations of a large-amplitude oscillation of a polar crown filament on 15 October 2002. The oscillation occurred during the slow rise (about 1 km/s) of the filament. It completed three cycles before sudden acceleration and eruption. The oscillation and following eruption were clearly seen in observations recorded by the Extreme-Ultraviolet Imaging Telescope onboard SOHO. The oscillation was seen only in a part of the filament, and it appears to be a standing oscillation rather than a propagating wave. The period of oscillation was about two hours and did not change significantly during the oscillation. We also identified the oscillation as a "winking filament" in the H-alpha images taken by the Flare Monitoring Telescope, and as a spatial displacement in 17 GHz microwave images from Nobeyama Radio Heliograph (NoRH). The filament oscillation seems to be triggered by magnetic reconnection between a filament barb and nearby emerging magnetic flux as was evident from the MDI magnetogram observations. No flare was observed to be associated with the onset of the oscillation. We also discuss possible implications of the oscillation as a diagnostic tool for the eruption mechanisms. We suggest that in the early phase of eruption a part of the filament lost its equilibrium first, while the remaining part was still in an equilibrium and oscillated.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:03:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Isobe", "H.", "" ], [ "Tripathi", "D.", "" ], [ "Asai", "A.", "" ], [ "Jain", "R.", "" ] ]
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711.3953
Matthew Lightman
Matthew Lightman
K to pi pi Amplitudes at Unphysical Kinematics Using Domain Wall Fermions
7 pages, 4 figures, Talk presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany
PoSLAT2007:360,2007
null
null
hep-lat
null
The use of chiral perturbation theory in extracting physical K to pi pi matrix elements from matrix elements calculated at unphysical kinematics is outlined. In particular, the possibility of utilizing pions with non-zero momentum in the final state, and of using partial quenching is discussed. Preliminary (not physically normalized) Delta I=3/2 (27,1) K to pi pi matrix elements are calculated on the RBC/UKQCD $24^3 \times 64$, $L_s=16$ lattices, using 2+1 dynamical flavors and domain wall fermions, with an inverse lattice spacing of $a^{-1}=1.729(28) GeV$. Effective mass plots are presented for a light sea quark mass of $m_l^{sea}=0.005$, and various valence quark masses. The plateaux are fit and $E_{\pi\pi}-m_K$ is extracted.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 06:54:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Lightman", "Matthew", "" ] ]
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711.3954
Richard Ignace
R. Ignace, L.M. Oskinova, W.L. Waldron, J.L. Hoffman, W.-R. Hamann
Phase-dependent X-ray observations of the beta Lyrae system: No eclipse in the soft band
to appear in A&A Letters
null
10.1051/0004-6361:20078871
null
astro-ph
null
We report on observations of the eclipsing and interacting binary beta Lyrae from the Suzaku X-ray telescope. This system involves an early B star embedded in an optically and geometrically thick disk that is siphoning atmospheric gases from a less massive late B II companion. Motivated by an unpublished X-ray spectrum from the Einstein X-ray telescope suggesting unusually hard emission, we obtained time with Suzaku for pointings at three different phases within a single orbit. From the XIS detectors, the softer X-ray emission appears typical of an early-type star. What is surprising is the remarkably unchanging character of this emission, both in luminosity and in spectral shape, despite the highly asymmetric geometry of the system. We see no eclipse effect below 10 keV. The constancy of the soft emission is plausibly related to the wind of the embedded B star and Thomson scattering of X-rays in the system, although it might be due to extended shock structures arising near the accretion disk as a result of the unusually high mass-transfer rate. There is some evidence from the PIN instrument for hard emission in the 10-60 keV range. Follow-up observations with the RXTE satellite will confirm this preliminary detection.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 16:22:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Ignace", "R.", "" ], [ "Oskinova", "L. M.", "" ], [ "Waldron", "W. L.", "" ], [ "Hoffman", "J. L.", "" ], [ "Hamann", "W. -R.", "" ] ]
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711.3955
I. Castillo
I. Castillo
Semi-parametric second-order efficient estimation of the period of a signal
Published in at http://dx.doi.org/10.3150/07-BEJ5077 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Bernoulli 2007, Vol. 13, No. 4, 910-932
10.3150/07-BEJ5077
IMS-BEJ-BEJ5077
math.ST stat.TH
null
This paper is concerned with the estimation of the period of an unknown periodic function in Gaussian white noise. A class of estimators of the period is constructed by means of a penalized maximum likelihood method. A second-order asymptotic expansion of the risk of these estimators is obtained. Moreover, the minimax problem for the second-order term is studied and an estimator of the preceding class is shown to be second order efficient.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:13:27 GMT" } ]
2011-11-10T00:00:00
[ [ "Castillo", "I.", "" ] ]
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711.3956
Sergey Kulagin
S. A. Kulagin and R. Petti
Nuclear Effects in Neutrino Structure Functions
8 pages, 2 figures, to appear in the proceedings of 5th International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt07), Batavia, Illinois, 30 May - 3 Jun 2007
AIP Conf.Proc.967:94-101,2007
10.1063/1.2834518
null
nucl-th
null
We discuss calculation of nuclear corrections to the structure functions for the deep-inelastic scattering of muon and (anti)neutrino. Our approach includes a QCD description of the nucleon structure functions as well as the treatment of Fermi motion and nuclear binding, off-shell correction to bound nucleon structure functions, nuclear pion excess and nuclear shadowing. We emphasize the dependence of nuclear effects on the type and C-parity of (anti)neutrino structure functions. We also examine the interplay between different nuclear effects in the Adler and the Gross-Llewellyn-Smith sum rules for nuclei.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 08:19:19 GMT" } ]
2014-11-18T00:00:00
[ [ "Kulagin", "S. A.", "" ], [ "Petti", "R.", "" ] ]
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711.3957
Nakahiro Yoshida
Yury A. Kutoyants, Nakahiro Yoshida
Moment estimation for ergodic diffusion processes
Published in at http://dx.doi.org/10.3150/07-BEJ1040 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Bernoulli 2007, Vol. 13, No. 4, 933-951
10.3150/07-BEJ1040
IMS-BEJ-BEJ1040
math.ST stat.TH
null
We investigate the moment estimation for an ergodic diffusion process with unknown trend coefficient. We consider nonparametric and parametric estimation. In each case, we present a lower bound for the risk and then construct an asymptotically efficient estimator of the moment type functional or of a parameter which has a one-to-one correspondence to such a functional. Next, we clarify a higher order property of the moment type estimator by the Edgeworth expansion of the distribution function.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:34:35 GMT" } ]
2011-11-10T00:00:00
[ [ "Kutoyants", "Yury A.", "" ], [ "Yoshida", "Nakahiro", "" ] ]
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711.3958
Frederic Maffray
Jen\"o Lehel, Fr\'ed\'eric Maffray (LGS), Myriam Preissmann (LGS)
Maximum directed cuts in digraphs with degree restriction
null
null
null
null
cs.DM
null
For integers m,k >= 1, we investigate the maximum size of a directed cut in directed graphs in which there are m edges and each vertex has either indegree at most k or outdegree at most k.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:38:36 GMT" } ]
2007-11-29T00:00:00
[ [ "Lehel", "Jenö", "", "LGS" ], [ "Maffray", "Frédéric", "", "LGS" ], [ "Preissmann", "Myriam", "", "LGS" ] ]
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711.3959
Frederic Maffray
Fr\'ed\'eric Maffray (LGS), Meriem Mechebbek
On b-perfect chordal graphs
null
null
null
null
cs.DM
null
The b-chromatic number of a graph G is the largest integer k such that G has a coloring of the vertices in k color classes such that every color class contains a vertex that has a neighbour in all other color classes. We characterize the class of chordal graphs for which the b-chromatic number is equal to the chromatic number for every induced subgraph.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:39:19 GMT" } ]
2007-11-27T00:00:00
[ [ "Maffray", "Frédéric", "", "LGS" ], [ "Mechebbek", "Meriem", "" ] ]
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711.396
Roman Orus
Roman Orus, Guifre Vidal
The iTEBD algorithm beyond unitary evolution
11 pages, 16 figures, 1 appendix with algorithms for specific types of evolution. A typo in the appendix figures has been corrected. Accepted in PRB
Phys. Rev. B 78, 155117 (2008)
10.1103/PhysRevB.78.155117
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The infinite time-evolving block decimation (iTEBD) algorithm [Phys. Rev. Lett. 98, 070201 (2007)] allows to simulate unitary evolution and to compute the ground state of one-dimensional quantum lattice systems in the thermodynamic limit. Here we extend the algorithm to tackle a much broader class of problems, namely the simulation of arbitrary one-dimensional evolution operators that can be expressed as a (translationally invariant) tensor network. Relatedly, we also address the problem of finding the dominant eigenvalue and eigenvector of a one-dimensional transfer matrix that can be expressed in the same way. New applications include the simulation, in the thermodynamic limit, of open (i.e. master equation) dynamics and thermal states in 1D quantum systems, as well as calculations with partition functions in 2D classical systems, on which we elaborate. The present extension of the algorithm also plays a prominent role in the infinite projected entangled-pair states (iPEPS) approach to infinite 2D quantum lattice systems.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:50:06 GMT" }, { "version": "v2", "created": "Mon, 21 Jul 2008 07:35:30 GMT" }, { "version": "v3", "created": "Mon, 29 Sep 2008 05:38:05 GMT" }, { "version": "v4", "created": "Fri, 13 Mar 2009 07:06:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Orus", "Roman", "" ], [ "Vidal", "Guifre", "" ] ]
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711.3961
Guendelman Eduardo I
E.I. Guendelman
Axion Photon Oscillations From a "Particle-Antiparticle" View Point
6 pages, latex
null
null
null
hep-ph
null
