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711.2908
Shin'ichiro Ando
Shin'ichiro Ando (Caltech), John F. Beacom (Ohio State), Stefano Profumo (UCSC/Caltech), David Rainwater (Rochester)
Probing new physics with long-lived charged particles produced by atmospheric and astrophysical neutrinos
27 pages, 6 figures; accepted for publication in JCAP
JCAP 0804:029,2008
10.1088/1475-7516/2008/04/029
null
hep-ph astro-ph
null
As suggested by some extensions of the Standard Model of particle physics, dark matter may be a super-weakly interacting lightest stable particle, while the next-to-lightest particle (NLP) is charged and meta-stable. One could test such a possibility with neutrino telescopes, by detecting the charged NLPs produced in high-energy neutrino collisions with Earth matter. We study the production of charged NLPs by both atmospheric and astrophysical neutrinos; only the latter, which is largely uncertain and has not been detected yet, was the focus of previous studies. We compute the resulting fluxes of the charged NLPs, compare those of different origins, and analyze the dependence on the underlying particle physics setup. We point out that even if the astrophysical neutrino flux is very small, atmospheric neutrinos, especially those from the prompt decay of charmed mesons, may provide a detectable flux of NLP pairs at neutrino telescopes such as IceCube. We also comment on the flux of charged NLPs expected from proton-nucleon collisions, and show that, for theoretically motivated and phenomenologically viable models, it is typically sub-dominant and below detectable rates.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 20:04:33 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 19:21:25 GMT" } ]
2009-01-06T00:00:00
[ [ "Ando", "Shin'ichiro", "", "Caltech" ], [ "Beacom", "John F.", "", "Ohio State" ], [ "Profumo", "Stefano", "", "UCSC/Caltech" ], [ "Rainwater", "David", "", "Rochester" ] ]
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711.2909
Krzysztof R. Apt
Krzysztof R. Apt, Francesca Rossi, Kristen Brent Venable
Comparing the notions of optimality in CP-nets, strategic games and soft constraints
39 pages. To appear in Annals of Mathematics and Artificial Intelligence
null
null
null
cs.AI cs.GT
null
The notion of optimality naturally arises in many areas of applied mathematics and computer science concerned with decision making. Here we consider this notion in the context of three formalisms used for different purposes in reasoning about multi-agent systems: strategic games, CP-nets, and soft constraints. To relate the notions of optimality in these formalisms we introduce a natural qualitative modification of the notion of a strategic game. We show then that the optimal outcomes of a CP-net are exactly the Nash equilibria of such games. This allows us to use the techniques of game theory to search for optimal outcomes of CP-nets and vice-versa, to use techniques developed for CP-nets to search for Nash equilibria of the considered games. Then, we relate the notion of optimality used in the area of soft constraints to that used in a generalization of strategic games, called graphical games. In particular we prove that for a natural class of soft constraints that includes weighted constraints every optimal solution is both a Nash equilibrium and Pareto efficient joint strategy. For a natural mapping in the other direction we show that Pareto efficient joint strategies coincide with the optimal solutions of soft constraints.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:14:27 GMT" }, { "version": "v2", "created": "Mon, 21 Apr 2008 10:47:41 GMT" } ]
2008-04-21T00:00:00
[ [ "Apt", "Krzysztof R.", "" ], [ "Rossi", "Francesca", "" ], [ "Venable", "Kristen Brent", "" ] ]
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711.291
Sergey Storchak
S. N. Storchak
Path integral measure factorization in path integrals for diffusion of Yang--Mills fields
34 pages
null
null
null
hep-th
null
Factorization of the (formal) path integral measure in a Wiener path integrals for Yang--Mills diffusion is studied. Using the nonlinear filtering stochastic differential equation, we perform the transformation of the path integral defined on a total space of the Yang--Mills principal fiber bundle and come to the reduced path integral on a Coulomb gauge surface. Integral relation between the path integral representing the "quantum" evolution given on the original manifold of Yang--Mills fields and the path integral on the reduced manifold defined by the Coulomb gauge is obtained.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:17:00 GMT" } ]
2007-11-20T00:00:00
[ [ "Storchak", "S. N.", "" ] ]
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711.2911
Daniel Lawson
Daniel John Lawson and Henrik Jeldtoft Jensen
Understanding clustering in type space using field theoretic techniques
Accepted, Bulletin of Mathematical Biology
null
null
null
q-bio.PE q-bio.QM
null
The birth/death process with mutation describes the evolution of a population, and displays rich dynamics including clustering and fluctuations. We discuss an analytical `field-theoretical' approach to the birth/death process, using a simple dimensional analysis argument to describe evolution as a `Super-Brownian Motion' in the infinite population limit. The field theory technique provides corrections to this for large but finite population, and an exact description at arbitrary population size. This allows a characterisation of the difference between the evolution of a phenotype, for which strong local clustering is observed, and a genotype for which distributions are more dispersed. We describe the approach with sufficient detail for non-specialists.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:17:54 GMT" } ]
2007-11-20T00:00:00
[ [ "Lawson", "Daniel John", "" ], [ "Jensen", "Henrik Jeldtoft", "" ] ]
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711.2912
Viktor Begun
Viktor V. Begun
Multiplicity fluctuations in relativistic gases. From simple models to experiment
To appear in the proceedings of The International Workshop Relativistic Nuclear Physics: from Nuclotron to LHC energies, Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine, June 18-22, 2007
Phys.Atom.Nucl.71:1813-1823,2008
10.1134/S1063778808100165
null
nucl-th
null
The aim of this paper is to give a short overview for the set of publications considering recently found effect of non-equivalence of multiplicity fluctuations in relativistic gases with globally conserved charge and energy.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:20:59 GMT" } ]
2009-05-29T00:00:00
[ [ "Begun", "Viktor V.", "" ] ]
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711.2913
Michael Tung M.
M.M. Tung, L. Soler, E. Defez, and A. Hervas
Cubic-matrix splines and second-order matrix models
5 pages
Progress in Industrial Mathematics at ECMI 2006 (edited by L. L. Bonilla, M. A. Moscoso, G. Platero, and J. M. Vega), vol. 12 of Mathematics in Industry, pp. 949-953 (Springer, Berlin, 2007), ISBN 978-3-540-71991-5
null
null
math.NA
null
We discuss the direct use of cubic-matrix splines to obtain continuous approximations to the unique solution of matrix models of the type $Y''(x) = f(x,Y(x))$. For numerical illustration, an estimation of the approximation error, an algorithm for its implementation, and an example are given.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:22:18 GMT" } ]
2007-11-20T00:00:00
[ [ "Tung", "M. M.", "" ], [ "Soler", "L.", "" ], [ "Defez", "E.", "" ], [ "Hervas", "A.", "" ] ]
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711.2914
Tshilidzi Marwala
Gidudu Anthony, Hulley Gregg and Marwala Tshilidzi
Image Classification Using SVMs: One-against-One Vs One-against-All
Proccedings of the 28th Asian Conference on Remote Sensing, 2007
null
null
null
cs.LG cs.AI cs.CV
null
Support Vector Machines (SVMs) are a relatively new supervised classification technique to the land cover mapping community. They have their roots in Statistical Learning Theory and have gained prominence because they are robust, accurate and are effective even when using a small training sample. By their nature SVMs are essentially binary classifiers, however, they can be adopted to handle the multiple classification tasks common in remote sensing studies. The two approaches commonly used are the One-Against-One (1A1) and One-Against-All (1AA) techniques. In this paper, these approaches are evaluated in as far as their impact and implication for land cover mapping. The main finding from this research is that whereas the 1AA technique is more predisposed to yielding unclassified and mixed pixels, the resulting classification accuracy is not significantly different from 1A1 approach. It is the authors conclusion therefore that ultimately the choice of technique adopted boils down to personal preference and the uniqueness of the dataset at hand.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:25:00 GMT" } ]
2007-11-20T00:00:00
[ [ "Anthony", "Gidudu", "" ], [ "Gregg", "Hulley", "" ], [ "Tshilidzi", "Marwala", "" ] ]
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711.2915
John Chick
J. M. Chick
Carmichael number variable relations: three-prime Carmichael numbers up to 10^24
37 pages; 5 tables; amended version contains a minor factual correction on page 25 immediately before Challenge 4, an updated reference and 6 very minor textual improvements
null
null
null
math.NT
null
Bounds and other relations involving variables connected with Carmichael numbers are reviewed and extended. Families of numbers or individual numbers attaining or approaching these bounds are given. A new algorithm for finding three-prime Carmichael numbers is described, with its implementation up to $10^{24}$. Statistics relevant to the distribution of three-prime Carmichael numbers are given, with particular reference to the conjecture of Granville and Pomerance in [A.Granville and C.Pomerance, Two contradictory conjectures concerning Carmichael numbers, Math. Comp. 71 (2001), 883-908].
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:26:48 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 12:02:14 GMT" } ]
2008-02-27T00:00:00
[ [ "Chick", "J. M.", "" ] ]
[ 0.0816504881, -0.0395252518, 0.0854674801, 0.0489294417, -0.0935440212, -0.020813683, 0.065995276, -0.01267491, -0.0418763012, -0.0544336587, 0.1163906679, -0.1013992801, -0.0462188236, 0.0646676272, 0.023358345, -0.0119972555, -0.0212009139, 0.0564804524, 0.1136247292, 0.1088119969, 0.0077515412, 0.0432039499, -0.0271476805, 0.0388890877, 0.0666037872, -0.0431486331, -0.0256955624, -0.0429826751, 0.0887312889, -0.1361947805, 0.0349614546, -0.0568676852, -0.0677654818, -0.0506443232, -0.0481826365, 0.0922716856, -0.0807100683, 0.0422082134, -0.065995276, 0.0867398158, -0.0490124188, 0.0013509878, -0.0532719642, 0.0591357537, -0.0113472603, -0.022404097, -0.0303423386, -0.0547102503, -0.0630080625, 0.0418209806, -0.1163906679, 0.0694803596, -0.0209796391, 0.0449464917, 0.0511421934, 0.0996290818, -0.0531336665, 0.0070496844, -0.0046813497, -0.0334401876, 0.0440613925, -0.0741824582, 0.0102477996, -0.0003351539, -0.073573947, 0.0326380655, -0.0178126395, 0.0465507358, 0.1060460582, 0.0284061823, -0.1382969022, 0.069425039, 0.1033354402, 0.080046244, 0.0490953997, 0.0365656987, -0.0038411962, -0.0121078929, -0.0814292133, 0.0189190153, 0.1544499695, 0.007537181, -0.055401735, -0.062565513, -0.009169084, 0.036842294, 0.0723569393, 0.0014529817, -0.1017865166, -0.0336338058, 0.0343252905, -0.0107387537, 0.032859344, 0.0779441297, 0.0387507901, -0.0756207407, 0.0792717785, 0.0864078999, 0.0076893074, 0.0557889678, -0.1599818468, 0.0280051213, 0.0581400134, -0.0198317748, 0.0537421741, 0.0932674259, -0.010925455, -0.0022110217, -0.0442273468, -0.005303686, -0.0604080856, -0.0571995974, -0.0906121284, 0.1125183553, -0.029014688, 0.0821483582, -0.007613244, 0.0073850541, -0.1062120125, -0.0396912098, -0.0276732091, -0.0253774803, 0.1240246594, -0.131326735, 0.067931436, -0.0265806634, 0.0064757522, -0.1276756972, 0.0183934867, 0.0246030185, 0.1333182007, -0.0169690289, 0.1089779511, 0.0484868921, -0.0427337401, -0.021449849, 0.0580846965, -0.1569946408, 0.0124536352, -0.0069459616, 0.1243565679, 0.0062579345, 0.0571442768, 0.0301763825, 0.1256842166, 0.0746250078, -0.0611272268, 0.0293742605, -0.0320295617, -0.0813185722, -0.0749015957, -0.0105174789, 0.0657740012, -0.0571995974, 0.0024029086, -0.0679867566, 0.0038377389, 0.1080375314, 0.0177020021, -0.0259998161, -0.0079866461, 0.029899789, -0.047269877, -0.0452507436, 0.0785526335, 0.1152842939, -0.0969737843, 0.0378103703, -0.1009567305, -0.0545166358, 0.0626208335, -0.0647229478, -0.0758420154, -0.1059907377, -0.0341040157, -0.0074265432, -0.0617357343, -0.0432316102, -0.0420422554, -0.002328574, 0.0374231413, 0.0195690114, -0.023994511, -0.0752888322, 0.0034021037, 0.0427060798, 0.0589144789, -0.0256540738, 0.073573947, 0.0015402817, 0.0369252712, 0.0627314746, 0.1193778813, 0.1178289577, 0.0447805338, -0.144935146, 0.0497868806, -0.0085536633, -0.0112919416, -0.0569783226, 0.0274381042, -0.0051342724, 0.0091967434, 0.0329146609, -0.0143413879, -0.0590804331, -0.0841951519, 0.0232753679, -0.1048843637, -0.0590804331, 0.0344635881, -0.0505890027, 0.0219338872, 0.1034460813, -0.0658293217, -0.0292636231, -0.0246445071, -0.0005588059, -0.0590251163, 0.0518613346, 0.0119765112, 0.0698122755, 0.0113334302, 0.0470209457, 0.0544336587, 0.0673229322, 0.0553187579, 0.0084775994, 0.0638378486, 0.043452885, 0.0268295985, 0.0359018743, -0.0132211829, -0.0162775442, 0.050063476, 0.0583612882, 0.0440890491, 0.0271891691, -0.0822589919, -0.0850249305, 0.0320848785, 0.0600761697, 0.0026967896, 0.094484441, -0.0573655516, 0.0055768224, -0.0285721384, -0.0892844722, -0.0474081747, 0.0359571911, -0.0544059984, -0.0523315445, 0.0070185675, -0.0278806537, -0.0409635417, 0.0546272732 ]
711.2916
Eric Wille
E. Wille, F.M. Spiegelhalder, G. Kerner, D. Naik, A. Trenkwalder, G. Hendl, F. Schreck, R. Grimm, T.G. Tiecke, J.T.M. Walraven, S.J.J.M.F. Kokkelmans, E. Tiesinga, P.S. Julienne
Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
4 pages, 4 figures, 1 table
Phys. Rev. Lett. 100, 053201 (2008)
10.1103/PhysRevLett.100.053201
null
cond-mat.other
null
We report on the observation of Feshbach resonances in an ultracold mixture of two fermionic species, 6Li and 40K. The experimental data are interpreted using a simple asymptotic bound state model and full coupled channels calculations. This unambiguously assigns the observed resonances in terms of various s- and p-wave molecular states and fully characterizes the ground-state scattering properties in any combination of spin states.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 20:34:12 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 13:05:49 GMT" } ]
2008-02-05T00:00:00
[ [ "Wille", "E.", "" ], [ "Spiegelhalder", "F. M.", "" ], [ "Kerner", "G.", "" ], [ "Naik", "D.", "" ], [ "Trenkwalder", "A.", "" ], [ "Hendl", "G.", "" ], [ "Schreck", "F.", "" ], [ "Grimm", "R.", "" ], [ "Tiecke", "T. G.", "" ], [ "Walraven", "J. T. M.", "" ], [ "Kokkelmans", "S. J. J. M. F.", "" ], [ "Tiesinga", "E.", "" ], [ "Julienne", "P. S.", "" ] ]
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711.2917
Anne-Marie Vercoustre
James A. Thom (RMIT), Jovan Pehcevski (INRIA Rocquencourt / INRIA Sophia Antipolis), Anne-Marie Vercoustre (INRIA Rocquencourt / INRIA Sophia Antipolis)
Use of Wikipedia Categories in Entity Ranking
null
Dans The 12th Australasian Document Computing Symposium (ADCS'07) (2007)
null
null
cs.IR
null
Wikipedia is a useful source of knowledge that has many applications in language processing and knowledge representation. The Wikipedia category graph can be compared with the class hierarchy in an ontology; it has some characteristics in common as well as some differences. In this paper, we present our approach for answering entity ranking queries from the Wikipedia. In particular, we explore how to make use of Wikipedia categories to improve entity ranking effectiveness. Our experiments show that using categories of example entities works significantly better than using loosely defined target categories.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:35:48 GMT" } ]
2007-11-20T00:00:00
[ [ "Thom", "James A.", "", "RMIT" ], [ "Pehcevski", "Jovan", "", "INRIA Rocquencourt / INRIA\n Sophia Antipolis" ], [ "Vercoustre", "Anne-Marie", "", "INRIA Rocquencourt / INRIA Sophia\n Antipolis" ] ]
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711.2918
Yanyang Zhang
Yan-Yang Zhang, Jiang-Ping Hu, B.A. Bernevig, X. R. Wang, X. C. Xie and W. M. Liu
Quantum Blockades and Loop Currents in Graphene with Topological Defects
6 pages, 7 figures
Phys. Rev. B 78, 155413 (2008)
10.1103/PhysRevB.78.155413
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the effect of topological defects on the transport properties of a narrow ballistic ribbon of graphene with zigzag edges. Our results show that the longitudinal conductance vanishes at several discrete Fermi energies where the system develops loop orbital electric currents with certain chirality. The chirality depends on the direction of the applied bias voltage and the sign of the local curvature created by the topological defects. This novel quantum blockade phenomenon provides a new way to generate a magnetic moment by an external electric field, which can prove useful in carbon electronics.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:37:36 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 01:42:37 GMT" }, { "version": "v3", "created": "Sat, 11 Oct 2008 03:32:52 GMT" } ]
2008-10-11T00:00:00
[ [ "Zhang", "Yan-Yang", "" ], [ "Hu", "Jiang-Ping", "" ], [ "Bernevig", "B. A.", "" ], [ "Wang", "X. R.", "" ], [ "Xie", "X. C.", "" ], [ "Liu", "W. M.", "" ] ]
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711.2919
Charles Bonatto
Charles Bonatto and Eduardo Bica
Structural parameters of star clusters: relations among light, mass and star-count radial profiles and the dependence on photometric depth
10 pages and 9 figures. Accepted by A&A
null
10.1051/0004-6361:20078616
