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711.5008
Chi Hin Chan
Chi Hin Chan
Smoothness criteria for Navier-Stokes equations in terms of regularity along the steam lines
25 pages
null
null
null
math.AP
null
This article is devoted to a regularity criteria for solutions of the Navier-Stokes equations in terms of regularity along the stream lines. More precisely, we prove that a suitable weak solution for the Navier-Stokes equations is regular under some constraint on the second derivative of |u| along the stream lines.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:09:42 GMT" } ]
2007-12-03T00:00:00
[ [ "Chan", "Chi Hin", "" ] ]
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711.5009
Ian Leary
H. H. Glover, I. J. Leary and C. B. Thomas
The Yagita invariant of general linear groups
null
Proceedings of the 1994 Barcelona Conference on Algebraic Topology, Progress in Mathematics 136, Birkhaeuser (1996) 185-192
null
null
math.GR math.AT
null
We give a definition of the Yagita invariant at a prime p of an arbitrary group G, and compute the invariant for each prime for the general linear groups over any integrally closed subring of the complex numbers. We also compute the invariants for special linear groups over the same rings, except in some cases when both the degree of the linear group and the ring are `small' compared to p.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:12:24 GMT" } ]
2007-12-03T00:00:00
[ [ "Glover", "H. H.", "" ], [ "Leary", "I. J.", "" ], [ "Thomas", "C. B.", "" ] ]
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711.501
Pierluigi Falco
G. Benfatto, P. Falco, V. Mastropietro
Massless Sine-Gordon and Massive Thirring Models: proof of the Coleman's equivalence
55 pages, 1 figure minor corrections
Commun.Math.Phys.285:713-762,2009
10.1007/s00220-008-0619-x
null
hep-th math-ph math.MP
null
We prove the Coleman's conjecture on the equivalence between the massless Sine-Gordon model with finite volume interaction and the Thirring model with a finite volume mass term.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:18:08 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 18:36:22 GMT" } ]
2010-01-29T00:00:00
[ [ "Benfatto", "G.", "" ], [ "Falco", "P.", "" ], [ "Mastropietro", "V.", "" ] ]
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711.5011
Ian Leary
Warren Dicks, Ian J Leary
On subgroups of Coxeter groups
null
Geometry and Cohomology in Group Theory, Durham 1995, LMS Lecture Notes in Mathematics 252, CUP 1998, 124-160
null
null
math.GR
null
A right-angled Coxeter group is a group with a given set of generators of order two, subject only to the relations that certain pairs of the generators commute. Various papers have shown how homological properties of the Coxeter group are related to homological properties of the simplicial complex whose simplices are the sets of commuting generators. Using these techniques, we construct torsion-free groups which are Poincare duality groups over some rings but not over others, and a group whose integral cohomological dimension is finite but strictly greater than its cohomological dimension over any field. We determine which Coxeter groups have finite virtual cohomological dimension (it is classical that all finitely generated Coxeter groups have finite vcd, but there are others). We also give minimal presentations for certain torsion-free finite-index subgroups of right-angled Coxter groups. Finally we give a `bare-hands' construction (using free products with amalgamation and HNN extensions) of a torsion-free group whose integral cohomological dimension is strictly greater than its rational cohomological dimension.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:21:22 GMT" } ]
2007-12-03T00:00:00
[ [ "Dicks", "Warren", "" ], [ "Leary", "Ian J", "" ] ]
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711.5012
Steven B. Giddings
Steven B. Giddings and Mark Srednicki
High-energy gravitational scattering and black hole resonances
22 pages, harvmac. v2: minor corrections
Phys.Rev.D77:085025,2008
10.1103/PhysRevD.77.085025
null
hep-th gr-qc
null
Aspects of super-planckian gravitational scattering and black hole formation are investigated, largely via a partial-wave representation. At large and decreasing impact parameters, amplitudes are expected to be governed by single graviton exchange, and then by eikonalized graviton exchange, for which partial-wave amplitudes are derived. In the near-Schwarzschild regime, perturbation theory fails. However, general features of gravitational scattering associated with black hole formation suggest a particular form for amplitudes, which we express as a black hole ansatz. We explore features of this ansatz, including its locality properties. These amplitudes satisfy neither the Froissart bound, nor apparently the more fundamental property of polynomial boundedness, through which locality is often encoded in an S-matrix framework. Nevertheless, these amplitudes do satisfy a macroscopic form of causality, expressed as a polynomial bound for the forward-scattering amplitude.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:30:24 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 04:03:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Giddings", "Steven B.", "" ], [ "Srednicki", "Mark", "" ] ]
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711.5013
Ian Leary
David J Green, Ian J Leary
Chern classes and extraspecial groups
null
Manuscripta Math. 88 (1995) 73-84
10.1007/BF02567806
null
math.GR math.AT
null
The mod-p cohomology ring of the extraspecial p-group of exponent p is studied for odd p. We investigate the subquotient ch(G) generated by Chern classes modulo the nilradical. The subring of ch(G) generated by Chern classes of one-dimensional representations was studied by Tezuka and Yagita. The subring generated by the Chern classes of the faithful irreducible representations is a polynomial algebra. We study the interplay between these two families of generators, and obtain some relations between them.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:30:58 GMT" } ]
2015-02-23T00:00:00
[ [ "Green", "David J", "" ], [ "Leary", "Ian J", "" ] ]
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711.5014
Ian Leary
I. J. Leary, B. Schuster and N. Yagita
On universally stable elements
null
Quart. J. Math. Oxford 48 (1997) 493--498
null
null
math.GR math.AT
null
We show that certain subrings of the cohomology of a finite p-group P may be realised as the images of restriction from suitable virtually free groups. We deduce that the cohomology of P is a finite module for any such subring. Examples include the ring of `universally stable elements' defined by Evens and Priddy, and rings of invariants such as the mod-2 Dickson algebras.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:34:23 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "I. J.", "" ], [ "Schuster", "B.", "" ], [ "Yagita", "N.", "" ] ]
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711.5015
William Kilgore
William B. Kilgore
One-loop Integral Coefficients from Generalized Unitarity
16 pages, 5 figures
null
null
null
hep-ph
null
I describe a method for determining the coefficients of scalar integrals for one-loop amplitudes in quantum field theory. The method is based upon generalized unitarity and the behavior of amplitudes when the free parameters of the cut momenta approach infinity. The method works for arbitrary masses of both external and internal legs of the amplitudes. It therefore applies not only to QCD but also to the Electroweak theory and to quantum field theory in general.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:34:41 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 02:26:48 GMT" } ]
2008-05-12T00:00:00
[ [ "Kilgore", "William B.", "" ] ]
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711.5016
Ian Leary
I. J. Leary and B. Schuster
On the GL(V)-module structure of K(n)^*(BV)
null
Math. Proc. Cambridge Phil. Soc. 122 (1997) 73-89
10.1017/S0305004196001570
null
math.AT
null
We study the question of whether the Morava K-theory of the classifying space of an elementary abelian group V is a permutation module (in either of two distinct senses) for the automorphism group of V. We use Brauer characters and computer calculations. We construct and implement an algorithm for finding permutation submodules of maximal dimension inside modules for p-groups in characteristic p.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:38:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Leary", "I. J.", "" ], [ "Schuster", "B.", "" ] ]
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711.5017
Ian Leary
Ian J Leary
On the integral cohomology of wreath products
null
J. Algebra 198 (1996), 184-239
null
null
math.GR math.AT
null
Under mild conditions on the space X, we describe the additive structure of the integral cohomology of the space $X^p \times_{C_p}EC_p$ in terms of the cohomology of X. We give weaker results for other similar spaces, and deduce various corollaries concerning the cohomology of finite groups.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:43:36 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J", "" ] ]
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711.5018
Ian Leary
Ian J Leary, Muge Saadetoglu
The cohomology of Bestvina-Brady groups
Submitted July 2006
null
null
null
math.AT math.GR
null
For each subcomplex of the standard CW-structure on any torus, we compute the homology of a certain infinite cyclic regular covering space. In all cases when the homology is finitely generated, we also compute the cohomology ring. For aspherical subcomplexes of the torus our computation gives the homology and cohomology of Bestvina-Brady groups. We compute the cohomological dimension of each of these groups over any field and over any subring of the rationals.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:50:27 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J", "" ], [ "Saadetoglu", "Muge", "" ] ]
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711.5019
Alexander Gerlach
Stefan Sellner, Alexander Gerlach, Stefan Kowarik, Frank Schreiber, Helmut Dosch, Stephan Meyer, Jens Pflaum, Gerhard Ulbricht
Comparative study of the growth of sputtered aluminum oxide films on organic and inorganic substrates
null
null
10.1016/j.tsf.2007.12.151
null
cond-mat.mtrl-sci cond-mat.soft
null
We present a comparative study of the growth of the technologically highly relevant gate dielectric and encapsulation material aluminum oxide in inorganic and also organic heterostructures. Atomic force microscopy studies indicate strong similarities in the surface morphology of aluminum oxide films grown on these chemically different substrates. In addition, from X-ray reflectivity measurements we extract the roughness exponent \beta of aluminum oxide growth on both substrates. By renormalising the aluminum oxide roughness by the roughness of the underlying organic film we find good agreement with \beta as obtained from the aluminum oxide on silicon oxide (\beta = 0.38 \pm 0.02), suggesting a remarkable similarity of the aluminum oxide growth on the two substrates under the conditions employed.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:58:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Sellner", "Stefan", "" ], [ "Gerlach", "Alexander", "" ], [ "Kowarik", "Stefan", "" ], [ "Schreiber", "Frank", "" ], [ "Dosch", "Helmut", "" ], [ "Meyer", "Stephan", "" ], [ "Pflaum", "Jens", "" ], [ "Ulbricht", "Gerhard", "" ] ]
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711.502
Ian Leary
Ian J Leary
The cohomology of certain groups
PhD thesis (Cambridge, 1990) with one extra chapter added 1992
null
null
null
math.AT math.GR
null
Computations in the cohomology of finite groups.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:56:28 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J", "" ] ]
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711.5021
Vikas Anant
Vikas Anant, Ayman F. Abouraddy, Karl K. Berggren
Controlling the optical properties of transparent media by mixing active and passive resonances
null
null
null
null
physics.optics
null
Novel optical phenomena, including electromagnetically induced transparency, slow light, superluminal light propagation, have recently been demonstrated in diverse physical implementations. These phenomena are challenging to realize in practical systems because they require quantum coherence as well as careful preparation and control of prescribed quantum states. Here we present a unified approach to engineering optical materials that exhibit these phenomena by using mixtures of active and passive optical materials at frequencies near their resonances. Our approach does not depend on quantum coherence and can realize large and small (much less than 1) indices of refraction and negative permittivity ($\epsilon<0$), normal and anomalous dispersion, all while maintaining transparency.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 19:56:55 GMT" } ]
2007-12-03T00:00:00
[ [ "Anant", "Vikas", "" ], [ "Abouraddy", "Ayman F.", "" ], [ "Berggren", "Karl K.", "" ] ]
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711.5022
Maurizio Gasperini
L. Amendola, M. Gasperini and C. Ungarelli
Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction
11 pages, 1 figure eps
Phys.Rev.D77:123526,2008
10.1103/PhysRevD.77.123526
BA-TH/07-583
gr-qc astro-ph hep-th
null
A model of non-local dilaton interactions, motivated by string duality symmetries, is applied to a scenario of "coupled quintessence" in which the dilaton dark energy is non-locally coupled to the dark-matter sources. It is shown that the non-local effects tend to generate a backreaction which -- for strong enough coupling -- can automatically compensate the acceleration due to the negative pressure of the dilaton potential, thus asymptotically restoring the standard (dust-dominated) decelerated regime. This result is illustrated by analytical computations and numerical examples.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:03:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Amendola", "L.", "" ], [ "Gasperini", "M.", "" ], [ "Ungarelli", "C.", "" ] ]
