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712.0079
Enrico Calzavarini
Guenter Ahlers, Enrico Calzavarini, Francisco Fontenele Araujo, Denis Funfschilling, Siegfried Grossmann, Detlef Lohse and Kazuyasu Sugiyama
Non-Oberbeck-Boussinesq effects in turbulent thermal convection in ethane close to the critical point
18 pages, 15 figures, 3 tables
Phys. Rev. E 77, 046302 (2008)
10.1103/PhysRevE.77.046302
null
physics.flu-dyn
null
As shown in earlier work (Ahlers et al., J. Fluid Mech. 569, p.409 (2006)), non-Oberbeck Boussinesq (NOB) corrections to the center temperature in turbulent Rayleigh-Benard convection in water and also in glycerol are governed by the temperature dependences of the kinematic viscosity and the thermal diffusion coefficient. If the working fluid is ethane close to the critical point the origin of non-Oberbeck-Boussinesq corrections is very different, as will be shown in the present paper. Namely, the main origin of NOB corrections then lies in the strong temperature dependence of the isobaric thermal expansion coefficient \beta(T). More precisely, it is the nonlinear T-dependence of the density \rho(T) in the buoyancy force which causes another type of NOB effect. We demonstrate that through a combination of experimental, numerical, and theoretical work, the latter in the framework of the extended Prandtl-Blasius boundary layer theory developed in Ahlers et al., J. Fluid Mech. 569, p.409 (2006). The latter comes to its limits, if the temperature dependence of the thermal expension coefficient \beta(T) is significant.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 23:39:41 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 09:25:37 GMT" }, { "version": "v3", "created": "Fri, 22 Feb 2008 10:51:06 GMT" } ]
2008-04-09T00:00:00
[ [ "Ahlers", "Guenter", "" ], [ "Calzavarini", "Enrico", "" ], [ "Araujo", "Francisco Fontenele", "" ], [ "Funfschilling", "Denis", "" ], [ "Grossmann", "Siegfried", "" ], [ "Lohse", "Detlef", "" ], [ "Sugiyama", "Kazuyasu", "" ] ]
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712.008
Daniel G. Barci
Daniel G. Barci and Luis E. Oxman
Universal Landauer conductance in chiral symmetric 2d systems
6 pages, no figures
Phys. Rev. B 77, 125128 (2008).
10.1103/PhysRevB.77.125128
null
cond-mat.mes-hall cond-mat.str-el hep-th
null
We study transport properties of an arbitrarily shaped ultraclean graphene sheet, adiabatically connected to leads,composed by the same material. If the localized interactions do not destroy chiral symmetry, we show that the conductance is quantized, since it is dominated by the quasi one-dimensional leads. As an example, we show that smooth structural deformations of the graphene plane do not modify the conductance quantization.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 13:23:46 GMT" } ]
2008-03-27T00:00:00
[ [ "Barci", "Daniel G.", "" ], [ "Oxman", "Luis E.", "" ] ]
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712.0081
Sergy Ratkevich
S.S.Ratkevich, I.D.Fedorets, B.A.Nemashkalo, V.E. Storizhko
Radiative Strength Functions for Dipole Transitions in 57, 59Co
6 pages, 6 figures
Phys.Atom.Nucl.63:1497-1503,2000
10.1134/1.1312882
null
nucl-ex
null
Average-resonance data on the (p,gamma) reaction on 56,58Fe that were taken at proton energies of Ep=1.5-3.0 MeV are used to determine the absolute values of the radiative strength functions for energies below 10 MeV. The results obtained in this way are compared with the results of the calculations that rely on the statistical approach and which take into account the temperature of the nucleus and its shell structure. Good agreement with experimental data is achieved without any variation of parameters.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 13:56:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Ratkevich", "S. S.", "" ], [ "Fedorets", "I. D.", "" ], [ "Nemashkalo", "B. A.", "" ], [ "Storizhko", "V. E.", "" ] ]
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712.0082
Kotub Uddin
Shinji Tsujikawa, Kotub Uddin and Reza Tavakol
Density perturbations in f(R) gravity theories in metric and Palatini formalisms
36 pages including 8 figures. Accepted for publication in Physical Review D
Phys.Rev.D77:043007,2008
10.1103/PhysRevD.77.043007
null
astro-ph gr-qc hep-ph hep-th
null
We make a detailed study of matter density perturbations in both metric and Palatini formalisms in theories whose Lagrangian density is a general function, f(R), of the Ricci scalar. We derive these equations in a number of gauges. We show that for viable models that satisfy cosmological and local gravity constraints (LGC), matter perturbation equations derived under a sub-horizon approximation are valid even for super-Hubble scales provided the oscillating mode (scalaron) does not dominate over the matter-induced mode. Such approximate equations are especially reliable in the Palatini formalism because of the absence of scalarons. Using these equations we make a comparative study of the behaviour of density perturbations as well as gravitational potentials for a number of classes of theories. In the metric formalism the parameter m=Rf_{,RR}/f_{,R} characterising the deviation from the Lambda CDM model is constrained to be very small during the matter era in order to ensure compatibility with LGC, but the models in which m grows to the order of 10^{-1} around the present epoch can be allowed. These models also suffer from an additional fine tuning due to the presence of scalaron modes which are absent in the Palatini case. In Palatini formalism LGC and background cosmological constraints provide only weak bounds on |m| by constraining it to be smaller than ~ 0.1. This is in contrast to matter density perturbations which, on galactic scales, place far more stringent constraints on the present deviation parameter m of the order of |m| < 10^{-5} - 10^{-4}. This is due to the peculiar evolution of matter perturbations in the Palatini case which exhibits a rapid growth or a damped oscillation depending on the sign of m.