null
astro-ph
null
Structural parameters of model star clusters are measured in radial profiles built from number-density, mass-density and surface-brightness distributions, assuming as well different photometric conditions. Star clusters of different ages, structure and mass functions are modelled by assuming that the radial distribution of stars follows a pre-defined analytical form. Near-infrared surface brightness and mass-density profiles result from mass-luminosity relations taken from a set of isochrones. Core, tidal and half-light, half-mass and half-star count radii, together with the concentration parameter, are measured in the three types of profiles, which are built under different photometric depths. While surface-brightness profiles are almost insensitive to photometric depth, radii measured in number-density and mass-density profiles change significantly with it. Compared to radii derived with deep photometry, shallow profiles result in lower values. This effect increases for younger ages. Radial profiles of clusters with a spatially-uniform mass function produce radii that do not depend on depth. With deep photometry, number-density profiles yield radii systematically larger than those derived from surface-brightness ones. In general, low-noise surface-brightness profiles result in uniform structural parameters that are essentially independent of photometric depth. For less-populous star clusters, those projected against dense fields and/or distant ones, which result in noisy surface-brightness profiles, this work provides a quantitative way to estimate the intrinsic radii by means of number-density profiles built with depth-limited photometry.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:54:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Bonatto", "Charles", "" ], [ "Bica", "Eduardo", "" ] ]
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711.292
Shuichiro Yokoyama
Shuichiro Yokoyama, Teruaki Suyama, Takahiro Tanaka
Primordial Non-Gaussianity in Multi-Scalar Inflation
11 pages, 6 figures, few typos fixed
null
null
KUNS-2110
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a concise formula for the non-Gaussianity of the primordial curvature perturbation generated on super-horizon scales in multi-scalar inflation model without assuming slow-roll conditions. This is an extension of our previous work. Using this formula, we study the generation of non-Gaussianity for the double inflation models in which the slow-roll conditions are temporarily violated after horizon exit, and we show that the non-linear parameter $f_{NL}$ for such models is suppressed by the slow-roll parameters evaluated at the time of horizon exit.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:54:57 GMT" }, { "version": "v2", "created": "Mon, 21 Apr 2008 14:14:31 GMT" }, { "version": "v3", "created": "Thu, 10 Jan 2013 03:35:08 GMT" } ]
2013-01-11T00:00:00
[ [ "Yokoyama", "Shuichiro", "" ], [ "Suyama", "Teruaki", "" ], [ "Tanaka", "Takahiro", "" ] ]
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711.2921
Zhi-Gang Wang
Zhi-Gang Wang, Zhi-Bin Wang
Electromagnetic form-factor of the $\pi$ meson with light-cone QCD sum rules
16 pages, 3 figures, 5 version
Int.J.Mod.Phys.A23:4621-4636,2008
10.1142/S0217751X08041499
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we calculate the electromagnetic form-factor of the $\pi$ meson with the light-cone QCD sum rules. The numerical value $F_\pi^{p}(0) =0.999\pm 0.001$ is in excellent agreement with the experimental data (extrapolated to the limit of zero momentum transfer, or the normalization condition $F_\pi(0)=1$). For large momentum transfers, the values from the two sum rules are all comparable with the experimental data and theoretical estimations.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 12:59:04 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 02:14:06 GMT" }, { "version": "v3", "created": "Thu, 1 May 2008 07:47:59 GMT" }, { "version": "v4", "created": "Tue, 13 May 2008 10:44:21 GMT" }, { "version": "v5", "created": "Sat, 14 Jun 2008 03:20:27 GMT" } ]
2008-12-18T00:00:00
[ [ "Wang", "Zhi-Gang", "" ], [ "Wang", "Zhi-Bin", "" ] ]
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711.2922
Richard Pettigrew
J. P. Mayberry and Richard Pettigrew
Natural Number Arithmetic in the Theory of Finite Sets
53 pages; second version; section 6 added; section 12 revised; material added on connection with bounded arithmetic
null
null
null
math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a theory of finite sets, and investigate the analogue of Dedekind's theory of natural number systems (simply infinite systems) in this theory. Unlike the infinitary case, in our theory, natural number systems come in differing lengths and with different closure properties. We give examples of natural number systems incomparable in length; we define hierarchies of natural number systems closed under increasingly powerful functions; and we describe a method by which to construct natural number systems with given closure properties. These natural number systems form natural models for various systems of weak arithmetic.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:29:18 GMT" }, { "version": "v2", "created": "Fri, 8 Aug 2008 10:47:06 GMT" } ]
2008-08-08T00:00:00
[ [ "Mayberry", "J. P.", "" ], [ "Pettigrew", "Richard", "" ] ]
[ -0.0669742003, 0.0120236864, 0.096827805, 0.0322104655, 0.0999702886, -0.0092433235, 0.0371696986, 0.0348373875, -0.0750268176, 0.0917703658, 0.0420798324, -0.1258957833, -0.130707711, -0.0160806831, 0.1726402491, -0.0216291323, 0.04939593, 0.0111951008, 0.074535802, 0.0682999343, -0.0463025458, 0.0688400492, -0.0083840508, -0.0564665198, 0.0969260111, -0.1429830492, 0.0101148719, 0.0460815914, 0.0382008292, -0.0612293482, 0.0350828953, -0.0235931855, -0.0405822434, 0.0497641899, 0.0156878717, 0.0738483891, -0.0234090555, 0.0527839214, -0.0185848493, 0.011784317, -0.0172959398, 0.0266374666, -0.1244227514, -0.0418097749, 0.0020054821, 0.1250119656, 0.0896099135, -0.0208066851, -0.0116799772, -0.0025302526, -0.0968769044, 0.0182779673, 0.0259991493, -0.0760088488, -0.0389864482, 0.0368996412, -0.0601982214, 0.0041459929, -0.0223165508, -0.0512126796, 0.028405115, -0.0722280443, -0.0000432753, 0.0202911217, -0.122556895, 0.0089609912, -0.0420798324, 0.0687909499, 0.1316897422, 0.093292512, -0.066925101, 0.0548952781, 0.0050052661, 0.1035055816, 0.0108022904, 0.0511144735, 0.0243788064, 0.033732608, -0.0530294254, 0.0738483891, 0.0927523971, -0.018842632, 0.030025458, -0.0178483296, 0.0554844923, 0.018719878, 0.0347637348, 0.0748795122, -0.1154863089, -0.035107445, 0.0561228096, -0.0993810743, 0.0163630154, 0.0070214891, 0.0449522585, -0.0208435114, 0.0537168458, 0.01411663, -0.038569089, -0.0122139538, -0.0504761599, -0.0640281215, 0.0007269297, -0.0362858772, 0.07163883, 0.102228947, 0.0633898079, -0.0547970757, -0.1351268291, -0.0370960496, -0.1058624461, -0.0323086679, -0.0242437776, -0.0470145158, -0.0551407821, -0.0188917331, -0.1547673643, 0.0486103073, -0.0081262691, -0.0296326466, 0.0111337248, -0.0187935308, 0.12452095, 0.0203524977, 0.1091031358, -0.0129872998, 0.0137238195, 0.0081017176, 0.0083963256, 0.0512126796, 0.1411172003, -0.0147426715, -0.0760579482, -0.0059075025, -0.0597563088, -0.0606401302, -0.0409505032, 0.0516054891, 0.0209662635, -0.1087103263, 0.1280562431, -0.0772363767, 0.013097777, 0.0958457813, -0.0303937178, 0.0050420919, -0.0156387705, 0.0210890174, 0.1010505185, -0.0328733362, 0.0239491686, 0.0423007868, 0.0815572962, 0.0222674496, 0.0627514869, -0.1383675188, 0.008555905, -0.0207453091, 0.04126966, -0.0191126894, 0.1123438254, 0.0694292709, -0.0184375457, 0.0349601395, -0.0025824227, 0.080968082, -0.1032109782, -0.0096054459, -0.0341745205, -0.0106734, -0.066139482, -0.0543060601, -0.0779728964, -0.0889715925, -0.0179219823, 0.0396984182, -0.074388504, -0.0799860507, -0.0632425025, 0.0041153044, -0.0688400492, 0.0592652932, -0.1318861544, 0.005097331, 0.091966778, -0.005953535, 0.0289697796, 0.0669742003, 0.059510801, -0.0841105655, -0.0044221878, 0.031694904, 0.1076300964, 0.0971224159, 0.0026698844, -0.1082193106, 0.0008861254, 0.0385936387, 0.0191495158, 0.0018290242, -0.0000786868, 0.047431875, 0.1581062526, 0.0475055277, -0.0027619493, 0.0134905884, -0.0127295172, -0.0607874356, -0.0841596648, -0.0420552827, -0.0363104269, -0.0100719081, 0.0693310648, 0.0638808161, -0.0397966206, 0.0571048371, -0.0538641475, 0.0257536434, -0.0252135284, 0.1554547846, 0.0555826947, -0.0242192261, -0.0196282528, 0.0560246073, 0.0023491913, 0.0152582359, 0.0383235812, 0.059559904, 0.0317440033, -0.0395020135, 0.0722280443, 0.0513599813, -0.1204946414, -0.0139079494, -0.0523420088, 0.0999702886, 0.0039956202, 0.0185480248, -0.0342481732, -0.0213468, -0.04055769, 0.0495923348, -0.0894135088, 0.0882350728, -0.0027742246, 0.0667286962, -0.0687909499, 0.0298045017, 0.0113546802, -0.0785621107, -0.0402139835, -0.0788567215, 0.0038329719, 0.0157369729, -0.068349041, -0.0427426994 ]
711.2923
Brent Miszalski
B. Miszalski, Q. A. Parker, A. Acker, J. L. Birkby, D. J. Frew and A. Kovacevic
MASH-II: More Planetary Nebulae from the AAO/UKST H\alpha Survey
10 pages, 8 figures. Accepted for publication in MNRAS. Catalogue will be available from vizier
null
10.1111/j.1365-2966.2007.12727.x
null
astro-ph
null
We present a supplement to the Macquarie/AAO/Strasbourg H$\alpha$ planetary nebulae (PNe) catalogue (MASH), which we denote MASH-II. The supplement consists of over 300 true, likely and possible new Galactic PNe found after re-examination of the entire AAO/UKST H$\alpha$ survey of the southern Galactic Plane in digital form. We have spectroscopically confirmed over 240 of these new candidates as bona-fide PNe and we include other high quality candidates awaiting spectroscopic confirmation as possible PNe. These latest discoveries largely comprise two distinct groups: small, star-like or moderately resolved PNe at one end and mostly large, extremely low surface brightness PNe at the other. Neither group were easy to discover from simple visual scrutiny of the original survey exposures as for MASH but were relatively straightforward to uncover from the digital images via application of semi-automated discovery techniques. We suspect the few PNe still hidden in the H$\alpha$ survey will lie outside our search criteria or be difficult to find.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:19:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Miszalski", "B.", "" ], [ "Parker", "Q. A.", "" ], [ "Acker", "A.", "" ], [ "Birkby", "J. L.", "" ], [ "Frew", "D. J.", "" ], [ "Kovacevic", "A.", "" ] ]
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711.2924
Hao Yanhong
Huihui Dai, Yanhong Hao, Zhen Chen
On Constructing the Analytical Solutions for Localizations in a Slender Cylinder Composed of an Incompressible Hyperelastic Material
27 pages 10 figures
null
null
null
physics.class-ph physics.comp-ph
null
In this paper, we study the localization phenomena in a slender cylinder composed of an incompressible hyperelastic material subjected to axial tension. We aim to construct the analytical solutions based on a three-dimensional setting and use the analytical results to describe the key features observed in the experiments by others. Using a novel approach of coupled series-asymptotic expansions, we derive the normal form equation of the original governing nonlinear partial differential equations. By writing the normal form equation into a first-order dynamical system and with the help of the phase plane, we manage to solve two boundary-value problems analytically. The explicit solution expressions (in terms of integrals) are obtained. By analyzing the solutions, we find that the width of the localization zone depends on the material parameters but remains almost unchanged for the same material in the post-peak region. Also, it is found that when the radius-length ratio is relatively small there is a snap-back phenomenon. These results are well in agreement with the experimental observations. Through an energy analysis, we also deduce the preferred configuration and give a prediction when a snap-through can happen. Finally, based on the maximum-energy-distortion theory, an analytical criterion for the onset of material failure is provided.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:21:18 GMT" } ]
2007-11-20T00:00:00
[ [ "Dai", "Huihui", "" ], [ "Hao", "Yanhong", "" ], [ "Chen", "Zhen", "" ] ]
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711.2925
Werner Mueller
Erez Lapid, Werner Mueller
Spectral asymptotics for arithmetic quotients of SL(n,R)/SO(n)
31 pages
Duke Math. J. 149, no. 1 (2009), 117-155
10.1215/00127094-2009-037
null
math.RT math.SP
null
In this paper we study the asymptotic distribution of the cuspidal spectrum of arithmetic quotients of the symmetric space S=SL(n,R)/SO(n). In particular, we obtain Weyl's law with an estimation on the remainder term. This extends results of Duistermaat-Kolk-Varadarajan on spectral asymptotics for compact locally symmetric spaces to this non-compact setting.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:21:53 GMT" } ]
2019-12-19T00:00:00
[ [ "Lapid", "Erez", "" ], [ "Mueller", "Werner", "" ] ]
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711.2926
I. Rotter
Ingrid Rotter
Non-Hermitian Hamilton operator in open quantum systems
24 pages
null
null
null
quant-ph
null
In the Feshbach projection operator (FPO) formalism the whole function space is divided into two subspaces. One of them contains the wave functions localized in a certain finite region while the continuum of extended scattering wave functions is involved in the other subspace. The Hamilton operator of the whole system is Hermitian, that of the localized part is, however, non-Hermitian. This non-Hermitian Hamilton operator $H_{\rm eff}$ represents the core of the FPO method in present-day studies. It gives a unified description of discrete and resonance states. Furthermore, it contains the time operator. The eigenvalues $z_\lambda$ and eigenfunctions $\phi_\lambda$ of $H_{\rm eff}$ are an important ingredient of the $S$ matrix. They are energy dependent. The phases of the $\phi_\lambda$ are, generally, nonrigid. Most interesting physical effects are caused by the branch points in the complex plane. On the one hand, they cause the avoided level crossings that appear as level repulsion or widths bifurcation in approaching the branch points under different conditions. On the other hand, observable values are usually enhanced and accelerated in the vicinity of the branch points. In most cases, the theory is time asymmetric. An exception are the ${\cal PT}$ symmetric bound states in the continuum appearing in space symmetric systems due to the avoided level crossing phenomenon in the complex plane. In the paper, the peculiarities of the FPO method are considered and three typical phenomena are sketched: (i) the unified description of decay and scattering processes, (ii) the appearance of bound states in the continuum and (iii) the spectroscopic reordering processes characteristic of the regime with overlapping resonances.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:34:12 GMT" } ]
2007-11-20T00:00:00
[ [ "Rotter", "Ingrid", "" ] ]
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711.2927
Thomas Larsson
T. A. Larsson
A BV subtlety
8 pages
null
null
null
math-ph math.MP
null
The standard BV complex is never acyclic provided that the equations of motion have solutions and the admissible class of functions is general enough, unless one introduces second-order antifields. This phenomenon is explicitly illustrated for the harmonic oscillator and the free electromagnetic field.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:39:19 GMT" } ]
2007-11-20T00:00:00
[ [ "Larsson", "T. A.", "" ] ]
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711.2928
Jonathan Bowden
Jonathan Bowden
The topology of symplectic circle bundles
null
Trans. Amer. Math. Soc. 361 (2009), no. 10, 5457--5468
null
null
math.GT math.SG
null
We consider circle bundles over compact three-manifolds with symplectic total spaces. We show that the base of such a space must be irreducible or the product of the two-sphere with the circle. We then deduce that such a bundle admits a symplectic form if and only if it admits one that is invariant under the circle action in three special cases: namely if the base is Seifert fibered, has vanishing Thurston norm, or if the total space admits a Lefschetz fibration.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:45:26 GMT" } ]
2011-05-19T00:00:00
[ [ "Bowden", "Jonathan", "" ] ]
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711.2929
Matthias Liebendoerfer
M. Liebendoerfer, S. C. Whitehouse, T. Fischer
The isotropic diffusion source approximation for supernova neutrino transport
revised version, 19 pages, 10 figures, submitted to ApJ
Astrophys.J.698:1174-1190,2009
10.1088/0004-637X/698/2/1174
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Astrophysical observations originate from matter that interacts with radiation or transported particles. We develop a pragmatic approximation in order to enable multi-dimensional simulations with basic spectral radiative transfer when the computational resources are not sufficient to solve the complete Boltzmann transport equation. The distribution function of the transported particles is decomposed into trapped and streaming particle components. Their separate evolution equations are coupled by a source term that converts trapped particles into streaming particles. We determine this source term by requiring the correct diffusion limit. For a smooth transition to the free streaming regime, this 'diffusion source' is limited by the matter emissivity. The resulting streaming particle emission rates are integrated over space to obtain the streaming particle flux. A geometric estimate of the flux factor is used to convert the particle flux to the streaming particle density. The efficiency of the scheme results from the freedom to use different approximations for each particle component. In supernovae, reactions with trapped particles on fast time scales establish equilibria that reduce the number of primitive variables required to evolve the trapped particle component. On the other hand, a stationary-state approximation facilitates the treatment of the streaming particle component. Different approximations may apply in applications to stellar atmospheres, star formation, or cosmological radiative transfer. We compare the isotropic diffusion source approximation with Boltzmann neutrino transport of electron flavour neutrinos in spherically symmetric supernova models and find good agreement. An extension of the scheme to the multi-dimensional case is also discussed.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:45:53 GMT" }, { "version": "v2", "created": "Wed, 21 Jan 2009 21:32:04 GMT" } ]