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711.5023
Mikhail Dubinin
M. Dubinin (1), A. Sukachev (2) ((1) Inst. of Nucl. Phys., Moscow State Univ., (2) Physics Dept., Moscow State Univ.)
K^0 - \bar K^0, B^0 - \bar B^0 mixings in the MSSM with explicit CP violation in the Higgs sector
22 pages, 7 figures, 5 tables
Phys.Atom.Nucl.71:374-387,2008
10.1007/s11450-008-2018-3
null
hep-ph
null
We consider the K^0 - \bar K^0 and B^0 - \bar B^0 mixings in the MSSM with the two-Higgs-doublet scalar sector featuring explicit CP violation, and the Yukawa sector of type II. In the case of strong mixing between CP-odd and CP-even states the existence of light charged Higgs is allowed in the model. The mass splitting \Delta m_{LS} and the amount of indirect CP violation \epsilon are calculated. In the limit of effective low-energy approximation the nonstandard effects are shown to be negligibly small in \Delta m_{LS} and \epsilon for the K^0-mesons, being almost independent on the charged Higgs boson mass. However, for the B_d^0 - \bar B_d^0 and B_s^0 - \bar B_s^0 systems the effects of nonstandard physics are shown to be larger, limiting the MSSM parameter space.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:08:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Dubinin", "M.", "" ], [ "Sukachev", "A.", "" ] ]
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711.5024
Henk Polinder
H. Polinder
Strange two-baryon interactions using chiral effective field theory
3 pages, 2 PostScript figures, talk to appear in the proceedings of the "20th European Conference on Few-Body Problems in Physics (EFB20), Pisa, Italy, 10-14 September 2007"
Few Body Syst.44:113-115,2008
10.1007/s00601-008-0269-8
FZJ-IKP-TH-2007-32
nucl-th
null
We have constructed the leading order strangeness S=-1,-2 baryon-baryon potential in a chiral effective field theory approach. The chiral potential consists of one-pseudoscalar-meson exchanges and non-derivative four-baryon contact terms. The potential, derived using SU(3)_f symmetry constraints, contains six independent low-energy coefficients. We have solved a regularized Lippmann-Schwinger equation and achieved a good description of the available scattering data. Furthermore a correctly bound hypertriton has been obtained.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:13:12 GMT" } ]
2009-01-16T00:00:00
[ [ "Polinder", "H.", "" ] ]
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711.5025
Nicolas Doiron-Leyraud
Nicolas Doiron-Leyraud and Louis Taillefer (University of Sherbrooke)
Reply to comment by Y. Ando on "Onset of Boson Mode at the Superconducting Critical Point of Underdoped YBa$_2$Cu$_3$O$_y$" by N. Doiron-Leyraud et al
Accepted for publication in Phys. Rev. Lett
null
null
null
cond-mat.supr-con cond-mat.str-el
null
In a recent Comment [arXiv:0711.4654], Y. Ando raises two valid issues in relation to our low-temperature heat transport study of YBa$_2$Cu$_3$O$_y$ across the insulator-to-superconductor boundary: 1) the possible role of twin boundaries in scattering phonons; 2) the best fitting procedure for extracting a fermionic (linear) term from the data. In this Reply, we show that both concerns can be laid to rest by 1) using new data from a tetragonal (twin-free) sample, and 2) using an analysis that does not involve any fitting.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:21:55 GMT" } ]
2007-12-03T00:00:00
[ [ "Doiron-Leyraud", "Nicolas", "", "University of Sherbrooke" ], [ "Taillefer", "Louis", "", "University of Sherbrooke" ] ]
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711.5026
Dorothee Petit
Dorothee Petit, Ana-Vanessa Jausovec, Dan Read and Russell P. Cowburn
Domain wall pinning and potential landscapes created by constrictions and protrusions in ferromagnetic nanowires
6 pages, 7 figures
J. Appl. Phys. 103, 114307 (2007)
10.1063/1.2936981
null
cond-mat.mtrl-sci cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The potential experienced by transverse domain walls (TDWs) in the vicinity of asymmetric constrictions or protrusions in thin Permalloy nanowires is probed using spatially resolved magneto-optical Kerr effect measurements. Both types of traps are found to act as pinning centers for DWs. The strength of pinning is found to depend on the trap type as well as on the chirality of the incoming DW; both types of traps are seen to act either as potential wells or potential barriers, also depending on the chirality of the DW. Micromagnetic simulations have been performed that are in good qualitative agreement with the experimental results.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:26:35 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 18:10:44 GMT" }, { "version": "v3", "created": "Fri, 7 Nov 2008 14:37:42 GMT" } ]
2008-11-07T00:00:00
[ [ "Petit", "Dorothee", "" ], [ "Jausovec", "Ana-Vanessa", "" ], [ "Read", "Dan", "" ], [ "Cowburn", "Russell P.", "" ] ]
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711.5027
Kyle Stewart
Kyle R. Stewart (UC Irvine), James S. Bullock (UC Irvine), Risa H. Wechsler (Stanford), Ariyeh H. Maller (NYCCT), and Andrew R. Zentner (University of Pittsburgh)
Merger Histories of Galaxy Halos and Implications for Disk Survival
14 pages, 10 figures. This version accepted for publication in ApJ. v2 and v3 fixed typos and mislabels, v4 restructured and expanded the discussion section, added fitting functions to appendix, and other minor changes. Results and primary conclusions remain unchanged
Astrophys.J.683:597-610,2008
10.1086/588579
null
astro-ph
null
We study the merger histories of galaxy dark matter halos using a high resolution LCDM N-body simulation. Our merger trees follow ~17,000 halos with masses M_0 = (10^11--10^13) Msun at z=0 and track accretion events involving objects as small as m = 10^10 Msun. We find that mass assembly is remarkably self-similar in m/M_0, and dominated by mergers that are ~10% of the final halo mass. While very large mergers, m > 0.4 M_0, are quite rare, sizeable accretion events, m ~ 0.1 M_0, are common. Over the last 10 Gyr, an overwhelming majority (~95%) of Milky Way-sized halos with M_0 = 10^12 Msun have accreted at least one object with greater total mass than the Milky Way disk (m > 5x10^10 Msun), and approximately 70% have accreted an object with more than twice that mass (m > 10^11 Msun). Our results raise serious concerns about the survival of thin-disk dominated galaxies within the current paradigm for galaxy formation in a CDM universe. In order to achieve a ~70% disk-dominated fraction in Milky Way-sized CDM halos, mergers involving m ~ 2x10^11 Msun objects must not destroy disks. Considering that most thick disks and bulges contain old stellar populations, the situation is even more restrictive: these mergers must not heat disks or drive gas into their centers to create young bulges.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:56:39 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 22:43:46 GMT" }, { "version": "v3", "created": "Tue, 4 Dec 2007 08:00:44 GMT" }, { "version": "v4", "created": "Mon, 31 Mar 2008 20:14:12 GMT" } ]
2010-11-05T00:00:00
[ [ "Stewart", "Kyle R.", "", "UC Irvine" ], [ "Bullock", "James S.", "", "UC Irvine" ], [ "Wechsler", "Risa H.", "", "Stanford" ], [ "Maller", "Ariyeh H.", "", "NYCCT" ], [ "Zentner", "Andrew R.", "", "University of Pittsburgh" ] ]
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711.5028
Bjorn Poonen
Bjorn Poonen
The p-adic closure of a subgroup of rational points on a commutative algebraic group
7 pages
null
null
null
math.NT math.AG
null
Let G be a commutative algebraic group over Q. Let Gamma be a subgroup of G(Q) contained in the union of the compact subgroups of G(Q_p). We formulate a guess for the dimension of the closure of Gamma in G(Q_p), and show that its correctness for certain tori is equivalent to Leopoldt's conjecture.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:57:31 GMT" } ]
2007-12-03T00:00:00
[ [ "Poonen", "Bjorn", "" ] ]
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711.5029
Tsz Yan Lam
T. Y. Lam and R. K. Sheth
Perturbation theory and excursion set estimates of the probability distribution function of dark matter, and a method for reconstructing the initial distribution function
12 pages, 6 figures; Figures and texts modified; accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13038.x
null
astro-ph
null
Nonlinear evolution can sometimes be modelled by a deterministic mapping from initial to final of the local smoothed overdensity. Perturbation theory methods base on this deterministic and local mapping and ignore the 'cloud-in-cloud' effect, while the excursion set approach methods take this nonlocality into account. We compared these methods using the spherical collapse mapping and showed that, on scales where the rms fluctuation is small, both models give similar results and they are in good agreement with numerical simulations. If the deterministic mapping depends on quantities other than overdensity, this will also manifest as stochasticity if the other quantities are ignored. We considered the Zeldovich approximation and Ellipsoidal Collapse model, both include the tidal field in the evolution. Our anaylsis shows that the change in cell shape effect should be included on scales where the rms is of order of unity or larger. On scales where the rms is less than 2 methods based on the spherical collapse model allow a rather accurate reconstruction of the shape of the initial distribution from the nonlinear field. This can be used as the basis for constraining the statistical properties of the initial fluctuation field. (Abridge)
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:57:49 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 20:11:49 GMT" } ]
2008-03-18T00:00:00
[ [ "Lam", "T. Y.", "" ], [ "Sheth", "R. K.", "" ] ]
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712.0001
Nobuki Takayama
Francisco Jesus Castro-Jimenez and Nobuki Takayama
The Computation of the Logarithmic Cohomology for Plane Curves
19 pages
null
null
null
math.AG
null
We give algorithms of computing bases of logarithmic cohomology groups for square-free polynomials in two variables. (Fixed typos of v1)
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:02:49 GMT" }, { "version": "v2", "created": "Sun, 20 Jan 2008 06:47:15 GMT" } ]
2008-01-20T00:00:00
[ [ "Castro-Jimenez", "Francisco Jesus", "" ], [ "Takayama", "Nobuki", "" ] ]
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712.0002
Raouf Dridi
Raouf Dridi and Michel Petitot
New classification techniques for ordinary differential equations
This JSC journal version of the ISSAC07 paper
null
null
null
math.DG
null
The goal of the present paper is to propose an enhanced ordinary differential equations solver by exploitation of the powerful equivalence method of \'Elie Cartan. This solver returns a target equation equivalent to the equation to be solved and the transformation realizing the equivalence. The target ODE is a member of a dictionary of ODE, that are regarded as well-known, or at least well-studied. The dictionary considered in this article are ODE in a book of Kamke. The major advantage of our solver is that the equivalence transformation is obtained without integrating differential equations. We provide also a theoretical contribution revealing the relationship between the change of coordinates that maps two differential equations and their symmetry pseudo-groups.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:05:52 GMT" }, { "version": "v2", "created": "Fri, 30 May 2008 23:59:12 GMT" } ]
2008-05-31T00:00:00
[ [ "Dridi", "Raouf", "" ], [ "Petitot", "Michel", "" ] ]
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712.0003
Jacqueline Chen
Jacqueline Chen (AIfA)
The Galaxy Cross-Correlation Function as a Probe of the Spatial Distribution of Galactic Satellites
11 pages, 4 figures, A&A accepted version. Includes tests of method not included in v1
Astron.Astrophys.494:867-877,2009
10.1051/0004-6361:20079184
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spatial distribution of satellite galaxies around host galaxies can illuminate the relationship between satellites and dark matter subhalos and aid in developing and testing galaxy formation models. Previous efforts to constrain the distribution attempted to eliminate interlopers from the measured projected number density of satellites and found that the distribution is generally consistent with the expected dark matter halo profile of the parent hosts, with a best-fit power-law slope of ~ -1.7 between projected separations of ~30 kpc/h and 0.5 Mpc/h. Here, I use the projected cross-correlation of bright and faint galaxies to analyze contributions from satellites and interlopers together, using a halo occupation distribution (HOD) analytic model for galaxy clustering. This approach is tested on mock catalogs constructed from simulations. I find that analysis of Sloan Digital Sky Survey (SDSS) data gives results generally consistent with interloper subtraction methods between the projected separations of 10 kpc/h and 6.3 Mpc/h, although the errors on the parameters that constrain the radial profile are large, and larger samples of data are required.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 16:50:53 GMT" }, { "version": "v2", "created": "Mon, 12 Jan 2009 13:59:09 GMT" } ]
2009-06-23T00:00:00
[ [ "Chen", "Jacqueline", "", "AIfA" ] ]
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712.0004
Evgenya Shkolnik
Evgenya Shkolnik (University of Hawaii), David A. Bohlender (Herzberg Institute of Astrophysics, NRC), Gordon A.H. Walker (University of British Columbia), Andrew Collier Cameron (University of St. Andrews)
The On/Off Nature of Star-Planet Interactions
Accepted for publication in the Astrophysical Journal
null
10.1086/527351
null
astro-ph
null
Evidence suggesting an observable magnetic interaction between a star and its hot Jupiter appears as a cyclic variation of stellar activity synchronized to the planet's orbit. In this study, we monitored the chromospheric activity of 7 stars with hot Jupiters using new high-resolution echelle spectra collected with ESPaDOnS over a few nights in 2005 and 2006 from the CFHT. We searched for variability in several stellar activity indicators (Ca II H, K, the Ca II infrared triplet, Halpha, and He I). HD 179949 has been observed almost every year since 2001. Synchronicity of the Ca II H & K emission with the orbit is clearly seen in four out of six epochs, while rotational modulation with P_rot=7 days is apparent in the other two seasons. We observe a similar phenomenon on upsilon And, which displays rotational modulation (P_rot=12 days) in September 2005, in 2002 and 2003 variations appear to correlate with the planet's orbital period. This on/off nature of star-planet interaction (SPI) in the two systems is likely a function of the changing stellar magnetic field structure throughout its activity cycle. Variability in the transiting system HD 189733 is likely associated with an active region rotating with the star, however, the flaring in excess of the rotational modulation may be associated with its hot Jupiter. As for HD 179949, the peak variability as measured by the mean absolute deviation for both HD 189733 and tau Boo leads the sub-planetary longitude by 70 degrees. The tentative correlation between this activity and the ratio of Mpsini to the planet's rotation period, a quantity proportional to the hot Jupiter's magnetic moment, first presented in Shkolnik et al. 2005 remains viable. This work furthers the characterization of SPI, improving its potential as a probe of extrasolar planetary magnetic fields.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:08:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Shkolnik", "Evgenya", "", "University of Hawaii" ], [ "Bohlender", "David A.", "", "Herzberg\n Institute of Astrophysics, NRC" ], [ "Walker", "Gordon A. H.", "", "University of British\n Columbia" ], [ "Cameron", "Andrew Collier", "", "University of St. Andrews" ] ]
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712.0005
Sungho Han
Sungho Han, Pradeep Kumar, and H. Eugene Stanley
Absence of a Diffusion Anomaly in Water Perpendicular to Hydrophobic Nanoconfining Walls
null
null
10.1103/PhysRevE.77.030201
null
cond-mat.soft cond-mat.stat-mech
null
We perform molecular dynamics simulations to investigate the diffusive motion of TIP5P water in the direction perpendicular to the two hydrophobic confining walls. To calculate the diffusion coefficient, we use the concept of the characteristic residence time which is calculated from the exponential decay of the residence time probability distribution function. We find that a diffusion anomaly of water, increase of diffusion upon compression, is absent in the direction perpendicular to the confining walls down to the lowest temperature we simulate, 220K, whereas there is a diffusion anomaly, similar to that in bulk water, in the direction parallel to the walls. The absence of a diffusion anomaly may arise mainly due to nanoconfinement, rather than due to the hydrophobic property of the confining walls.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:15:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Han", "Sungho", "" ], [ "Kumar", "Pradeep", "" ], [ "Stanley", "H. Eugene", "" ] ]
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712.0006
Stephane Job
Stephane Job (1), Francisco Melo (2), Adam Sokolow (3), Surajit Sen (3) ((1) Supmeca Paris France, (2) Usach-Cimat Santiago de Chile, (3) Suny New York USA)
Solitary wave trains in granular chains: Experiments, theory and simulations
The original publication is available at http://www.springerlink.com (related papers at http://www.supmeca.fr/perso/jobs)
Granular Matter, vol. 10-1, pp. 13-20, December 2007