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 14:11:11 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 03:00:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Tsujikawa", "Shinji", "" ], [ "Uddin", "Kotub", "" ], [ "Tavakol", "Reza", "" ] ]
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712.0083
Petr Jizba
Petr Jizba and Hagen Kleinert
Smearing Distributions and their use in Financial Markets
6 pages. Presented at the International Conference: Path Integrals - New Trends and Perspectives, Dresden, Germany, September 23 - 28, 2007
null
10.1142/9789812837271_0089
null
q-fin.ST cond-mat.stat-mech physics.soc-ph
null
It is shown that superpositions of path integrals with arbitrary Hamiltonians and different scaling parameters v ("variances") obey the Chapman-Kolmogorov relation for Markovian processes if and only if the corresponding smearing distributions for v have a specific functional form. Ensuing "smearing" distributions substantially simplify the coupled system of Fokker-Planck equations for smeared and un-smeared conditional probabilities. Simple application in financial models with stochastic volatility is presented.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 16:17:53 GMT" } ]
2017-08-23T00:00:00
[ [ "Jizba", "Petr", "" ], [ "Kleinert", "Hagen", "" ] ]
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712.0084
Gilles Champenois
Gilles Champenois
From vectors to mnesors
null
null
null
null
cs.LO cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The mnesor theory is the adaptation of vectors to artificial intelligence. The scalar field is replaced by a lattice. Addition becomes idempotent and multiplication is interpreted as a selection operation. We also show that mnesors can be the foundation for a linear calculus.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 14:37:07 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 21:26:54 GMT" }, { "version": "v3", "created": "Wed, 23 Jul 2008 07:38:39 GMT" }, { "version": "v4", "created": "Sun, 24 May 2009 17:12:25 GMT" } ]
2009-05-24T00:00:00
[ [ "Champenois", "Gilles", "" ] ]
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712.0085
Laszlo B. Szabados
Laszlo B Szabados
On some global problems in the tetrad approach to quasi-local quantities
13 pages, a more detailed discussion of the problems is given, Theorems 3.1 and 3.2 are modified slightly, the proof of Theorem 4.3 is improved, 5 references are added, misprints are corrected. Appearing in Class. Quantum Grav
Class.Quant.Grav.25:195004,2008
10.1088/0264-9381/25/19/195004
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The potential global topological obstructions to the tetrad approach to finding the quasi-local conserved quantities, associated with closed, orientable spacelike 2-surfaces S, are investigated. First we show that the Lorentz frame bundle is always globally trivializable over an open neighbourhood U of any such S if an open neighbourhood of S is space and time orientable, and hence a globally trivializable SL(2,C) spin frame bundle can also be introduced over U. Then it is shown that all the spin frames belonging to the same spinor structure on S have always the same homotopy class. On the other hand, on a 2-surface with genus g, there are $2^{2g}$ homotopically different Lorentz frame fields, and there is a natural one-to-one correspondence between these homotopy classes and the different SL(2,C) spinor structures.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 14:48:39 GMT" }, { "version": "v2", "created": "Wed, 6 Aug 2008 16:08:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Szabados", "Laszlo B", "" ] ]
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712.0086
Takashi Okamoto
Takashi Okamoto (Durham)
Galaxy Formation
15 pages, 3 figures, invited review talk, to appear in the ASP conference proceedings of the "Frank N. Bash Symposium 2007: New Horizons in Astronomy", editors: A. Frebel, J. Maund, J. Shen, M. Siegel
ASPC, 393, 111 (2008)
null
TO-11-07
astro-ph
null
I review the current status of theoretical studies of galaxy formation. I outline the importance of the physics of baryonic component in galaxy formation by showing results obtained by using two major tools, semi-analytical approaches and cosmological simulations. In particular, I emphasis on roles of feedback in galaxy formation and discuss whether apparent conflictions between the standard theory of structure formation, the cold dark matter model, and observations can be solved by the feedback. I also discuss future prospects in numerical simulations of galaxy formation.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 14:51:08 GMT" } ]