2009-06-23T00:00:00
[ [ "Liebendoerfer", "M.", "" ], [ "Whitehouse", "S. C.", "" ], [ "Fischer", "T.", "" ] ]
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711.293
Daniel Senff
D. Senff, P. Link, N. Aliouane, D. N. Argyriou, and M. Braden
Field dependence of magnetic correlations through the polarization flop transition in multiferroic TbMnO3 : evidence for a magnetic memory effect
4 pages, 4 figures
null
10.1103/PhysRevB.77.174419
null
cond-mat.str-el
null
The field-induced multiferroic transition in TbMnO3 has been studied by neutron scattering. Apart strong hysteresis, the magnetic transition associated with the flop of electronic polarization exhibits a memory effect: after a field sweep, TbMnO3 does not exhibit the same phase as that obtained by zero-field cooling. The strong changes in the magnetic excitations across the transition perfectly agree with a rotation of the cycloidal spiral plane indicating that the inverse Dzyaloshinski-Moriya coupling causes the giant magnetoelectric effect at the field-induced transition. The analysis of the zone-center magnetic excitations identifies the electromagnon of the multiferroic high-field phase.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:47:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Senff", "D.", "" ], [ "Link", "P.", "" ], [ "Aliouane", "N.", "" ], [ "Argyriou", "D. N.", "" ], [ "Braden", "M.", "" ] ]
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711.2931
Francesco Knechtli
F. Knechtli, N. Irges and M. Luz
New Higgs mechanism from the lattice
7 pages, 5 figures. Presented at International Europhysics Conference on High Energy Physics (EPS-HEP2007), Manchester, England, 19-25 Jul 2007
J.Phys.Conf.Ser.110:102006,2008
10.1088/1742-6596/110/10/102006
WUB/07-10
hep-ph hep-lat
null
Spontaneous symmetry breaking has been observed in lattice simulations of five-dimensional gauge theories on an orbifold. This effect is reproduced by perturbation theory if it is modified to account for a finite cut-off. We present a comparison of lattice and analytic results for bulk gauge group SU(2).
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:51:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Knechtli", "F.", "" ], [ "Irges", "N.", "" ], [ "Luz", "M.", "" ] ]
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711.2932
Marco Castellani
M. Castellani
Galactic Globular Clusters Database: a progress report
3 pages, proceedings of "XXI Century challenges for stellar evolution" (Cefalu', Italy), eds. S. Cassisi and M. Salaris, to be published in MemSAIt, 79, 2. See http://www.mporzio.astro.it/~marco/gc/papers/ for a PDF version with encapsulated figures
null
null
null
astro-ph
null
The present status of Galactic Globular Clusters Database is briefly reviewed. The features implemented at the time writing are described, as well as plans for future improvements.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:55:37 GMT" } ]
2007-11-20T00:00:00
[ [ "Castellani", "M.", "" ] ]
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711.2933
Zsolt Szep
G. Fejos, A. Patkos, Zs. Szep
Renormalisability of the 2PI-Hartree approximation of multicomponent scalar models in the broken symmetry phase
21 pages, no figures, version accepted for publication in Nucl. Phys. A
Nucl.Phys.A803:115-135,2008
10.1016/j.nuclphysa.2008.01.028
null
hep-ph
null
Non-perturbative renormalisation of a general class of scalar field theories is performed at the Hartree level truncation of the 2PI effective action in the broken symmetry regime. Renormalised equations are explicitly constructed for the one- and two-point functions. The non-perturbative counterterms are deduced from the conditions for the cancellation of the overall and the subdivergences in the complete Hartree-Dyson-Schwinger equations, with a transparent method. The procedure proposed in the present paper is shown to be equivalent to the iterative renormalisation method of Blaizot et al., Nucl. Phys. A736 (2004) 149.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 13:57:38 GMT" }, { "version": "v2", "created": "Sun, 3 Feb 2008 22:02:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Fejos", "G.", "" ], [ "Patkos", "A.", "" ], [ "Szep", "Zs.", "" ] ]
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711.2934
Davide Fioravanti
Diego Bombardelli, Davide Fioravanti and Marco Rossi
Non-linear integral equations in {\cal {N}}=4 SYM
RAQIS '07 Prooceedings Contribution with some new results
null
null
null
hep-th
null
We survey and discuss the applications of the non-linear integral equation in the framework of the Bethe Ansatz type equations which are conjectured to give the eigenvalues of the dilatation operator in ${\cal {N}}=4$ SYM. Moreover, an original idea (different from that of \cite {FMQR}) to derive a non-linear integral equation is briefly depicted in Section 4.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:00:23 GMT" } ]
2007-11-20T00:00:00
[ [ "Bombardelli", "Diego", "" ], [ "Fioravanti", "Davide", "" ], [ "Rossi", "Marco", "" ] ]
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711.2935
Toru Goto
Toru Goto (KEK), Yasuhiro Okada (KEK, Sokendai), Tetsuo Shindou (DESY) and Minoru Tanaka (Osaka U)
Patterns of flavor signals in supersymmetric models
52 pages, 17 figures, 5 tables
Phys.Rev.D77:095010,2008
10.1103/PhysRevD.77.095010
KEK-TH-1198, DESY 07-201, OU-HET-590-2007
hep-ph
null
Quark and lepton flavor signals are studied in four supersymmetric models, namely the minimal supergravity model, the minimal supersymmetric standard model with right-handed neutrinos, SU(5) supersymmetric grand unified theory with right-handed neutrinos and the minimal supersymmetric standard model with U(2) flavor symmetry. We calculate b --> s(d) transition observables in B_d and B_s decays, taking the constraint from the B_s--B_s-bar mixing recently observed at Tevatron into account. We also calculate lepton flavor violating processes mu --> e gamma, tau --> mu gamma and tau --> e gamma for the models with right-handed neutrinos. We investigate possibilities to distinguish the flavor structure of the supersymmetry breaking sector with use of patterns of various flavor signals which are expected to be measured in experiments such as MEG, LHCb and a future Super B Factory.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:09:05 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 15:33:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Goto", "Toru", "", "KEK" ], [ "Okada", "Yasuhiro", "", "KEK, Sokendai" ], [ "Shindou", "Tetsuo", "", "DESY" ], [ "Tanaka", "Minoru", "", "Osaka U" ] ]
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711.2936
G\'abor Kupi
G\'abor Kupi
Determination of the upper and lower bound of masslimit of degenerate fermionic dark matter objects
null
Phys.Rev.D77:023001,2008
10.1103/PhysRevD.77.023001
null
astro-ph
null
We give a gravitational upper limit for the mass of static degenerate fermionic dark matter objects. The treatment we use includes fully relativistic equations for describing the static solutions of these objects. We study the influence of the annihilation of the particles on this mass limit. We give the change of its value over the age of the Universe with annihilation cross sections relevant for such fermions constituting the dark matter. Our calculations take into account the possibility of Dirac as well Majorana spinors.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:10:47 GMT" } ]
2008-12-18T00:00:00
[ [ "Kupi", "Gábor", "" ] ]
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711.2937
Marc Siegmund
Marc Siegmund, Markus Hofmann, Oleg Pankratov
Persistent current and Wigner crystallization in a one dimensional quantum ring
7 pages, 5 figures
null
null
null
cond-mat.mes-hall
null
We use Density Functional Theory to study interacting spinless electrons on a one-dimensional quantum ring in the density range where the system undergoes Wigner crystallization. The Wigner transition leads to a drastic ``collective'' electron localization due to the Wigner crystal pinning, provided a weak impurity potential is applied. To reveal this localization we examine a persistent current in a ring penetrated by a magnetic flux. Using the DFT-OEP method we calculated the current as a function of the interaction parameter r_S. We find that in the limit of vanishing impurity potential the persistent current stays constant up to a critical value of r_S^c=2.05 but shows a drastic exponential decay for larger r_S which reflects a formation of a pinned Wigner crystal. Above r_S^c the amplitude of the electron density oscillations exactly follows the (r_S-r_S^c)^{1/2} behaviour, confirming a second-order phase transition as expected in the mean-field-type OEP approximation.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:15:18 GMT" } ]
2007-11-20T00:00:00
[ [ "Siegmund", "Marc", "" ], [ "Hofmann", "Markus", "" ], [ "Pankratov", "Oleg", "" ] ]
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711.2938
Hidefumi Ohsugi
Hidefumi Ohsugi, Takayuki Hibi
Two way subtable sum problems and quadratic Groebner bases
3 pages
Proc. Amer. Math. Soc. 137 (2009), 1539-1542
10.1090/S0002-9939-08-09675-5
null
math.AC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hara, Takemura and Yoshida discuss toric ideals arising from two way subtable sum problems and shows that these toric ideals are generated by quadratic binomials if and only if the subtables are either diagonal or triangular. In the present paper, we show that if the subtables are either diagonal or triangular, then their toric ideals possess quadratic Groebner bases.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:16:36 GMT" }, { "version": "v2", "created": "Thu, 12 Jun 2008 18:12:45 GMT" } ]
2018-08-22T00:00:00
[ [ "Ohsugi", "Hidefumi", "" ], [ "Hibi", "Takayuki", "" ] ]
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711.2939
S. A. Lamzin
S. A. Lamzin, M. M. Romanova, S. A. Kravtsova
On the origin of continuum and line emission in CTTSs
9 pages, 5 figure, 1 table, to appear in the proceedings of IAU Symposium 243 "Star-Disk Interaction in Young Stars" (Grenoble, France, May/2007)
null
10.1017/S1743921307009477
null
astro-ph
null
We calculated profiles of CIV 1550, Si IV 1400, NV 1240 and OVI 1035 doublet lines using results of 3D MHD simulations of disc accretion onto young stars with dipole magnetic field. It appeared that our calculations can not reproduce profiles of these lines observed (HST/GHRS-STIS and FUSE) in CTTSs's spectra. We also found that the theory predicts much larger C IV 1550 line flux than observed (up to two orders of magnitude in some cases) and argue that the main portion of accretion energy in CTTSs is liberated outside accretion shock. We conclude that the reason of disagreement between the theory and observation is strongly non-dipole character of CTTS's magnetic field near its surface.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:18:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Lamzin", "S. A.", "" ], [ "Romanova", "M. M.", "" ], [ "Kravtsova", "S. A.", "" ] ]
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711.294
Masaaki Nakamura
Masaaki Nakamura and Lila Hirasawa
Electric transport and magnetic properties in multilayer graphene
11 pages, 11 figures
Phys. Rev. B, 77 (2008) 045429
10.1103/PhysRevB.77.045429
null
cond-mat.mes-hall cond-mat.str-el
null
We discuss electric transport and orbital magnetism of multilayer graphenes in a weak-magnetic field using the matrix decomposition technique. At zero temperature, the minimum conductivity is given by that of the monolayer system multiplied by the layer number $N$, independent of the interlayer hopping $t$. When the interlayer hopping satisfies the condition $t\gg \hbar/\tau$ with $\tau$ being collision time of impurity scattering, $[N/2]$ kinks and $[N/2]+1$ plateaux appear in the Fermi-energy (gate voltage) dependence of the conductivity and the Hall conductivity, respectively. These behaviors are interpreted as multiband effects. We also found that the Hall conductivity and the magnetic susceptibility take minimum value as a function of temperature, for certain value of the gate voltage. This behavior is explained by Fermi-energy dependence of these functions at zero temperature.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:18:31 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 02:01:10 GMT" } ]
2008-01-31T00:00:00
[ [ "Nakamura", "Masaaki", "" ], [ "Hirasawa", "Lila", "" ] ]
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711.2941
Patrick Popescu-Pampu
Patrick Popescu-Pampu
Holomorphic fillability and cohomology
This paper was withdrawn
null
null
null
math.CV math.SG
null
I have withdrawn the paper, after having incorporated it into the paper arXiv:0712.3484. In the meantime I have discovered that the main theorem proved in the paper had already been proved by Bungart.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:36:53 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 14:17:58 GMT" } ]
2011-11-10T00:00:00
[ [ "Popescu-Pampu", "Patrick", "" ] ]
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711.2942
Jen-Tsung Hsiang
Tai-Hung Wu, Jen-Tsung Hsiang, Da-Shin Lee
Boundary effects of electromagnetic vacuum fluctuations on charged particles
8 pages, presented at 8th Workshop on Quantum Field Theory Under the Influence of External Conditions (QFEXT'07), Leipzig, Germany, 16-21 Sep 2007
AIPConf.Proc.1059:175-179,2008
10.1063/1.3012273
null
hep-th
null
The effects of electromagnetic vacuum fluctuations with the boundary on charged particles is investigated. They may be observed via an electron interference experiment near the conducting plate, where boundary effects of vacuum fluctuations are found significant on coherence reduction of the electrons. The dynamics of the charge under the influence of quantized electromagnetic fields with a conducting plate is also studied. The corresponding stochastic equation of motion is derived in the semiclassical approximation, and the behavior of the charge's velocity fluctuations is discussed.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:30:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Wu", "Tai-Hung", "" ], [ "Hsiang", "Jen-Tsung", "" ], [ "Lee", "Da-Shin", "" ] ]
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711.2943
Joakim Arnlind
Joakim Arnlind
Representation theory of C-algebras for a higher order class of spheres and tori
14 pages
null
10.1063/1.2913523
null
math-ph hep-th math.MP math.RT
null
We construct C-algebras for a class of surfaces that are inverse images of certain polynomials of arbitrary degree. By using the directed graph associated to a matrix, the representation theory can be understood in terms of ``loop'' and ``string'' representations, which are closely related to the dynamics of an iterated map in the plane. As a particular class of algebras we introduce the ``Henon algebras'', for which the dynamical map is a generalized Henon map, and give an example where irreducible representations of all dimensions exist.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:31:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Arnlind", "Joakim", "" ] ]
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711.2944
Ilian Iliev
Ilian T. Iliev (1,2), Paul R. Shapiro (3), Patrick McDonald (2), Garrelt Mellema (4), Ue-Li Pen (2) ((1) ITP, Zurich, (2) CITA, (3) UT Austin, (4) Stockholm)
Effect of the intergalactic environment on the observability of Ly-alpha emitters during reionization
21 pages, most figures in color, MNRAS, in press, replaced to match the published version
null
10.1111/j.1365-2966.2008.13879.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Observations of high-redshift Ly-alpha sources are a major tool for studying the high-redshift Universe. We discuss the effect of the reionizing intergalactic medium on the observability of Ly-alpha sources based on large simulations of early structure formation with radiative transfer. This takes into account self-consistently the reionization history, density, velocity and ionization structures and nonlinear source clustering. We find that all fields are highly anisotropic and as a consequence there are very large variations in opacity among the different lines-of-sight. The velocity effects, from both infall and source peculiar velocity are most important for the luminous sources, affecting the line profile and depressing the bright end of the luminosity function. The line profiles are generally asymmetric and the line centers of the luminous sources are always absorbed due to the high density of the local IGM. For both luminous and average sources the damping wing effects are of similar magnitude and remain significant until fairly late. The ionizing flux in the ionized patch surrounding a high density peak is generally strongly dominated, particularly at late times, by the cluster of faint sources, rather than the central massive galaxy. The IGM absorption does not change appreciably the correlation function of sources at high redshift. Our derived luminosity function assuming constant mass-to-light ratio provides an excellent match to the shape of the observed luminosity function at z=6.6 with faint-end slope of alpha=-1.5. The resulting mass-to-light ratio implies that the majority of sources responsible for reionization are too faint to be observed by the current surveys. (abridged)