10.1007/s10035-007-0054-2
null
cond-mat.soft cond-mat.mtrl-sci
null
The features of solitary waves observed in horizontal monodisperse chain of barely touching beads not only depend on geometrical and material properties of the beads but also on the initial perturbation provided at the edge of the chain. An impact of a large striker on a monodisperse chain, and similarly a sharp decrease of bead radius in a stepped chain, generates a solitary wave train containing many single solitary waves ordered by decreasing amplitudes. We find, by simple analytical arguments, that the unloading of compression force at the chain edge has a nearly exponential decrease. The characteristic time is mainly a function involving the grains' masses and the striker mass. Numerical calculations and experiments corroborate these findings.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:05:41 GMT" } ]
2007-12-04T00:00:00
[ [ "Job", "Stephane", "" ], [ "Melo", "Francisco", "" ], [ "Sokolow", "Adam", "" ], [ "Sen", "Surajit", "" ] ]
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712.0007
Tim M. P. Tait
Yonatan Kahn, Michael Schmitt, Tim Tait
Enhanced Rare Pion Decays from a Model of MeV Dark Matter
4 pages, 2 figures. Version published in PRD. V3: fixed a misplaced figure
Phys.Rev.D78:115002,2008
10.1103/PhysRevD.78.115002
NUHEP-EXP/07-12
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A model has been proposed in which neutral scalar particles chi, of mass 1-10 MeV, annihilate through the exchange of a light vector boson U, of mass 10-100 MeV, to produce the 511 keV line observed emanating from the center of the galaxy. The chi interacts weakly with normal matter and is a viable dark matter candidate. If the U-boson couples to quarks as well as to electrons, it could enhance the branching ratio for the rare decay pi0 -> e+e-. A recent measurement by the KTeV Collaboration lies three standard deviations above a prediction by Dorokhov and Ivanov, and we relate this excess to the couplings of the U-boson. The values are consistent with other constraints and considerations. We make some comments on possible improvements in the data.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:19:53 GMT" }, { "version": "v2", "created": "Mon, 8 Jun 2009 03:21:44 GMT" }, { "version": "v3", "created": "Thu, 24 May 2012 18:04:05 GMT" } ]
2012-05-25T00:00:00
[ [ "Kahn", "Yonatan", "" ], [ "Schmitt", "Michael", "" ], [ "Tait", "Tim", "" ] ]
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712.0008
Alessio Celi
Alessio Celi
Neither black-holes nor regular solitons: a no-go theorem
23 pages, v2: minor changes, references added
Int.J.Mod.Phys.A24:1901-1923,2009
10.1142/S0217751X09042979
null
hep-th
null
By studying the BPS equations for electrostatic and spherically symmetric configurations in N=2, d=5 gauged supergravity with vector multiplets and hypermultiplets coupled, we demonstrate that no regular supersymmetric black-hole solutions of this kind exist. Furthermore, we demonstrate that it is not possible to construct supersymmetric regular solitons that have the above symmetries. As a consequence the scalar flow associated to the BPS solutions is always unbounded.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 11:21:21 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 16:54:17 GMT" } ]
2009-04-21T00:00:00
[ [ "Celi", "Alessio", "" ] ]
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712.0009
Feryal Ozel
Feryal Ozel, Tolga Guver, and Ersin Gogus
The Magnetic Fields of Anomalous X-ray Pulsars
5 pages, 5 figures. To appear in the proceedings of "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 2007, McGill University, Montreal, Canada
AIP Conf.Proc.983:254-258,2008
10.1063/1.2900155
null
astro-ph
null
Anomalous X-ray Pulsars (AXPs) belong to a class of neutron stars believed to harbor the strongest magnetic fields in the universe, as indicated by their energetic bursts and their rapid spindowns. We have developed a theoretical model that takes into account processes in the atmospheres and magnetospheres of ultramagnetic neutron stars, as well as the effects of their strong gravitational fields on the observable properties. Using this model, we have analyzed the X-ray spectra of a number of AXPs. We find that in all cases, the X-ray spectra are described very well with this emission model. The spectroscopically measured magnetic field strengths of these sources are in close agreement with the values inferred from their spindown properties and provide independent evidence for their magnetar nature. The analysis of spectral data using this physical model also sheds light on the long-term evolution of AXPs.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:31:58 GMT" } ]
2009-06-23T00:00:00
[ [ "Ozel", "Feryal", "" ], [ "Guver", "Tolga", "" ], [ "Gogus", "Ersin", "" ] ]
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712.001
Dirk Pleiter
M. G\"ockeler, Philipp H\"agler, R. Horsley, Y. Nakamura, M. Ohtani, D. Pleiter, P.E.L. Rakow, A. Sch\"afer, G. Schierholz, W. Schroers, H. St\"uben, J.M. Zanotti
Probing the chiral limit with clover fermions II: The baryon sector
7 pages, Contribution to Lattice 2007, Regensburg, Germany, 30 July - 4 August 2007
PoSLAT2007:129,2007
null
DESY 07/178, Edinburgh 2007/29
hep-lat
null
Algorithmic progress in recent years made it possible to simulate QCD with Nf=2 flavours of O(a)-improved Wilson fermions at very light quark masses. We present the current results for baryon spectrum states, the nucleon axial coupling and the lowest moment of unpolarised nucleon structure functions. Special emphasis is given to a comparison of our calculations with results from chiral effective theories.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:34:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Göckeler", "M.", "" ], [ "Hägler", "Philipp", "" ], [ "Horsley", "R.", "" ], [ "Nakamura", "Y.", "" ], [ "Ohtani", "M.", "" ], [ "Pleiter", "D.", "" ], [ "Rakow", "P. E. L.", "" ], [ "Schäfer", "A.", "" ], [ "Schierholz", "G.", "" ], [ "Schroers", "W.", "" ], [ "Stüben", "H.", "" ], [ "Zanotti", "J. M.", "" ] ]
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712.0011
Alexander Olemskoi
A.I. Olemskoi, S.V. Kokhan, V.I. Ostrik
Complexity of hierarchical ensembles
12 pages, 10 figures
null
null
null
cond-mat.stat-mech
null
Within the framework of generalized combinatorial approach, complexity is determined as a disorder measure for hierarchical statistical ensembles related to Cayley trees possessing arbitrary branching and number of levels. With strengthening hierarchical coupling, the complexity is shown to increase monotonically to the limit value that grows with tree branching. In contrast to the temperature dependence of thermodynamic entropy, the complexity is reduced by the variance of hierarchical statistical ensemble if the branching exponent does not exceed the gold mean. Time dependencies are found for both the probability distribution over ensemble states and the related complexity. The latter is found explicitly for self-similar ensemble and generalized for arbitrary hierarchical trees.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 08:56:02 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 16:42:22 GMT" }, { "version": "v3", "created": "Wed, 20 Feb 2008 12:38:05 GMT" }, { "version": "v4", "created": "Thu, 21 Feb 2008 07:32:52 GMT" } ]
2008-02-21T00:00:00
[ [ "Olemskoi", "A. I.", "" ], [ "Kokhan", "S. V.", "" ], [ "Ostrik", "V. I.", "" ] ]
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712.0012
Christophe Pinte
C. Pinte, F. Menard, J.P. Berger, M. Benisty, F. Malbet
The inner radius of T Tauri disks estimated from near-infrared interferometry: the importance of scattered light
4 pages, 4 figures, accepted for publication in ApJL
null
10.1086/527378
null
astro-ph
null
For young Herbig Ae/Be stars, near-infrared interferometric measurements have revealed a correlation between the luminosity of the central object and the position of the disk inner rim. This correlation breaks down for the cooler T Tauri stars, a fact often interpreted in terms of disks with larger inner radii. In most cases, the conversion between the observed interferometric visibility and the calculated disk inner radius was done with a crude disk emission model. Here, we examine how the use of models that neglect scattered light can lead to an overestimation of the disk sizes. To do so, synthetic disk images (and visibilities) are calculated with a full treatment of the radiative transfer. The relative contributions of thermal emission and scattered light are compared. We find that the latter can not be neglected for cool stars. For further comparison, the model visibilities are also converted into inner disk radii using the same simple disk models as found in the literature. We find that reliable inner radii can only be estimated for Herbig Ae/Be stars with these models. However, they lead to a systematic overestimation of the disk size, by a factor of 2 to 3, for T Tauri stars. We suggest that including scattered light in the models is a simple (and sufficient) explanation of the current interferometric measurements of T Tauri stars.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:48:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Pinte", "C.", "" ], [ "Menard", "F.", "" ], [ "Berger", "J. P.", "" ], [ "Benisty", "M.", "" ], [ "Malbet", "F.", "" ] ]
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712.0013
Renato Higa
Renato Higa
Coulomb interactions within Halo Effective Field Theory
Talk given at the 20th European Conference on Few-Body Problems in Physics, Pisa, Italy, September 10-14, 2007
Few Body Syst.44:125-127,2008
10.1007/s00601-008-0272-0
null
nucl-th
null
I present preliminary results of effective field theory applied to nuclear cluster systems, where Coulomb interactions play a significant role.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:51:59 GMT" } ]
2009-01-16T00:00:00
[ [ "Higa", "Renato", "" ] ]
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712.0014
N. L. Harshman
N.L. Harshman and P. Singh
Entanglement Mechanisms in One-Dimensional Potential Scattering
14 pages IOP style, 5 figures, conference proceeding for QTS-5; version 2 has some clarifications, corrections, and general improvements; submitted to JPA
J. Phys. A: Math. Theor. 41 (2008) 155304.
10.1088/1751-8113/41/15/155304
null
quant-ph
null
When two non-relativistic particles scatter in one dimension, they can become entangled. This entanglement process is constrained by the symmetries of the scattering system and the boundary conditions on the incoming state. Applying these constraints, three different mechanisms of entanglement can be identified: the superposition of reflected and transmitted modes, momentum correlations of the reflected mode due to inversion of the relative momentum, and momentum correlations in the transmitted and reflected modes due to dependence of the scattering amplitude on the relative momentum. We consider three standard potentials, the hard core, Dirac delta, and double Dirac delta, and show that the relative importance of these mechanisms depends on the interaction and on the properties of the incoming wave function. We find that even when the momenta distributions of the incoming articles are sharply peaked, entanglement due to the momentum correlations generated by reflection can be quite large for particles with unequal mass.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 21:59:21 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 23:28:47 GMT" } ]
2015-05-13T00:00:00
[ [ "Harshman", "N. L.", "" ], [ "Singh", "P.", "" ] ]
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712.0015
Antonello Scardicchio
P. Facchi, U. Marzolino, G. Parisi, S. Pascazio, A. Scardicchio
Phase transitions of bipartite entanglement
5 pages, 3 figures
Phys. Rev. Lett. 101, 050502 (2008)
10.1103/PhysRevLett.101.050502
null
quant-ph cond-mat.stat-mech hep-th
null
We study a random matrix model for the statistical properties of the purity of a bipartite quantum system at a finite (fictitious) temperature. This enables us to write the generating function for the cumulants, for both balanced and unbalanced bipartitions. It also unveils an unexpected feature of the system, namely the existence of two phase transitions, characterized by different spectra of the density matrices. One of the critical phases is described by the statistical mechanics of random surfaces, the other is a second-order phase transition.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 22:14:37 GMT" }, { "version": "v2", "created": "Sat, 29 Mar 2008 20:25:33 GMT" } ]
2010-01-30T00:00:00
[ [ "Facchi", "P.", "" ], [ "Marzolino", "U.", "" ], [ "Parisi", "G.", "" ], [ "Pascazio", "S.", "" ], [ "Scardicchio", "A.", "" ] ]
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712.0016
Bob McElrath
Bob McElrath
Light Higgses and Dark Matter at Bottom and Charm Factories
7 pages, 3 figures, Contribution to the Proceedings of the CHARM 2007 Workshop, Ithaca, NY, August 5-8, 2007
ECONF C070805:19,2007
null
eConf C070805
hep-ph hep-ex
null
Neither Dark Matter nor scalar particles in the Higgs sector are ruled out at energies accessible to bottom and charm factories. In Dark Matter searches, the error on the mass of Dark Matter is $\sim 4$ GeV in the best LHC studies. For light Dark Matter this could represent a 100% (or more) error. In Higgs searches, the presence of a light singlet Higgs can make the LHC Higgs search difficult, if not impossible. If Dark Matter or a Higgs scalar is light, it will {\it require} a low-energy machine to precisely determine the couplings. We review the models, modes of discovery and rate expectations for these new particle searches at bottom and charm factories. We also discuss the options for new runs at bottom and charm factories relevant for these searches.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 20:56:48 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 07:21:48 GMT" } ]
2011-06-15T00:00:00
[ [ "McElrath", "Bob", "" ] ]
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712.0017
Robert Smith Ph. D
Robert E. Smith (UZurich), Ravi K. Sheth (UPenn), Roman Scoccimarro (NYU)
An analytic model for the bispectrum of galaxies in redshift space
Submitted to the PRD. 28 pages, 7 Figs. Comparison with numerical simulations improved and expanded. Analytic model predictions improved on large scales. Errors corrected in bispectrum estimator for redshift space Q. Other changes made in line with referees report
Phys.Rev.D78:023523,2008
10.1103/PhysRevD.78.023523
null
astro-ph
null
We develop an analytic theory for the redshift space bispectrum of dark matter, haloes and galaxies. This is done within the context of the halo model of structure formation, as this allows for the self-consistent inclusion of linear and non-linear redshift space distortions and also for the non-linearity of the halo bias. The model is applicable over a wide range of scales: on the largest scales the predictions reduce to those of the standard perturbation theory (PT); on smaller scales they are determined primarily by the nonlinear virial velocities of galaxies within haloes, and this gives rise to the U-shaped anisotropy in the reduced bispectrum -- a finger print of the Finger-Of-God distortions. We then confront the predictions with bispectrum measurements from an ensemble of numerical simulations. On very large scales, k=0.05 h/Mpc, we find reasonably good agreement between our Halo Model, PT and the data, to within the errors. On smaller scales, k=0.1 h/Mpc, the measured bispectra differ from the PT at the level of 10-20%, especially for colinear triangle configurations. The Halo Model predictions improve over PT, but are accurate to no better than 10%. On smaller scales k=0.5-1.0 h/Mpc, our model provides a significant improvement over PT, which breaks down. This implies that studies which use the lowest order PT to extract galaxy bias information are not robust on scales k>0.1 h/Mpc. The analytic and simulation results also indicate that there is no observable scale for which the configuration dependence of the reduced bispectrum is constant--hierarchical models for the higher order correlation functions in redshift space are unlikely to be useful. It is hoped that our model will facilitate extraction of information from large-scale structure surveys of the Universe.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 20:59:36 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 17:26:12 GMT" } ]
2008-12-18T00:00:00
[ [ "Smith", "Robert E.", "", "UZurich" ], [ "Sheth", "Ravi K.", "", "UPenn" ], [ "Scoccimarro", "Roman", "", "NYU" ] ]
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712.0018
Leonid Petrov
Leonid Petrov
On observability of the free core nutation
Submitted to the Proceedings of Journees 2007 Systemes de reference spatio-temporels, 4 pages, 2 figures
Proceedings of Journees 2007 Systemes de reference spatio-temporels, ed. by N. Capitaine, 2008, p. 99-102
null
null
physics.geo-ph
null
Neither astronomical technique, including VLBI, can measure nutation directly. Estimates of parameters of the nutation model are produced by solving the LSQ problem of adjusting millions parameters using estimates of group delay. The choice of the mathematical model for nutation used in the estimation process of analysis of group delays affects our ability to interpret the results. Ignoring these subtleties and using parameters of the nutation model either in the form of time series, or in the form of empirical expansion as "VLBI measurement of nutation", opens a room for misinterpretation and mistakes. Detailed analysis of the problem reveals that the separation of forced nutations, atmospheric nutations, ocean nutations, and the retrograde free core nutation requires invoking some hypotheses, and beyond a specific level becomes uncertain. This sets a limit of our ability to make an inference about the free core nutation.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 22:32:22 GMT" } ]