2008-07-18T00:00:00
[ [ "Okamoto", "Takashi", "", "Durham" ] ]
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712.0087
Peter Van
C. Papenfuss and P. V\'an
Scalar, vectorial and tensorial damage parameters from the mesoscopic background
14 pages, 2 figures
Proceedings of Estonian Academy of Sciences, 2008, V57/3, p132-141
10.3176/proc.2008.3.03
null
cond-mat.other cond-mat.mtrl-sci
null
In the mesoscopic theory a distribution of different crack sizes and crack orientations is introduced. A scalar damage parameter, a second order damage tensor and a vectorial damage parameter are defined in terms of this distribution function. As an example of a constitutive quantity the free energy density is given as a function of the damage tensor. This equation is reduced in the uniaxial case to a function of the damage vector and in case of a special geometry to a function of the scalar damage parameter.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 14:52:01 GMT" } ]
2016-05-20T00:00:00
[ [ "Papenfuss", "C.", "" ], [ "Ván", "P.", "" ] ]
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712.0088
Peter Filip
Peter Filip
Elliptic Flow in Central Collisions of Deformed Nuclei
12 pages, 11 figures, to appear in the proceedings of RNP2007, Kiev 18.-22.6
Phys.Atom.Nucl.71:1609-1618,2008
10.1134/S1063778808090172
null
nucl-th
null
Non-trivial geometrical effects in relativistic central collisions of deformed nuclei are studied using a simple version of optical Glauber model. For very small impact parameters large centrality and eccentricity fluctuations are observed. In very high multiplicity collisions of oblate nuclei (e.g. Au and Cu) significant fraction of events with elliptic flow strength v_2 dependent on oblateness beta_2 is predicted.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 14:52:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Filip", "Peter", "" ] ]
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712.0089
Bruno Julia Diaz
B. Julia-Diaz
Dynamical Coupled-Channels Model Analysis of \pi-N Scattering and Electromagnetic Pion Production Reactions
Invited talk. 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, Sept. 10th-14th 2007 (MENU 2007), Juelich, Germany
ECONFC070910:144,2007
null
null
nucl-th
null
The ability of the coupled-channels model (MSL) developed in recently in Ref. \cite{msl} to account simultaneously for the $\pi N$ scattering data and the $\pi$ photoproduction reactions on the nucleon is presented. An accurate description of $\pi N$ scattering has been obtained. A preliminary description of $\pi$ photoproduction is also discussed.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 15:00:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Julia-Diaz", "B.", "" ] ]
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712.009
Seok Kim
Seok Kim, Sungjay Lee
The Geometry of Dyonic Instantons in 5-dimensional Supergravity
35 pages, no figures
null
null
Imperial/TP/07/SK/01, SNUTP07-006
hep-th
null
We systematically construct and study smooth supersymmetric solutions in 5 dimensional N=1 Yang-Mills-Einstein supergravity. Our solution is based on the ADHM construction of (dyonic) multi-instantons in Yang-Mills theory, which extends to the gravity-coupled system. In a simple supergravity model obtained from N=2 theory, our solutions are regular ring-like configurations, which can also be interpreted as supertubes. By studying the SU(2) 2-instanton example in detail, we find that angular momentum is maximized, with fixed electric charge, for circular rings. This feature is qualitatively same as that of supertubes. Related to the existence of this upper bound of angular momentum, we also check the absence of closed timelike curves for the circular rings. Finally, in supergravity and gauge theory models with non-Abelian Chern-Simons terms, we point out that the solution in the symmetric phase carries electric charge which does not contribute to the energy. A possible explanation from the dynamics on the instanton moduli space is briefly discussed.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 10:57:36 GMT" } ]
2007-12-04T00:00:00
[ [ "Kim", "Seok", "" ], [ "Lee", "Sungjay", "" ] ]
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712.0091
Philippe G. LeFloch
Philippe G. LeFloch and Knut Smoczyk
The hyperbolic mean curvature flow
26 pages
null
null
null
math.DG math.AP
null