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:35:52 GMT" }, { "version": "v2", "created": "Sun, 28 Sep 2008 20:10:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Iliev", "Ilian T.", "" ], [ "Shapiro", "Paul R.", "" ], [ "McDonald", "Patrick", "" ], [ "Mellema", "Garrelt", "" ], [ "Pen", "Ue-Li", "" ] ]
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711.2945
Vadim N. Biktashev
V. N.Biktashev, A. Arutunyan, N. A. Sarvazyan
Generation and escape of local waves from the boundary of uncoupled cardiac tissue
28 pages, 10 figures, submitted to Biophysical Journal
null
10.1529/biophysj.107.117630
null
q-bio.TO q-bio.CB
null
We aim to understand the formation of abnormal waves of activity from myocardial regions with diminished cell-to-cell coupling. In route to this goal, we studied the behavior of a heterogeneous myocyte network in which a sharp coupling gradient was placed under conditions of increasing network automaticity. Experiments were conducted in monolayers of neonatal rat cardiomyocytes using heptanol and isoproterenol as means of altering cell-to-cell coupling and automaticity respectively. Experimental findings were explained and expanded using a modified Beeler-Reuter numerical model. The data suggests that the combination of a heterogeneous substrate, a gradient of coupling and an increase in oscillatory activity of individual cells creates a rich set of behaviors associated with self-generated spiral waves and ectopic sources. Spiral waves feature a flattened shape and a pin-unpin drift type of tip motion. These intercellular waves are action-potential based and can be visualized with either voltage or calcium transient measurements. A source/load mismatch on the interface between the boundary and well-coupled layers can lock wavefronts emanating from both ectopic sources and rotating waves within the inner layers of the coupling gradient. A numerical approach allowed us to explore how: i) the spatial distribution of cells, ii) the amplitude and dispersion of cell automaticity, iii) and the speed at which the coupling gradient moves in space, affects wave behavior, including its escape into well-coupled tissue.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 08:06:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Biktashev", "V. N.", "" ], [ "Arutunyan", "A.", "" ], [ "Sarvazyan", "N. A.", "" ] ]
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711.2946
Monica Orienti
M. Orienti (1,2,3), D. Dallacasa (2,3), ((1) IAC, (2) Dipartimento di Astronomia, Bologna, (3) IRA-INAF, Bologna)
Radio spectrum evolution and magnetic field in extreme GPS radio sources. The case of RXJ1459+3337
8 pages, 4 figures; accepted for publication in A&A
null
10.1051/0004-6361:20078098
null
astro-ph
null
Aims: The knowledge of the properties of the youngest radio sources is very important in order to trace the earliest phase of the evolution of the radio emission. RXJ1459+3337, with its high turnover frequency (~25 GHz) provides a unique opportunity to study this class of extreme objects. Methods: High-sensitivity multi-frequency VLA observations have been carried out to measure the flux-density with high accuracy, while multi-frequency VLBA observations were performed, aimed at determining the pc-scale structure. Archival ROSAT data have been used to infer the X-ray luminosity. Results: The comparison between our new VLA data and those available in the literature shows a steady increment of the flux-density in the optically-thick part of the spectrum and a decrement of the turnover frequency. In the optically-thin regime, the source flux density has already started to decrease. Such a variability can be explained in terms of an adiabatically-expanding homogeneous radio component. The frequency range spanned by our VLBA observations, together with the resolution achieved, allows us to determine the source size and the turnover frequency, and then to derive the magnetic field directly from these observable quantities. The value obtained in this way is in good agreement with that computed assuming equipartition condition. A similar value is also obtained by comparing the radio and X-ray luminosities.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:44:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Orienti", "M.", "" ], [ "Dallacasa", "D.", "" ] ]
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711.2947
Gerhard Huber
G. Huber, T. Deuschle, W. Schnitzler, R. Reichle, K. Singer and F. Schmidt-Kaler
Transport of ions in a segmented linear Paul trap in printed-circuit-board technology
16 pages
null
null
null
quant-ph
null
We describe the construction and operation of a segmented linear Paul trap, fabricated in printed-circuit-board technology with an electrode segment width of 500 microns. We prove the applicability of this technology to reliable ion trapping and report the observation of Doppler cooled ion crystals of Ca-40 with this kind of traps. Measured trap frequencies agree with numerical simulations at the level of a few percent from which we infer a high fabrication accuracy of the segmented trap. To demonstrate its usefulness and versatility for trapped ion experiments we study the fast transport of a single ion. Our experimental results show a success rate of 99.0(1)% for a transport distance of 2x2mm in a round-trip time of T=20us, which corresponds to 4 axial oscillations only. We theoretically and experimentally investigate the excitation of oscillations caused by fast ion transports with error-function voltage ramps: For a slightly slower transport (a round-trip shuttle within T=30us) we observe non-adiabatic motional excitation of 0.89(15)meV.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:51:55 GMT" } ]
2007-11-20T00:00:00
[ [ "Huber", "G.", "" ], [ "Deuschle", "T.", "" ], [ "Schnitzler", "W.", "" ], [ "Reichle", "R.", "" ], [ "Singer", "K.", "" ], [ "Schmidt-Kaler", "F.", "" ] ]
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711.2948
Yunchang Shin
Yunchang Shin, W. Mike Snow, Christopher M. Lavelle, David V. Baxter, Xin Tong, Haiyang Yan, Mark Leuschner
The Neutron Energy Spectrum Study from the Phase II Solid Methane Moderator at the LENS Neutron Source
20 pages, 12 figures
null
null
null
nucl-ex
null
Neutron energy spectrum measurements from a solid methane moderator were performed at the Low Energy Neutron Source (LENS) at Indiana University Cyclotron Facility (IUCF) to verify our neutron scattering model of solid methane. The time-of-flight method was used to measure the energy spectrum of the moderator in the energy range of 0.1$meV\sim$ 1$eV$. Neutrons were counted with a high efficiency $^{3}{He}$ detector. The solid methane moderator was operated in phase II temperature and the energy spectra were measured at the temperatures of 20K and 4K. We have also tested our newly-developed scattering kernels for phase II solid methane by calculating the neutron spectral intensity expected from the methane moderator at the LENS neutron source using MCNP (Monte Carlo N-particle Transport Code). Within the expected accuracy of our approximate approach, our model predicts both the neutron spectral intensity and the optimal thickness of the moderator at both temperatures. The predictions are compared to the measured energy spectra. The simulations agree with the measurement data at both temperatures.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:54:22 GMT" } ]
2007-11-20T00:00:00
[ [ "Shin", "Yunchang", "" ], [ "Snow", "W. Mike", "" ], [ "Lavelle", "Christopher M.", "" ], [ "Baxter", "David V.", "" ], [ "Tong", "Xin", "" ], [ "Yan", "Haiyang", "" ], [ "Leuschner", "Mark", "" ] ]
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711.2949
Marco Laumanns
Marco Laumanns
Stochastic convergence of random search to fixed size Pareto set approximations
Corrected typo in Definition 4
null
null
null
math.OC
null
This paper presents the first convergence result for random search algorithms to a subset of the Pareto set of given maximum size k with bounds on the approximation quality. The core of the algorithm is a new selection criterion based on a hypothetical multilevel grid on the objective space. It is shown that, when using this criterion for accepting new search points, the sequence of solution archives converges with probability one to a subset of the Pareto set that epsilon-dominates the entire Pareto set. The obtained approximation quality epsilon is equal to the size of the grid cells on the finest level of resolution that allows an approximation with at most k points within the family of grids considered. While the convergence result is of general theoretical interest, the archiving algorithm might be of high practical value for any type iterative multiobjective optimization method, such as evolutionary algorithms or other metaheuristics, which all rely on the usage of a finite on-line memory to store the best solutions found so far as the current approximation of the Pareto set.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 14:58:25 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 11:32:54 GMT" } ]
2011-11-10T00:00:00
[ [ "Laumanns", "Marco", "" ] ]
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711.295
Thomas Schwetz
Patrick Huber, Mauro Mezzetto, Thomas Schwetz
On the impact of systematical uncertainties for the CP violation measurement in superbeam experiments
30 pages, 10 figures, version accepted for publication in JHEP
JHEP 0803:021,2008
10.1088/1126-6708/2008/03/021
CERN-PH-TH/2007-227, VPI-IPNAS-07-09
hep-ph hep-ex
null
Superbeam experiments can, in principle, achieve impressive sensitivities for CP violation in neutrino oscillations for large $\theta_{13}$. We study how those sensitivities depend on assumptions about systematical uncertainties. We focus on the second phase of T2K, the so-called T2HK experiment, and we explicitly include a near detector in the analysis. Our main result is that even an idealised near detector cannot remove the dependence on systematical uncertainties completely. Thus additional information is required. We identify certain combinations of uncertainties, which are the key to improve the sensitivity to CP violation, for example the ratio of electron to muon neutrino cross sections and efficiencies. For uncertainties on this ratio larger than 2%, T2HK is systematics dominated. We briefly discuss how our results apply to a possible two far detector configuration, called T2KK. We do not find a significant advantage with respect to the reduction of systematical errors for the measurement of CP violation for this setup.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:00:08 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 10:14:45 GMT" } ]
2009-01-06T00:00:00
[ [ "Huber", "Patrick", "" ], [ "Mezzetto", "Mauro", "" ], [ "Schwetz", "Thomas", "" ] ]
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711.2951
Alexander Milner
Alexander A Milner, Kaiyin Zhang and Yehiam Prior (Weizmann Institute of Science)
Floating Tip Nanolithography
Version 2: new data added; PDF, 12 pages, 12 figures
null
10.1021/nl801203c
null
cond-mat.mtrl-sci
null
We demonstrate noncontact, high quality surface modification with spatial resolution of ~20 nm. The nanowriting is based on the interaction between the surface and the tip of an Atomic force microscope illuminated by a focused laser beam and hovering 1-4 nanometers above the surface without touching it. The floating tip nanowriting is compared to mechanical surface scratching, and is found to be much more reproducible, and of higher quality. In an Apertureless Scanning Near Field Optical Microscope geometry the tip is illuminated by a focused femtosecond laser, leading to two different, clearly identifiable mechanisms for removing material from the surface: when heated by the laser beam, the hot-tip thermally patterns the surface of low melting temperature soft materials, and when focused right at the apex of the sharp tip, the enhanced electric field of the laser beam causes ablation in high melting temperature metal films.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:14:07 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 08:18:03 GMT" } ]
2015-05-13T00:00:00
[ [ "Milner", "Alexander A", "", "Weizmann Institute\n of Science" ], [ "Zhang", "Kaiyin", "", "Weizmann Institute\n of Science" ], [ "Prior", "Yehiam", "", "Weizmann Institute\n of Science" ] ]
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711.2952
Petr Zasche
Zasche Petr, Zejda Miloslav, Brat Lubos
Eclipsing Binaries with Possible Light-Time Effect
4 pages, 1 figure, 2 tables, conference proceedings
Astrophys.Space Sci.304:177,2006
10.1007/s10509-006-9103-2
null
astro-ph
null
The period changes of six eclipsing binaries have been studied with focus on the light-time effect. With the least squares method we also calculated parameters of such an effect and properties of the unresolved body in these systems. With these results we discussed the probability of presence of such bodies in the systems with respect to possible confirmation by another method. In two systems we also suggested the hypothesis of fourth body or magnetic activity for explanation of the "second-order variability" after subtraction of the light-time effect of the third body.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:19:36 GMT" } ]
2009-06-25T00:00:00
[ [ "Petr", "Zasche", "" ], [ "Miloslav", "Zejda", "" ], [ "Lubos", "Brat", "" ] ]
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711.2953
Junegone Chay
Junegone Chay, Hsiang-nan Li and Satoshi Mishima
Possible complex annihilation and B -> K pi direct CP asymmetry
8 pages, 1 figure, added references
Phys.Rev.D78:034037,2008
10.1103/PhysRevD.78.034037
MIT-CTP-3902
hep-ph
null
We point out that a sizable strong phase could be generated from the penguin annihilation in the soft-collinear effective theory for B meson decays. Keeping a small scale suppressed by O(Lambda/m_b), Lambda being a hadronic scale and m_b the b quark mass, in the denominators of internal particle propagators without expansion, the resultant strong phase can accommodate the data of the B^0 -> K^-+ pi^+- direct CP asymmetry. Our study reconciles the opposite conclusions on the real or complex penguin annihilation amplitude drawn in the soft-collinear effective theory and in the perturbative QCD approach based on k_T factorization theorem.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:23:27 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 14:19:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Chay", "Junegone", "" ], [ "Li", "Hsiang-nan", "" ], [ "Mishima", "Satoshi", "" ] ]
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711.2954
Takashi Hamazaki
Takashi Hamazaki
Long wavelength limit of evolution of cosmological perturbations in the universe where scalar fields and fluids coexist
Page:46
Nucl.Phys.B791:20-59,2008
10.1016/j.nuclphysb.2007.09.028
null
astro-ph
null
We present the LWL formula which represents the long wavelengh limit of the solutions of evolution equations of cosmological perturbations in terms of the exactly homogeneous solutions in the most general case where multiple scalar fields and multiple perfect fluids coexist. We find the conserved quantity which has origin in the adiabatic decaying mode, and by regarding this quantity as the source term we determine the correction term which corrects the discrepancy between the exactly homogeneous perturbations and the $k \to 0$ limit of the evolutions of cosmological perturbations. This LWL formula is useful for investigating the evolutions of cosmological perturbations in the early stage of our universe such as reheating after inflation and the curvaton decay in the curvaton scenario. When we extract the long wavelength limits of evolutions of cosmological perturbations from the exactly homogeneos perturbations by the LWL formula, it is more convenient to describe the corresponding exactly homogeneous system with not the cosmological time but the scale factor as the evolution parameter. By applying the LWL formula to the reheating model and the curvaton model with multiple scalar fields and multiple radiation fluids, we obtain the S formula representing the final amplitude of the Bardeen parameter in terms of the initial adiabatic and isocurvature perturbations Keywords:cosmological perturbations,long wavelength limit,reheating,curvaton PACS number(s):98.80.Cq
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:24:32 GMT" } ]
2009-06-23T00:00:00
[ [ "Hamazaki", "Takashi", "" ] ]
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711.2955
Petr Zasche
P.Zasche, M. Wolf, P. Svoboda
The BVRI Light Curves And Period Analysis Of The Beta Lyrae System XX Leonis
4 pages, 2 figures, 2 tables, conference proceedings
IAU Symp.240:127,2007
null
null
astro-ph
null
The contact eclipsing binary system XX Leonis (P = 0.97 days, sp A8) has been analysed using the PHOEBE programme, based on the Wilson Devinney code. The BVRI light curves were obtained during spring 2006 using the 20-cm telescope and ST-7 CCD detector. The effective temperature of the primary component determined from the photometric analysis is T=(7889+/-61)K, the inclination of the orbit is i=(89.98+/-2.45)deg and the photometric mass ratio q=(0.41+/-0.01). Also the third body hypothesis was suggested, based on the period analysis using 57 minimum times and resulting the period of the third body p3= (52.96+/-0.01)yr, amplitude A=(0.057+/-0.029)d and eccentricity e=(0.79+/-0.08) which gives the minimum mass m3,min=(3.6+/-0.8)M_sun.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:29:22 GMT" } ]
2009-06-25T00:00:00
[ [ "Zasche", "P.", "" ], [ "Wolf", "M.", "" ], [ "Svoboda", "P.", "" ] ]
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711.2956
Ronny Thomas
R. Thomas, T. Hilger, B. Kampfer
Role of Four-Quark Condensates in QCD Sum Rules
Invited talk at International School of Nuclear Physics, 29th Course, Quarks in Hadrons and Nuclei, Erice, Sicily, 16 - 24 Sep 2007
Prog.Part.Nucl.Phys.61:297-303,2008
10.1016/j.ppnp.2007.12.028
null
hep-ph nucl-th