We observe that it is very usefull to introduce a complex field for the axion photon system in an external magnetic field, when for example considered with the geometry of the experiments exploring axion photon mixing, where the real part is the axion and the imaginary part is the photon polarization that couples to the axion when the magnetic field is present. In the absence of the external magnetic field, the theory displays charge conjugation symmetry. In this formulation the axion and photon are the symmetric and antisymmetric combinations of particle and antiparticle (as defined from the complex field) respectively and they do not mix if the external magnetic field is set to zero. The magnetic field interaction is seen to be equivalent to first order to the interaction of the complex charged field with an external electric potential, where this ficticious "electric potential" is proportional to the external magnetic field. This interaction breaks the charge conjugation symmetry and therefore symmetric and antysymmetric combinations are not mantained in time. As a result one obtains axion photon mixing in the presence of an external magnetic field, a well known result understood in a different way.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 07:56:43 GMT" } ]
2007-11-27T00:00:00
[ [ "Guendelman", "E. I.", "" ] ]
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711.3962
C. A. Dominguez
C. A. Dominguez, N. F. Nasrallah, K. Schilcher
Strange quark condensate from QCD sum rules to five loops
Minor changes to Sections 2 and 6
JHEP 0802:072,2008
10.1088/1126-6708/2008/02/072
UCT-TP-269/07, MZ-TH/07-15
hep-ph
null
It is argued that it is valid to use QCD sum rules to determine the scalar and pseudoscalar two-point functions at zero momentum, which in turn determine the ratio of the strange to non-strange quark condensates $R_{su} = \frac{<\bar{s} s>}{<\bar{q} q>}$ with ($q=u,d$). This is done in the framework of a new set of QCD Finite Energy Sum Rules (FESR) that involve as integration kernel a second degree polynomial, tuned to reduce considerably the systematic uncertainties in the hadronic spectral functions. As a result, the parameters limiting the precision of this determination are $\Lambda_{QCD}$, and to a major extent the strange quark mass. From the positivity of $R_{su}$ there follows an upper bound on the latter: $\bar{m_{s}} (2 {GeV}) \leq 121 (105) {MeV}$, for $\Lambda_{QCD} = 330 (420) {MeV} .$
[ { "version": "v1", "created": "Mon, 26 Nov 2007 08:00:41 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 13:07:33 GMT" } ]
2009-01-06T00:00:00
[ [ "Dominguez", "C. A.", "" ], [ "Nasrallah", "N. F.", "" ], [ "Schilcher", "K.", "" ] ]
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711.3963
Michael Joyce
Andrea Gabrielli, Michael Joyce and Salvatore Torquato
Tilings of space and superhomogeneous point processes
13 pages, 2 figures
null
10.1103/PhysRevE.77.031125
null
cond-mat.stat-mech astro-ph cond-mat.mtrl-sci
null
We consider the construction of point processes from tilings, with equal volume tiles, of d-dimensional Euclidean space. We show that one can generate, with simple algorithms ascribing one or more points to each tile, point processes which are "superhomogeneous'' (or "hyperuniform''), i.e., for which the structure factor S(k) vanishes when the wavenumber k tends to zero. The exponent of the leading small-k behavior depends in a simple manner on the nature of the correlation properties of the specific tiling and on the conservation of the mass moments of the tiles. Assigning one point to the center of mass of each tile gives the exponent \gamma=4 for any tiling in which the shapes and orientations of the tiles are short-range correlated. Smaller exponents, in the range 4-d<\gamma<4 (and thus always superhomogeneous for d\leq 4), may be obtained in the case that the latter quantities have long-range correlations. Assigning more than one point to each tile in an appropriate way, we show that one can obtain arbitrarily higher exponents in both cases. We illustrate our results with explicit constructions using known deterministic tilings, as well as some simple stochastic tilings for which we can calculate S(k) exactly. Our results provide, we believe, the first explicit analytical construction of point processes with \gamma > 4. Applications to condensed matter physics, and also to cosmology, are briefly discussed.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 08:07:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Gabrielli", "Andrea", "" ], [ "Joyce", "Michael", "" ], [ "Torquato", "Salvatore", "" ] ]
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711.3964
Cristobald de Kerchove
Cristobald de Kerchove, Paul Van Dooren
Iterative Filtering for a Dynamical Reputation System
10 pages, 11 figures
null
null
null
cs.IR
null
The paper introduces a novel iterative method that assigns a reputation to n + m items: n raters and m objects. Each rater evaluates a subset of objects leading to a n x m rating matrix with a certain sparsity pattern. From this rating matrix we give a nonlinear formula to define the reputation of raters and objects. We also provide an iterative algorithm that superlinearly converges to the unique vector of reputations and this for any rating matrix. In contrast to classical outliers detection, no evaluation is discarded in this method but each one is taken into account with different weights for the reputation of the objects. The complexity of one iteration step is linear in the number of evaluations, making our algorithm efficient for large data set. Experiments show good robustness of the reputation of the objects against cheaters and spammers and good detection properties of cheaters and spammers.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 08:12:51 GMT" } ]
2007-11-27T00:00:00
[ [ "de Kerchove", "Cristobald", "" ], [ "Van Dooren", "Paul", "" ] ]
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711.3965
Ling Zhou
Ling Zhou, Han Xiong
Macroscopical Entangled Coherent State Generator in V configuration atom system
null
null
10.1088/0953-4075/41/2/025501
null
quant-ph
null
In this paper, we propose a scheme to produce pure and macroscopical entangled coherent state. When a three-level ''V'' configuration atom interacts with a doubly reasonant cavity, under the strong classical driven condition, entangled coherent state can be generated from vacuum fields. An analytical solution for this system under the presence of cavity losses is also given.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 08:37:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhou", "Ling", "" ], [ "Xiong", "Han", "" ] ]
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711.3966
Mark Levene
Trevor Fenner, Mark Levene and George Loizou
Modelling the Navigation Potential of a Web Page
12 pages, 3 figures, 1 table
null
null
null
physics.soc-ph
null
Suppose that you are navigating in ``hyperspace'' and you have reached a web page with several outgoing links you could choose to follow. Which link should you choose in such an online scenario? When you are not sure where the information you require resides, you will initiate a navigation session. This involves pruning some of the links and following one of the others, where more pruning is likely to happen the deeper you navigate. In terms of decision making, the utility of navigation diminishes with distance until finally the utility drops to zero and the session is terminated. Under this model of navigation, we call the number of nodes that are available after pruning, for browsing within a session, the {\em potential gain} of the starting web page. Thus the parameters that effect the potential gain are the local branching factor with respect to the starting web page and the discount factor. We first consider the case when the discounting factor is geometric. We show that the distribution of the effective number of links that the user can follow at each navigation step after pruning, i.e. the number of nodes added to the potential gain at that step, is given by the {\em erf} function. We derive an approximation to the potential gain of a web page and show that this is numerically a very accurate estimate. We then consider a harmonic discounting factor and show that, in this case, the potential gain at each step is closely related to the probability density function for the Poisson distribution. The potential gain has been applied to web navigation where it helps the user to choose a good starting point for initiating a navigation session. Another application is in social network analysis, where the potential gain could provide a novel measure of centrality.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 08:59:35 GMT" } ]
2007-11-27T00:00:00
[ [ "Fenner", "Trevor", "" ], [ "Levene", "Mark", "" ], [ "Loizou", "George", "" ] ]
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711.3967
Aleksandra Keli\'c
Karl-Heinz Schmidt, Aleksandra Kelic, Maria Valentina Ricciardi
Experimental evidence for the separability of compound-nucleus and fragment properties in fission
11 pages, 3 figures
Europhys.Lett.83:32001,2008
10.1209/0295-5075/83/32001
null
nucl-ex
null
The large body of experimental data on nuclear fission is analyzed with a semi-empirical ordering scheme based on the macro-microscopic approach and the separability of compound-nucleus and fragment properties on the fission path. We apply the statistical model to the non-equilibrium descent from saddle to scission, taking the influence of dynamics into account by an early freeze out. The present approach reveals a large portion of common features behind the variety of the complex observations made for the different systems. General implications for out-of-equilibrium processes are mentioned.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 09:00:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Schmidt", "Karl-Heinz", "" ], [ "Kelic", "Aleksandra", "" ], [ "Ricciardi", "Maria Valentina", "" ] ]
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711.3968
John Guaschi
Daciberg Lima Gon\c{c}alves (IME), John Guaschi (LMNO)
The classification and the conjugacy classes of the finite subgroups of the sphere braid groups
23 pages
Algebraic and Geometric Topology 8, 2 (2008) 757?785
10.2140/agt.2008.8.757
null
math.GT math.GR
null
Let n\geq 3. We classify the finite groups which are realised as subgroups of the sphere braid group B_n(S^2). Such groups must be of cohomological period 2 or 4. Depending on the value of n, we show that the following are the maximal finite subgroups of B_n(S^2): Z_{2(n-1)}; the dicyclic groups of order 4n and 4(n-2); the binary tetrahedral group T_1; the binary octahedral group O_1; and the binary icosahedral group I. We give geometric as well as some explicit algebraic constructions of these groups in B_n(S^2), and determine the number of conjugacy classes of such finite subgroups. We also reprove Murasugi's classification of the torsion elements of B_n(S^2), and explain how the finite subgroups of B_n(S^2) are related to this classification, as well as to the lower central and derived series of B_n(S^2).