We introduce a geometric evolution equation of hyperbolic type, which governs the evolution of a hypersurface moving in the direction of its mean curvature vector. The flow stems from a geometrically natural action containing kinetic and internal energy terms. As the mean curvature of the hypersurface is the main driving factor, we refer to this model as the hyperbolic mean curvature flow (HMCF). The case that the initial velocity field is normal to the hypersurface is of particular interest: this property is preserved during the evolution and gives rise to a comparatively simpler evolution equation. We also consider the case where the manifold can be viewed as a graph over a fixed manifold. Our main results are as follows. First, we derive several balance laws satisfied by the hypersurface during the evolution. Second, we establish that the initial-value problem is locally well-posed in Sobolev spaces; this is achieved by exhibiting a convexity property satisfied by the energy density which is naturally associated with the flow. Third, we provide some criteria ensuring that the flow will blow-up in finite time. Fourth, in the case of graphs, we introduce a concept of weak solutions suitably restricted by an entropy inequality, and we prove that a classical solution is unique in the larger class of entropy solutions. In the special case of one-dimensional graphs, a global-in-time existence result is established.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 15:58:48 GMT" } ]
2007-12-04T00:00:00
[ [ "LeFloch", "Philippe G.", "" ], [ "Smoczyk", "Knut", "" ] ]
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712.0092
Danilo Liarte
D. B. Liarte, C. S. O. Yokoi
Antiferromagnetic spherical spin-glass model
12 pages, 6 figures
J. Phys. A: Math. Theor. 41 (2008) 324010
10.1088/1751-8113/41/32/324010
null
cond-mat.dis-nn cond-mat.stat-mech
null
We study the thermodynamic properties and the phase diagrams of a multi-spin antiferromagnetic spherical spin-glass model using the replica method. It is a two-sublattice version of the ferromagnetic spherical p-spin glass model. We consider both the replica-symmetric and the one-step replica-symmetry-breaking solutions, the latter being the most general solution for this model. We find paramagnetic, spin-glass, antiferromagnetic and mixed or glassy antiferromagnetic phases. The phase transitions are always of second order in the thermodynamic sense, but the spin-glass order parameter may undergo a discontinuous change.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 16:18:34 GMT" } ]
2012-05-22T00:00:00
[ [ "Liarte", "D. B.", "" ], [ "Yokoi", "C. S. O.", "" ] ]
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712.0093
Gwenael Massuyeau
Kazuo Habiro, Gwenael Massuyeau
Symplectic Jacobi diagrams and the Lie algebra of homology cylinders
42 pages, with some figures. Minor changes with respect to the first version
J. Topology 2:3 (2009) 527-569
10.1112/jtopol/jtp020
null
math.GT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let S be a compact connected oriented surface, whose boundary is connected or empty. A homology cylinder over the surface S is a cobordism between S and itself, homologically equivalent to the cylinder over S. The Y-filtration on the monoid of homology cylinders over S is defined by clasper surgery. Using a functorial extension of the Le-Murakami-Ohtsuki invariant, we show that the graded Lie algebra associated to the Y-filtration is isomorphic to the Lie algebra of ``symplectic Jacobi diagrams.'' This Lie algebra consists of the primitive elements of a certain Hopf algebra whose multiplication is a diagrammatic analogue of the Moyal-Weyl product. The mapping cylinder construction embeds the Torelli group into the monoid of homology cylinders, sending the lower central series to the Y-filtration. We give a combinatorial description of the graded Lie algebra map induced by this embedding, by connecting Hain's infinitesimal presentation of the Torelli group to the Lie algebra of symplectic Jacobi diagrams. This Lie algebra map is shown to be injective in degree two, and the question of the injectivity in higher degrees is discussed.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 16:30:45 GMT" }, { "version": "v2", "created": "Mon, 6 Jul 2009 09:31:38 GMT" } ]
2014-02-26T00:00:00
[ [ "Habiro", "Kazuo", "" ], [ "Massuyeau", "Gwenael", "" ] ]
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712.0094
Philippe G. LeFloch
Cezar Kondo and Philippe G. LeFloch
Zero diffusion-dispersion limits for scalar conservation laws
11 pages
SIAM Math. Anal. 33 (2002), 1320--1329
null
null
math.AP
null
We consider solutions of hyperbolic conservation laws regularized with vanishing diffusion and dispersion terms. Following a pioneering work by Schonbek, we establish the convergence of the regularized solutions toward discontinuous solutions of the hyperbolic conservation law. The proof relies on the method of compensated compactness in the $L^2$ setting. Our result improves upon Schonbek's earlier results and provides an optimal condition on the balance between the relative sizes of the diffusion and the dispersion parameters. A convergence result is also established for multi-dimensional conservation laws by relying on DiPerna's uniqueness theorem for entropy measure-valued solutions.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 16:58:47 GMT" } ]
2007-12-04T00:00:00
[ [ "Kondo", "Cezar", "" ], [ "LeFloch", "Philippe G.", "" ] ]
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712.0095
Anibal Medina
Marcela Carena, Anibal D. Medina, Boris Panes, Nausheen R. Shah and Carlos E.M. Wagner
Collider Phenomenology of Gauge-Higgs Unification Scenarios in Warped Extra Dimensions
40 pages, 20 figures
Phys.Rev.D77:076003,2008
10.1103/PhysRevD.77.076003
ANL-HEP-PR-07-101, EFI-07-35, FERMILAB-PUB-07-630-T