null
The QCD sum rule approach to the in-medium behavior of hadrons is discussed for omega meson, nucleon and D meson. Emphasis is devoted to the impact of four-quark condensates and to order parameters of spontaneous symmetry breaking.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:33:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Thomas", "R.", "" ], [ "Hilger", "T.", "" ], [ "Kampfer", "B.", "" ] ]
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711.2957
Martine Pithioux
Didier Mokoko (LABM), Martine Pithioux (LABM), Patrick Chabrand (LABM)
Temporal evolution of mechanical properties of skeletal tissue regeneration in rabbits. An experimental study
7
Medical & biological engineering & computing 45, 10 (2007) 989-995
null
null
physics.med-ph
null
Various mathematical models represent the effects of local mechanical environment on the regulation of skeletal regeneration. Their relevance relies on an accurate description of the evolving mechanical properties of the regenerating tissue. The object of this study was to develop an experimental model which made it possible to characterize the temporal evolution of the structural and mechanical properties during unloaded enchondral osteogenesis in the New Zealand rabbit, a standard animal model for studies of osteogenesis and chondrogenesis. A 25mm segment of tibial diaphysis was removed sub-periosteally from rabbits. The defect was repaired by the preserved periosteum. An external fixator was applied to prevent mechanical loading during osteogenesis. The regenerated skeletal tissues were studied by CT scan, histology and mechanical tests. The traction tests between 7 to 21 days post-surgery were done on formaldehyde-fixated tissue allowing to obtain force/displacement curves. The viscoelastic properties of the regenerating skeletal tissues were visualized throughout the repair process.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:35:02 GMT" } ]
2007-11-20T00:00:00
[ [ "Mokoko", "Didier", "", "LABM" ], [ "Pithioux", "Martine", "", "LABM" ], [ "Chabrand", "Patrick", "", "LABM" ] ]
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711.2958
Panayotis Boumis
Ioanna Leonidaki (1,3), Andreas Zezas (2), Panayotis Boumis (1) ((1) Institute of Astronomy and Astrophysics, National Observatory of Athens, Athens, Greece, (2) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA, (3) Department of Physics, University of Patras, Rio-Patras, Greece)
X-ray supernova remnants in nearby galaxies
2 pages, 4 figures, Contributed paper to "X-rays from nearby galaxies", ESAC, Madrid (Spain), September 2007, in press
null
null
null
astro-ph
null
We present the initial results from a study of the SNR population in a sample of six nearby galaxies (NGC 2403, NGC 4214, NGC 4449, NGC 5204, NGC 3077, NGC 4395) based on Chandra archival data. We discuss the analysis of the Chandra data and we present candidate SNR sources selected on the basis of their X-ray colours. We also present deep [S II] 6716 & 6731 A and Halpha line images for most of the galaxies in our sample, which provide optically selected samples of SNRs. Comparison of the X-ray results with the complementary optical observations provides a more complete picture of the SNR population and allows us to address their X-ray emission. Our preliminary analysis of the [S II]/Halpha images show that 48 X-ray sources are typically associated with Halpha sources, 7 of which are SNR candidates based on their [S II]/Halpha ratio and one is an already known radio SNR.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:40:00 GMT" } ]
2007-11-20T00:00:00
[ [ "Leonidaki", "Ioanna", "" ], [ "Zezas", "Andreas", "" ], [ "Boumis", "Panayotis", "" ] ]
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711.2959
Simon Goodwin
Simon M. Goodwin, Gerhard Roehrle
On conjugacy of unipotent elements in finite groups of Lie type
9 pages, Minor changes and corrections
null
null
null
math.GR math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\bfG$ be a connected reductive algebraic group defined over $\F_q$, where $q$ is a power of a prime $p$ that is good for $\bfG$. Let $F$ be the Frobenius morphism associated with the $\FF_q$-structure on $\bfG$ and set $G = \bfG^F$, the fixed point subgroup of $F$. Let $\bfP$ be an $F$-stable parabolic subgroup of $\bfG$ and let $\bfU$ be the unipotent radical of $\bfP$; set $P = \bfP^F$ and $U = \bfU^F$. Let $G_\uni$ be the set of unipotent elements in $G$. In this note we show that the number of conjugacy classes of $U$ in $G_\uni$ is given by a polynomial in $q$ with integer coefficients.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:47:20 GMT" }, { "version": "v2", "created": "Fri, 11 Jul 2008 14:17:13 GMT" } ]
2008-07-11T00:00:00
[ [ "Goodwin", "Simon M.", "" ], [ "Roehrle", "Gerhard", "" ] ]
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711.296
G. Papini
G. Papini, G. Scarpetta, A. Feoli, G. Lambiase
Optics of spin-1 particles from gravity-induced phases
16 pages, 2 figures
Int.J.Mod.Phys.D18:485-499,2009
10.1142/S0218271809014595
null
gr-qc
null
The Maxwell and Maxwell-de Rham equations can be solved exactly to first order in an external gravitational field. The gravitational background induces phases in the wave functions of spin-1 particles. These phases yield the optics of the particles without requiring any thin lens approximation.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:48:11 GMT" } ]
2009-05-12T00:00:00
[ [ "Papini", "G.", "" ], [ "Scarpetta", "G.", "" ], [ "Feoli", "A.", "" ], [ "Lambiase", "G.", "" ] ]
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711.2961
Felix Brandt
Felix Brandt, Felix Fischer, Paul Harrenstein
Recognizing Members of the Tournament Equilibrium Set is NP-hard
9 pages, 3 figures
Social Choice and Welfare 34(4), 2009
10.1007/s00355-009-0419-z
null
cs.CC cs.GT cs.MA
null
A recurring theme in the mathematical social sciences is how to select the "most desirable" elements given a binary dominance relation on a set of alternatives. Schwartz's tournament equilibrium set (TEQ) ranks among the most intriguing, but also among the most enigmatic, tournament solutions that have been proposed so far in this context. Due to its unwieldy recursive definition, little is known about TEQ. In particular, its monotonicity remains an open problem up to date. Yet, if TEQ were to satisfy monotonicity, it would be a very attractive tournament solution concept refining both the Banks set and Dutta's minimal covering set. We show that the problem of deciding whether a given alternative is contained in TEQ is NP-hard.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:48:46 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 13:47:48 GMT" } ]
2015-02-06T00:00:00
[ [ "Brandt", "Felix", "" ], [ "Fischer", "Felix", "" ], [ "Harrenstein", "Paul", "" ] ]
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711.2962
Ken Ebisawa
Ken Ebisawa, Shigeo Yamauchi, Yasuo Tanaka, Katsuji Koyama, Yuichiro Ezoe, Aya Bamba, Motohide Kokubun, Yoshiaki Hyodo, Masahiro Tsujimoto, and Hiromitsu Takahashi
Spectral Study of the Galactic Ridge X-ray Emission with Suzaku
Accepted to PASJ second Suzaku Special issue
null
10.1093/pasj/60.sp1.S223
null
astro-ph
null
We have observed a typical Galactic plane field at (l,b) = (28.46d, -0.20d) with Suzaku for 100 ksec to carry out a precise spectral study of the Galactic Ridge X-ray Emission (GRXE). The field is known to be devoid of X-ray point sources brighter than ~2 x 10^{-13} ergs s^{-1} cm^{-2} (2--10 keV), and already deeply observed with Chandra. Thanks to the low and stable background and high spectral resolution of Suzaku, we were able to resolve, for the first time, three narrow iron K-emission lines from low-ionized (6.41 keV), helium-like (6.67 keV), and hydrogenic ions (7.00 keV) in the GRXE spectrum. These line features constrain the GRXE emission mechanisms: The cosmic-ray ion charge exchange model or the non-equilibrium ionization plasma model are unlikely, since they require either broad emission lines or lines at intermediate ionization states. Collisional ionization equilibrium plasma is the likely origin for the 6.67 keV and 7.00 keV lines, while origin of the 6.41 keV line, which is due to fluorescence from cold material, is not elucidated. Low non-X-ray background and little stray-light contamination of Suzaku allowed us to precisely measure the absolute X-ray surface brightness in the direction of the Galactic plane. Excluding the point sources brighter than ~2 x 10^{-13} ergs s^{-1} cm^{-2} (2--10 keV), the total surface brightness on the Galactic plane is ~6.1 x 10^{-11} ergs s^{-1} cm^{-2} deg^{-2} (2--10 keV), including the contribution of the cosmic X-ray background that is estimated to be ~1.3x 10^{-11} ergs s^{-1} cm^{-2} deg^{-2}.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:48:57 GMT" } ]
2017-01-18T00:00:00
[ [ "Ebisawa", "Ken", "" ], [ "Yamauchi", "Shigeo", "" ], [ "Tanaka", "Yasuo", "" ], [ "Koyama", "Katsuji", "" ], [ "Ezoe", "Yuichiro", "" ], [ "Bamba", "Aya", "" ], [ "Kokubun", "Motohide", "" ], [ "Hyodo", "Yoshiaki", "" ], [ "Tsujimoto", "Masahiro", "" ], [ "Takahashi", "Hiromitsu", "" ] ]
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711.2963
Koos Gubbels
K. B. Gubbels and H. T. C. Stoof
Renormalization Group Theory for the Imbalanced Fermi Gas
Replaced with published version
Phys. Rev. Lett. 100, 140407 (2008)
10.1103/PhysRevLett.100.140407
null
cond-mat.stat-mech cond-mat.supr-con
null
We formulate a wilsonian renormalization group theory for the imbalanced Fermi gas. The theory is able to recover quantitatively well-established results in both the weak-coupling and the strong-coupling (unitarity) limit. We determine for the latter case the line of second-order phase transitions of the imbalanced Fermi gas and in particular the location of the tricritical point. We obtain good agreement with the recent experiments of Y. Shin {\it et al}. [Nature {\bf 451}, 689 (2008)].
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:49:31 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 16:40:40 GMT" }, { "version": "v3", "created": "Thu, 20 Dec 2007 18:24:36 GMT" }, { "version": "v4", "created": "Wed, 30 Apr 2008 15:27:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Gubbels", "K. B.", "" ], [ "Stoof", "H. T. C.", "" ] ]
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711.2964
Yossi Weinstein
Yuval Elias, Jos\'e M. Fernandez, Tal Mor and Yossi Weinstein
Optimal Algorithmic Cooling of Spins
20 pages, 5 figures
Lecture Notes in Comput. Sci. (LNCS), vol 4618, pp. 2-26, Unconvetional Computation, Springer, 2007
10.1007/978-3-540-73554-0
null
quant-ph
null
Algorithmic Cooling (AC) of Spins is potentially the first near-future application of quantum computing devices. Straightforward quantum algorithms combined with novel entropy manipulations can result in a method to improve the identification of molecules. We introduce here several new exhaustive cooling algorithms, such as the Tribonacci and k-bonacci algorithms. In particular, we present the ``all-bonacci'' algorithm, which appears to reach the maximal degree of cooling obtainable by the optimal AC approach.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:49:58 GMT" } ]
2007-11-20T00:00:00
[ [ "Elias", "Yuval", "" ], [ "Fernandez", "José M.", "" ], [ "Mor", "Tal", "" ], [ "Weinstein", "Yossi", "" ] ]
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711.2965
Stefan Waldmann
Martin Bordemann, Nikolai Neumaier, Stefan Waldmann, Stefan Weiss
Deformation Quantization of Surjective Submersions and Principal Fibre Bundles
32 pages, typos corrected
null
null
null
math.QA math-ph math.MP
null
In this paper we establish a notion of deformation quantization of a surjective submersion which is specialized further to the case of a principal fibre bundle: the functions on the total space are deformed into a right module for the star product algebra of the functions on the base manifold. In case of a principal fibre bundle we require in addition invariance under the principal action. We prove existence and uniqueness of such deformations. The commutant within all differential operators on the total space is computed and gives a deformation of the algebra of vertical differential operators. Applications to noncommutative gauge field theories and phase space reduction of star products are discussed.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 15:51:23 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 10:52:53 GMT" } ]
2007-12-20T00:00:00
[ [ "Bordemann", "Martin", "" ], [ "Neumaier", "Nikolai", "" ], [ "Waldmann", "Stefan", "" ], [ "Weiss", "Stefan", "" ] ]
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711.2966
Clare Burrage
C. Burrage
Supernova Brightening from Chameleon-Photon Mixing
17 pages, 3 figures
Phys.Rev.D77:043009,2008
10.1103/PhysRevD.77.043009
null
astro-ph hep-ph
null
Measurements of standard candles and measurements of standard rulers give an inconsistent picture of the history of the universe. This discrepancy can be explained if photon number is not conserved as computations of the luminosity distance must be modified. I show that photon number is not conserved when photons mix with chameleons in the presence of a magnetic field. The strong magnetic fields in a supernova mean that the probability of a photon converting into a chameleon in the interior of the supernova is high, this results in a large flux of chameleons at the surface of the supernova. Chameleons and photons also mix as a result of the intergalactic magnetic field. These two effects combined cause the image of the supernova to be brightened resulting in a model which fits both observations of standard candles and observations of standard rulers.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:11:18 GMT" } ]
2008-12-18T00:00:00
[ [ "Burrage", "C.", "" ] ]
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711.2967
Eulogio Oset
E. Oset, M. D\"oring, D. Strottman, D. Jido, M. Napsuciale, K. Sasaki, C. A. Vaquera-Araujo, M. Kaskulov, E. Hernandez, H. Nagahiro, S. Hirenzaki
Photo- and Electron-Production of Mesons on Nucleons and Nuclei
Lecture at the "International School of Nuclear Physics", 29th Course Quarks in Hadrons and Nuclei, Erice, Italy, September 2007. Note added in Proofs concerning the mixed events technique and other comments on omega production
Prog.Part.Nucl.Phys.61:260-275,2008
10.1016/j.ppnp.2007.12.024
FTUV-19-1107, IFIC-19-1107
nucl-th
null
In these lectures I will show some results obtained with the chiral unitary approach applied to the photo and electroproduction of mesons. The results for photoproduction of $\eta \pi^0 p$ and $K^0 \pi^0 \Sigma^+$, together with related reactions will be shown, having with common denominator the excitation of the $\Delta(1700)$ resonance which is one of those dynamically generated in the chiral unitary approach. Then I will show results obtained for the $e^+ e^- \to \phi f_0(980)$ reaction which reproduce the bulk of the data except for a pronounced peak, giving support to a new mesonic resonance, X(2175). Results will also be shown for the electromagnetic form factors of the $N^*(1535)$ resonance, also dynamically generated in this approach. Finally, I will show some results on the photoproduction of the $\omega$ in nuclei, showing that present experimental results claiming a shift of the $\omega$ mass in the medium are tied to a particular choice of background and are not conclusive. One the other hand, the same experimental results show unambiguously a huge increase of the $\omega$ width in the nuclear medium.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:48:28 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 09:04:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Oset", "E.", "" ], [ "Döring", "M.", "" ], [ "Strottman", "D.", "" ], [ "Jido", "D.", "" ], [ "Napsuciale", "M.", "" ], [ "Sasaki", "K.", "" ], [ "Vaquera-Araujo", "C. A.", "" ], [ "Kaskulov", "M.", "" ], [ "Hernandez", "E.", "" ], [ "Nagahiro", "H.", "" ], [ "Hirenzaki", "S.", "" ] ]
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711.2968
Claudio Cazorla
C. Cazorla and J. Boronat
Zero-temperature equation of state of solid 4He at low and high pressures
29 pages, 9 figures. To be published in Journal of Physics: Condensed Matter
null
10.1088/0953-8984/20/01/015223
null
cond-mat.other cond-mat.mtrl-sci
null
We study the zero-temperature equation of state (EOS) of solid 4He in the hexagonal closed packet (hcp) phase over the 0-57 GPa pressure range by means of the Diffusion Monte Carlo (DMC) method and the semi-empirical Aziz pair potential HFD-B(HE). In the low pressure regime (P ~ 0-1 GPa) we assess excellent agreement with experiments and we give an accurate description of the atomic kinetic energy, Lindemann ratio and Debye temperature over a wide range of molar volumes (22-6 cm^{3}/mol). However, on moving to higher pressures our calculated P-V curve presents an increasingly steeper slope which ultimately provides differences within ~40 % with respect to measurements. In order to account for many-body interactions arising in the crystal with compression which are not reproduced by our model, we perform additional electronic density-functional theory (DFT) calculations for correcting the computed DMC energies in a perturbative way. We explore both generalized gradient and local density approximations (GGA and LDA, respectively) for the electronic exchange-correlation potential. By proceeding in this manner, we show that discrepancies with respect to high pressure data are reduced to 5-10 % with few computational extra cost. Further comparison between our calculated EOSs and ab initio curves deduced for the perfect crystal and corrected for the zero-point motion of the atoms enforces the reliability of our approach.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:05:15 GMT" } ]
2015-05-13T00:00:00
[ [ "Cazorla", "C.", "" ], [ "Boronat", "J.", "" ] ]
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711.2969
Ara Avetissian Karapet
A. K. Avetissian
Cosmological Bang within Matter Era. Is the Generation of Galactic-Scale Mass Possible?