2010-12-14T00:00:00
[ [ "Petrov", "Leonid", "" ] ]
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712.0019
Fred Cooperstock I
F.I. Cooperstock, S. Tieu
General relativistic velocity: the alternative to dark matter
12 pages, 2 figures
Mod.Phys.Lett.A23:1745-1755,2008
10.1142/S0217732308027163
null
astro-ph gr-qc hep-th
null
We consider the gravitational collapse of a spherically symmetric ball of dust in the general relativistic weak gravity regime. The velocity of the matter as viewed by external observers is compared to the velocity gauged by local observers. While the comparison in the case of very strong gravity is seen to follow the pattern familiar from studies of test particles falling towards a concentrated mass, the case of weak gravity is very different. The velocity of the dust that is witnessed by external observers is derived for the critically open case and is seen to differ markedly from the expectations based upon Newtonian gravity theory. Viewed as an idealized model for a cluster of galaxies, we find that with the general relativistic velocity expression, the higher-than-expected constituent velocities observed can be readily correlated with the solely baryonic measure of the mass, obviating the need to introduce extraneous dark matter. Hitherto unexplained and subject-to-reinterpretation astrophysical phenomena could also be considered within this context. It is suggested that an attempt be made to formulate an experimental design at smaller scales simulating or realizing a collapse with the aim of implementing a new test of general relativity.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 22:48:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Cooperstock", "F. I.", "" ], [ "Tieu", "S.", "" ] ]
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712.002
Brian Benson
Brian A. Benson
The Structure of a Bernoulli Process Variation of the Fibonacci Sequence
22 pages, 1 figure
null
null
null
math.HO
null
We consider the structure of a variation of the Fibonacci sequence which is determined by a Bernoulli process. The associated structure of all Bernoulli variations of the Fibonacci sequence can be represented by a directed binary tree, which we denote X, with vertex labels representing the specific state of the recurrence variation. Since X is a binary tree, we can consider the term of a sequence variation given by a finite traversal of X represented by a binary code t. We then prove that the traversal of X that is the reflection of the digits of t gives exactly the integer term corresponding to t. We consider how to further this result with the statement of an additional conjecture. Finally, we give connections to Fibonacci expansions, the Stern-Brocot tree, and we apply our methods to the Three Hat Problem as seen in ``Puzzle Corner'' of the ``Technology Review'' magazine.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 22:57:27 GMT" } ]
2007-12-04T00:00:00
[ [ "Benson", "Brian A.", "" ] ]
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712.0021
Kenneth Hanson
Kenneth M. Hanson
Lessons about likelihood functions from nuclear physics
presented at 27th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (Maxent 2007), 10 pages, 12 figures
null
10.1063/1.2821298
LA-UR-07-5405
nucl-ex
null
Least-squares data analysis is based on the assumption that the normal (Gaussian) distribution appropriately characterizes the likelihood, that is, the conditional probability of each measurement d, given a measured quantity y, p(d | y). On the other hand, there is ample evidence in nuclear physics of significant disagreements among measurements, which are inconsistent with the normal distribution, given their stated uncertainties. In this study the histories of 99 measurements of the lifetimes of five elementary particles are examined to determine what can be inferred about the distribution of their values relative to their stated uncertainties. Taken as a whole, the variations in the data are somewhat larger than their quoted uncertainties would indicate. These data strongly support using a Student t distribution for the likelihood function instead of a normal. The most probable value for the order of the t distribution is 2.6 +/- 0.9. It is shown that analyses based on long-tailed t-distribution likelihoods gracefully cope with outlying data.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:16:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Hanson", "Kenneth M.", "" ] ]
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712.0022
Gregory Brunner
G. Brunner, K. Sheth, L. Armus, M. Wolfire, S. Vogel, E. Schinnerer, G. Helou, R. Dufour, J. Smith, D. Dale
Warm Molecular Gas in M51: Mapping the Excitation Temperature and Mass of H_2 with the Spitzer Infrared Spectrograph
null
null
10.1086/524348
null
astro-ph
null
We have mapped the warm molecular gas traced by the H_2 S(0) - H_2 S(5) pure rotational mid-infrared emission lines over a radial strip across the nucleus and disk of M51 (NGC 5194) using the Infrared Spectrograph (IRS) on the Spitzer Space Telescope. The six H_2 lines have markedly different emission distributions. We obtained the H_2 temperature and surface density distributions by assuming a two temperature model: a warm (T = 100 - 300 K) phase traced by the low J (S(0) - S(2)) lines and a hot phase (T = 400 - 1000 K) traced by the high J (S(2) - S(5)) lines. The lowest molecular gas temperatures are found within the spiral arms (T ~ 155 K), while the highest temperatures are found in the inter-arm regions (T > 700 K). The warm gas surface density reaches a maximum of 11 M_sun/pc^2 in the northwestern spiral arm, whereas the hot gas surface density peaks at 0.24 M_sun/pc^2 at the nucleus. The spatial offset between the peaks in the warm and hot phases and the differences in the distributions of the H_2 line emission suggest that the warm phase is mostly produced by UV photons in star forming regions while the hot phase is mostly produced by shocks or X-rays associated with nuclear activity. The warm H_2 is found in the dust lanes of M51, spatially offset from the brightest HII regions. The warm H_2 is generally spatially coincident with the cold molecular gas traced by CO (J = 1 - 0) emission, consistent with excitation of the warm phase in dense photodissociation regions (PDRs). In contrast, the hot H_2 is most prominent in the nuclear region. Here, over a 0.5 kpc radius around the nucleus of M51, the hot H_2 coincides with [O IV](25.89 micron) and X-ray emission indicating that shocks and/or X-rays are responsible for exciting this phase.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 22:53:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Brunner", "G.", "" ], [ "Sheth", "K.", "" ], [ "Armus", "L.", "" ], [ "Wolfire", "M.", "" ], [ "Vogel", "S.", "" ], [ "Schinnerer", "E.", "" ], [ "Helou", "G.", "" ], [ "Dufour", "R.", "" ], [ "Smith", "J.", "" ], [ "Dale", "D.", "" ] ]
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712.0023
Karel Schrijver
C.J. Schrijver, M.L. DeRosa, T. Metcalf, G. Barnes, B. Lites, T. Tarbell, J. McTiernan, G. Valori, T. Wiegelmann, M.S. Wheatland, T. Amari, G. Aulanier, P. Demoulin, M. Fuhrmann, K. Kusano, S. Regnier, and J.K. Thalmann
Non-linear force-free field modeling of a solar active region around the time of a major flare and coronal mass ejection
null
null
10.1086/527413
null
astro-ph
null
Solar flares and coronal mass ejections are associated with rapid changes in field connectivity and powered by the partial dissipation of electrical currents in the solar atmosphere. A critical unanswered question is whether the currents involved are induced by the motion of pre-existing atmospheric magnetic flux subject to surface plasma flows, or whether these currents are associated with the emergence of flux from within the solar convective zone. We address this problem by applying state-of-the-art nonlinear force-free field (NLFFF) modeling to the highest resolution and quality vector-magnetographic data observed by the recently launched Hinode satellite on NOAA Active Region 10930 around the time of a powerful X3.4 flare. We compute 14 NLFFF models with 4 different codes and a variety of boundary conditions. We find that the model fields differ markedly in geometry, energy content, and force-freeness. We discuss the relative merits of these models in a general critique of present abilities to model the coronal magnetic field based on surface vector field measurements. For our application in particular, we find a fair agreement of the best-fit model field with the observed coronal configuration, and argue (1) that strong electrical currents emerge together with magnetic flux preceding the flare, (2) that these currents are carried in an ensemble of thin strands, (3) that the global pattern of these currents and of field lines are compatible with a large-scale twisted flux rope topology, and (4) that the ~10^32 erg change in energy associated with the coronal electrical currents suffices to power the flare and its associated coronal mass ejection.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:00:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Schrijver", "C. J.", "" ], [ "DeRosa", "M. L.", "" ], [ "Metcalf", "T.", "" ], [ "Barnes", "G.", "" ], [ "Lites", "B.", "" ], [ "Tarbell", "T.", "" ], [ "McTiernan", "J.", "" ], [ "Valori", "G.", "" ], [ "Wiegelmann", "T.", "" ], [ "Wheatland", "M. S.", "" ], [ "Amari", "T.", "" ], [ "Aulanier", "G.", "" ], [ "Demoulin", "P.", "" ], [ "Fuhrmann", "M.", "" ], [ "Kusano", "K.", "" ], [ "Regnier", "S.", "" ], [ "Thalmann", "J. K.", "" ] ]
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712.0024
Paulo C. Freire
Paulo C. C. Freire
Super-Massive Neutron Stars
5 pages, one table, 2 figures. To appear in the proceedings of "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007, McGill University, Montreal, Canada
AIPConf.Proc.983:459-463,2008
10.1063/1.2900274
null
astro-ph
null
We present here the results of Arecibo timing of PSR B1516+02B, a 7.95-ms pulsar in a binary system with a ~0.17 solar mass companion and an orbital period of 6.85 days located in the globular cluster M5. The eccentricity of the orbit (e = 0.14) has allowed a measurement of the rate of advance of periastron: (0.0136 +/- 0.0007) degrees per year. It is very likely that the periastron advance is due to the effects of general relativity; the total mass of the binary system is (2.14 +/-0.16) solar masses. The small measured mass function implies, in a statistical sense, that a very large fraction of this total mass is contained in the pulsar: (1.94+0.17 -0.19) solar masses (1-sigma); there is a 5% probability that the mass of this object is below 1.59 solar masses. With the possible exception of PSR J1748-2021B, this is the largest neutron star mass measured to date. When combined with similar measurements made previously for Terzan 5 I and J, we can exclude, in a statistical sense, the ``soft'' equations of state for dense neutron matter, implying that matter at the center of a neutron star is highly incompressible. There is also some evidence for a bimodal distribution of MSP masses, the reasons for that are not clear.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:57:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Freire", "Paulo C. C.", "" ] ]
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712.0025
Silvia Faggian PhD
Silvia Faggian
Equilibrium points for Optimal Investment with Vintage Capital
null
null
null
null
math.OC
null
The paper concerns the study of equilibrium points, namely the stationary solutions to the closed loop equation, of an infinite dimensional and infinite horizon boundary control problem for linear partial differential equations. Sufficient conditions for existence of equilibrium points in the general case are given and later applied to the economic problem of optimal investment with vintage capital. Explicit computation of equilibria for the economic problem in some relevant examples is also provided. Indeed the challenging issue here is showing that a theoretical machinery, such as optimal control in infinite dimension, may be effectively used to compute solutions explicitly and easily, and that the same computation may be straightforwardly repeated in examples yielding the same abstract structure. No stability result is instead provided: the work here contained has to be considered as a first step in the direction of studying the behavior of optimal controls and trajectories in the long run.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 00:01:54 GMT" } ]
2007-12-04T00:00:00
[ [ "Faggian", "Silvia", "" ] ]
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712.0026
Michael A. Reid
Michael A. Reid and Brenda C. Matthews
Deconstructing the High-Mass Star-Forming Region IRAS 23033+5951
Accepted for publication in the Astrophysical Journal
null
10.1086/527408
null
astro-ph
null
We report interferometric observations of the high-mass star-forming object IRAS 23033+5951. Our observations reveal two massive molecular cloud cores, designated IRAS 23033+5951-MMS1 and IRAS 23033+5951-MMS2. MMS1 has already formed a massive protostar and MMS2 appears to be on the verge of doing so. The latter core may be an example of a massive analogue to a "Class 0" star-forming object. The more evolved core shows some evidence of N2H+ destruction near the protostar, consistent with similar findings in low-mass star-forming objects. In addition to the already-known prominent HCO+ outflow, our SiO 2--1, and CH3OH 2--1 maps show evidence for two more candidate outflows, both presumably less powerful than the main one. Both cores are embedded in an elongated feature whose major axis is oriented almost exactly perpendicular to the axis of the most prominent outflow in the region. Although it has many of the characteristics of a disk, the 87,000 AU (0.42 pc) diameter of this structure suggests that it is more likely to be the flattened, rotating remnant of the natal molecular cloud fragment from which the star-forming cores condensed. We conclude that IRAS 23033+5951 is an excellent example of massive star formation proceeding in relative isolation, perhaps by the method of monolithic collapse and disk accretion.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:34:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Reid", "Michael A.", "" ], [ "Matthews", "Brenda C.", "" ] ]
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712.0027
Christophe Weibel
Komei Fukuda, Christophe Weibel
A linear equation for Minkowski sums of polytopes relatively in general position
10 pages, accepted by Europ. J. Combinatorics
null
null
null
math.CO
null
The objective of this paper is to study a special family of Minkowski sums, that is of polytopes relatively in general position. We show that the maximum number of faces in the sum can be attained by this family. We present a new linear equation that is satisfied by f-vectors of the sum and the summands. We study some of the implications of this equation.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:39:18 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 16:10:56 GMT" } ]
2008-04-28T00:00:00
[ [ "Fukuda", "Komei", "" ], [ "Weibel", "Christophe", "" ] ]
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712.0028
Oleg Eroshkin
Oleg Eroshkin
Pluripolarity of manifolds
11 pages, to appear in Contemporary Mathematics
null
null
null
math.CV
null
By the classical result of E. Bedford, a real-analytic non-generic manifold is pluripolar. We extend this result for manifolds of the Gevrey class. This also gives a generalization of the recent result of D. Coman, N. Levenberg and E. Poletsky on pluripolarity of curves of the Gevrey class.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 23:49:13 GMT" } ]
2007-12-04T00:00:00
[ [ "Eroshkin", "Oleg", "" ] ]
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712.0029
Andrew Beckwith
A.W. Beckwith
Entropy growth in the early universe and confirmation of initial big bang conditions (Why the quark-gluon model is not the best analogy)
24 pages, 5 figures. Talk presented in Chongquing University Gravitational physics group headed by Dr. Li Fangyu. Has nine 'chapters' following Chongquing presentation.Is half of talk for DNP + JPS JOINT MEETING,2009 in 13-17 October on the big island of Hawaii
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper shows how increased entropy values from an initially low big bang level can be measured experimentally by counting relic gravitons. Furthermore the physical mechanism of this entropy increase is explained via analogies with early-universe phase transitions. The rapid increase in entropy so alluded to without near sudden increases up to 10 to the 88 power may be enough to allow successful modeling of relic graviton production for entropy in a manner similar to zero point energy extraction from a vacuum state
[ { "version": "v1", "created": "Mon, 3 Dec 2007 18:48:50 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 18:40:31 GMT" }, { "version": "v3", "created": "Tue, 3 Jun 2008 20:53:06 GMT" }, { "version": "v4", "created": "Thu, 2 Apr 2009 00:31:20 GMT" }, { "version": "v5", "created": "Fri, 8 May 2009 11:43:24 GMT" } ]
2009-05-08T00:00:00
[ [ "Beckwith", "A. W.", "" ] ]
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712.003
Jeppe C. Dyre
Nicholas P. Bailey, Tage Christensen, Bo Jakobsen, Kristine Niss, Niels Boye Olsen, Ulf R. Pedersen, Thomas B. Schr{\o}der, and Jeppe C. Dyre
Glass-forming liquids: One or more "order" parameters?