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the couplings of the zero modes and first excited states of gluons, $W$'s, $Z$ gauge bosons, as well as the Higgs, to the zero modes and first excited states of the third generation quarks, in an RS Gauge-Higgs unification scenario based on a bulk $SO(5)\times U(1)_X$ gauge symmetry, with gauge and fermion fields propagating in the bulk. Using the parameter space consistent with electroweak precision tests and radiative electroweak symmetry breaking, we study numerically the dependence of these couplings on the parameters of our model. Furthermore, after emphasizing the presence of light excited states of the top quark, which couple strongly to the Kaluza Klein gauge bosons, the associated collider phenomenology is analyzed. In particular, we concentrate on the possible detection of the first excited state of the top, $t^1$, which tends to have a higher mass than the ones accessible via regular QCD production processes. We stress that the detection of these particles is still possible due to an increase in the pair production of $t^1$ induced by the first excited state of the gluon, $G^1$.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 17:19:57 GMT" }, { "version": "v2", "created": "Wed, 9 Jul 2008 17:44:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Carena", "Marcela", "" ], [ "Medina", "Anibal D.", "" ], [ "Panes", "Boris", "" ], [ "Shah", "Nausheen R.", "" ], [ "Wagner", "Carlos E. M.", "" ] ]
[ 0.004011292, 0.0120051093, -0.076198563, 0.0319880545, -0.0784998611, 0.0001979676, 0.0026369051, 0.0393266417, -0.0249435231, -0.0024163639, -0.0097869132, 0.037536744, -0.1254975051, 0.0318602063, 0.0646409318, 0.0497336276, -0.0535435565, 0.0760962889, 0.0732835904, 0.0356701352, -0.0796249434, -0.0388919525, 0.055077754, 0.045105461, -0.0524184778, -0.0659194291, 0.0343916342, -0.0252120085, 0.1108714715, 0.0647943541, 0.0887790024, -0.0146004632, -0.0783464462, -0.108416751, -0.0615213923, 0.0946089551, -0.0782441646, 0.1067802757, -0.0405540019, 0.04091198, -0.0707777292, 0.003343276, -0.0833070204, 0.094864659, 0.0194843318, 0.0244960487, -0.0351843052, 0.0565608144, -0.0236266702, -0.0124717616, -0.0150223682, -0.0103622377, 0.0286895279, 0.0065778797, -0.0961431563, -0.0122032771, 0.0297890361, 0.0074025118, -0.0170168281, -0.0235243887, -0.0155976927, -0.0923587978, -0.035107594, 0.0568676554, -0.0310419668, -0.0771190822, 0.0111613004, 0.0268740579, -0.0501427464, 0.0634647086, 0.027845718, -0.0416790806, 0.0487619676, 0.080698885, 0.0706243068, 0.0118900444, -0.033829093, 0.0070573166, -0.0370764844, 0.0283059776, -0.0398124717, 0.0147922384, -0.0291242171, -0.0155849084, -0.0214404352, 0.0366417952, -0.0084508816, 0.0578393154, -0.0838184208, -0.0020360104, 0.0737949833, 0.0514979586, -0.048480697, -0.0284338277, 0.0253142882, -0.1059620306, 0.121610865, -0.0455145799, -0.0312465262, 0.0390198007, 0.0325761661, 0.0522139147, 0.0983933136, -0.1093372703, 0.1449306905, -0.1045812517, -0.0268229172, -0.0026656713, -0.0137182986, -0.0284849666, 0.0162241571, 0.025301503, -0.098904714, 0.0866311193, -0.0444917791, -0.0854037628, -0.0419092104, -0.0048359241, -0.0557425767, 0.1181333438, 0.0021127204, -0.0328574367, 0.0693458095, -0.0287918076, -0.0045994017, -0.1514766067, 0.036079254, -0.1125079468, -0.0956828967, 0.0136160189, 0.0762497038, -0.0398891829, -0.0445429198, 0.0412443914, -0.0709311515, 0.006686552, 0.0622884929, -0.0760451481, -0.0180268418, -0.0198806655, 0.0334711149, -0.0132708242, 0.0692435279, 0.0471510589, 0.006402086, 0.1015639976, -0.0348518938, 0.0922053754, 0.0583507121, -0.0701640472, -0.0748177841, -0.0556914359, 0.0855571851, -0.0319880545, -0.0237928741, -0.1275431067, -0.011832512, 0.1049392298, -0.0034934997, -0.1116897091, 0.0627998933, 0.0483784191, -0.0612656921, 0.050603006, 0.0997740924, -0.0086810114, -0.1026379317, -0.000481435, -0.1195652634, -0.0983421728, -0.0231152698, -0.0087896837, -0.11465583, 0.0340336561, 0.037229903, 0.0148817329, -0.0264649373, -0.1268271357, -0.0532878563, 0.0151118636, 0.0848923624, 0.0262092389, -0.0335478261, 0.0016364793, -0.1875814348, 0.0264393687, 0.023128055, 0.0458981283, 0.0023748127, -0.0204815604, -0.0456424281, 0.0667376667, 0.0740506873, 0.1213040277, 0.0827444792, -0.0893926769, 0.0269251987, 0.1407372206, 0.0225399453, -0.0035542285, -0.0311442465, 0.028996367, 0.1388961822, -0.1332707852, -0.0110590197, 0.0154698426, 0.1186447442, -0.0313232355, -0.0784487277, -0.0399403237, 0.0031594918, -0.0247389637, 0.126008898, 0.0064979731, -0.0531344377, 0.0287662372, -0.0789089873, 0.0799317807, 0.1310206205, 0.0723630711, -0.0973193794, 0.091335997, 0.0491710864, 0.047994867, 0.0820796639, -0.0254165679, -0.0595780723, -0.0133603187, 0.0442105085, 0.0850457847, 0.0359769724, 0.0093458304, -0.0316812173, 0.0101704625, 0.0003180267, 0.0104389479, -0.0002501064, -0.0573790558, 0.0189090073, -0.0322437547, -0.0600894727, -0.027845718, 0.0333688334, 0.0984444544, -0.0041774968, 0.016403148, -0.0180907678, -0.0821819454, 0.1158831865, 0.052674178, 0.036744073, 0.0543617941, 0.022642225, 0.043034289, -0.050551869, 0.0582484342 ]
712.0096
Florentin Smarandache
Rajesh Singh, Pankaj Chauhan, Nirmala Sawan, Florentin Smarandache
Auxiliary Information and A Priori Values in Construction of Improved Estimators
74 pages
Third paper published in Bulletin of Statistics & Economics, Vol. 3, No. A09, pp. 13-18, Fall 2009.