10 pages, 2 figures, revtex4 (Int. Conf. Nuclear Astrophysics Beyond the First 50 Years, 2007, Caltech, Pasadena, USA)
null
null
null
astro-ph
null
A heuristic hypothesis about domination of Bose-Einstein statistics in the early Universe is suggested. The possibility of Bose-Einstein condensation (BEC) of primordial baryon-antibaryon pairs is considered. In accordance with this postulation enormous masses in the order of galactic mass may be accumulated within the cosmic scales. At the certain threshold value of the matter density the structural bosons decay into fermions and the sharp breakdown of quantum-mechanical symmetry of the particles wave functions occurs. Then, due to the Pauli principle of exclusion a large-scale phase transition occurs because of enormous pressure jump of the matter. This phenomenon might cause Cosmological Bang at the beginning stage of the Matter Era. As a mechanism of accumulation of galactic mass much larger than the configuration with structural bosons, a hypothetical BEC of elementary bosons (gauge bosons $W^{\pm}$ and $Z^{0})$ is discussed as well.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:06:49 GMT" } ]
2007-11-20T00:00:00
[ [ "Avetissian", "A. K.", "" ] ]
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711.297
Gelu Popescu
Gelu Popescu
Free holomorphic functions and interpolation
20 pages
Math. Ann. 342 (2008), 1-30
null
null
math.FA math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we obtain a noncommutative multivariable analogue of the classical Nevanlinna-Pick interpolation problem for analytic functions with positive real parts on the open unit disc. As consequences, we deduce some results concerning operator-valued analytic interpolation on the unit ball on C^n.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:33:46 GMT" }, { "version": "v2", "created": "Wed, 4 Feb 2009 16:42:00 GMT" } ]
2009-02-04T00:00:00
[ [ "Popescu", "Gelu", "" ] ]
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711.2971
Annie Bouyer
Sylvain Kubicki (MAP / CRAI), Annie Guerri\'ero (MAP / CRAI), Damien Hanser (MAP / CRAI), Gilles Halin (MAP / CRAI)
IT services design to support coordination practices in the Luxembourguish AEC sector
null
null
null
null
cs.HC
null
In the Architecture Engineering and Construction sector (AEC) cooperation between actors is essential for project success. The configuration of actors' organization takes different forms like the associated coordination mechanisms. Our approach consists in analyzing these coordination mechanisms through the identification of the "base practices" realized by the actors of a construction project to cooperate. We also try with practitioners to highlight the "best practices" of cooperation. Then we suggest here two prototypes of IT services aiming to demonstrate the value added of IT to support cooperation. These prototype tools allow us to sensitize the actors through terrain experiments and then to bring inch by inch the Luxembourgish AEC sector towards electronic cooperation.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:36:02 GMT" } ]
2007-11-20T00:00:00
[ [ "Kubicki", "Sylvain", "", "MAP / CRAI" ], [ "Guerriéro", "Annie", "", "MAP / CRAI" ], [ "Hanser", "Damien", "", "MAP / CRAI" ], [ "Halin", "Gilles", "", "MAP / CRAI" ] ]
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711.2972
Jorge Fiscina
Jorge E. Fiscina and Christian Wagner
Wet Sand flows better than dry sand
5 pages and 5 figures
null
null
null
cond-mat.stat-mech cond-mat.soft
null
We investigated the yield stress and the apparent viscosity of sand with and without small amounts of liquid. By pushing the sand through a tube with an enforced Poiseuille like profile we minimize the effect of avalanches and shear localization. We find that the system starts to flow when a critical shear of the order of one particle diameter is exceeded. In contrast to common believe, we observe that the resistance against the flow of wet sand is much smaller than that of dry sand. For the dissipative flow we propose a non-equilibrium state equation for granular fluids.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:38:34 GMT" } ]
2007-11-28T00:00:00
[ [ "Fiscina", "Jorge E.", "" ], [ "Wagner", "Christian", "" ] ]
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711.2973
Ignazio Licata
Ignazio Licata
Emergence and Computation at the Edge of Classical and Quantum Systems
16 pages
null
10.1142/9789812779953_0001
null
physics.gen-ph quant-ph
null
The problem of emergence in physical theories makes necessary to build a general theory of the relationships between the observed system and the observing system. It can be shown that there exists a correspondence between classical systems and computational dynamics according to the Shannon-Turing model. A classical system is an informational closed system with respect to the observer; this characterizes the emergent processes in classical physics as phenomenological emergence. In quantum systems, the analysis based on the computation theory fails. It is here shown that a quantum system is an informational open system with respect to the observer and able to exhibit processes of observational, radical emergence. Finally, we take into consideration the role of computation in describing the physical world.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 16:47:58 GMT" } ]
2016-11-23T00:00:00
[ [ "Licata", "Ignazio", "" ] ]
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711.2974
Francois Loeser
G. Guibert, F. Loeser, M. Merle
Composition with a two variable function
11 pages
Math. Research Letters 16, 439-448 (2009)
null
null
math.AG
null
We compute the motivic nearby cycles of functions obtained by composition of two functions with distinct sets of variables with a two variable function
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:11:30 GMT" } ]
2011-02-25T00:00:00
[ [ "Guibert", "G.", "" ], [ "Loeser", "F.", "" ], [ "Merle", "M.", "" ] ]
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711.2975
Dirk-S\"oren L\"uhmann
Dirk-S\"oren L\"uhmann, Kai Bongs, Klaus Sengstock, Daniela Pfannkuche
Self-Trapping of Bosons and Fermions in Optical Lattices
4 pages, 4 figures. Published version
Phys. Rev. Lett. 101, 050402 (2008)
10.1103/PhysRevLett.101.050402
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically investigate the enhanced localization of bosonic atoms by fermionic atoms in three-dimensional optical lattices and find a self-trapping of the bosons for attractive boson-fermion interaction. Because of this mutual interaction, the fermion orbitals are substantially squeezed, which results in a strong deformation of the effective potential for bosons. This effect is enhanced by an increasing bosonic filling factor leading to a large shift of the transition between the superfluid and the Mott-insulator phase. We find a nonlinear dependency of the critical potential depth on the boson-fermion interaction strength. The results, in general, demonstrate the important role of higher Bloch bands for the physics of attractively interacting quantum gas mixtures in optical lattices and are of direct relevance to recent experiments with 87Rb - 40K mixtures, where a large shift of the critical point has been found.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:13:31 GMT" }, { "version": "v2", "created": "Fri, 1 Aug 2008 06:52:51 GMT" } ]
2008-08-01T00:00:00
[ [ "Lühmann", "Dirk-Sören", "" ], [ "Bongs", "Kai", "" ], [ "Sengstock", "Klaus", "" ], [ "Pfannkuche", "Daniela", "" ] ]
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711.2976
A.C. Fabian
A.C. Fabian (Institute of Astronomy, University of Cambridge, UK)
XMM-Newton and Broad Iron Lines
7 pages, 18 figures, accepted for publication in Astron. Nachr. (ESAC Conference)
null
10.1002/asna.200710902
null
astro-ph
null
Iron line emission is common in the X-ray spectra of accreting black holes. When the line emission is broad or variable then it is likely to originate from close to the black hole. X-ray irradiation of the accretion flow by the power-law X-ray continuum produces the X-ray 'reflection' spectrum which includes the iron line. The shape and variability of the iron lines and reflection can be used as a diagnostic of the radius, velocity and nature of the flow. The inner radius of the dense flow corresponds to the innermost stable circular orbit and thus can be used to determine the spin of the black hole. Studies of broad iron lines and reflection spectra offer much promise for understanding how the inner parts of accretion flows (and outflows) around black holes operate. There remains great potential for XMM-Newton to continue to make significant progress in this work. The need for high quality spectra and thus for long exposure times is paramount.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:17:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Fabian", "A. C.", "", "Institute of Astronomy, University of Cambridge, UK" ] ]
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711.2977
Brendan Casey
Brendan Casey
Rare D Decays
To be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C070805
ECONF C070805:13,2007
10.2172/920724
FERMILAB-CONF-07-615-E
hep-ex
null
We discuss several recent measurements of rare charmed hadron decays. Focus is placed on radiative and annihilation topologies highlighting their sensitivity to new physics and pointing out the strengths and weaknesses of different channels. We compare the different measurement techniques employed at fixed target and $e^+e^-$ dedicated charm experiments, B-factories, and the Tevatron experiments. Comparisons are also made to similar topologies in the beauty, strange, and top systems where appropriate.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:21:04 GMT" } ]
2011-03-18T00:00:00
[ [ "Casey", "Brendan", "" ] ]
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711.2978
Claudio Albanese
Claudio Albanese
Stochastic Mechanics as a Gauge Theory
null
null
null
null
math.PR math-ph math.MP
null
We show that non-relativistic Quantum Mechanics can be faithfully represented in terms of a classical diffusion process endowed with a gauge symmetry of group Z_4. The representation is based on a quantization condition for the realized action along paths. A lattice regularization is introduced to make rigorous sense of the construction and then removed. Quantum mechanics is recovered in the continuum limit and the full U(1) gauge group symmetry of electro-magnetism appears. Anti-particle representations emerge naturally, albeit the context is non-relativistic. Quantum density matrices are obtained by averaging classical probability distributions over phase-action variables. We find that quantum conditioning can be described in classical terms but not through the standard notion of sub sigma-algebras. Delicate restrictions arise by the constraint that we are only interested in the algebra of gauge invariant random variables. We conclude that Quantum Mechanics is equivalent to a theory of gauge invariant classical stochastic processes we call Stochastic Mechanics.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:26:35 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 14:18:17 GMT" }, { "version": "v3", "created": "Fri, 23 Nov 2007 00:41:29 GMT" } ]
2007-11-23T00:00:00
[ [ "Albanese", "Claudio", "" ] ]
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711.2979
Emma Ryan-Weber
Emma V. Ryan-Weber (1), Ayesha Begum (1), Tom Oosterloo (2,3), Sabyasachi Pal (4) Michael J. Irwin (1), Vasily Belokurov (1), N. Wyn Evans (1), and Daniel B. Zucker (1), ((1) IoA, Cambridge, (2) Astron, (3) Kapteyn Institute, (4) NCRA)
The Local Group dwarf Leo T: HI on the brink of star formation
6 pages, 7 figures, accepted for publication in MNRAS on November 15th 2007, full resolution version at: http://www.ast.cam.ac.uk/~eryan/leot.pdf . Typographical error in sound speed equation has led to a new Figure 6 and minor changes to the text
Mon.Not.Roy.Astron.Soc.384:53,2008
10.1111/j.1365-2966.2007.12734.x
null
astro-ph
null
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork ynthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak HI column density is measured to be 7x10^20 cm^-2, and the total HI mass is 2.8Xx10^5 Msun, based on a distance of 420 kpc. Leo T has both cold (~ 500 K) and warm (~ 6000 K) HI at its core, with a global velocity dispersion of 6.9 km/s, from which we derive a dynamical mass within the HI radius of 3.3x10^6 Msun, and a mass-to-light ratio of greater than 50. We calculate the Jeans mass from the radial profiles of the HI column density and velocity dispersion, and predict that the gas should be globally stable against star formation. This finding is inconsistent with the half light radius of Leo T, which extends to 170 pc, and indicates that local conditions must determine where star formation takes place. Leo T is not only the lowest luminosity galaxy with on-going star formation discovered to date, it is also the most dark matter dominated, gas-rich dwarf in the Local Group.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:32:48 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 12:24:11 GMT" } ]
2009-06-23T00:00:00
[ [ "Ryan-Weber", "Emma V.", "" ], [ "Begum", "Ayesha", "" ], [ "Oosterloo", "Tom", "" ], [ "Pal", "Sabyasachi", "" ], [ "Irwin", "Michael J.", "" ], [ "Belokurov", "Vasily", "" ], [ "Evans", "N. Wyn", "" ], [ "Zucker", "Daniel B.", "" ] ]
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711.298
Claudio Albanese
Claudio Albanese
Stochastic Integrals and Abelian Processes
null
null
null
null
math.PR
null
We study triangulation schemes for the joint kernel of a diffusion process with uniformly continuous coefficients and an adapted, non-resonant Abelian process. The prototypical example of Abelian process to which our methods apply is given by stochastic integrals with uniformly continuous coeffcients. The range of applicability includes also a broader class of processes of practical relevance, such as the sup process and certain discrete time summations we discuss. We discretize the space coordinate in uniform steps and assume that time is either continuous or finely discretized as in a fully explicit Euler method and the Courant condition is satisfied. We show that the Fourier transform of the joint kernel of a diffusion and a stochastic integral converges in a uniform graph norm associated to the Markov generator. Convergence also implies smoothness properties for the Fourier transform of the joint kernel. Stochastic integrals are straightforward to define for finite triangulations and the convergence result gives a new and entirely constructive way of defining stochastic integrals in the continuum. The method relies on a reinterpretation and extension of the classic theorems by Feynman-Kac, Girsanov, Ito and Cameron-Martin, which are also re-obtained. We make use of a path-wise analysis without relying on a probabilistic interpretation. The Fourier representation is needed to regularize the hypo-elliptic character of the joint process of a diffusion and an adapted stochastic integral. The argument extends as long as the Fourier analysis framework can be generalized. This condition leads to the notion of non-resonant Abelian process.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:38:20 GMT" } ]
2007-11-20T00:00:00
[ [ "Albanese", "Claudio", "" ] ]
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711.2981
Volodymyr Magas
V.K. Magas, L.P. Csernai
Bjorken model with Freeze Out
7 pages, 5 figures, presented the International Conference "New Trends in High-Energy Physics" (Crimea 2007), Yalta, Crimea, Ukraine, September 15-22, 2007
null
null
null
nucl-th
null
The freeze out of the expanding systems, created in relativistic heavy ion collisions, is discussed. We combine Bjorken scenario with earlier developed freeze out equations into a unified model. The important feature of the proposed model is that physical freeze out is completely finished in a finite time, which can be varied from 0 (freeze out hypersurface) to infinity. The dependence of the post freeze out distribution function on this freeze out time will be studied. As an example model is completely solved and analyzed for the gas of pions.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:49:47 GMT" } ]
2007-11-20T00:00:00
[ [ "Magas", "V. K.", "" ], [ "Csernai", "L. P.", "" ] ]
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711.2982
Remi Tailleux
Remi Tailleux
Thermodynamic inadmissibility of the incompressible hydrodynamics description of turbulent stratified fluid flows at low Mach numbers
9 pages, submitted to Physical Review Letters
null
null
null
physics.flu-dyn physics.ao-ph
null