[ { "version": "v1", "created": "Mon, 26 Nov 2007 09:03:03 GMT" } ]
2009-04-24T00:00:00
[ [ "Gonçalves", "Daciberg Lima", "", "IME" ], [ "Guaschi", "John", "", "LMNO" ] ]
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711.3969
Keiichi Yamamoto
Keiichi Yamamoto, Yoshiyuki Shibayama, Keiya Shirahama
Thermodynamic Evidence for Nanoscale Bose-Einstein Condensation in ^4He Confined in Nanoporous Media
4 pages, 4 figures, submitted to Phys. Rev. Lett
null
10.1103/PhysRevLett.100.195301
null
cond-mat.mes-hall
null
We report the measurements of the heat capacity of ^4He confined in nanoporous Gelsil glass that has nanopores of 2.5-nm diameter at pressures up to 5.3 MPa. The heat capacity has a broad peak at a temperature much higher than the superfluid transition temperature obtained using the torsional oscillator technique. The peak provides a definite thermodynamic evidence for the formation of localized Bose-Einstein condensates (LBECs) on nanometer length scales. The temperature dependence of heat capacity is well described by the excitations of phonons and rotons, supporting the existence of LBEC.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:10:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Yamamoto", "Keiichi", "" ], [ "Shibayama", "Yoshiyuki", "" ], [ "Shirahama", "Keiya", "" ] ]
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711.397
Alok Kumar
Alok Kumar
Chiral Symmetry Breaking in Gribov's Approach to QCD at Low Momentum
8 pages, 1 figure
null
null
null
hep-th
null
We consider Gribov's equation for inverse quark Green function with and without pion correction. With polar parametrization of inverse quark Green function, we relate the dynamical mass function without pion correction, $M_{0}(q^2)$ and with pion correction, $M(q^2)$ at low momentum. A graph is plotted for $M(q^2)$ and $M_{0}(q^2)$ with q for low momentum. It is found that at low momenta pion corrections are small.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 09:26:38 GMT" } ]
2007-11-27T00:00:00
[ [ "Kumar", "Alok", "" ] ]
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711.3971
Vladimir I. Korobov
V.I. Korobov
Relativistic corrections of m\alpha^6 order to the ro-vibrational spectrum of H_2^+ and HD^+ molecular ions
4 pages, 1 figure
Phys. Rev. A 77, 022509 (2008)
10.1103/PhysRevA.77.022509
null
physics.atom-ph
null
The major goal of the high-precision studies of ro-vibrational states in the hydrogen molecular ions is to provide an alternative way for improving the electron-to-proton mass ratio, or the atomic mass of electron. By now the complete set of relativistic and radiative corrections have been obtained for a wide range of ro-vibrational states of H_2^+ and HD^+ up to order R_\infty\alpha^4. In this work we complete calculations of various contributions to the R_\infty\alpha^4 order by computing the relativistic corrections to the binding energy of electron.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 09:28:29 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 11:05:48 GMT" } ]
2008-04-16T00:00:00
[ [ "Korobov", "V. I.", "" ] ]
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711.3972
Pedro Lind
Pedro G. Lind
The network approach: basic concepts and algorithms
18 pages, 7 figures; to appear in "Lectures on Socio- and Econophysics", Ed. J.Schneider and C.Hirtreiter, Springer
null
null
null
physics.soc-ph physics.comp-ph
null
What is a complex network? How do we characterize complex networks? Which systems can be studied from a network approach? In this text, we motivate the use of complex networks to study and understand a broad panoply of systems, ranging from physics and biology to economy and sociology. Using basic tools from statistical physics, we will characterize the main types of networks found in nature. Moreover, the most recent trends in network research will be briefly discussed.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 09:47:21 GMT" } ]
2007-11-27T00:00:00
[ [ "Lind", "Pedro G.", "" ] ]
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711.3973
Alexander Goritschnig T.
A.T. Goritschnig, B. Melic, K. Passek-Kumericki, W. Schweiger
Hard Exclusive Photoproduction of Phi and J/Psi Mesons
2 pages, 2 figures, Talk presented at "International School of Nuclear Physics: Quarks in Hadrons and Nuclei", Erice, 16.-24. Sept. 2007 (Italy)
Prog.Part.Nucl.Phys.61:173-174,2008
10.1016/j.ppnp.2007.12.013
null
hep-ph
null
We calculate the leading-order perturbative contribution to $\gamma p \to M_{V} p$, with $M_V$ being a $\Phi$ or $J/\Psi$ meson, in the kinematic region of large energy and scattering angle.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:03:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Goritschnig", "A. T.", "" ], [ "Melic", "B.", "" ], [ "Passek-Kumericki", "K.", "" ], [ "Schweiger", "W.", "" ] ]
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711.3974
Alexander Chernyatiev
A.Ya. Belov, A.L. Chernyat'ev
Remark to the paper Describing the set of words generated by interval exchange transformation, posted 15 November 2007
This is comment to our previous paper: Describing the set of words generated by interval exchange transformation. arXiv:0711.2374v1
null
null
null
math.DS math.RA
null
Let us call subdivision {\it good}, if 1) set corresponding to each symbol is convex (i.e. interval or (semi)closed interval). 2) If points $A$ and $B$ corresponds to the some color and interval $(A,B)$ has discontinuity point, then $f(A)$ and $f(B)$ has different color. Every subdivision can be further divided into good subdivision, old superword can be obtained from new one by gluing letters. Hence in the section ``Equivalence of the set of uniformly recurrent words generated by piecewise-continuous transformation to the set of words generated by interval exchange transformation'' one can consider only good subdivision.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:09:55 GMT" } ]
2007-11-27T00:00:00
[ [ "Belov", "A. Ya.", "" ], [ "Chernyat'ev", "A. L.", "" ] ]
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711.3975
Pablo Arrighi
Pablo Arrighi, Vincent Nesme, Reinhard Werner
Unitarity plus causality implies localizability
V1: 5 pages, revtex. V2: Generalizes V1. V3: More precisions and references
QIP 2010
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a graph with a single quantum system at each node. The entire compound system evolves in discrete time steps by iterating a global evolution $U$. We require that this global evolution $U$ be unitary, in accordance with quantum theory, and that this global evolution $U$ be causal, in accordance with special relativity. By causal we mean that information can only ever be transmitted at a bounded speed, the speed bound being quite naturally that of one edge of the underlying graph per iteration of $U$. We show that under these conditions the operator $U$ can be implemented locally; i.e. it can be put into the form of a quantum circuit made up with more elementary operators -- each acting solely upon neighbouring nodes. We take quantum cellular automata as an example application of this representation theorem: this analysis bridges the gap between the axiomatic and the constructive approaches to defining QCA. KEYWORDS: Quantum cellular automata, Unitary causal operators, Quantum walks, Quantum computation, Axiomatic quantum field theory, Algebraic quantum field theory, Discrete space-time.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:18:50 GMT" }, { "version": "v2", "created": "Thu, 11 Dec 2008 14:57:50 GMT" }, { "version": "v3", "created": "Fri, 23 Oct 2009 20:37:14 GMT" } ]
2017-08-29T00:00:00
[ [ "Arrighi", "Pablo", "" ], [ "Nesme", "Vincent", "" ], [ "Werner", "Reinhard", "" ] ]
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711.3976
Asmus Boehm
Asmus Boehm and Bodo L. Ziegler
The (Anti-)Hierarchical Evolution of Disk Galaxies
Comments: 2 pages, 2 figures, proceedings from the conference "Formation and Evolution of Galaxy Disks", Rome, Oct 1-5, 2007. To be published in the ASP Conference Series
null
null
null
astro-ph
null
Utilizing spatially resolved VLT/FORS spectroscopy and HST/ACS imaging, we constructed a sample of over 200 field spiral galaxies at redshifts 0.1<z<1.0. We find that the ratio between stellar and total mass remains roughly constant over the observed epochs, in compliance with the framework of hierarchical structure growth. However, the stellar mass-to-light ratios evolve more strongly in low-mass spirals than in high--mass spirals, indicating an anti-hierarchical evolution of their stellar populations (aka "down-sizing").