null
null
stat.ME
null
This volume is a collection of six papers on the use of auxiliary information and 'a priori' values in construction of improved estimators. The work included here will be of immense application for researchers and students who emply auxiliary information in any form.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 17:21:26 GMT" } ]
2010-02-19T00:00:00
[ [ "Singh", "Rajesh", "" ], [ "Chauhan", "Pankaj", "" ], [ "Sawan", "Nirmala", "" ], [ "Smarandache", "Florentin", "" ] ]
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712.0097
Yuriy Reznik
G. L. Khodak
Redundancy Estimates for Word-Based Encoding of Sequences Produced by a Bernoulli Source
null
null
null
null
cs.IT math.IT
null
The efficiency of a code is estimated by its redundancy $R$, while the complexity of a code is estimated by its average delay $\bar N$. In this work we construct word-based codes, for which $R \lesssim \bar N^{-5/3}$. Therefore, word-based codes can attain the same redundancy as block-codes while being much less complex. We also consider uniform on the output codes, the benefit of which is the lack of a running synchronization error. For such codes $\bar N^{-1} \lesssim R \lesssim \bar N^{-1}$, except for a case when all input symbols are equiprobable, when $R \leqslant \bar N^{-2}$ for infinitely many $\bar N$.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 17:36:44 GMT" } ]
2007-12-04T00:00:00
[ [ "Khodak", "G. L.", "" ] ]
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712.0098
Ioan Bejenaru
Ioan Bejenaru, Daniel Tataru
Global wellposedness in the energy space for the Maxwell-Schr\"odinger system
null
null
null
null
math.AP
null
We prove that the Maxwell-Schr\"odinger system in $\R^{3+1}$ is globally well-posed in the energy space. The key element of the proof is to obtain a short time wave packet parametrix for the magnetic Schr\"odinger equation, which leads to linear, bilinear and trilinear estimates. These, in turn, are extended to larger time scales via a bootstrap argument.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 17:40:12 GMT" } ]
2007-12-04T00:00:00
[ [ "Bejenaru", "Ioan", "" ], [ "Tataru", "Daniel", "" ] ]
[ -0.0009700781, 0.0184522495, 0.0030555974, 0.1041395068, -0.0393252447, -0.0143583417, -0.0392777771, -0.0362162478, -0.043336086, -0.0780809, -0.0534937233, 0.0397998989, -0.1064178571, 0.0448312536, -0.0100983046, 0.1042344421, -0.0203983374, -0.0088285999, 0.0566264503, 0.0208492614, -0.0639836192, -0.1390741915, 0.0453059077, 0.0501236655, -0.0734292716, -0.0221189652, 0.0015114824, 0.051215373, 0.0946463943, 0.060708493, 0.0231513418, -0.0265569985, -0.0862924457, -0.016197633, -0.086387381, 0.1180943921, -0.1182842553, 0.064790532, -0.0785080865, -0.091656059, -0.0274825785, -0.0033552242, -0.0811186954, 0.0865297765, 0.0117180683, -0.0353855975, -0.030710239, 0.0352194682, 0.1344225556, -0.035456799, -0.0611831471, 0.0589048006, 0.0410577357, -0.0246821083, -0.048367437, -0.0344600193, 0.1219865754, 0.0797896609, 0.0167316217, -0.072100237, -0.0019520224, -0.0719103739, 0.0010672342, 0.0406780131, -0.044522725, 0.0048741228, -0.0914661959, -0.0374266207, 0.0676859319, 0.0763246715, -0.0517374948, 0.0789352804, 0.1196132898, 0.0325851291, 0.0169808157, 0.0567213818, -0.1054685488, -0.0805965737, 0.0471807979, 0.0828749239, -0.0695370957, -0.077796109, 0.1030003354, -0.0529716015, -0.0943141356, -0.0085556731, 0.0833495781, 0.0167078879, -0.1714457124, 0.0117358677, 0.0035302534, 0.0461128242, 0.0345312171, 0.0452584438, 0.064790532, -0.0827325284, 0.1126833186, -0.0018022092, 0.0359077193, 0.0205763336, -0.0918459222, 0.0053873449, 0.0007019716, -0.0602338351, 0.1364161074, 0.0610407516, 0.0108162221, 0.0528766699, 0.0193659626, 0.0332021825, -0.0328224562, 0.0193540957, 0.0195795577, 0.0089353975, -0.0355517268, -0.0816408172, 0.0392065793, -0.0278385691, -0.1134427637, 0.0384233966, 0.022842817, -0.038826853, 0.0843938217, -0.0274113789, 0.1088860705, -0.1338529736, -0.0855804607, -0.0358602554, -0.0327749923, 0.0420545153, 0.0182030555, 0.0396575034, 0.0472994633, -0.1044243053, -0.0642684102, -0.06422095, 0.1053736135, -0.025489023, 0.0698693544, 0.0965924785, 0.0888555869, 0.0322054029, 0.1044243053, 0.1075570285, 0.0257738158, 0.0567688495, 0.038542062, 0.0736191347, 0.0639836192, 0.0106441593, -0.0308526345, -0.0384708643, -0.0210747235, 