null
J. Phys.: Condens. Matter 20, 244113 (2008),
10.1088/0953-8984/20/24/244113
null
cond-mat.soft
null
We first summarize the classical arguments that the vast majority of glass-forming liquids require more than one "order" parameter for their description. Critiques against this conventional wisdom are then presented, and it is argued that the matter deserves to be reconsidered in light of recent experimental developments. Out of the eight basic thermoviscoelastic frequency-dependent response functions, there are generally three independent functions. For stochastic dynamics we show that there are only two independent response functions; for this case it is shown how analytic continuation may be utilized to express the third response functions in terms of two others. Operational criteria are presented for the linear thermoviscoelasticity being described by a single "order" parameter, in which case there is just one independent thermoviscoelastic response function. It is shown that a single "order" parameter description applies to a good approximation whenever thermal equilibrium fluctuations of fundamental variables like energy and pressure are strongly correlated. Results from computer simulations showing that this is the case for a number of simple glass-forming liquids, as well as a few exceptions, are briefly presented. Finally, we discuss a new conjecture according to which experiments at varying temperature and pressure follow the density-scaling expression for the relaxation time, $\tau=F(\rho^x/T)$ ($\rho$ and $T$ are density and temperature), if and only if the liquid is "strongly correlating," i.e., to a good approximation is described by a single "order" parameter.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 00:02:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Bailey", "Nicholas P.", "" ], [ "Christensen", "Tage", "" ], [ "Jakobsen", "Bo", "" ], [ "Niss", "Kristine", "" ], [ "Olsen", "Niels Boye", "" ], [ "Pedersen", "Ulf R.", "" ], [ "Schrøder", "Thomas B.", "" ], [ "Dyre", "Jeppe C.", "" ] ]
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712.0031
Louis Theran
Ileana Streinu and Louis Theran
Slider-pinning Rigidity: a Maxwell-Laman-type Theorem
Accepted, to appear in Discrete and Computational Geometry
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We define and study slider-pinning rigidity, giving a complete combinatorial characterization. This is done via direction-slider networks, which are a generalization of Whiteley's direction networks.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 00:24:31 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 20:04:12 GMT" }, { "version": "v3", "created": "Fri, 5 Jun 2009 16:22:10 GMT" }, { "version": "v4", "created": "Wed, 11 Aug 2010 06:04:03 GMT" } ]
2010-08-12T00:00:00
[ [ "Streinu", "Ileana", "" ], [ "Theran", "Louis", "" ] ]
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712.0032
Changhyun Ahn
Changhyun Ahn
Other Meta-Stable Brane Configuration by Adding an Orientifold 6-Plane to Giveon-Kutasov
16 pp, 3 figures; The mirrors of Figures 2 and 3 corrected; the footnote 5 added and to appear in PLB
Phys.Lett.B665:418-423,2008
10.1016/j.physletb.2008.06.036
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Giveon and Kutasov have found the type IIA intersecting nonsupersymmetric meta-stable brane configuration where the electric gauge theory superpotential has a quartic term as well as the mass term for quarks. In this paper, by adding the orientifold 6-plane to this brane configuration, we describe the brane configuration corresponding to the meta-stable nonsupersymmetric vacua of the supersymmetric unitary gauge theory with symmetric flavor as well as fundamental flavors.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 00:44:14 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 07:41:15 GMT" }, { "version": "v3", "created": "Tue, 17 Jun 2008 12:52:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Ahn", "Changhyun", "" ] ]
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712.0033
Delphine Marcillac
D. Marcillac, G.H. Rieke, C. Papovich, C.N.A. Willmer, B.J. Weiner, A.L. Coil, M.C. Cooper, B.F.Gerke, J.Woo, J.A. Newman, A. Georgakakis, E.S. Laird, K. Nandra, G.G. Fazio, J.-S.Huang, D.C. Koo
The Environment on few Mpc scales of Infrared Luminous Galaxies at Redshifts z~1
47 pages, 11 figures, accepted for publication in ApJ
null
10.1086/527031
null
astro-ph
null
We investigate the environment of infrared luminous galaxies (L$_{IR}$[8-1000 $\mu $m$] >10^{11}$L$_{\sun}$). We focus on the redshift range 0.7 $\leq$ z $\leq$ 1, where these galaxies dominate the star formation activity and play a significant role in galaxy evolution. We employ MIPS 24$\mu$m data to identify infrared galaxies in the Extended Groth Strip (EGS). We use a local density indicator to probe the environment on few Mpc scales and a group member catalog, both of which make use of the DEEP2 spectroscopic redshift catalog, to quantify the environment of these galaxies. We find that the local environment of LIRGs and ULIRGs is intermediate between that of blue and red galaxies. LIRGs and ULIRGs avoid underdense environments and inhabit local environments that are more dense on average than those of other DEEP2 galaxies at similar redshifts. However, when the comparison sample of the non-IR DEEP2 galaxies is restricted to have the same range of stellar mass, color, or luminosity as the IR--galaxies, there is no longer any significant difference in environment; the IR-galaxies follow the same trends in the color-environment and luminosity-environment relations observed at z$\sim$1. We also find that about 30% of the LIRGs and ULIRGs belong to groups, associated with a minimum dark matter halo of 6$\times10^{12}$M$_{\odot}$h$^{-1}$. The group members constitute 20 % of the sources responsible for the IR star formation rate density and comoving energy density at z$\sim$1.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 00:58:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Marcillac", "D.", "" ], [ "Rieke", "G. H.", "" ], [ "Papovich", "C.", "" ], [ "Willmer", "C. N. A.", "" ], [ "Weiner", "B. J.", "" ], [ "Coil", "A. L.", "" ], [ "Cooper", "M. C.", "" ], [ "Gerke", "B. F.", "" ], [ "Woo", "J.", "" ], [ "Newman", "J. A.", "" ], [ "Georgakakis", "A.", "" ], [ "Laird", "E. S.", "" ], [ "Nandra", "K.", "" ], [ "Fazio", "G. G.", "" ], [ "Huang", "J. -S.", "" ], [ "Koo", "D. C.", "" ] ]
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712.0034
Suman Bhattacharya
Suman Bhattacharya, Arthur Kosowsky (University of Pittsburgh)
Dark Energy Constraints from Galaxy Cluster Peculiar Velocities
25 pages, 10 figures. Results and conclusions unchanged. Minor changes to match the accepted version in Physical Review D
Phys.Rev.D77:083004,2008
10.1103/PhysRevD.77.083004
null
astro-ph
null
Future multifrequency microwave background experiments with arcminute resolution and micro-Kelvin temperature sensitivity will be able to detect the kinetic Sunyaev-Zeldovich (kSZ) effect, providing a way to measure radial peculiar velocities of massive galaxy clusters. We show that cluster peculiar velocities have the potential to constrain several dark energy parameters. We compare three velocity statistics (the distribution of radial velocities, the mean pairwise streaming velocity, and the velocity correlation function) and analyze the relative merits of these statistics in constraining dark energy parameters. Of the three statistics, mean pairwise streaming velocity provides constraints that are least sensitive to velocity errors: the constraints on parameters degrades only by a factor of two when the random error is increased from 100 to 500 km/s. We also compare cluster velocities with other dark energy probes proposed in the Dark Energy Task Force report. For cluster velocity measurements with realistic priors, the eventual constraints on the dark energy density, the dark energy equation of state and its evolution are comparable to constraints from supernovae measurements, and better than cluster counts and baryon acoustic oscillations; adding velocity to other dark energy probes improves constraints on the figure of merit by more than a factor of two. For upcoming Sunyaev-Zeldovich galaxy cluster surveys, even velocity measurements with errors as large as 1000 km/s will substantially improve the cosmological constraints compared to using the cluster number density alone.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 01:21:07 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 15:44:06 GMT" }, { "version": "v3", "created": "Tue, 1 Jan 2008 22:08:45 GMT" }, { "version": "v4", "created": "Fri, 25 Apr 2008 02:21:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Bhattacharya", "Suman", "", "University of Pittsburgh" ], [ "Kosowsky", "Arthur", "", "University of Pittsburgh" ] ]
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712.0035
Qing Zhao
Qing Zhao, Bhaskar Krishnamachari, Keqin Liu
On Myopic Sensing for Multi-Channel Opportunistic Access: Structure, Optimality, and Performance
To appear in IEEE Transactions on Wireless Communications. This is a revised version
null
10.1109/T-WC.2008.071349
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a multi-channel opportunistic communication system where the states of these channels evolve as independent and statistically identical Markov chains (the Gilbert-Elliot channel model). A user chooses one channel to sense and access in each slot and collects a reward determined by the state of the chosen channel. The problem is to design a sensing policy for channel selection to maximize the average reward, which can be formulated as a multi-arm restless bandit process. In this paper, we study the structure, optimality, and performance of the myopic sensing policy. We show that the myopic sensing policy has a simple robust structure that reduces channel selection to a round-robin procedure and obviates the need for knowing the channel transition probabilities. The optimality of this simple policy is established for the two-channel case and conjectured for the general case based on numerical results. The performance of the myopic sensing policy is analyzed, which, based on the optimality of myopic sensing, characterizes the maximum throughput of a multi-channel opportunistic communication system and its scaling behavior with respect to the number of channels. These results apply to cognitive radio networks, opportunistic transmission in fading environments, and resource-constrained jamming and anti-jamming.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 01:10:30 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 00:02:14 GMT" }, { "version": "v3", "created": "Wed, 5 Nov 2008 01:53:19 GMT" } ]
2016-11-17T00:00:00
[ [ "Zhao", "Qing", "" ], [ "Krishnamachari", "Bhaskar", "" ], [ "Liu", "Keqin", "" ] ]
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712.0036
Sebastian Brandt
Ulrike Meyer, Jing Shao, Saurish Chakrabarty, Sebastian F. Brandt, Harald Luksch, Ralf Wessel
Distributed delays stabilize neural feedback systems
7 pages, 4 figures
null
null
null
physics.bio-ph q-bio.NC
null
We consider the effect of distributed delays in neural feedback systems. The avian optic tectum is reciprocally connected with the nucleus isthmi. Extracellular stimulation combined with intracellular recordings reveal a range of signal delays from 4 to 9 ms between isthmotectal elements. This observation together with prior mathematical analysis concerning the influence of a delay distribution on system dynamics raises the question whether a broad delay distribution can impact the dynamics of neural feedback loops. For a system of reciprocally connected model neurons, we found that distributed delays enhance system stability in the following sense. With increased distribution of delays, the system converges faster to a fixed point and converges slower toward a limit cycle. Further, the introduction of distributed delays leads to an increased range of the average delay value for which the system's equilibrium point is stable. The enhancement of stability with increasing delay distribution is caused by the introduction of smaller delays rather than the distribution per se.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 19:30:36 GMT" } ]
2007-12-04T00:00:00
[ [ "Meyer", "Ulrike", "" ], [ "Shao", "Jing", "" ], [ "Chakrabarty", "Saurish", "" ], [ "Brandt", "Sebastian F.", "" ], [ "Luksch", "Harald", "" ], [ "Wessel", "Ralf", "" ] ]
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712.0037
Hui Hu
Hui Hu, Xia-Ji Liu, and Peter D. Drummond
Comparative study of strong coupling theories of a trapped Fermi gas at unitarity
4 pages and 3 figures; Published version in PRA as Rapid Communications
Phys. Rev. A 77, 061605(R) (2008)
10.1103/PhysRevA.77.061605
null
cond-mat.stat-mech cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a systematic comparison of the most recent thermodynamic measurements of a trapped Fermi gas at unitarity with predictions from strong coupling theories and quantum Monte Carlo (MC) simulations. The accuracy of the experimental data, of the order of a few percent, allows a precise test of different many-body approaches. We find that a Nozieres and Schmitt-Rink treatment of fluctuations is in excellent agreement with the experimental data and available MC calculations at unitarity.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 01:49:28 GMT" }, { "version": "v2", "created": "Wed, 9 Jul 2008 01:44:59 GMT" } ]
2008-07-09T00:00:00
[ [ "Hu", "Hui", "" ], [ "Liu", "Xia-Ji", "" ], [ "Drummond", "Peter D.", "" ] ]
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712.0038
Daisuke Jido
D. Jido (1), M. Doering (2), E. Oset (2) ((1) YITP, Kyoto, (2) IFIC, Valencia)
Transition form factors of the N*(1535) as a dynamically generated resonance
19 pages, 16 figures, REVTeX
Phys.Rev.C77:065207,2008
10.1103/PhysRevC.77.065207
YITP-07-83
nucl-th
null
We discuss how electromagnetic properties provide useful tests of the nature of resonances, and we study these properties for the N*(1535) which appears dynamically generated from the strong interaction of mesons and baryons. Within this coupled channel chiral unitary approach, we evaluate the A_1/2 and S_1/2 helicity amplitudes as a function of Q^2 for the electromagnetic N*(1535) to gamma* N transition. Within the same formalism we evaluate the cross section for the reactions gamma N to eta N. We find a fair agreement for the absolute values of the transition amplitudes, as well as for the Q^2 dependence of the amplitudes, within theoretical and experimental uncertainties discussed in the paper. The ratios obtained between the S_1/2 and A_1/2 for the neutron or proton states of the N*(1535) are in qualitative agreement with experiment and there is agreement on the signs. The same occurs for the ratio of cross sections for the eta photoproduction on neutron and proton targets in the vicinity of the N*(1535) energy. The global results support the idea of this resonance as being dynamically generated, hence, largely built up from meson baryon components. However, the details of the model indicate that an admixture with a genuine quark state is also demanded that could help obtain a better agreement with experimental data.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 01:51:13 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 08:10:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Jido", "D.", "" ], [ "Doering", "M.", "" ], [ "Oset", "E.", "" ] ]
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712.0039
Bruno Julia Diaz
B. Julia-Diaz
Dynamical coupled-channels: the key to understanding resonances
Invited Plenary talk at the 20th European Conference on Few-Body Problems in Physics (EFB20), September 10-14 2007, Pisa, Italy. To appear in the proceedings in Few-Body Systems
Few Body Syst.43:103-108,2008
10.1007/s00601-008-0216-8
null
nucl-th
null
Recent developments on a dynamical coupled-channels model of hadronic and electromagnetic production of nucleon resonances are summarized.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 02:03:02 GMT" } ]
2009-01-08T00:00:00
[ [ "Julia-Diaz", "B.", "" ] ]
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712.004
Florian Schiller
Florian Schiller, Norbert Przybilla
Quantitative spectroscopy of Deneb
17 pages, 12 figures. Accepted for publication in A&A
null
10.1051/0004-6361:20078590
null
astro-ph
null
Quantitative spectroscopy of luminous BA-type supergiants offers a high potential for modern astrophysics. The degree to which we can rely on quantitative studies of this class of stars as a whole depends on the quality of the analyses for benchmark objects. We constrain the basic atmospheric parameters and fundamental stellar parameters as well as chemical abundances of the prototype A-type supergiant Deneb to unprecedented accuracy (Teff = 8525 +/- 75 K, log(g) = 1.10 +/- 0.05 dex, M_spec = 19 +/- 3 M_sun, L = 1.96 +/- 0.32 *10^5 L_sun, R = 203 +/- 17 R_sun, enrichment with CN-processed matter) by applying a sophisticated hybrid NLTE spectrum synthesis technique which has recently been developed and tested. The study is based on a high-resolution and high-S/N spectrum obtained with the Echelle spectrograph FOCES on the Calar Alto 2.2m telescope. Practically all inconsistencies reported in earlier studies are resolved. Multiple metal ionization equilibria and numerous hydrogen lines from the Balmer, Paschen, Brackett and Pfund series are brought into match simultaneously for the stellar parameter determination. Stellar wind properties are derived from H_alpha line-profile fitting using line-blanketed hydrodynamic non-LTE models. A self-consistent view of Deneb is thus obtained, allowing us to discuss its evolutionary state in detail by comparison with the most recent generation of evolution models for massive stars. (abridged)
[ { "version": "v1", "created": "Sat, 1 Dec 2007 03:03:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Schiller", "Florian", "" ], [ "Przybilla", "Norbert", "" ] ]
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712.0041
Yun Wang
Yun Wang
Observational approaches to understanding dark energy
12 pages. Invited review at the 23rd International Symposium on Lepton and Photon Interactions at High Energy (LP07)
null
null
null
astro-ph hep-ph
null
Illuminating the nature of dark energy is one of the most important challenges in cosmology today. In this review I discuss several promising observational approaches to understanding dark energy, in the context of the recommendations by the U.S. Dark Energy Task Force and the ESA-ESO Working Group on Fundamental Cosmology.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 03:24:07 GMT" } ]
2007-12-23T00:00:00
[ [ "Wang", "Yun", "" ] ]
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712.0042
Matthew Mckay Dr.