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:22:29 GMT" } ]
2007-11-27T00:00:00
[ [ "Boehm", "Asmus", "" ], [ "Ziegler", "Bodo L.", "" ] ]
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711.3977
Milos V. Lokajicek
Milos V. Lokajicek
Hidden-variable theory versus Copenhagen quantum mechanics
10 pages, 2 figures; v2: local refinements and improvements of the text
null
10.1063/1.2947705
null
quant-ph
null
The main assumptions the Copenhagen quantum mechanics has been based on will be summarized and the known (not yet decided) contradiction between Einstein and Bohr will be newly analyzed. The given assumptions have been represented basically by time-dependent Schroedinger equation, to which some further assumptions have been added. Some critical comments have been raised against the given mathematical model structure by Pauli (1933) and by Susskind and Glogover (1964). They may be removed if only the Schroedinger equation is conserved and the additional assumptions are abandoned, as shown recently. It seems to be in contradiction to the numerous declarations that the Copenhagen model has been approved by experimental results. However, in the most of these experiments only the agreement with the mere Schroedinger equation has been tested. All mentioned assumptions have been tested practically only in the EPR experiment (measurement of coincidence light transmission through two polarizers) proposed originally by Einstein (1935). Also these experimental results have been interpreted as supporting the Copenhagen alternative, which has not been, however, true. In fact the microscopic world may be described correspondingly only with the help of the hidden-variable theory that is represented by the Schroedinger equation without mentioned additional assumptions, which has the consequence that the earlier interpretation gap between microscopic and macroscopic worlds has been removed. The only difference concerns the existence of discrete states. The possibilities of the human reason of getting to know the nature will be also shortly discussed in the beginning of this contribution.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:39:26 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 10:51:03 GMT" }, { "version": "v3", "created": "Tue, 29 Jan 2008 12:10:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Lokajicek", "Milos V.", "" ] ]
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711.3978
Andrzej Udalski
A. Udalski, F. Pont, D. Naef, C. Melo, F. Bouchy, N.C. Santos, C. Moutou, R.F. Diaz, W. Gieren, M. Gillon, S. Hoyer, M. Mayor, T. Mazeh, D. Minniti, G. Pietrzynski, D. Queloz, S. Ramirez, M.T. Ruiz, O. Tamuz, S. Udry, M. Zoccali, M. Kubiak, M.K. Szymanski, I. Soszynski, O. Szewczyk, K. Ulaczyk, L. Wyrzykowski
OGLE-TR-211 - a new transiting inflated hot Jupiter from the OGLE survey and ESO LP666 spectroscopic follow-up program
6 pages. Submitted to Astronomy and Astrophysics
null
10.1051/0004-6361:20079143
null
astro-ph
null
We present results of the photometric campaign for planetary and low-luminosity object transits conducted by the OGLE survey in 2005 season (Campaign #5). About twenty most promising candidates discovered in these data were subsequently verified spectroscopically with the VLT/FLAMES spectrograph. One of the candidates, OGLE-TR-211, reveals clear changes of radial velocity with small amplitude of 82 m/sec, varying in phase with photometric transit ephemeris. Thus, we confirm the planetary nature of the OGLE-TR-211 system. Follow-up precise photometry of OGLE-TR-211 with VLT/FORS together with radial velocity spectroscopy supplemented with high resolution, high S/N VLT/UVES spectra allowed us to derive parameters of the planet and host star. OGLE-TR-211b is a hot Jupiter orbiting a F7-8 spectral type dwarf star with the period of 3.68 days. The mass of the planet is equal to 1.03+/-0.20 M_Jup while its radius 1.36+0.18-0.09 R_Jup. The radius is about 20% larger than the typical radius of hot Jupiters of similar mass. OGLE-TR-211b is, then, another example of inflated hot Jupiters - a small group of seven exoplanets with large radii and unusually small densities - objects being a challenge to the current models of exoplanets.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 17:37:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Udalski", "A.", "" ], [ "Pont", "F.", "" ], [ "Naef", "D.", "" ], [ "Melo", "C.", "" ], [ "Bouchy", "F.", "" ], [ "Santos", "N. C.", "" ], [ "Moutou", "C.", "" ], [ "Diaz", "R. F.", "" ], [ "Gieren", "W.", "" ], [ "Gillon", "M.", "" ], [ "Hoyer", "S.", "" ], [ "Mayor", "M.", "" ], [ "Mazeh", "T.", "" ], [ "Minniti", "D.", "" ], [ "Pietrzynski", "G.", "" ], [ "Queloz", "D.", "" ], [ "Ramirez", "S.", "" ], [ "Ruiz", "M. T.", "" ], [ "Tamuz", "O.", "" ], [ "Udry", "S.", "" ], [ "Zoccali", "M.", "" ], [ "Kubiak", "M.", "" ], [ "Szymanski", "M. K.", "" ], [ "Soszynski", "I.", "" ], [ "Szewczyk", "O.", "" ], [ "Ulaczyk", "K.", "" ], [ "Wyrzykowski", "L.", "" ] ]
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711.3979
John Jeffers
Craig S. Hamilton and John Jeffers
Fidelity for imperfect postselection
8 Pages, 8 Figures
Phys. Rev. A 76, 052106 (2007)
10.1103/PhysRevA.76.052106
null
quant-ph
null
We describe a simple measure of fidelity for mixed state postselecting devices. The measure is most appropriate for postselection where the task performed by the output is only effected by a specific state.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 11:01:53 GMT" } ]
2007-11-27T00:00:00
[ [ "Hamilton", "Craig S.", "" ], [ "Jeffers", "John", "" ] ]
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711.398
Petr Zasche
P. Zasche, M. Wolf
Combining astrometry with the light-time effect: The case of VW Cep, zeta Phe and HT Vir
10 pages, 8 figures, 3 tables, submitted to AN
Astron.Nachr.328:928-937,2007
10.1002/asna.200710828
null
astro-ph
null
Three eclipsing binary systems with astrometric orbit have been studied. For a detailed analysis two circular-orbit binaries (VW Cep and HT Vir) and one binary with an eccentric orbit (zeta Phe) have been chosen. Merging together astrometry and the analysis of the times of minima, one is able to describe the orbit of such a system completely. The O-C diagrams and the astrometric orbits of the third bodies were analysed simultaneously for these three systems by the least-squares method. The introduced algorithm is useful and powerful, but also time consuming, due to many parameters which one is trying to derive. The new orbits for the third bodies in these systems were found with periods 30, 221, and 261 yr, and eccentricities 0.63, 0.37, and 0.64 for VW Cep, zeta Phe, and HT Vir, respectively. Also an independent approach to compute the distances to these systems was used. The use of this algorithm to VW Cep gave the distance d=(27.90 +/- 0.29) pc, which is in excellent agreement with the previous Hipparcos result.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 10:58:49 GMT" } ]
2009-06-23T00:00:00
[ [ "Zasche", "P.", "" ], [ "Wolf", "M.", "" ] ]
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711.3981
Tatiana Shubina
T.V. Shubina, M.M. Glazov, A.A. Toropov, N.A. Gippius, A. Vasson, J. Leymarie, A. Kavokin, A. Usui, J.P. Bergman, G. Pozina, B. Monemar
Resonant light delay in GaN with ballistic and diffusive propagation
4 pages, 4 figures
null
10.1103/PhysRevLett.100.087402
null
cond-mat.mtrl-sci
null
We report on a strong delay in light propagation through bulk GaN, detected by time-of-flight spectroscopy. The delay increases resonantly as the photon energy approaches the energy of a neutral-donor bound exciton (BX), resulting in a velocity of light as low as 2100 km/s. In the close vicinity of the BX resonance, the transmitted light contains both ballistic and diffusive components. This phenomenon is quantitatively explained in terms of optical dispersion in a medium where resonant light scattering by the BX resonance takes place in addition to the polariton propagation.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 11:08:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Shubina", "T. V.", "" ], [ "Glazov", "M. M.", "" ], [ "Toropov", "A. A.", "" ], [ "Gippius", "N. A.", "" ], [ "Vasson", "A.", "" ], [ "Leymarie", "J.", "" ], [ "Kavokin", "A.", "" ], [ "Usui", "A.", "" ], [ "Bergman", "J. P.", "" ], [ "Pozina", "G.", "" ], [ "Monemar", "B.", "" ] ]
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711.3982
Dror Orgad
Dror Orgad and Oded Agam
Correlated tunneling and the instability of the fractional quantum Hall edge
Published version
Phys. Rev. Lett. 100, 156802 (2008)
10.1103/PhysRevLett.100.156802
null
cond-mat.mes-hall
null