0.1094556525, 0.0693472326, -0.1155312508, 0.0396812335, 0.0546803623, 0.0775587782, -0.0481063761, 0.0146787344, 0.0451160446, 0.0152008561, -0.0215968452, 0.1046141684, 0.0408916064, -0.049316749, -0.0341277607, -0.0167672206, -0.1478078514, -0.0118307993, -0.0931274891, -0.1065127924, -0.0380674042, 0.0816882849, 0.0256788861, -0.0769417286, -0.0218697712, -0.0866247043, 0.0445464589, 0.0574808307, 0.0251092985, 0.0218341723, 0.0683979169, -0.0056276391, 0.0416273251, 0.0108221555, 0.0728122219, 0.0086506046, -0.0298083927, -0.0696320236, 0.1152464598, 0.0883809328, 0.0148092648, 0.0401558913, -0.1096455157, 0.0500287339, 0.0290252101, -0.0401084237, 0.0363111794, -0.0270791203, 0.0524969436, 0.0733343437, -0.0417697206, -0.0453533716, 0.0834445134, -0.0095702503, 0.1035699248, -0.0376164801, 0.0013668607, 0.0046545947, -0.0798371285, 0.0057018041, -0.0334632434, 0.016446827, 0.0051351837, -0.0390167162, 0.0649803951, 0.0406780131, 0.0319918096, -0.0409628078, 0.0509780459, 0.0365722403, -0.0321579389, 0.0287404153, 0.0381386019, 0.0195083581, 0.0063307234, 0.0165298916, 0.000167891, 0.0893777087, -0.0720053017, 0.0288828127, 0.0116587365, -0.0053131799, -0.081878148, 0.0840140954, -0.0280521642, -0.0867196396, -0.145339638, -0.0036251845, 0.0713882521, -0.0369994305, -0.0627495125, -0.0539683774, -0.025963679, 0.0000811643, 0.0511679091, 0.0816882849, -0.0854855329, -0.0171113461, 0.0434072837, 0.0625596493, 0.0085378736, -0.0417697206, 0.090184629 ]
712.0099
Lorenzo Marrucci
L. Marrucci, C. Manzo, D. Paparo
Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
null
PRL 96, 163905 (2006)
10.1103/PhysRevLett.96.163905
null
physics.optics cond-mat.soft quant-ph
null
We demonstrate experimentally an optical process in which the spin angular momentum carried by a circularly polarized light beam is converted into orbital angular momentum, leading to the generation of helical modes with a wavefront helicity controlled by the input polarization. This phenomenon requires the interaction of light with matter that is both optically inhomogeneous and anisotropic. The underlying physics is also associated with the so-called Pancharatnam-Berry geometrical phases involved in any inhomogeneous transformation of the optical polarization.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 18:14:49 GMT" } ]
2007-12-04T00:00:00
[ [ "Marrucci", "L.", "" ], [ "Manzo", "C.", "" ], [ "Paparo", "D.", "" ] ]
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712.01
Philip Lucas
P. W. Lucas, M. G. Hoare, A. Longmore, A. C. Schroder, C. J. Davis, A. Adamson, R. M. Bandyopadhyay, R. de Grijs, M. Smith, A. Gosling, S. Mitchison, A. Gaspar, M. Coe, M. Tamura, Q. Parker, M. Irwin, N. Hambly, J. Bryant, R. S. Collins, N. Cross, D. W. Evans, E. Gonzalez-Solares, S. Hodgkin, J. Lewis, M. Read, M. Riello, E. T. W. Sutorius, A. Lawrence, J. E. Drew, S. Dye, M. A. Thompson
The UKIDSS Galactic Plane Survey
Accepted by MNRAS, 31 pages. Version 3 has significant edits
null
10.1111/j.1365-2966.2008.13924.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The UKIDSS Galactic Plane Survey (GPS) is one of the five near infrared Public Legacy Surveys that are being undertaken by the UKIDSS consortium, using the Wide Field Camera on the United Kingdom Infrared Telescope. It is surveying 1868 sq.deg. of the northern and equatorial Galactic plane at Galactic latitudes -5<b<5 in the J, H and K filters and a ~200 sq.deg. area of the Taurus-Auriga-Perseus molecular cloud complex in these three filters and the 2.12 um (1-0) H_2 filter. It will provide data on ~2 billion sources. Here we describe the properties of the dataset and provide a user's guide for its exploitation. We also present brief Demonstration Science results from DR2 and from the Science Verification programme. These results illustrate how GPS data will frequently be combined with data taken in other wavebands to produce scientific results. The Demonstration Science includes studies of: (i) the star formation region G28.983-0.603, cross matching with Spitzer-GLIMPSE data to identify YSOs; (ii) the M17 nebula; (iii) H_2 emission in the rho Ophiuchi dark cloud; (iv) X-ray sources in the Galactic Centre; (v) external galaxies in the Zone of Avoidance; (vi) IPHAS-GPS optical-infrared spectrophotometric typing. (abridged).