Matthew R. McKay, Peter J. Smith, Himal A. Suraweera, and Iain B. Collings
On the Mutual Information Distribution of OFDM-Based Spatial Multiplexing: Exact Variance and Outage Approximation
18 pages, 10 figures, accepted for publication in IEEE Transactions on Information Theory
null
10.1109/TIT.2008.924685
null
cs.IT math.IT
null
This paper considers the distribution of the mutual information of frequency-selective spatially-uncorrelated Rayleigh fading MIMO channels. Results are presented for OFDM-based spatial multiplexing. New exact closed-form expressions are derived for the variance of the mutual information. In contrast to previous results, our new expressions apply for systems with both arbitrary numbers of antennas and arbitrary-length channels. Simplified expressions are also presented for high and low SNR regimes. The analytical variance results are used to provide accurate analytical approximations for the distribution of the mutual information and the outage capacity.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 03:22:16 GMT" } ]
2016-11-17T00:00:00
[ [ "McKay", "Matthew R.", "" ], [ "Smith", "Peter J.", "" ], [ "Suraweera", "Himal A.", "" ], [ "Collings", "Iain B.", "" ] ]
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712.0043
Ashoke Sen
Shamik Banerjee and Ashoke Sen
Duality Orbits, Dyon Spectrum and Gauge Theory Limit of Heterotic String Theory on T^6
LaTeX file, 22 pages
JHEP 0803:022,2008
10.1088/1126-6708/2008/03/022
null
hep-th
null
For heterotic string theory compactified on T^6, we derive the complete set of T-duality invariants which characterize a pair of charge vectors (Q,P) labelling the electric and magnetic charges of the dyon. Using this we can identify the complete set of dyons to which the previously derived degeneracy formula can be extended. By going near special points in the moduli space of the theory we derive the spectrum of quarter BPS dyons in N=4 supersymmetric gauge theory with simply laced gauge groups. The results are in agreement with those derived from field theory analysis.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 17:28:41 GMT" } ]
2009-09-15T00:00:00
[ [ "Banerjee", "Shamik", "" ], [ "Sen", "Ashoke", "" ] ]
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712.0044
Tao Wang
Tao Wang
Quantum Statistical Transition
5 pages no figures
null
null
null
cond-mat.stat-mech cond-mat.str-el
null
By analyzing the BCS-BEC crossover, I found that because of the pairing interactions,a continuous family of quantum statistics interpolating between fermions and bosons is possible, although it seems incapable to construct reasonable wave function.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 04:09:24 GMT" } ]
2007-12-04T00:00:00
[ [ "Wang", "Tao", "" ] ]
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712.0045
Kimball A. Milton
Kimball A. Milton, Ines Cavero-Pelaez, Prachi Parashar, K. V. Shajesh, and Jef Wagner
PT-Symmetry Quantum Electrodynamics--PTQED
11 pages, 1 figure, contributed to Proceedings of 6th International Workshop on Pseudo-Hermitian Hamiltonians in Quantum Physics
Int.J.Theor.Phys.50:963-973,2011
10.1007/s10773-010-0526-8
null
hep-th quant-ph
null
The construction of $\mathcal{PT}$-symmetric quantum electrodynamics is reviewed. In particular, the massless version of the theory in 1+1 dimensions (the Schwinger model) is solved. Difficulties with unitarity of the $S$-matrix are discussed.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 04:45:22 GMT" } ]
2011-03-17T00:00:00
[ [ "Milton", "Kimball A.", "" ], [ "Cavero-Pelaez", "Ines", "" ], [ "Parashar", "Prachi", "" ], [ "Shajesh", "K. V.", "" ], [ "Wagner", "Jef", "" ] ]
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712.0046
Fernando Roig
F. Roig, A. O. Ribeiro, R. Gil-Hutton
Taxonomy of asteroid families among the Jupiter Trojans: Comparison between spectroscopic data and the Sloan Digital Sky Survey colors
20 pages, 15 figures, 2 tables
null
10.1051/0004-6361:20079177
null
astro-ph
null
We present a comparative analysis of the spectral slope and color distributions of Jupiter Trojans, with particular attention to asteroid families. We use a sample of data from the Moving Object Catalogue of the Sloan Digital Sky Survey, together with spectra obtained from several surveys. A first sample of 349 observations, corresponding to 250 Trojan asteroids, were extracted from the Sloan Digital Sky Survey, and we also extracted from the literature a second sample of 91 spectra, corresponding to 71 Trojans. The spectral slopes were computed by means of a least-squares fit to a straight line of the fluxes obtained from the Sloan observations in the first sample, and of the rebinned spectra in the second sample. In both cases the reflectance fluxes/spectra were renormalized to 1 at 6230 $\textrm{\AA}$. We found that the distribution of spectral slopes among Trojan asteroids shows a bimodality. About 2/3 of the objects have reddish slopes compatible with D-type asteroids, while the remaining bodies show less reddish colors compatible with the P-type and C-type classifications. The members of asteroid families also show a bimodal distribution with a very slight predominance of D-type asteroids, but the background is clearly dominated by the D-types. The L4 and L5 swarms show different distributions of spectral slopes, and bimodality is only observed in L4. These differences can be attributed to the asteroid families since the backgraound asteroids show the same slope distribtuions in both swarms. The analysis of individual families indicates that the families in L5 are taxonomically homogeneous, but in L4 they show a mixture of taxonomic types. We discuss a few scenarios that might help to interpret these results.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 04:56:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Roig", "F.", "" ], [ "Ribeiro", "A. O.", "" ], [ "Gil-Hutton", "R.", "" ] ]
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712.0047
Shaun Hendy
S. C. Hendy and N. J. Lund
Effective slip boundary conditions for flows over nanoscale chemical heterogeneities
14 pages, 3 figures
Physical Review E 76 066313 (2007)
10.1103/PhysRevE.76.066313
null
physics.flu-dyn
null
We study slip boundary conditions for simple fluids at surfaces with nanoscale chemical heterogeneities. Using a perturbative approach, we examine the flow of a Newtonian fluid far from a surface described by a heterogeneous Navier slip boundary condition. In the far-field, we obtain expressions for an effective slip boundary condition in certain limiting cases. These expressions are compared to numerical solutions which show they work well when applied in the appropriate limits. The implications for experimental measurements and for the design of surfaces that exhibit large slip lengths are discussed.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 05:15:28 GMT" } ]
2007-12-21T00:00:00
[ [ "Hendy", "S. C.", "" ], [ "Lund", "N. J.", "" ] ]
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712.0048
Begum Umme Jamil
U. Jamil and J. K. Sarma
Regge behaviour of distribution functions and evolution of gluon distribution function in Next-to-Leading order at low-x
12 pages, 4 figures
Pramana 71:509,2008
10.1007/s12043-008-0127-8
null
hep-ph
null
Evolution of gluon distribution function from Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equation in next-to-leading order (NLO) at low-x is presented assuming the Regge behaviour of quarks and gluons at this limit. We compare our results of gluon distribution function with MRST2004, GRV98LO and GRV98NLO parameterizations and show the compatibility of Regge behaviour of quark and gluon distribution functions with perturbative quantum chromodynamics (PQCD) at low-x.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 05:15:54 GMT" } ]
2010-03-25T00:00:00
[ [ "Jamil", "U.", "" ], [ "Sarma", "J. K.", "" ] ]
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712.0049
Mikhail Antipov V
M. V. Antipov
Fillings method in number theory
null
null
null
null
math.GM
null
Number of results in number theory have been developed using a new method. The Goldbach binary conjecture in strengthened formulation have been among them.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 05:31:21 GMT" } ]
2007-12-04T00:00:00
[ [ "Antipov", "M. V.", "" ] ]
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712.005
Laurence G. Yaffe
Paul M. Chesler and Laurence G. Yaffe
The stress-energy tensor of a quark moving through a strongly-coupled N=4 supersymmetric Yang-Mills plasma: comparing hydrodynamics and AdS/CFT
29 pages
Phys.Rev.D78:045013,2008
10.1103/PhysRevD.78.045013
null
hep-th hep-ph nucl-th
null
The stress-energy tensor of a quark moving through a strongly coupled N=4 supersymmetric Yang-Mills plasma is evaluated using gauge/string duality. The accuracy with which the resulting wake, in position space, is reproduced by hydrodynamics is examined. Remarkable agreement is found between hydrodynamics and the complete result down to distances less than 2/T away from the quark. In performing the gravitational analysis, we use a relatively simple formulation of the bulk to boundary problem in which the linearized Einstein field equations are fully decoupled. Our analysis easily generalizes to other sources in the bulk.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 23:19:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Chesler", "Paul M.", "" ], [ "Yaffe", "Laurence G.", "" ] ]
[ 0.0248285066, 0.0265227444, -0.0959986895, 0.0244872216, 0.0341772884, 0.0413930342, 0.0281072836, -0.0004646965, 0.0225126427, 0.0035408353, 0.0165645275, 0.0501201861, -0.1614767164, 0.0834686384, 0.0064905155, 0.0897092894, -0.0678182691, -0.0560683049, 0.0423193797, 0.0121461013, -0.0721574724, -0.0976563618, 0.1085287333, -0.0493888631, -0.02676652, -0.0385408625, 0.0463660508, -0.0324221067, 0.0454640798, 0.0283266827, 0.0401254036, -0.0320808217, 0.0572384261, -0.0714748949, 0.0195751507, 0.2053562552, -0.0114025865, 0.1112590134, -0.0345429517, -0.0330802985, -0.0236949529, 0.0331046768, -0.0763016492, 0.1172071323, -0.000314432, -0.0153578399, -0.0397353619, 0.0202942882, 0.0646979436, -0.0629427657, 0.0009583414, 0.0210499913, 0.016869247, -0.0191973001, -0.0822497606, -0.0339822657, 0.0340310223, 0.0443427153, -0.042343758, -0.1187672913, -0.0542643666, -0.0264496133, -0.0301062409, 0.002296058, -0.0855651051, -0.0793732181, -0.0582622811, -0.0132735614, -0.0177468378, 0.0598224439, -0.0389065258, 0.0386139974, 0.0917569995, -0.0194288865, 0.0369807035, -0.0789344236, 0.0904893652, -0.0570434034, -0.0222444907, 0.0605537668, 0.0104335798, 0.0047079092, 0.0211596899, 0.0016378649, -0.0550932027, -0.0215741079, -0.0020538063, 0.0356886946, -0.0849800482, 0.0387115069, 0.0470486209, 0.0976076052, -0.0582622811, -0.037224479, 0.0089099845, -0.0289361198, 0.1289083362, -0.0310569648, 0.030593792, -0.0455372147, -0.0477068126, 0.0520216338, -0.0745952204, -0.0859551504, 0.1818563193, -0.0241581257, -0.0896117762, -0.0124934809, -0.0346892141, 0.0695734546, 0.1722028255, 0.0982414186, -0.0809821337, 0.0696222037, -0.0491694659, -0.0301549956, -0.0534355305, -0.0162232425, -0.0708410814, 0.1063835099, 0.0441964492, -0.0190997887, 0.0904406086, 0.0056251134, 0.0380776897, -0.0417343192, -0.034006644, -0.0721574724, -0.1540659517, 0.0595786683, 0.0750340149, -0.039199058, -0.1116490588, -0.0430750847, -0.0517778583, 0.0634790733, -0.0007218032, -0.0021985478, 0.1117465645, -0.0586035661, 0.0804945827, 0.0437088981, 0.0695734546, 0.0363956429, 0.0434163697, 0.0993627831, 0.0475605465, 0.097510092, 0.0254013799, -0.0233780444, 0.0033793342, 0.038784638, 0.0601149723, -0.0312763639, 0.0164060723, -0.1184747666, 0.05709216, 0.0477799438, 0.0268640313, -0.0937071964, -0.0230489485, 0.0284241922, -0.0251576044, -0.0043056798, 0.0829810873, -0.0719136968, -0.0744977146, -0.0289848745, -0.0628940091, -0.0794219673, -0.0382483341, -0.0285217017, -0.0571896695, 0.0291798953, 0.1523107588, 0.034762349, 0.0205136854, -0.0971688107, -0.0711823702, 0.052314166, 0.0859063938, -0.0370782129, 0.0748389959, -0.0441476963, -0.0858576372, -0.0093426853, -0.0195629615, 0.0596761778, 0.05709216, -0.0261083283, -0.0631377846, 0.1337838471, -0.0036292039, 0.0587010756, -0.042002473, -0.0489500649, -0.0095925555, 0.0655267835, 0.0333972052, 0.0635278225, 0.0156259928, 0.0419049636, 0.0081664706, -0.0289848745, -0.0284485705, 0.0333972052, 0.0358837135, -0.0341041535, -0.1336863339, 0.0314470045, 0.0250113383, -0.008842947, 0.0641128868, -0.0060547674, -0.0744977146, -0.0094523849, -0.0828348249, 0.1193523556, -0.0113294544, 0.0262302142, -0.0223663785, 0.1497755051, 0.044318337, 0.1147693768, -0.0131272962, -0.0249869619, 0.0636253357, -0.0554832444, -0.0333728306, 0.0195142068, 0.0804945827, 0.0559707917, -0.0039308756, -0.0444646031, 0.0017140446, -0.1040432677, 0.0315688923, 0.0634790733, 0.0088917017, -0.0075935987, -0.0140536418, -0.0302037522, -0.0564095899, -0.0110552069, -0.0062833065, 0.0402960442, -0.012152195, -0.0880028605, 0.0733763427, -0.077081725, -0.0270346738, 0.1368066669, 0.0011739301, 0.0479505882, -0.1295909137, -0.0141877187 ]
712.0051
HengTong Ding
Z. Conesa del Valle, A. Dainese, H.-T. Ding, G. Mart\'inez Garc\'ia, D.C. Zhou
Effect of heavy-quark energy loss on the muon differential production cross section in Pb-Pb collisions at \sqrtsNN=5.5 TeV
null
Phys.Lett.B663:202-208,2008
10.1016/j.physletb.2008.03.073
null
hep-ph
null
We study the nuclear modification factors RAA and RCP of the high transverse momentum 5<pt<60 GeV/c distribution of muons in Pb--Pb collisions at LHC energies. We consider two pseudo-rapidity ranges covered by the LHC experiments: $|\eta|<2.5$ and $2.5<\eta<4$. Muons from semi-leptonic decays of heavy quarks (c and b) and from leptonic decays of weak gauge bosons (W and Z) are the main contributions to the muon pt distribution above a few GeV/c. We compute the heavy quark contributions using available pQCD-based programs. We include the nuclear shadowing modification of the parton distribution functions and the in-medium radiative energy loss for heavy quarks, using the mass-dependent BDMPS quenching weights. Muons from W and Z leptonic decays, that dominate the yield at high pt, can be used as a medium-blind reference to observe the medium-induced suppression of beauty quarks.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:45:49 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 08:48:08 GMT" }, { "version": "v3", "created": "Thu, 13 Mar 2008 12:22:17 GMT" } ]
2008-11-26T00:00:00
[ [ "del Valle", "Z. Conesa", "" ], [ "Dainese", "A.", "" ], [ "Ding", "H. -T.", "" ], [ "García", "G. Martínez", "" ], [ "Zhou", "D. C.", "" ] ]
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712.0052
Gentaro Watanabe
Hidetaka Sonoda, Gentaro Watanabe, Katsuhiko Sato, Kenji Yasuoka, and Toshikazu Ebisuzaki
Phase diagram of nuclear "pasta" and its uncertainties in supernova cores
11 pages, 5 figures
Phys.Rev.C77:035806,2008; Erratum-ibid.C81:049902,2010