The incompressible Navier-Stokes equations currently represent the primary model for describing stratified turbulent fluid flows at low Mach number. The validity of the incompressible assumption, however, has so far only been rigorously established for adiabatic motions. Here, we show from first principl es that the use of available energetics and thermodynamics considerations applied to a turbulent mixing event associated with stratified shear flow instability r efutes the widespread idea that the incompressible assumption is also valid when diabatic irreversible effects are important. The main consequence is that dynamics and thermodynamics are strongly coupled in stratified turbulence. This departs strongly from the currently accepted wisdom, and calls for a complete revisiting of the physical processes governing stratified turbulence at low Mach numbers.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 17:53:28 GMT" } ]
2007-11-20T00:00:00
[ [ "Tailleux", "Remi", "" ] ]
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711.2983
Antoni Szczurek
Antoni Szczurek, Tomasz Pietrycki, Anna Rybarska and Gabriela Slipek
Dijet and photon-jet correlations in proton-proton collisions at RHIC
an invited talk at the Memorial Workshop on Hadronic and Quark Matter devoted to J.Zimanyi, Budapest, July 2-4, 2007
PoS LHC07:034,2007; Eur.Phys.J.ST 155:191-200,2008
10.1140/epjst/e2008-00601-7
null
nucl-th astro-ph hep-ph
null
We discuss correlations in azimuthal angle as well as correlations in two-dimensional space of transverse momenta of two jets as well as photon and jet. Some $k_t$-factorization subprocesses are included for the first time in the literature. Different unintegrated gluon/parton distributions are used in the $k_t$-factorization approach. The results depend on UGDF/UPDF used. The collinear NLO $2 \to 3$ contributions dominate over $k_t$-factorization cross section at small relative azimuthal angles as well as for asymmetric transverse momentum configurations.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:02:23 GMT" } ]
2011-07-19T00:00:00
[ [ "Szczurek", "Antoni", "" ], [ "Pietrycki", "Tomasz", "" ], [ "Rybarska", "Anna", "" ], [ "Slipek", "Gabriela", "" ] ]
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711.2984
Guido Tiana
Guido Tiana
Estimation of microscopic averages from metadynamics
null
null
10.1140/epjb/e2008-00232-8
null
cond-mat.stat-mech cond-mat.soft
null
With the help of metadynamics it is possible to calculate efficiently the free energy of systems displaying high energy barriers as a function of few selected "collective variables". In doing this, the contribution of all the other degrees of freedom ("microscopic" variables) is averaged out and, thus, lost. In the following, it is shown that it is possible to calculate the thermal average of these microscopic degrees of freedom during the metadynamics, not loosing this piece of information.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:03:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Tiana", "Guido", "" ] ]
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711.2985
Leo Radzihovsky
Leo Radzihovsky, Quan Zhang
Conical soliton escape into a third dimension of a surface vortex
9 pages, 8 eps figures, accepted by PRE
Phys. Rev. E 79, 041702 (2009)
10.1103/PhysRevE.79.041702
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an exact three-dimensional solitonic solution to a sine-Gordon-type Euler-Lagrange equation, that describes a configuration of a three-dimensional vector field n constrained to a surface p-vortex, with a prescribed polar tilt angle on a planar substrate and escaping into the third dimension in the bulk. The solution is relevant to characterization of a schlieren texture in nematic liquid-crystal films with tangential (in-plane) substrate alignment. The solution is identical to a section of a point defect discovered many years ago by Saupe [Mol. Cryst. Liq. Cryst. 21, 211 (1973)], when latter is restricted to a surface.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:03:52 GMT" }, { "version": "v2", "created": "Fri, 3 Apr 2009 23:49:20 GMT" } ]
2009-04-22T00:00:00
[ [ "Radzihovsky", "Leo", "" ], [ "Zhang", "Quan", "" ] ]
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711.2986
Robert Thorne S
R.S. Thorne
The role of uncertainties in parton distribution functions
10 pages, 15 figures as .ps or .eps files, invited talk at PHYSTAT-LHC Workshop on Statistical Issues for LHC Physics, June 2007
null
null
null
hep-ph
null
I consider the uncertainties in parton distributions and the consequences for hadronic cross-sections. There is ever-increasing sophistication in the relationship between the uncertainties of the distributions and the errors on the experimental data used to extract them. However, I demonstrate that this uncertainty is frequently subsumed by that due to the choice of data used in fits, and more surprisingly by the precise details of the theoretical framework used. Variations in heavy flavour prescriptions provide striking examples.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:07:19 GMT" } ]
2007-11-20T00:00:00
[ [ "Thorne", "R. S.", "" ] ]
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711.2987
Martin Kerin
Jost-Hinrich Eschenburg (Universit\"at Augsburg), Martin Kerin (University of Pennsylvania)
Almost positive curvature on the Gromoll-Meyer sphere
8 pages, 1 figure, to appear in Proc. Amer. Math. Soc
null
null
null
math.DG
null
Gromoll and Meyer have represented a certain exotic 7-sphere $\Sigma^7$ as a biquotient of the Lie group $G = Sp(2)$. We show for a 2-parameter family of left invariant metrics on $G$ that the induced metric on $\Sigma^7$ has strictly positive sectional curvature at all points outside four subvarieties of codimension $\geq 1$ which we describe explicitly.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:08:36 GMT" } ]
2007-11-20T00:00:00
[ [ "Eschenburg", "Jost-Hinrich", "", "Universität Augsburg" ], [ "Kerin", "Martin", "", "University of Pennsylvania" ] ]
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711.2988
Steve Brice
Steve Brice
Neutrino Experiments: Status, Recent Progress, and Prospects
14 pages, 10 figures, proceedings of plenary talk at EPS HEP 2007 Conference, Manchester, UK. Updated with citation added to Figure 10
J.Phys.Conf.Ser.110:012008,2008
10.1088/1742-6596/110/1/012008
FERMILAB-CONF-07-617-E
hep-ex
null
Neutrino physics has seen an explosion of activity and new results in the last decade. In this report the current state of the field is summarized, with a particular focus on progress in the last two years. Prospects for the near term (roughly 5 years) are also described.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:14:10 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 04:13:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Brice", "Steve", "" ] ]
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711.2989
Alexander Shirokov V
Alexander Shirokov (CITA)
Gravitational Softening and Adaptive Mass Resolution
27 pages, 6 figures; Minor additions; WSHAPE package available at http://www.gracos.org/wshape; Submitted to the Journal of Computational Physics
null
null
null
astro-ph
null
Pairwise forces between particles in cosmological N-body simulations are generally softened to avoid hard collisions. Physically, this softening corresponds to treating the particles as diffuse clouds rather than point masses. For particles of unequal mass (and hence unequal softening length), computing the softened force involves a nontrivial double integral over the volumes of the two particles. We show that Plummer force softening is consistent with this interpretation of softening while spline softening is not. We provide closed-form expressions and numerical implementation for pairwise gravitational force laws for pairs of particles of general softening scales $\epsilon_1$ and $\epsilon_2$ assuming the commonly used cloud profiles: NGP, CIC, TSC, and PQS. Similarly, we generalize Plummer force law into pairs of particles of general softenings. We relate our expressions to the gaussian, Plummer and spline force softenings known from literature. Our expressions allow possible inclusions of pointlike particles such as stars or supermassive black holes.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 20:55:04 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 03:28:06 GMT" }, { "version": "v3", "created": "Wed, 9 Apr 2008 20:19:08 GMT" } ]
2008-04-10T00:00:00
[ [ "Shirokov", "Alexander", "", "CITA" ] ]
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711.299
Dorin Ervin Dutkay
Dorin Ervin Dutkay and Palle E.T. Jorgensen
Quasiperiodic Spectra and Orthogonality for Iterated Function System Measures
null
null
null
null
math.CA math.GM
null
We extend classical basis constructions from Fourier analysis to attractors for affine iterated function systems (IFSs). This is of interest since these attractors have fractal features, e.g., measures with fractal scaling dimension. Moreover, the spectrum is then typically quasi-periodic, but non-periodic, i.e., the spectrum is a ``small perturbation'' of a lattice. Due to earlier research on IFSs, there are known results on certain classes of spectral duality-pairs, also called spectral pairs or spectral measures. It is known that some duality pairs are associated with complex Hadamard matrices. However, not all IFSs $X$ admit spectral duality. When $X$ is given, we identify geometric conditions on $X$ for the existence of a Fourier spectrum, serving as the second part in a spectral pair. We show how these spectral pairs compose, and we characterize the decompositions in terms of atoms. The decompositions refer to tensor product factorizations for associated complex Hadamard matrices.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:31:26 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 16:26:03 GMT" } ]
2008-02-13T00:00:00
[ [ "Dutkay", "Dorin Ervin", "" ], [ "Jorgensen", "Palle E. T.", "" ] ]
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711.2991
Fernando Ruiz
G. Horcajada, F. Ruiz Ruiz
Quantization of the open string on plane-wave limits of dS_n x S^n and non-commutativity outside branes
31 pages, 12pt
Nucl.Phys.B799:110-135,2008
10.1016/j.nuclphysb.2008.02.016
null
hep-th
null
The open string on the plane-wave limit of $dS_n\times S^n $ with constant $B_2$ and dilaton background fields is canonically quantized. This entails solving the classical equations of motion for the string, computing the symplectic form, and defining from its inverse the canonical commutation relations. Canonical quantization is proved to be perfectly suited for this task, since the symplectic form is unambiguously defined and non-singular. The string position and the string momentum operators are shown to satisfy equal-time canonical commutation relations. Noticeably the string position operators define non-commutative spaces for all values of the string world-sheet parameter $\sig$, thus extending non-commutativity outside the branes on which the string endpoints may be assumed to move. The Minkowski spacetime limit is smooth and reproduces the results in the literature, in particular non-commutativity gets confined to the endpoints.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:36:15 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 13:43:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Horcajada", "G.", "" ], [ "Ruiz", "F. Ruiz", "" ] ]
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711.2992
Steven Willison
C. Garraffo, G. Giribet, E. Gravanis, S. Willison
Gravitational solitons and $C^0$ vacuum metrics in five-dimensional Lovelock gravity
48 pages, LaTex, 16 figures. A slightly shorter version of this paper is accepted for publication in J. Math. Phys
J.Math.Phys.49:042502,2008
10.1063/1.2890377
CECS-PHY-07/22
gr-qc hep-th
null
Junction conditions for vacuum solutions in five-dimensional Einstein-Gauss-Bonnet gravity are studied. We focus on those cases where two spherically symmetric regions of space-time are joined in such a way that the induced stress tensor on the junction surface vanishes. So a spherical vacuum shell, containing no matter, arises as a boundary between two regions of the space-time. A general analysis is given of solutions that can be constructed by this method of geometric surgery. Such solutions are a generalized kind of spherically symmetric empty space solutions, described by metric functions of the class $C^0$. New global structures arise with surprising features. In particular, we show that vacuum spherically symmetric wormholes do exist in this theory. These can be regarded as gravitational solitons, which connect two asymptotically (Anti) de-Sitter spaces with different masses and/or different effective cosmological constants. We prove the existence of both static and dynamical solutions and discuss their (in)stability under perturbations that preserve the symmetry. This leads us to discuss a new type of instability that arises in five-dimensional Lovelock theory of gravity for certain values of the coupling of the Gauss-Bonnet term. The issues of existence and uniqueness of solutions and determinism in the dynamical evolution are also discussed.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:39:07 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 23:46:49 GMT" }, { "version": "v3", "created": "Tue, 15 Jan 2008 23:46:34 GMT" }, { "version": "v4", "created": "Thu, 28 Feb 2008 02:38:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Garraffo", "C.", "" ], [ "Giribet", "G.", "" ], [ "Gravanis", "E.", "" ], [ "Willison", "S.", "" ] ]
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711.2993
Humberto Carmona PhD
H. A. Carmona, F. K. Wittel, F. Kun and H. J. Herrmann
Fragmentation processes in impact of spheres
null
null
10.1103/PhysRevE.77.051302
null
cond-mat.stat-mech
null
We study the brittle fragmentation of spheres by using a three-dimensional Discrete Element Model. Large scale computer simulations are performed with a model that consists of agglomerates of many particles, interconnected by beam-truss elements. We focus on the detailed development of the fragmentation process and study several fragmentation mechanisms. The evolution of meridional cracks is studied in detail. These cracks are found to initiate in the inside of the specimen with quasi-periodic angular distribution. The fragments that are formed when these cracks penetrate the specimen surface give a broad peak in the fragment mass distribution for large fragments that can be fitted by a two-parameter Weibull distribution. This mechanism can only be observed in 3D models or experiments. The results prove to be independent of the degree of disorder in the model. Our results significantly improve the understanding of the fragmentation process for impact fracture since besides reproducing the experimental observations of fragment shapes, impact energy dependence and mass distribution, we also have full access to the failure conditions and evolution.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:45:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Carmona", "H. A.", "" ], [ "Wittel", "F. K.", "" ], [ "Kun", "F.", "" ], [ "Herrmann", "H. J.", "" ] ]
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711.2994
Sumit Das
Adel Awad, Sumit R. Das, K. Narayan and Sandip P. Trivedi
Gauge Theory Duals of Cosmological Backgrounds and their Energy Momentum Tensors
17 pages, LaTeX, v2: minor modifications
Phys.Rev.D77:046008,2008
10.1103/PhysRevD.77.046008
UK/07-11
hep-th
null
We revisit Type IIB supergravity backgrounds with null and spacelike singularities with natural gauge theory duals proposed in {\tt hep-th/0602107} and {\tt hep-th/0610053}. We show that for these backgrounds there are always choices of the boundaries of these deformed $AdS_5 \times S^5$ space-times, such that the dual gauge theories live on {\it flat} metrics and have space-time dependent couplings. We present a new time dependent solution of this kind where the effective string coupling is always bounded and vanishes at a spacelike singularity in the bulk, and the space-time becomes $AdS_5 \times S^5$ at early and late times. The holographic energy momentum tensor calculated with a choice of flat boundary is shown to vanish for null backgrounds and to be generically non-zero for time dependent backgrounds.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:50:38 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 15:05:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Awad", "Adel", "" ], [ "Das", "Sumit R.", "" ], [ "Narayan", "K.", "" ], [ "Trivedi", "Sandip P.", "" ] ]
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711.2995
Joerg Aichelin
J. Aichelin, H. Petersen, S. Vogel, M. Bleicher
How can we explore the onset of deconfinement by experiment?