We consider a class of interaction terms that describes correlated tunneling of composite fermions between effective Landau levels. Despite being generic and of similar strength to that of the usual density-density couplings, these terms are not included in the accepted theory of the edges of fractional quantum Hall systems. Here we show that they may lead to an instability of the edge towards a new reconstructed state with additional channels, and thereby demonstrate the incompleteness of the traditional edge theory.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:37:57 GMT" }, { "version": "v2", "created": "Sat, 17 May 2008 21:19:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Orgad", "Dror", "" ], [ "Agam", "Oded", "" ] ]
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711.3983
Ted Hurley
Ted Hurley
Self-dual, dual-containing and related quantum codes from group rings
null
null
null
null
cs.IT math.IT math.RA
null
Classes of self-dual codes and dual-containing codes are constructed. The codes are obtained within group rings and, using an isomorphism between group rings and matrices, equivalent codes are obtained in matrix form. Distances and other properties are derived by working within the group ring. Quantum codes are constructed from the dual-containing codes.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 11:36:56 GMT" } ]
2007-11-27T00:00:00
[ [ "Hurley", "Ted", "" ] ]
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711.3984
Hong-Jian Feng
Hong-Jian Feng
Coupling of magnetization and structural distortions in multiferroic BiFeO3 : an ab initio density functional theory study
This paper has been withdraw
null
10.1088/0256-307X/25/2/086
null
cond-mat.mtrl-sci cond-mat.str-el
null
This paper has been withdrawn by the author due to a crucial citing error in equation 4.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:04:36 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 17:17:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Feng", "Hong-Jian", "" ] ]
[ 0.037337821, 0.0076146452, 0.0223169904, 0.0615193844, -0.0644378513, 0.055172883, -0.0340024307, 0.0116622783, -0.0955218151, -0.0724057257, 0.1638046354, -0.0417386815, -0.0256639607, -0.0036278139, 0.0837553069, 0.0458847545, -0.1084927693, -0.0839406103, -0.0165379681, -0.0146502303, -0.0649937466, -0.1285050958, 0.0788448751, -0.0490580052, -0.0869980454, -0.0528566428, 0.0541537367, -0.0409511589, 0.100246951, 0.082365565, 0.0882951394, -0.0348594412, -0.0427578278, -0.0316630267, -0.1615810394, 0.1280418485, -0.0137237338, 0.0536904894, -0.0210893825, -0.0104230884, 0.0422482528, -0.0867664218, -0.0790301785, 0.0686534122, 0.0599443428, 0.0668467432, 0.0384727791, 0.0381716676, 0.0699041784, 0.0258492604, -0.0097861225, -0.0717108473, 0.01005249, -0.0464638136, 0.0535051897, 0.0760653839, 0.0161673687, 0.0604539141, 0.0303890947, -0.0096297758, -0.0318714902, -0.0232782308, 0.0084600737, 0.0263125077, -0.1041382402, 0.0869517252, -0.0529956147, 0.0174644645, 0.0463943258, 0.0580913462, -0.03207995, -0.0553118587, 0.0346278176, 0.0471818484, 0.0346046537, -0.0436379984, 0.0064623151, 0.0738881156, -0.0333075598, -0.03082918, 0.0400478244, 0.0196069889, 0.0210198965, -0.0251543876, 0.0194332693, -0.0229192134, -0.0113785388, 0.0421787649, -0.0508646742, -0.1177577376, 0.0408121832, -0.0543853603, -0.0446339808, 0.0334465355, -0.0344193541, -0.0709233284, 0.0210430585, -0.0490116812, 0.0241352413, -0.0245753266, -0.0291614868, 0.0607781895, 0.0418776534, 0.0723130703, 0.0359480754, 0.0034164567, -0.0164800622, -0.1197033823, -0.0986719057, 0.0293236226, 0.0993204564, 0.013052023, -0.0519764684, -0.055219207, -0.0365502983, -0.1322110891, -0.0564699769, -0.0398625247, -0.0833383873, 0.0460237265, -0.0548486076, 0.0789838508, 0.126930058, 0.0233245566, 0.0953365192, -0.0389128663, 0.0277949031, 0.0374767929, -0.0592031442, -0.0857935995, -0.0330527723, -0.0057066409, -0.0405342355, -0.0404184237, -0.0286750756, -0.045629967, 0.0887583941, 0.0257566106, 0.0511426218, 0.0169317294, -0.0201513041, -0.0357627757, 0.1125693619, 0.0014049455, 0.0253860112, 0.0523007438, 0.1111796126, -0.0318020023, 0.1098825186, 0.0019760439, -0.0166537799, -0.0241584033, 0.1042308882, -0.0128667243, 0.0920474529, -0.0762970075, 0.0626775101, 0.032682173, 0.1106237173, 0.0286055878, 0.0773624778, -0.0270305444, -0.0418313295, -0.072961621, 0.1319331378, 0.0330296084, -0.1391598135, 0.0125308689, -0.0417618416, -0.073980771, 0.0146965552, 0.0138279647, -0.1638972759, -0.0165379681, -0.0561920293, 0.1072883233, 0.040233124, -0.1906730384, -0.0026448588, 0.0423872285, 0.0437074862, 0.0286055878, 0.0573038273, 0.1111796126, -0.0164105743, 0.0032166811, -0.0145228365, 0.0903334394, 0.0896848887, 0.0458384268, -0.0461163782, 0.1053426862, -0.0096355667, -0.0102667427, -0.1394377649, -0.0293931104, 0.0670783669, -0.0060048574, -0.0120444577, 0.008871207, -0.0306670442, 0.0500308275, 0.028466614, -0.0249227639, -0.0700894818, 0.0348131172, 0.0151366415, -0.0484557822, -0.0066881487, 0.0504014231, 0.0381485038, 0.0155419838, 0.0728226453, 0.081439063, 0.0600369908, -0.0405110717, -0.0730079487, 0.0027708043, 0.0075451583, 0.0680975094, 0.0059643229, -0.0432673991, 0.0011950361, 0.137862727, -0.0205682293, 0.0235330183, -0.0469270609, -0.0450972319, 0.0034946301, 0.0407658592, 0.0182519872, -0.0508183464, 0.1285977513, 0.0402562842, -0.0413217545, -0.0835236832, -0.0210314766, 0.0064912681, -0.0577670746, 0.0005370786, -0.1512042731, 0.0300648212, 0.0149860857, 0.0359249115, -0.1384186149, 0.0631870776, -0.0393761136, 0.0293004606, 0.0604075901, -0.0077883634, 0.0968189165, 0.1349905729, -0.0079331286, 0.0308755059, -0.0143606998, 0.0123687321 ]
711.3985
Martin Durant
Martin Durant and Marten H. van Kerkwijk
A search for the optical counterpart to the magnetar CXOU J010043.1-721134
9 pages, accepted by ApJ
null
10.1086/529017
null
astro-ph
null
After our tentative detection of an optical counterpart to CXOU J010043.1-721134 from archival Hubble Space Telescope (HST) imaging, we have followed up with further images in four bands. Unfortunately, the source originally identified is not confirmed. We provide deep photometric limits in four bands and accurate photometry of field stars around the location of the magnetar.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:07:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Durant", "Martin", "" ], [ "van Kerkwijk", "Marten H.", "" ] ]
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711.3986
Dan Radu Grigore
D. R. Grigore
Cohomological Aspects of Gauge Invariance in the Causal Approach
57 pages, no figures
Rom.J.Phys.55:386-438,2010
null
null
hep-th
null
Quantum theory of the gauge models in the causal approach leads to some cohomology problems. We investigate these problems in detail.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:31:35 GMT" } ]
2011-03-17T00:00:00
[ [ "Grigore", "D. R.", "" ] ]
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711.3987
R\"udiger Paschotta
R\"udiger Paschotta
Power scalability as a precise concept for the evaluation of laser architectures
9 pages, 3 figures
null
null
null
physics.optics
null
This paper establishes power scaling of lasers as a clearly defined concept, based on a power scaling procedure which must satisfy various criteria. It is demonstrated that this concept creates useful insight particularly for the evaluation of the future performance potential of different laser architectures, and for identifying technological aspects which will need to be modified for generating higher powers. It turns out that some aspects (such as e.g. thermal lensing in thin disk lasers) can have rather benign scaling properties, not causing problems even at very high power levels, while other aspects can become essential even if they initially may have appeared to be insignificant.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 16:52:24 GMT" } ]
2007-11-27T00:00:00
[ [ "Paschotta", "Rüdiger", "" ] ]
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711.3988
Bertrand Lemasle
B. Lemasle, A. Piersimoni, S. Pedicelli, G. Bono, P. Francois, F. Primas, M. Romaniello
Cepheids as tracers of the metallicity gradient across the Galactic disk
5 pages, 2 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proceeding Cefalu' Workshop "XXI Century Challenges for Stellar Evolution", ed. S. Cassisi & M. Salaris)
null
null
null
astro-ph
null
We present iron abundance measurements, based on high resolution spectroscopy, and accurate distance determinations, based on near infrared photometry, for 34 Galactic Cepheids. The new data are used to constrain the Galactic iron abundance gradient in the outer disk, namely from 10 to 14 kpc. We confirm the flattening of the gradient toward the outer disk. In this region we also found an increase in the metallicity dispersion. Current data do not support the occurrence of a jump in the metallicity gradient for Galactocentric distances of the order of 10-12 kpc.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 16:03:48 GMT" } ]