10.1103/PhysRevC.77.035806 10.1103/PhysRevC.81.049902
UTAP-589,RESCEU-88/07,NORDITA-2007-037
nucl-th astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine the model dependence of the phase diagram of inhomogeneous nulcear matter in supernova cores using the quantum molecular dynamics (QMD). Inhomogeneous matter includes crystallized matter with nonspherical nuclei - "pasta" phases - and the liquid-gas phase separating nuclear matter. Major differences between the phase diagrams of the QMD models can be explained by the energy of pure neutron matter at low densities and the saturation density of asymmetric nuclear matter. We show the density dependence of the symmetry energy is also useful to understand uncertainties of the phase diagram. We point out that, for typical nuclear models, the mass fraction of the pasta phases in the later stage of the collapsing cores is higher than 10-20 %.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 07:13:04 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 06:05:15 GMT" }, { "version": "v3", "created": "Thu, 11 Mar 2010 13:49:38 GMT" } ]
2014-11-18T00:00:00
[ [ "Sonoda", "Hidetaka", "" ], [ "Watanabe", "Gentaro", "" ], [ "Sato", "Katsuhiko", "" ], [ "Yasuoka", "Kenji", "" ], [ "Ebisuzaki", "Toshikazu", "" ] ]
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712.0053
Moqbil Alenazi
Moqbil S. Alenazi, Paolo Gondolo
Directional recoil rates for WIMP direct detection
39 pages, 15 figures
Phys.Rev.D77:043532,2008
10.1103/PhysRevD.77.043532
null
astro-ph hep-ex hep-ph
null
New techniques for the laboratory direct detection of dark matter weakly interacting massive particles (WIMPs) are sensitive to the recoil direction of the struck nuclei. We compute and compare the directional recoil rates ${dR}/{d\cos\theta}$ (where $\theta$ is the angle measured from a reference direction in the sky) for several WIMP velocity distributions including the standard dark halo and anisotropic models such as Sikivie's late-infall halo model and logarithmic-ellipsoidal models. Since some detectors may be unable to distinguish the beginning of the recoil track from its end (lack of head-tail discrimination), we introduce a ``folded'' directional recoil rate ${dR}/{d|\cos\theta|}$, where $|\cos\theta|$ does not distinguish the head from the tail of the track. We compute the CS$_2$ and CF$_4$ exposures required to distinguish a signal from an isotropic background noise, and find that ${dR}/{d|\cos\theta|}$ is effective for the standard dark halo and some but not all anisotropic models.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 07:56:53 GMT" }, { "version": "v2", "created": "Sun, 2 Mar 2008 11:02:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Alenazi", "Moqbil S.", "" ], [ "Gondolo", "Paolo", "" ] ]
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712.0054
Boris Kolev
Boris Kolev (LATP), David H. Sattinger
Variational Principles for Water Waves
20 pages
SIAM journal on mathematical analysis 38 (3) (2006) pp. 906-920
10.1137/050647220
null
math-ph math.MP
null
We describe the Hamiltonian structures, including the Poisson brackets and Hamiltonians, for free boundary problems for incompressible fluid flows with vorticity. The Hamiltonian structure is used to obtain variational principles for stationary gravity waves both for irrotational flows as well as flows with vorticity.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 07:48:06 GMT" } ]
2007-12-04T00:00:00
[ [ "Kolev", "Boris", "", "LATP" ], [ "Sattinger", "David H.", "" ] ]
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712.0055
Aurelien Manchon
Aur\'elien Manchon (SPINTEC), Natalya Ryzhanova (SPINTEC), A. Vedyayev (SPINTEC), Mairbek Chschiev, Bernard Dieny (SPINTEC)
Description of current-driven torques in magnetic tunnel junctions
null
null
10.1088/0953-8984/20/14/145208
null
cond-mat.mes-hall
null
A free electron description of spin-dependent tranport in magnetic tunnel junctions with non collinear magnetizations is presented. We investigate the origin of transverse spin density in tunnelling transport and the quantum interferences which give rise to oscillatory torques on the local magnetization. Spin transfer torque is also analyzed and an important bias asymmetry is found as well as a damped oscillatory behaviour. Furthermore, we investigate the influence of the s-d exchange coupling on torque in particular in the case of half-metallic MTJ in which the spin transfer torque is due to interfacial spin-dependent reflections.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 07:53:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Manchon", "Aurélien", "", "SPINTEC" ], [ "Ryzhanova", "Natalya", "", "SPINTEC" ], [ "Vedyayev", "A.", "", "SPINTEC" ], [ "Chschiev", "Mairbek", "", "SPINTEC" ], [ "Dieny", "Bernard", "", "SPINTEC" ] ]
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712.0056
Boris Kolev
Boris Kolev (LATP)
Periodic orbits of period 3 in the disc
7 pages
Nonlinearity 7 (1994) 1067-1071
10.1088/0951-7715/7/3/016
null
math.DS
null
Let f be an orientation preserving homeomorphism of the disc D2 which possesses a periodic point of period 3. Then either f is isotopic, relative the periodic orbit, to a homeomorphism g which is conjugate to a rotation by 2 pi /3 or 4 pi /3, or f has a periodic point of least period n for each n in N*.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 07:58:42 GMT" } ]
2007-12-04T00:00:00
[ [ "Kolev", "Boris", "", "LATP" ] ]
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712.0057
Yuriy Reznik
Yuriy Reznik
On Precision - Redundancy Relation in the Design of Source Coding Algorithms
null
null
null
null
cs.IT math.IT
null
We study the effects of finite-precision representation of source's probabilities on the efficiency of classic source coding algorithms, such as Shannon, Gilbert-Moore, or arithmetic codes. In particular, we establish the following simple connection between the redundancy $R$ and the number of bits $W$ necessary for representation of source's probabilities in computer's memory ($R$ is assumed to be small): \begin{equation*} W \lesssim \eta \log_2 \frac{m}{R}, \end{equation*} where $m$ is the cardinality of the source's alphabet, and $\eta \leqslant 1$ is an implementation-specific constant. In case of binary alphabets ($m=2$) we show that there exist codes for which $\eta = 1/2$, and in $m$-ary case ($m > 2$) we show that there exist codes for which $\eta = m/(m+1)$. In general case, however (which includes designs relying on progressive updates of frequency counters), we show that $\eta = 1$. Usefulness of these results for practical designs of source coding algorithms is also discussed.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 08:14:02 GMT" } ]
2007-12-04T00:00:00
[ [ "Reznik", "Yuriy", "" ] ]
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712.0058
Alexei Zhedanov
Alezei Zhedanov
Elliptic solutions of the Toda chain and a generalization of the Stieltjes-Carlitz polynomials
40 pages, submitted to Ramanujan J
null
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct new elliptic solutions of the restricted Toda chain. These solutions give rise to a new explicit class of orthogonal polynomials which can be considered as a generalization of the Stieltjes-Carlitz elliptic polynomials. Relations between characteristic (i.e. positive definite) functions, Toda chain and orthogonal polynomials are developed in order to derive main properties of these polynomials. The recurrence coefficients and the weight function of these polynomials are expressed explicitly. In the degenerated cases of the elliptic functions the modified Meixner polynomials and the Krall-Laguerre polynomials appear.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:08:35 GMT" }, { "version": "v2", "created": "Mon, 27 Sep 2010 00:43:16 GMT" } ]
2010-09-28T00:00:00
[ [ "Zhedanov", "Alezei", "" ] ]
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712.0059
Wen-Ge Wang
Wen-ge Wang, Jiangbin Gong, G. Casati, and Baowen Li
Entanglement-induced Decoherence and Energy Eigenstates
5 pages and 3 figures
Phys. Rev. A 77, 012108 (2008)
10.1103/PhysRevA.77.012108
null
quant-ph
null
Using recent results in the field of quantum chaos we derive explicit expressions for the time scale of decoherence induced by the system-environment entanglement. For a generic system-environment interaction and for a generic quantum chaotic system as environment, conditions are derived for energy eigenstates to be preferred states in the weak coupling regime. A simple model is introduced to numerically confirm our predictions. The results presented here may also help understanding the dynamics of quantum entanglement generation in chaotic quantum systems.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:08:41 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 13:17:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Wen-ge", "" ], [ "Gong", "Jiangbin", "" ], [ "Casati", "G.", "" ], [ "Li", "Baowen", "" ] ]
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712.006
Razmik Unanyan
F. E. Zimmer, J. Otterbach, R. G. Unanyan, B. W. Shore, and M. Fleischhauer
Dark-State Polaritons for multi-component and stationary light fields
6 pages, 2 figures
Physical Review A 77, 063823 (6 pages) (2008)
10.1103/PhysRevA.77.063823
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a general scheme to determine the loss-free adiabatic eigensolutions (dark-state polaritons) of the interaction of multiple probe laser beams with a coherently driven atomic ensemble under conditions of electromagnetically induced transparency. To this end we generalize the Morris-Shore transformation to linearized Heisenberg-Langevin equations describing the coupled light-matter system in the weak excitation limit. For the simple lambda-type coupling scheme the generalized Morris-Shore transformation reproduces the dark-state polariton solutions of slow light. Here we treat a closed-loop dual-V scheme wherein two counter-propagating control fields generate a quasi stationary pattern of two counter-propagating probe fields -- so-called stationary light. We show that contrary to previous predictions,there exists a single unique dark-state polariton; it obeys a simple propagation equation.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:15:45 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 15:28:46 GMT" }, { "version": "v3", "created": "Fri, 7 Mar 2008 13:47:33 GMT" }, { "version": "v4", "created": "Tue, 17 Jun 2008 20:09:39 GMT" } ]
2008-06-17T00:00:00
[ [ "Zimmer", "F. E.", "" ], [ "Otterbach", "J.", "" ], [ "Unanyan", "R. G.", "" ], [ "Shore", "B. W.", "" ], [ "Fleischhauer", "M.", "" ] ]
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712.0061
Antonio Bianconi
Antonio Bianconi
Feshbach shape resonance for high Tc superconductivity in superlattices of nanotubes
6 pages, 4 figures
physica status solidi (a) 203, 2950 - 2955 (2006)
10.1002/pssa.200567003
null
cond-mat.supr-con cond-mat.mtrl-sci
null
The case of a Feshbach shape resonance in the pairing mechanism for high T c superconductivity in a crystalline lattice of doped metallic nanotubes is described. The superlattice of doped metallic nanotubes provides a superconductor with a strongly asymmetric gap. The disparity and different spatial locations of the wave functions of electrons in different subbands at the Fermi level should suppress the single electron impurity interband scattering giving multiband superconductivity in the clean limit. The Feshbach resonances will arise from the component single-particle wave functions out of which the electron pair wave function is constructed: pairs of wave functions which are time inverse of each other. The Feshbach shape resonance increases the critical temperature by tuning the chemical potential at the Lifshitz electronic topological transition (ETT) where the Fermi surface of one of the bands changes from the one dimensional (1D) to the two dimensional (2D) topology (1D/2D ETT).
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:16:05 GMT" } ]
2011-02-01T00:00:00
[ [ "Bianconi", "Antonio", "" ] ]
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712.0062
Mais Suleymanov
M.K. Suleymanov, E.U. Khan, A. Kravchakova, Mahnaz Q. Haseeb, S.M. Saleem, Y.H. Huseynaliyev, S. Vokal, A.S. Vodopianov, O.B. Abdinov
Multiplicity and angular distribution of particles emitted in relativistic nuclear-nuclear interactions
6 pages, 12 figures
null
null
null
nucl-ex
null
We discuss the experimental results on the behavior of the average multiplicities and angular distributions of slow particles emitted in hadron-nuclear and nuclear-nuclear interactions at relativistic energies as a function of the centrality of collisions. It is observed that by increasing the mass of the projectiles the angular distributions of slow particles change and the structure which was demonstrated in the case of pi-mesons, protons and light nuclear projectiles, almost disappears. During the interaction of the heavier projectile with nuclear target, the number of secondary interactions as well as number of nucleon-nucleon elastic scattering and re-scattering events increases. We suggest to restore this information using the heavy ion generators taking into account the multiplicity distributions. Because our investigations show that the formation of the percolation cluster sufficiently influences the behaviour of the average multiplicity of the slow particles emitted in these interactions.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:16:36 GMT" } ]
2007-12-04T00:00:00
[ [ "Suleymanov", "M. K.", "" ], [ "Khan", "E. U.", "" ], [ "Kravchakova", "A.", "" ], [ "Haseeb", "Mahnaz Q.", "" ], [ "Saleem", "S. M.", "" ], [ "Huseynaliyev", "Y. H.", "" ], [ "Vokal", "S.", "" ], [ "Vodopianov", "A. S.", "" ], [ "Abdinov", "O. B.", "" ] ]
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712.0063
Antti Kemppinen
Antti Kemppinen, Antti J. Manninen, Mikko M\"ott\"onen, Juha J. Vartiainen, Joonas T. Peltonen, Jukka P. Pekola
Suppression of the critical current of a balanced SQUID
4 pages, 3 figures
Appl. Phys. Lett. 92, 052110 (2008)
10.1063/1.2842413
null
cond-mat.mes-hall cond-mat.supr-con
null
We present an experimental study of the magnetic flux dependence of the critical current of a balanced SQUID with three Josephson junctions in parallel. Unlike for ordinary dc SQUIDs, the suppression of the critical current does not depend on the exact parameters of the Josephson junctions. The suppression is essentially limited only by the inductances of the SQUID loops. We demonstrate a critical current suppression ratio of higher than 300 in a balanced SQUID with a maximum critical current 30 nA.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:17:40 GMT" } ]
2008-03-11T00:00:00
[ [ "Kemppinen", "Antti", "" ], [ "Manninen", "Antti J.", "" ], [ "Möttönen", "Mikko", "" ], [ "Vartiainen", "Juha J.", "" ], [ "Peltonen", "Joonas T.", "" ], [ "Pekola", "Jukka P.", "" ] ]
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712.0064
Heiko Seeger M.