invited talk, workshop on Critical Point and Onset of Deconfinement (CPOD), GSI(Darmstadt), July 9-13, 2007
PoSCPOD07:004,2007
null
null
nucl-th
null
There is little doubt that Quantumchromodynamics (QCD) is the theory which describes strong interaction physics. Lattice gauge simulations of QCD predict that in the $\mu,T$ plane there is a line where a transition from confined hadronic matter to deconfined quarks takes place. The transition is either a cross over (at low $\mu$) or of first order (at high $\mu$). It is the goal of the present and future heavy ion experiment at RHIC and FAIR to study this phase transition at different locations in the $\mu,T$ plane and to explore the properties of the deconfined phase. It is the purpose of this contribution to discuss some of the observables which are considered as useful for this purpose.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:52:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Aichelin", "J.", "" ], [ "Petersen", "H.", "" ], [ "Vogel", "S.", "" ], [ "Bleicher", "M.", "" ] ]
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711.2996
Ryan Requist
Ryan Requist and Oleg Pankratov
The Kohn-Sham system in one-matrix functional theory
17 pages, 6 figures
Phys. Rev. B, vol. 77, 235121 (2008)
10.1103/PhysRevB.77.235121
null
cond-mat.str-el
null
A system of electrons in a local or nonlocal external potential can be studied with 1-matrix functional theory (1MFT), which is similar to density functional theory (DFT) but takes the one-particle reduced density matrix (1-matrix) instead of the density as its basic variable. Within 1MFT, Gilbert derived [PRB 12, 2111 (1975)] effective single-particle equations analogous to the Kohn-Sham (KS) equations in DFT. The self-consistent solution of these 1MFT-KS equations reproduces not only the density of the original electron system but also its 1-matrix. While in DFT it is usually possible to reproduce the density using KS orbitals with integer (0 or 1) occupancy, in 1MFT reproducing the 1-matrix requires in general fractional occupancies. The variational principle implies that the KS eigenvalues of all fractionally occupied orbitals must collapse at self-consistency to a single level, equal to the chemical potential. We show that as a consequence of the degeneracy the iteration of the KS equations is intrinsically divergent. Fortunately, the level shifting method, commonly introduced in Hartree-Fock calculations, is always able to force convergence. We introduce an alternative derivation of the 1MFT-KS equations that allows control of the eigenvalue collapse by constraining the occupancies. As an explicit example, we apply the 1MFT-KS scheme to calculate the ground state 1-matrix of an exactly solvable two-site Hubbard model.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:54:26 GMT" } ]
2008-07-23T00:00:00
[ [ "Requist", "Ryan", "" ], [ "Pankratov", "Oleg", "" ] ]
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711.2997
Peter Watson
P. Watson and H. Reinhardt
Completing Continuum Coulomb Gauge in the Functional Formalism
4 pages, no figures
null
null
null
hep-th hep-lat hep-ph
null
It is argued that within the continuum functional formalism, there is no need to supply a further (spatially independent) gauge constraint to complete the Coulomb gauge of Yang-Mills theory. It is shown explicitly that a natural completion of the gauge-fixing leads to a contradiction with the perturbative renormalizability of the theory.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:57:21 GMT" } ]
2007-11-20T00:00:00
[ [ "Watson", "P.", "" ], [ "Reinhardt", "H.", "" ] ]
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711.2998
Benjamin Leveque
Yannick Frein (LGS), Benjamin L\'ev\^eque (LGS), Andras Sebo (LGS)
Optimizing diversity
null
null
null
null
cs.DM
null
We consider the problem of minimizing the size of a family of sets G such that every subset of 1,...,n can be written as a disjoint union of at most k members of G, where k and n are given numbers. This problem originates in a real-world application aiming at the diversity of industrial production. At the same time, the minimum of G so that every subset of 1,...,n is the union of two sets in G has been asked by Erdos and studied recently by Furedi and Katona without requiring the disjointness of the sets. A simple construction providing a feasible solution is conjectured to be optimal for this problem for all values of n and k and regardless of the disjointness requirement; we prove this conjecture in special cases including all (n,k) for which n <= 3k holds, and some individual values of n and k.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 18:58:06 GMT" } ]
2007-11-20T00:00:00
[ [ "Frein", "Yannick", "", "LGS" ], [ "Lévêque", "Benjamin", "", "LGS" ], [ "Sebo", "Andras", "", "LGS" ] ]
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711.2999
Masayuki Hase Oka
M. O. Hase and J. F. F. Mendes
Solvable Metric Growing Networks
null
J. Stat. Mech. (2008) P12002
10.1088/1742-5468/2008/12/P12002
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Structure and dynamics of complex networks usually deal with degree distributions, clustering, shortest path lengths and other graph properties. Although these concepts have been analysed for graphs on abstract spaces, many networks happen to be embedded in a metric arrangement, where the geographic distance between vertices plays a crucial role. The present work proposes a model for growing network that takes into account the geographic distance between vertices: the probability that they are connected is higher if they are located nearer than farther. In this framework, the mean degree of vertices, degree distribution and shortest path length between two randomly chosen vertices are analysed.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 20:53:47 GMT" }, { "version": "v2", "created": "Tue, 25 Nov 2008 18:02:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Hase", "M. O.", "" ], [ "Mendes", "J. F. F.", "" ] ]
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711.3
Bruno Galvan
Bruno Galvan
Quantum Mechanics and imprecise probability
16 pages, 1 figure. To appear in Journal of Statistical Physics, almost the published version
J. Stat. Phys. 131, 1155-1167 (2008)
10.1007/s10955-008-9530-2
null
quant-ph
null
An extension of the Born rule, the {\it quantum typicality rule}, has recently been proposed [B. Galvan: Found. Phys. 37, 1540-1562 (2007)]. Roughly speaking, this rule states that if the wave function of a particle is split into non-overlapping wave packets, the particle stays approximately inside the support of one of the wave packets, without jumping to the others. In this paper a formal definition of this rule is given in terms of {\it imprecise probability}. An imprecise probability space is a measurable space $(\Omega, {\cal A})$ endowed with a {\it set} of probability measures $\cal P$. The quantum formalism and the quantum typicality rule allow us to define a set of probabilities ${\cal P}_\Psi$ on $(X^T, {\cal F})$, where $X$ is the configuration space of a quantum system, $T$ is a time interval and ${\cal F}$ is the $\sigma$-algebra generated by the cylinder sets. Thus, it is proposed that a quantum system can be represented as the {\it imprecise stochastic process} $(X^T, {\cal F}, {\cal P}_\Psi)$, which is a canonical stochastic process in which the single probability measure is replaced by a set of measures. It is argued that this mathematical model, when used to represent macroscopic systems, has sufficient predictive power to explain both the results of the statistical experiments and the quasi-classical structure of the macroscopic evolution.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 19:12:13 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 20:08:58 GMT" } ]
2008-06-08T00:00:00
[ [ "Galvan", "Bruno", "" ] ]
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711.3001
Natalia Ivanova
Natalia Ivanova, Craig O. Heinke, Frederic A. Rasio
Formation of Millisecond Pulsars in Globular Clusters
6 pages, 3 figures, to appear in the proceedings of the 40 Years of Pulsars conference held at McGill University in August 2007
AIP Conf.Proc.983:442-447,2008
10.1063/1.2900271
null
astro-ph
null
In this contribution we discuss how neutron stars are produced and retained in globular clusters, outlining the most important dynamical channels and evolutionary events that affect thepopulation of mass-transferring binaries with neutron stars and result in the formation of recycled pulsars. We confirm the importance of electron-capture supernovae in globular clusters as the major supplier of retained neutron stars.By comparing the observed millisecond pulsar population and the results obtained from simulations, we discuss several constraints on the evolution of mass-transferring systems.In particular, we find that in our cluster model the following mass-gaining events create populations of MSPs that do not match the observations (with respect to binary periods and companion masses or the number of produced systems) and therefore likely do not lead to NSs spun up to millisecond periods: (i) accretion during a common envelope event with a NS formed through accretion-induced collapse, and (ii) mass transfer from a WD donor. By restricting ourselves to the evolutionary and dynamical paths that most likely lead to neutron star recycling, we obtain good agreement between our models and the numbers and characteristics of observed millisecond pulsars in the clusters Terzan 5 and 47 Tuc.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 20:33:57 GMT" } ]
2009-06-23T00:00:00
[ [ "Ivanova", "Natalia", "" ], [ "Heinke", "Craig O.", "" ], [ "Rasio", "Frederic A.", "" ] ]
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711.3002
Gabriela Aurelio
G. Aurelio, J. Curiale, R.D. Sanchez and G.J. Cuello
Probing phase coexistence and stabilization of the spin-ordered ferrimagnetic state by Calcium addition in the YBa_{1-x}Ca_{x}Co_{2}O_{5.5} layered cobaltites using neutron diffraction
null
null
10.1103/PhysRevB.76.214417
null
cond-mat.str-el cond-mat.mtrl-sci
null
In this article we study the effects of a partial substitution of Ba with the smaller cation Ca in the layered cobaltites YBaCo_2O_{5+\delta} for \delta \approx 0.5. Neutron thermodiffractograms are reported for the compounds YBa_{0.95}Ca_{0.05}Co_2O_{5.5} (x_{Ca}=0.05) and YBa_{0.90}Ca_{0.10}Co_2O_{5.5} (x_{Ca}=0.10) in the temperature range 20 K \leq T \leq 300 K, as well as high resolution neutron diffraction experiments at selected temperatures for the samples x_{Ca}=0.05, x_{Ca}=0.10 and the parent compound x_{Ca}=0. We have found the magnetic properties to be strongly affected by the cationic substitution. Although the "122" perovskite structure seems unaffected by Ca addition, the magnetic arrangements of Co ions are drastically modified: the antiferromagnetic (AFM) long-range order is destroyed, and a ferrimagnetic phase with spin state order is stabilized below T \sim 290 K. For the sample with x_{Ca}=0.05 a fraction of AFM phase coexists with the ferrimagnetic one below T \sim 190 K, whereas for x_{Ca}=0.10 the AFM order is completely lost. The systematic refinement of the whole series has allowed for a better understanding of the observed low-temperature diffraction patterns of the parent compound, YBaCo_2O_{5.5}, which had not yet been clarified. A two-phase scenario is proposed for the x_{Ca}=0 compound which is compatible with the phase coexistence observed in the x_{Ca}=0.05 sample.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 19:23:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Aurelio", "G.", "" ], [ "Curiale", "J.", "" ], [ "Sanchez", "R. D.", "" ], [ "Cuello", "G. J.", "" ] ]
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711.3003
Georg Weiglein
Georg Weiglein
Electroweak Physics at the ILC
5 pages, contribution to the proceedings of EPS07
J.Phys.Conf.Ser.110:042033,2008
10.1088/1742-6596/110/4/042033
IPPP/07/85, DCPT/07/170
hep-ph
null
Some aspects of electroweak physics at the International Linear Collider (ILC) are reviewed. The importance of precision measurements in the Higgs sector and in top-quark physics is emphasized, and the physics potential of the GigaZ option of the ILC is discussed. It is shown in particular that even in a scenario where the states of new physics are so heavy that they would be outside of the reach of the LHC and the first phase of the ILC, the GigaZ precision on the effective weak mixing angle may nevertheless allow the detection of quantum effects of new physics.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 19:24:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Weiglein", "Georg", "" ] ]
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711.3004
Kurt Langfeld
Kurt Langfeld
Computational Methods in Quantum Field Theory
50 pages, 16 figures, notes based on a lecture presented at the XIX Physics Graduate Days at the University of Heidelberg, 8th - 12th October 2007
null
null
null
hep-lat
null
After a brief introduction to the statistical description of data, these lecture notes focus on quantum field theories as they emerge from lattice models in the critical limit. For the simulation of these lattice models, Markov chain Monte-Carlo methods are widely used. We discuss the heat bath and, more modern, cluster algorithms. The Ising model is used as a concrete illustration of important concepts such as correspondence between a theory of branes and quantum field theory or the duality map between strong and weak couplings. The notes then discuss the inclusion of gauge symmetries in lattice models and, in particular, the continuum limit in which quantum Yang-Mills theories arise.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 19:44:49 GMT" } ]
2007-11-20T00:00:00
[ [ "Langfeld", "Kurt", "" ] ]
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711.3005
Jan Staff
Jan Staff, Brian Niebergal, and Rachid Ouyed
Gamma Ray Burst engine activity within the quark nova scenario: Prompt emission, X-ray Plateau, and sharp drop-off
4 pages, submitted to ApJL
null
10.1111/j.1365-2966.2008.13465.x
null
astro-ph
null
We present a three-stage model for a long GRB inner engine to explain the prompt gamma ray emission, and interpret recent Swift satellite observations of early X-ray afterglow plateaus followed by a sharp drop off or a shallow power law decay. The three stages involves a neutron star phase, a quark star (QS) and a black hole phase as described in Staff et al. (2007). We find that the QS stage allows for more energy to be extracted from neutron star to QS conversion as well as from ensuing accretion onto the QS. The QS accretion phase naturally extends the engine activity and can account for both the prompt emission and irregular early X-ray afterglow activity. Following the accretion phase, the QS can spin-down by emission of a baryon-free outflow. The magnetar-like magnetic field strengths resulting from the NS to QS transition provide enough spin-down energy, for the correct amount of time, to account for the plateau in the X-ray afterglow. In our model, a sharp drop-off following the plateau occurs when the QS collapses to a BH during the spin-down, thus shutting-off the secondary outflow. We applied our model to GRB 070110 and GRB 060607A and found that we can consistently account for the energetics and duration during the prompt and plateau phases.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 20:05:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Staff", "Jan", "" ], [ "Niebergal", "Brian", "" ], [ "Ouyed", "Rachid", "" ] ]
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711.3006
Alexandros Gezerlis
Alexandros Gezerlis and J. Carlson
Strongly paired fermions: Cold atoms and neutron matter
5 pages, 4 figures; 3 references added; v2 corresponds to the published version
Phys.Rev.C77:032801,2008
10.1103/PhysRevC.77.032801
LA-UR-07-7894
nucl-th cond-mat.other
null
Experiments with cold Fermi atoms can be tuned to probe strongly interacting fluids that are very similar to the low-density neutron matter found in the crusts of neutron stars. In contrast to traditional superfluids and superconductors, matter in this regime is very strongly paired, with gaps of the order of the Fermi energy. We compute the T=0 equation of state and pairing gap for cold atoms and low-density neutron matter as a function of the Fermi momentum times the scattering length. Results of quantum Monte Carlo calculations show that the equations of state are very similar. The neutron matter pairing gap at low densities is found to be very large but, except at the smallest densities, significantly suppressed relative to cold atoms because of the finite effective range in the neutron-neutron interaction.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 19:59:16 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 20:56:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Gezerlis", "Alexandros", "" ], [ "Carlson", "J.", "" ] ]
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711.3007
Yasushi Mino
Yasushi Mino
Modulation of the gravitational waveform by the effect of radiation reaction
Expressions are corrected for easier reading
Phys.Rev.D77:044008,2008
10.1103/PhysRevD.77.044008
null
gr-qc
null
When we calculate gravitational waveforms from extreme-mass-ratio inspirals (EMRIs) by metric perturbation, it is a common strategy to use the adiabatic approximation. Under that approximation, we first calculate the linear metric perturbation induced by geodesics orbiting a black hole, then we calculate the adiabatic evolution of the parameters of geodesics due to the radiation reaction effect through the calculation of the self-force. This procedure is considered to be reasonable, however, there is no direct proof that it can actually produce the correct waveform we would observe. In this paper, we study the formal expression of the second order metric perturbation and show that it be expressed as the linear metric perturbation modulated by the adiabatic evolution of the geodesic. This evidence supports the assumption that the adiabatic approximation can produce the correct waveform, and that the adiabatic expansion we propose in Ref.\cite{adi} is an appropriate perturbation expansion for studying the radiation reaction effect on the gravitational waveform.
[ { "version": "v1", "created": "Mon, 19 Nov 2007 23:37:31 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 18:42:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Mino", "Yasushi", "" ] ]
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