2007-11-27T00:00:00
[ [ "Lemasle", "B.", "" ], [ "Piersimoni", "A.", "" ], [ "Pedicelli", "S.", "" ], [ "Bono", "G.", "" ], [ "Francois", "P.", "" ], [ "Primas", "F.", "" ], [ "Romaniello", "M.", "" ] ]
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711.3989
R. Rosenfelder
R. Rosenfelder (PSI)
Perturbative Results Without Diagrams
6 pages, 2 figures, WS style (included), to be published in Proceedings of "Path Integrals - New Trends and Perspectives", Dresden (Germany), Sept. 23 - 28, 2007
null
10.1142/9789812837271_0042
PSI-PR-07-10
hep-th cond-mat.stat-mech quant-ph
null
Higher-order perturbative calculations in Quantum (Field) Theory suffer from the factorial increase of the number of individual diagrams. Here I describe an approach which evaluates the total contribution numerically for finite temperature from the cumulant expansion of the corresponding observable followed by an extrapolation to zero temperature. This method (originally proposed by Bogolyubov and Plechko) is applied to the calculation of higher-order terms for the ground-state energy of the polaron. Using state-of-the-art multidimensional integration routines 2 new coefficients are obtained corresponding to a 4- and 5-loop calculation.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:27:06 GMT" } ]
2017-08-23T00:00:00
[ [ "Rosenfelder", "R.", "", "PSI" ] ]
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711.399
Jean-Marie Vigoureux
J.-M. Vigoureux, P. Vigoureux, B. Vigoureux
Cosmological applications of a geometrical interpretation of "c"
2 figures
Int.J.Theor.Phys.47:928-935,2008
10.1007/s10773-007-9518-8
null
astro-ph
null
We make the hypothesis that the velocity of light and the expansion of the universe are two aspects of one single concept connecting space and time in the expanding universe. We show that solving Friedman's equations with that interpretation (keeping c = constant) could explain number of unnatural features of the standard cosmology. We thus examine in that light the flatness and the quintessence problems, the problem of the observed uniformity in term of temperature and density of the cosmological background radiation and the small-scale inhomogeneity problem. We finally show that using this interpretation of c leads to reconsider the Hubble diagram of distance moduli and redshifts as obtained from recent observations of type Ia supernovae without having to need an accelerating universe.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:29:02 GMT" } ]
2009-06-23T00:00:00
[ [ "Vigoureux", "J. -M.", "" ], [ "Vigoureux", "P.", "" ], [ "Vigoureux", "B.", "" ] ]
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711.3991
Juraj Bracinik
Juraj Bracinik (for the H1 and ZEUS collaborations)
Physics with ep collisions at highest Q2 and Pt at the HERA collider
talk given at Hadron Structure 07, Modra-Harmonia, September 07
null
null
null
hep-ex
null
The HERA collider with its center of mass energy of 318 GeV makes it possible to study a wide range of electroweak physics as well as to search for physics beyond the Standard Model (SM). In this article, recent results, obtained by the two collider experiments H1 and ZEUS, are reviewed. The cross sections for inclusive neutral current and charged current processes are shown, and results from a combined electroweak and QCD analysis of the data are discussed. Selected results from searches for physics beyond the SM are presented.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:32:05 GMT" } ]
2007-11-27T00:00:00
[ [ "Bracinik", "Juraj", "", "for the H1 and ZEUS collaborations" ] ]
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711.3992
Eduardo Passos
E. Passos, K. E. L. de farias, M. A. Anacleto, E. Maciel, C. A. G. Almeida
Radiatively induced finite and (un)determined Chern-Simons-like terms
09 pages
null
10.23880/psbj-16000253 10.23880/psbj-16000253
Biophys. J., 7, (2023)
hep-th
http://creativecommons.org/licenses/by/4.0/
The problem of Chern-Simons-like term induction via quantum corrections in four-dimensions is investigated in two different cases. In the first case, we consider two distinct approaches to deal with the exact fermion propagator of the extended QED theory up to the first order in the $b$-coefficient. We find different results for distinct approaches in the same regularization scheme. In the second case, we show that when we use a modified derivative expansion method and another regularization scheme, we obtain a result that exactly coincides with one of the results obtained in the former case. This seems to imply an ambiguity absence as one treats the fermion propagator and the self-energy tensor properly.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 12:44:07 GMT" }, { "version": "v2", "created": "Fri, 1 Mar 2024 13:59:41 GMT" } ]
2024-03-04T00:00:00
[ [ "Passos", "E.", "" ], [ "de farias", "K. E. L.", "" ], [ "Anacleto", "M. A.", "" ], [ "Maciel", "E.", "" ], [ "Almeida", "C. A. G.", "" ] ]
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711.3993
Christiane Helling
Ch.Helling, A.Ackerman, F.Allard, M.Dehn, P.Hauschildt, D.Homeier, K.Lodders, M.Marley, F.Rietmeijer, T.Tsuji, P.Woitke
Comparison of cloud models for Brown Dwarfs
5 pages, Proceeding to "Exoplantes: Detection, Formation, Dynamics", eds. Ferraz-Mello et a
null
10.1017/S1743921308016578
null
astro-ph
null
A test case comparison is presented for different dust cloud model approaches applied in brown dwarfs and giant gas planets. We aim to achieve more transparency in evaluating the uncertainty inherent to theoretical modelling. We show in how far model results for characteristic dust quantities vary due to different assumptions. We also demonstrate differences in the spectral energy distributions resulting from our individual cloud modelling in 1D substellar atmosphere simulations
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:02:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Helling", "Ch.", "" ], [ "Ackerman", "A.", "" ], [ "Allard", "F.", "" ], [ "Dehn", "M.", "" ], [ "Hauschildt", "P.", "" ], [ "Homeier", "D.", "" ], [ "Lodders", "K.", "" ], [ "Marley", "M.", "" ], [ "Rietmeijer", "F.", "" ], [ "Tsuji", "T.", "" ], [ "Woitke", "P.", "" ] ]
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711.3994
Oksana Streltsova
Evgeny E. Donets, Edik A. Hayryan, Oksana I. Streltsova
Blowup/scattering alternative for a discrete family of static critical solutions with various number of unstable eigenmodes
29 pages, 10 figures
null
null
null
gr-qc hep-th math-ph math.AP math.MP
null
Decay of regular static spherically symmetric solutions in the SU(2) Yang-Mills-dilaton (YMd) system of equations under the independent excitation of their unstable eigenmodes has been studied self-consistently in the nonlinear regime. The considered regular YMd solutions form a discrete family and can be parametrised by the number $N=1,2,3,4...$ of their unstable eigenmodes in linear approximation. We have obtained strong numerical evidences in favour of the following statements: i) all static YMd solutions are distinct local threshold configurations, separating blowup and scattering solutions; ii) the main unstable eigenmodes are only those responsible for the blowup/scattering alternative; iii) excitation of higher unstable eigenmodes always leads to finite-time blowup; iv) the decay of the lowest N=1 static YMd solution via excitation of its unique unstable mode is an exceptional case because the resulting waves propagate as a whole without energy dispersion revealing features peculiar to solitons. Applications of the obtained results to Type-I gravitational collapse of massless fields are briefly discussed.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:05:45 GMT" } ]
2007-11-28T00:00:00
[ [ "Donets", "Evgeny E.", "" ], [ "Hayryan", "Edik A.", "" ], [ "Streltsova", "Oksana I.", "" ] ]
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711.3995
Niels Leth Gammelgaard
J{\o}rgen Ellegaard Andersen, Niels Leth Gammelgaard, Magnus Roed Lauridsen
Hitchin's Connection in Half-Form Quantization
29 pages
Quantum Topol. 3 (2012), no. 3-4, 327-357
null
null
math.DG math-ph math.MP
null