M. Fidorra, T. Heimburg and H.M. Seeger
Melting of Single Lipid Components in Binary Lipid Mixtures: A Comparison between FTIR Spectroscopy, DSC and Monte Carlo Simulations
12 pages, 5 figures, corrected typo in table 1 in which previously it said Tm,1 instead of Tm,2
Biochimica et Biophysica Acta 1788 (2009) 600-607
10.1016/j.bbamem.2008.12.003
null
physics.bio-ph
null
Monte Carlo (MC) Simulations, Differential Scanning Calorimetry (DSC) and Fourier Transform InfraRed (FTIR) spectroscopy were used to study the melting behavior of single lipid components in two-component membranes of 1,2-Dimyristoyl-D54-sn-Glycero-3-Phosphocholine (DMPC-d54) and 1,2-Distearoyl-sn-Glycero-3-Phosphocholine (DSPC). Microscopic information on the temperature dependent melting of the single lipid species could be investigated using FTIR. The microscopic behavior measured could be well described by the results from the MC simulations. These simulations also allowed to calculate heat capacity profiles as determined with DSC. These ones provide macroscopic information about melting enthalpies and entropy changes which are not accessible with FTIR. Therefore, the MC simulations allowed us to link the two different experimental approaches of FTIR and DSC.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 11:38:18 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 16:30:21 GMT" } ]
2009-06-11T00:00:00
[ [ "Fidorra", "M.", "" ], [ "Heimburg", "T.", "" ], [ "Seeger", "H. M.", "" ] ]
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712.0065
Antonio Bianconi
Antonio Bianconi
Linear arrays of non homogeneous Cu sites in the CuO2 plane, a new scenario for pairing mechanisms in a currugated-iron-like plane
19 pages, 8 figures, first international workshop on "Phase Separation in Cuprate Superconductors", held in Erice, Italy, May 6-12, 1992
Phase Separation in Cuprate Superconductors, edited by K. A. Muller and G. Benedek (ISBN 981-02-1274-7) (World Scientific, Singapore, 1993) pag. 125-138
null
null
cond-mat.supr-con cond-mat.mtrl-sci
null
Experimental results obtained by using x-ray absorption spectroscopy show that the configurations of Cu sites in the CuO2 plane of Bi 2:2:1:2 high Tc superconductors are not homogeneous. Different Cu sites are characterized by short 0.23 nm and long 0.245 nm Cu-O(apical) distances. The linear arrays of different Cu sites forming domains with a corrugated-iron like shape is proposed to be a key characteristic of superconducting domains in the CuO2 plane. The wavelength of the modulation is close to the superconducting coherence length. The ordering of the distorted Cu sites is suggested to be evidence for ordering of polarons driven by the pseudo Jahn Teller electron lattice interaction. The Cu L3 XAS experiments on Bi 2:2:1:2 system indicate that the electronic states added by doping, 4% have the a1 symmetry (i.e. with Cu 3d(3z2-r2), the combination of O (planar) 2px,y orbital with a1 symmetry L(a1), and O(apical) 2pz orbital character) and 15% have the b1 symmetry (3d(x2-y2) and the combination of O (planar) 2p(x,y) orbital with b1 symmetry L(b1)). This new scenario supports the pairing mechanisms for high Tc superconductivity in the presence of two components: 1) the more delocalized component with b1 symmetry and 2) the more localized component, with partially a1 symmetry associated with different parts of the Fermi surface.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:46:01 GMT" } ]
2007-12-04T00:00:00
[ [ "Bianconi", "Antonio", "" ] ]
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712.0066
Tetsuo Deguchi
Tetsuo Deguchi
Extension of a Borel subalgebra symmetry into the sl(2) loop algebra symmetry for the twisted XXZ spin chain at roots of unity and the Onsager algebra
18 pages with no figure; submitted to the proceedings of the workshop RAQIS, LAPTH, Annecy, France, September 11-14, 2007
null
null
null
cond-mat.stat-mech
null
We discuss a conjecture that the twisted transfer matrix of the six-vertex model at roots of unity with some discrete twist angles should have the sl(2) loop algebra symmetry. As an evidence of this conjecture, we show the following mathematical result on a subalgebra of the sl(2) loop algebra, which we call a Borel subalgebra: any given finite-dimensional highest weight representation of the Borel subalgebra is extended into that of the sl(2) loop algebra, if the parameters associated with it are nonzero. Thus, if operators commuting or anti-commuting with the twisted transfer matrix of the six-vertex model at roots of unity generate the Borel subalgebra, then they also generate the sl(2) loop algebra. The result should be useful for studying the connection of the sl(2) loop algebra symmetry to the Onsager algebra symmetry of the superintegrable chiral Potts model.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 09:56:18 GMT" } ]
2007-12-04T00:00:00
[ [ "Deguchi", "Tetsuo", "" ] ]
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712.0067
Petit Jean Pierre
Jean-Pierre Petit, Gilles D'Agostini
Bigravity as an interpretation of the cosmic acceleration
14 pages,1 figure
null
null
null
physics.gen-ph
null
A bimetric description of the universe is proposed, which explains cosmic acceleration deduced from optically observed high-redshift objects. This phenomenon is classically charged to a mysterious repulsive "dark energy" whose true nature is unknown. This is identified in this model with a set of particles having negative mass and energy. These negative mass particles, emitting negative energy photons, are not observable using optical instruments.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 10:05:28 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 20:29:07 GMT" } ]
2008-12-08T00:00:00
[ [ "Petit", "Jean-Pierre", "" ], [ "D'Agostini", "Gilles", "" ] ]
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712.0068
Imran Anwar
Imran Anwar
Janet's Algorithm
null
Bull. Math. Soc. Sc. Math. Roumanie. 51(99), no.1, 2008
null
null
math.AC
null
We have introduced the Janet's algorithm for the Stanley decomposition of a monomial ideal I in a polynomial ring S = K[x_1,...,x_n] and prove that Janet's algorithm gives the squarefree Stanley decomposition of S/I for a squarefree monomial ideal I. We have also shown that the Janet's algorithm gives a partition of a simplicial complex.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 10:07:02 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 10:52:27 GMT" } ]
2011-01-24T00:00:00
[ [ "Anwar", "Imran", "" ] ]
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712.0069
Alexei Zhedanov
Luc Vinet and Alexei Zhedanov
Generalized Bochner theorem: characterization of the Askey-Wilson polynomials
16 pages
null
null
null
math.CA
null
Assume that there is a set of monic polynomials $P_n(z)$ satisfying the second-order difference equation $$ A(s) P_n(z(s+1)) + B(s) P_n(z(s)) + C(s) P_n(z(s-1)) = \lambda_n P_n(z(s)), n=0,1,2,..., N$$ where $z(s), A(s), B(s), C(s)$ are some functions of the discrete argument $s$ and $N$ may be either finite or infinite. The irreducibility condition $A(s-1)C(s) \ne 0$ is assumed for all admissible values of $s$. In the finite case we assume that there are $N+1$ distinct grid points $z(s), \: s=0,1,..., N$ such that $z(i) \ne z(j), \: i \ne j$. If $N=\infty$ we assume that the grid $z(s)$ has infinitely many different values for different values of $s$. In both finite and infinite cases we assume also that the problem is non-degenerate, i.e. $\lambda_n \ne \lambda_m, n \ne m$. Then we show that necessarily: (i) the grid $z(s)$ is at most quadratic or q-quadratic in $s$; (ii) corresponding polynomials $P_n(z)$ are at most the Askey-Wilson polynomials corresponding to the grid $z(s)$. This result can be considered as generalizing of the Bochner theorem (characterizing the ordinary classical polynomials) to generic case of arbitrary difference operator on arbitrary grids.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 10:19:36 GMT" } ]
2007-12-04T00:00:00
[ [ "Vinet", "Luc", "" ], [ "Zhedanov", "Alexei", "" ] ]
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712.007
Massimo Di Toro
M.Di Toro, M.Colonna, G.Ferini, V.Greco, J.Rizzo, V.Baran, T.Gaitanos, Liu Bo, G.Lalazissis, V.Prassa, H.H. Wolter
Isospin Effects on Meson Production in Relativistic Heavy Ion Collisions
8 pages, 3 figures; HADRON07, XII Int.Conf. on Hadron Spectroscopy, Frascati Oct. 2007. Latex frascatiphys.sty
null
null
null
nucl-th
null
We show that the phenomenology of isospin effects on heavy ion reactions at intermediate energies (few AGeV range) is extremely rich and can allow a ``direct'' study of the covariant structure of the isovector interaction in a high density hadron medium. We work within a relativistic transport frame, beyond a cascade picture, consistently derived from effective Lagrangians, where isospin effects are accounted for in the mean field and collision terms. We show that rather sensitive observables are provided by the pion/kaon production (\pi^-/\pi^+, K^0/K^+ yields). Relevant non-equilibrium effects are stressed. The possibility of the transition to a mixed hadron-quark phase, at high baryon and isospin density, is finally suggested. Some signatures could come from an expected ``neutron trapping'' effect.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 10:45:08 GMT" } ]
2007-12-04T00:00:00
[ [ "Di Toro", "M.", "" ], [ "Colonna", "M.", "" ], [ "Ferini", "G.", "" ], [ "Greco", "V.", "" ], [ "Rizzo", "J.", "" ], [ "Baran", "V.", "" ], [ "Gaitanos", "T.", "" ], [ "Bo", "Liu", "" ], [ "Lalazissis", "G.", "" ], [ "Prassa", "V.", "" ], [ "Wolter", "H. H.", "" ] ]
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712.0071
Ploszajczak
J. Okolowicz, M. Ploszajczak, Yan-an Luo
Continuum Coupling Effects in Spectra of Mirror Nuclei and Binding Systematics
Proc. XXX Mazurian Lakes Conference on Physics: Nuclear Physics and Fundamental Processes 15 pages, 5 figures
ActaPhys.Polon.B39:389-400,2008
null
null
nucl-th
null
Continuum-coupling correction to binding energies in neutron rich oxygen and fluorine isotopes and to excitation energies of 2+ states in 36Ca and 36S mirror nuclei are studied using the real-energy continuum shell model.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:13:31 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 14:40:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Okolowicz", "J.", "" ], [ "Ploszajczak", "M.", "" ], [ "Luo", "Yan-an", "" ] ]
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712.0072
Didier Piau
Jean B\'erard, Didier Piau
Coupling times with ambiguities for particle systems and applications to context-dependent DNA substitution models
33 pages
null
null
null
math.PR q-bio.QM
null
We define a notion of coupling time with ambiguities for interacting particle systems, and show how this can be used to prove ergodicity and to bound the convergence time to equilibrium and the decay of correlations at equilibrium. A motivation is to provide simple conditions which ensure that perturbed particle systems share some properties of the underlying unperturbed system. We apply these results to context-dependent substitution models recently introduced by molecular biologists as descriptions of DNA evolution processes. These models take into account the influence of the neighboring bases on the substitution probabilities at a site of the DNA sequence, as opposed to most usual substitution models which assume that sites evolve independently of each other.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:13:34 GMT" } ]
2007-12-04T00:00:00
[ [ "Bérard", "Jean", "" ], [ "Piau", "Didier", "" ] ]
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712.0073
Alexei Kolezhuk
E. G. Galkina, A. Yu. Galkin, B. A. Ivanov
Solitons in isotropic antiferromagnets: beyond a sigma model
7 pages, 1 figure; a contribution to the special FNT issue in memory of A.M.Kosevich
Low Temp. Phys (Kharkov) vol. 34, #7, 662-668 (2008)
10.1063/1.2957004
null
cond-mat.other cond-mat.str-el
null
Isotropic antiferromagnets shows a reach variety of magnetic solitons with non-trivial static and dynamic properties. One-dimensional soliton elementary excitations have a periodic dispersion law. For two-dimensional case, planar antiferromagnetic vortices having non-singular macroscopic core with the saturated magnetic moment are present. The dynamic properties of these planar antiferromagnetic vortex are characterized by presence of a gyroforce
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:32:52 GMT" } ]
2010-11-09T00:00:00
[ [ "Galkina", "E. G.", "" ], [ "Galkin", "A. Yu.", "" ], [ "Ivanov", "B. A.", "" ] ]
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712.0074
Andrea Gregori
Andrea Gregori
A note on the phases of natural evolution
LaTex, 22 pages, 8 figures
null
null
null
physics.gen-ph q-bio.PE
null
The natural evolution of life seems to proceed through steps characterized by phases of relatively rapid changes, followed by longer, more stable periods. In the light of the string-theory derived physical scenario proposed in [1], we discuss how this behaviour can be related to a sequence of resonances of the energy of natural sources of radiation and absorption energies of the DNA, responsible for mutagenesis. In a scenario in which these energy scales run independently as functions of the age of the Universe, the conditions for evolutionary mutagenesis are satisfied only at discrete points of the time axis, and for a short period, corresponding to the width of the resonance. We consider in particular the evolution of the primates through subsequent steps of increasing cranio-facial contraction, and the great Eras of life (Paleozoic, Mesozoic, Cenozoic), showing that the transitions occur at the predicted times of resonance.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:39:30 GMT" } ]
2007-12-06T00:00:00
[ [ "Gregori", "Andrea", "" ] ]
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712.0075
Skokov Vladimir
V. Gogokhia, V. SKokov
The non-perturbative equation of state for gluon matter
12 pages, 3 figures
null
null
null
hep-ph
null
In order to derive equation of state for the pure SU(3) Yang-Mills fields from first principles, it is proposed to generalize the effective potential approach for composite operators to non-zero temperatures. It is essentially non-perturbative by construction, since it assumes the summation of an infinite number of the corresponding contributions. There is no dependence on the coupling constant, only a dependence on the mass gap, which is responsible for the large-scale structure of the QCD ground state. The equation of state generalizes the Bag constant at non-zero temperatures, while its nontrivial Yang-Mills part has been approximated by the generalization of the free gluon propagator to non-zero temperatures, as a first necessary step. Even in this case we were able to show explicitly that the pressure may almost continuously change its regime at $T^* = 266.5 MeV$.All the other thermodynamical quantities such as energy density, entropy, etc. are to be understood to have drastic changes in their regimes in the close vicinity of $T^*$. All this is in qualitative and quantitative agreement with thermal lattice QCD results for the pure Yang-Mills fields. We have firmly established the behavior of all the thermodynamical quantities in the region of low temperatures, where thermal lattice QCD calculations suffer from big uncertainties.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:52:10 GMT" } ]
2007-12-04T00:00:00
[ [ "Gogokhia", "V.", "" ], [ "SKokov", "V.", "" ] ]
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712.0076
Constantin Bachas
C. Bachas and I. Brunner
Fusion of conformal interfaces
28 pages, 4 figures. Minor clarifications in v2. Sign Mistakes corrected and reference added in v3
JHEP0802:085,2008
10.1088/1126-6708/2008/02/085
null
hep-th cond-mat.stat-mech
null
We study the fusion of conformal interfaces in the c=1 conformal field theory. We uncover an elegant structure reminiscent of that of black holes in supersymmetric theories. The role of the BPS black holes is played by topological interfaces, which (a) minimize the entropy function, (b) fix through an attractor mechanism one or both of the bulk radii, and (c) are (marginally) stable under splitting. One significant difference is that the conserved charges are logarithms of natural numbers, rather than vectors in a charge lattice, as for BPS states. Besides potential applications to condensed-matter physics and number theory, these results point to the existence of large solution-generating algebras in string theory.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 11:53:18 GMT" }, { "version": "v2", "created": "Sun, 9 Dec 2007 14:17:28 GMT" }, { "version": "v3", "created": "Tue, 4 Mar 2008 15:23:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Bachas", "C.", "" ], [ "Brunner", "I.", "" ] ]
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712.0077
Youngsub Yoon
Youngsub Yoon
D-brane width
4 pages, no figures, argument based on loop quantum gravity added
null
null
null
physics.gen-ph
null
Loop quantum gravity predicts that there are non-zero minimal area, and non-zero minimal volume in (3+1) dimensions. Given this, one can easily guess that one will have a non-zero minimal 9-volume in (9+1) dimensions. Therefore, in this paper, we argue that not only D9-brane but also Dp-brane for p less than 9 has a 9-volume. This idea is new, as the present view states that such a Dp-brane has p-volume but no 9 volume. To demonstrate this, first, we equate D8-brane action with D9-brane action and show that 9th direction which is perpendicular to D8-brane has non-zero width. We repeat this step for different ps; we equate Dp-brane action with Dp-1 brane action. By this iteration and induction we conclude that Dp-brane has non-zero widths for each of (9-p) directions perpendicular to the Dp-brane, and therefore, non-zero volume. When antisymmetric tensor and field strength are zero, this width is calculated to be 2 pi sqrt(alpha') for all (9-p) directions. For non-vanishing antisymmetric tensor and field strength, the width receives small corrections. In this paper, we only calculate up to the first order correction.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 12:00:14 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 01:16:34 GMT" } ]
2008-04-15T00:00:00
[ [ "Yoon", "Youngsub", "" ] ]
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712.0078
Aleksandr Pukhlikov
Aleksandr Pukhlikov
Birational geometry of Fano double covers
27 pages, LaTeX
null
10.1070/SM2008v199n08ABEH003960
null
math.AG
null
We prove divisorial canonicity of Fano double hypersurfaces of general position.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 17:46:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Pukhlikov", "Aleksandr", "" ] ]
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