We give a differential geometric construction of a connection in the bundle of quantum Hilbert spaces arising from half-form corrected geometric quantization of a prequantizable, symplectic manifold, endowed with a rigid, family of K\"ahler structures, all of which give vanishing first Dolbeault cohomology groups. In [And1] Andersen gave an explicit construction of Hitchin's connection in the non-corrected case using additional assumptions. Under the same assumptions we also give an explicit solution in terms of Ricci potentials. Morover we show that if these are carefully chosen the construction coincides with the construction of Andersen in the non-corrected case.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 15:15:26 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 14:09:01 GMT" }, { "version": "v3", "created": "Mon, 17 Mar 2008 10:02:59 GMT" }, { "version": "v4", "created": "Tue, 20 May 2008 14:01:20 GMT" } ]
2014-08-21T00:00:00
[ [ "Andersen", "Jørgen Ellegaard", "" ], [ "Gammelgaard", "Niels Leth", "" ], [ "Lauridsen", "Magnus Roed", "" ] ]
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711.3996
Eligio Lisi
Amand Faessler, Gianluigi Fogli, Eligio Lisi, Vadim Rodin, Anna Maria Rotunno, Fedor Simkovic (Tubingen U. and Bari U. and INFN, Bari)
Overconstrained estimates of neutrinoless double beta decay within the QRPA
Revised version (27 pages, including 10 figures), focussed on Mo-100 and Cd-116. To appear in J. Phys. G: Nucl. Phys. (2008)
J.Phys.G35:075104,2008
10.1088/0954-3899/35/7/075104
null
nucl-th hep-ex hep-ph nucl-ex
null
Estimates of nuclear matrix elements for neutrinoless double beta decay (0nu2beta) based on the quasiparticle random phase approximations (QRPA) are affected by theoretical uncertainties, which can be substantially reduced by fixing the unknown strength parameter g_pp of the residual particle-particle interaction through one experimental constraint - most notably through the two-neutrino double beta decay (2nu2beta) lifetime. However, it has been noted that the g_pp adjustment via 2\nu2\beta data may bring QRPA models in disagreement with independent data on electron capture (EC) and single beta decay (beta^-) lifetimes. Actually, in two nuclei of interest for 0nu2beta decay (Mo-100 and Cd-116), for which all such data are available, we show that the disagreement vanishes, provided that the axial vector coupling g_A is treated as a free parameter, with allowance for g_A<1 (``strong quenching''). Three independent lifetime data (2nu2beta, EC, \beta^-) are then accurately reproduced by means of two free parameters (g_pp, g_A), resulting in an overconstrained parameter space. In addition, the sign of the 2nu2beta matrix element M^2nu is unambiguously selected (M^2nu>0) by the combination of all data. We discuss quantitatively, in each of the two nuclei, these phenomenological constraints and their consequences for QRPA estimates of the 0nu2beta matrix elements and of their uncertainties.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:30:32 GMT" }, { "version": "v2", "created": "Thu, 29 May 2008 15:50:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Faessler", "Amand", "", "Tubingen U. and Bari U. and INFN, Bari" ], [ "Fogli", "Gianluigi", "", "Tubingen U. and Bari U. and INFN, Bari" ], [ "Lisi", "Eligio", "", "Tubingen U. and Bari U. and INFN, Bari" ], [ "Rodin", "Vadim", "", "Tubingen U. and Bari U. and INFN, Bari" ], [ "Rotunno", "Anna Maria", "", "Tubingen U. and Bari U. and INFN, Bari" ], [ "Simkovic", "Fedor", "", "Tubingen U. and Bari U. and INFN, Bari" ] ]
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711.3997
Christofer Cronstrom
Christofer Cronstrom and Tommi Raita
On the existence of Hamiltonians for non-holonomic systems
A printing error in Eq. (22) has been corrected, a few printing errors and obscure sentences have been removed. Dimensional parameters have been inserted in the example considered. The analysis of the non-uniqueness of the Lagrangian has been expanded and one related reference added
null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the question of existence of Hamiltonians for autonomous non-holonomic mechanical systems in this paper. The approach is elementary in the sense that the existence of a Hamiltonian for a given non-holonomic system is considered to be equivalent to the existence of a non-degenerate Lagrangian for the system in question. The possible existence of such a Lagrangian is related to the inverse problem of constructing a Lagrangian from the appropriate equations of motion. A simple example in three dimensions with one non-holonomic constraint is analysed in detail, and it is shown that in this case there is no Lagrangian reproducing the equations of motion in three dimensions. Thus the system does not admit a variational formulation in three dimensions. However, the system in question is equivalent to a two-dimensional system which admits a variational formulation. Two distinct Lagrangians and their corresponding Hamiltonians are constructed explicitly for this two-dimensional system
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:35:14 GMT" }, { "version": "v2", "created": "Mon, 20 Oct 2008 16:38:53 GMT" } ]
2008-10-20T00:00:00
[ [ "Cronstrom", "Christofer", "" ], [ "Raita", "Tommi", "" ] ]
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711.3998
Kenji Morita
Kenji Morita and Su Houng Lee
Critical behavior of charmonia across the phase transition: A QCD sum rule approach
18 pages, 21 figures, 2 figures are added and discussion on effect of dynamical quarks is extended. version to appear in Phys.Rev.C
Phys.Rev.C77:064904,2008
10.1103/PhysRevC.77.064904
null
hep-ph nucl-ex nucl-th
null
We investigate medium-induced change of mass and width of J/psi and eta_c across the phase transition in hot gluonic matter using QCD sum rules. In the QCD sum rule approach, the medium effect on heavy quarkonia is induced by the change of both scalar and twist-2 gluon condensates, whose temperature dependences are extracted from the lattice calculations of energy density and pressure. Although the stability of the operator product expansion side seems to break down at T > 1.06Tc for the vector channel and T>1.04Tc for the pseudoscalar channel, we find a sudden change of the spectral property across the critical temperature Tc, which originates from an equally rapid change of the scalar gluon condensate characterized by e-3p. By parameterizing the ground state of the spectral density by the Breit-Wigner form, we find that for both J/psi and eta_c, the masses suddenly decrease maximally by a few hundreds of MeV and the widths broaden to ~100 MeV slightly above Tc. Implications for recent and future heavy ion experiments are discussed. We also carry out a similar analysis for charmonia in nuclear matter, which could serve as a testing ground for observing the precursor phenomena of the QCD phase transition. We finally discuss the possibility of observing the mass shift at nuclear matter at the FAIR project at GSI.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:36:04 GMT" }, { "version": "v2", "created": "Wed, 14 May 2008 11:00:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Morita", "Kenji", "" ], [ "Lee", "Su Houng", "" ] ]
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711.3999
Thorsten Feldmann
F. De Fazio (INFN Bari), Th. Feldmann (Univ. Siegen), T. Hurth (CERN & SLAC)
SCET sum rules for B->P and B->V transition form factors
27 pages, 19 figures, minor corrections, matches journal version
JHEP 0802:031,2008
10.1088/1126-6708/2008/02/031
CERN-PH-TH/2007-167, SLAC-PUB-12823, SI-HEP-2007-14, BARI-TH/07-582
hep-ph
null
We investigate sum rules for heavy-to-light transition form factors at large recoil derived from correlation functions with interpolating currents for light pseudoscalar or vector fields in soft-collinear effective theory (SCET). We consider both, factorizable and non-factorizable contributions at leading power in the Lambda/m_b expansion and to first order in the strong coupling constant alpha_s, neglecting contributions from 3-particle distribution amplitudes in the B-meson. We pay particular attention to various sources of parametric and systematic uncertainties. We also discuss certain form factor ratios where part of the hadronic uncertainties related to the B-meson distribution amplitude and to logarithmically enhanced alpha_s corrections cancel.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:50:16 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 09:20:53 GMT" } ]
2009-02-18T00:00:00
[ [ "De Fazio", "F.", "", "INFN Bari" ], [ "Feldmann", "Th.", "", "Univ. Siegen" ], [ "Hurth", "T.", "", "CERN &\n SLAC" ] ]
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711.4
Leticia Cugliandolo
Leticia F. Cugliandolo and Jorge Kurchan
The out of equilibrium dynamics of the Sherrington-Kirkpatrick model
20 pages, 4 figures. Contribution to `Viewing the World through spin-glasses', international conference in honour of DS Sherrington
null
10.1088/1751-8113/41/32/324018
null
cond-mat.dis-nn cond-mat.stat-mech
null
The analytic solution to the dynamics of the Sherrington-Kirkpatrick model was developed in the nineties. It involves directly measurable out of equilibrium quantities, and thus addresses the questions relevant to an experimental system. We here review the out of equilibrium relaxation of this model and how it compares to experimental measurements.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:46:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Cugliandolo", "Leticia F.", "" ], [ "Kurchan", "Jorge", "" ] ]
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711.4001
M. Kilian
Fionntan Roukema
Goussarov-Polyak-Viro combinatorial formulas for finite type invariants
null
null
null
null
math.GT
null
Goussarov, Polyak, and Viro proved that finite type invariants of knots are ``finitely multi-local'', meaning that on a knot diagram, sums of quantities, defined by local information, determine the value of the knot invariant. The result implies the existence of Gauss diagram combinatorial formulas for finite type invariants. This article presents a simplified account of the original approach. The simplifications provide an easy generalization to the cases of pure tangles and pure braids. The associated problem on group algebras is introduced and used to prove the existence of ``multi-local word formulas'' for finite type invariants of pure braids.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:57:29 GMT" } ]
2007-11-27T00:00:00
[ [ "Roukema", "Fionntan", "" ] ]
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711.4002
Pierre Bieliavsky
Pierre Bieliavsky
Non-formal deformation quantizations of solvable Ricci-type symplectic symmetric spaces
null
null
10.1088/1742-6596/103/1/012001
null
math.QA math.SG
null
Ricci-type symplectic manifolds have been introduced and extensively studied by M. Cahen et al.. In this note, we describe their deformation quantizations in the split solvable symmetric case. In particular, we introduce the notion of non-formal tempered deformation quantization on such a space. We show that the set of tempered deformation quantizations is in one-to-one correspondence with the space of Schwartz operator multipliers on the real line. Moreover we prove that every invariant formal star product on a split Ricci-type solvable symmetric space is an asymptotic expansion of a tempered non-formal quantization. This note illustrates and partially reviews through an example a problematic studied by the author regarding non-formal quantization in presence of large groups of symmetries.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:58:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Bieliavsky", "Pierre", "" ] ]
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711.4003
Nicola Bartolo
N. Bartolo (Physics Dept. and INFN, Padova, Italy), A. Riotto (CERN, Switzerland and INFN Padova, Italy)
Possibly Large Corrections to the Inflationary Observables
4 pages, LateX file
Mod.Phys.Lett.A23:857-862,2008
10.1142/S0217732308026911
null
astro-ph gr-qc hep-ph hep-th
null
We point out that the theoretical predictions for the inflationary observables may be generically altered by the presence of fields which are heavier than the Hubble rate during inflation and whose dynamics is usually neglected. They introduce corrections which may be easily larger than both the second-order contributions in the slow-roll parameters and the accuracy expected in the forthcoming experiments.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:58:12 GMT" } ]
2009-06-23T00:00:00
[ [ "Bartolo", "N.", "", "Physics Dept. and INFN, Padova, Italy" ], [ "Riotto", "A.", "", "CERN,\n Switzerland and INFN Padova, Italy" ] ]
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711.4004
Rafa{\l} Kulik
Rafa{\l} Kulik
Nonparametric deconvolution problem for dependent sequences
Published in at http://dx.doi.org/10.1214/07-EJS154 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Electronic Journal of Statistics 2008, Vol. 2, 722-740
10.1214/07-EJS154
IMS-EJS-EJS_2007_154
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the nonparametric estimation of the density function of weakly and strongly dependent processes with noisy observations. We show that in the ordinary smooth case the optimal bandwidth choice can be influenced by long range dependence, as opposite to the standard case, when no noise is present. In particular, if the dependence is moderate the bandwidth, the rates of mean-square convergence and, additionally, central limit theorem are the same as in the i.i.d. case. If the dependence is strong enough, then the bandwidth choice is influenced by the strength of dependence, which is different when compared to the non-noisy case. Also, central limit theorem are influenced by the strength of dependence. On the other hand, if the density is supersmooth, then long range dependence has no effect at all on the optimal bandwidth choice.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 13:59:16 GMT" }, { "version": "v2", "created": "Wed, 13 Aug 2008 12:29:58 GMT" } ]
2008-08-13T00:00:00
[ [ "Kulik", "Rafał", "" ] ]
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711.4005
Atanas Stefanov
Milena Stanislavova, Atanas Stefanov
The Kuramoto-Sivashinsky equation in R^1 and R^2: effective estimates of the high-frequency tails and higher Sobolev norms
null
null
null
null
math.DS
null
We consider the Kuramoto-Sivashinsky (KS) equation in finite domains of the form $[-L,L]^d$. Our main result provides refined Gevrey estimates for the solutions of the one dimensional differentiated KS, which in turn imply effective new estimates for higher Sobolev norms of the solutions in terms of powers of $L$. We illustrate our method on a simpler model, namely the regularized Burger's equation. We also show local well-posedness for the two dimensional KS equation and provide an explicit criteria for (eventual) blow-up in terms of its $L^2$ norm. The common underlying idea in both results is that {\it a priori} control of the $L^2$ norm is enough in order to conclude higher order regularity and allows one to get good estimates on the high-frequency tails of the solutions.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:01:02 GMT" } ]
2007-11-27T00:00:00
[ [ "Stanislavova", "Milena", "" ], [ "Stefanov", "Atanas", "" ] ]
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711.4006
Yan V. Fyodorov
Yan V Fyodorov and Jean-Philippe Bouchaud
Statistical mechanics of a single particle in a multiscale random potential: Parisi landscapes in finite dimensional Euclidean spaces
25 pages, published version with a few misprints corrected
J. Phys.A: Math.Theor. 41 (2008) 324009 (25pp)
10.1088/1751-8113/41/32/324009
null
cond-mat.dis-nn cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a N-dimensional Gaussian landscape with multiscale, translation invariant, logarithmic correlations and investigate the statistical mechanics of a single particle in this environment. In the limit of high dimension N>>1 the free energy of the system and overlap function are calculated exactly using the replica trick and Parisi's hierarchical ansatz. In the thermodynamic limit, we recover the most general version of the Derrida's Generalized Random Energy Model (GREM). The low-temperature behaviour depends essentially on the spectrum of length scales involved in the construction of the landscape. If the latter consists of K discrete values, the system is characterized by a K-step Replica Symmetry Breaking solution. We argue that our construction is in fact valid in any finite spatial dimensions $N\ge 1$. We discuss implications of our results for the singularity spectrum describing multifractality of the associated Boltzmann-Gibbs measure. Finally we discuss several generalisations and open problems, the dynamics in such a landscape and the construction of a Generalized Multifractal Random Walk.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:04:48 GMT" }, { "version": "v2", "created": "Mon, 18 Aug 2008 18:37:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Fyodorov", "Yan V", "" ], [ "Bouchaud", "Jean-Philippe", "" ] ]
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711.4007
Satyan Bhongale
S. G. Bhongale and Eddy Timmermans
BEC "level" for measuring small forces
4 pages, 4 figures
Phys. Rev. Lett. 100, 185301 (2008)
10.1103/PhysRevLett.100.185301
null
cond-mat.other quant-ph
null
We propose a device that consists of a trapped two-component phase- separated Bose-Einstein condensate to measure small forces and map weak potential energy landscapes. The resolution as well as the measurement precision of this device can be set dynamically, allowing measurements at multiple scales.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:12:03 GMT" } ]
2010-11-25T00:00:00
[ [ "Bhongale", "S. G.", "" ], [ "Timmermans", "Eddy", "" ] ]
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