[ { "version": "v1", "created": "Sat, 1 Dec 2007 18:46:49 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 13:12:39 GMT" }, { "version": "v3", "created": "Fri, 26 Sep 2008 13:15:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Lucas", "P. W.", "" ], [ "Hoare", "M. G.", "" ], [ "Longmore", "A.", "" ], [ "Schroder", "A. C.", "" ], [ "Davis", "C. J.", "" ], [ "Adamson", "A.", "" ], [ "Bandyopadhyay", "R. M.", "" ], [ "de Grijs", "R.", "" ], [ "Smith", "M.", "" ], [ "Gosling", "A.", "" ], [ "Mitchison", "S.", "" ], [ "Gaspar", "A.", "" ], [ "Coe", "M.", "" ], [ "Tamura", "M.", "" ], [ "Parker", "Q.", "" ], [ "Irwin", "M.", "" ], [ "Hambly", "N.", "" ], [ "Bryant", "J.", "" ], [ "Collins", "R. S.", "" ], [ "Cross", "N.", "" ], [ "Evans", "D. W.", "" ], [ "Gonzalez-Solares", "E.", "" ], [ "Hodgkin", "S.", "" ], [ "Lewis", "J.", "" ], [ "Read", "M.", "" ], [ "Riello", "M.", "" ], [ "Sutorius", "E. T. W.", "" ], [ "Lawrence", "A.", "" ], [ "Drew", "J. E.", "" ], [ "Dye", "S.", "" ], [ "Thompson", "M. A.", "" ] ]
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712.0101
Lorenzo Marrucci
L. Marrucci, C. Manzo, D. Paparo
Pancharatnam-Berry phase optical elements for wavefront shaping in the visible domain: switchable helical modes generation
null
Appl. Phys. Lett. 88, 221102 (2006)
10.1063/1.2207993
null
physics.optics cond-mat.soft quant-ph
null
We report the realization of a Pancharatnam-Berry phase optical element [Z. Bomzon, G. Biener, V. Kleiner, and E. Hasman, Opt. Lett. \textbf{27}, 1141 (2002)] for wavefront shaping working in the visible spectral domain, based on patterned liquid crystal technology. This device generates helical modes of visible light with the possibility of electro-optically switching between opposite helicities by controlling the handedness of the input circular polarization. By cascading this approach, fast switching among multiple wavefront helicities can be achieved, with potential applications to multi-state optical information encoding. The approach demonstrated here can be generalized to other polarization-controlled devices for wavefront shaping, such as switchable lenses, beam-splitters, and holographic elements.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 18:57:50 GMT" } ]
2007-12-04T00:00:00
[ [ "Marrucci", "L.", "" ], [ "Manzo", "C.", "" ], [ "Paparo", "D.", "" ] ]
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712.0102
Jean-Paul Allouche
Jean-Paul Allouche, Christiane Frougny
Univoque numbers and an avatar of Thue-Morse
accepted by Acta Arithmetica
Acta Arithmetica, 136 (2009) 319-329
10.4064/aa136-4-2
null
math.NT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Univoque numbers are real numbers $\lambda > 1$ such that the number 1 admits a unique expansion in base $\lambda$, i.e., a unique expansion $1 = \sum_{j \geq 0} a_j \lambda^{-(j+1)}$, with $a_j \in \{0, 1, ..., \lceil \lambda \rceil -1\}$ for every $j \geq 0$. A variation of this definition was studied in 2002 by Komornik and Loreti, together with sequences called {\em admissible sequences}. We show how a 1983 study of the first author gives both a result of Komornik and Loreti on the smallest admissible sequence on the set $\{0, 1, >..., b\}$, and a result of de Vries and Komornik (2007) on the smallest univoque number belonging to the interval $(b, b+1)$, where $b$ is any positive integer. We also prove that this last number is transcendental. An avatar of the Thue-Morse sequence, namely the fixed point beginning in 3 of the morphism $3 \to 31$, $2 \to 30$, $1 \to 03$, $0 \to 02$, occurs in a "universal" manner.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 19:14:22 GMT" }, { "version": "v2", "created": "Sun, 5 Oct 2008 18:19:19 GMT" } ]
2015-05-13T00:00:00
[ [ "Allouche", "Jean-Paul", "" ], [ "Frougny", "Christiane", "" ] ]
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712.0103
Chung-Chin Lu
Ching-Yi Lai and Chung-Chin Lu
A Construction of Quantum Stabilizer Codes Based on Syndrome Assignment by Classical Parity-Check Matrices
34 pages, 3 figures, 5 tables, index terms add, abstract and conclusion slightly modified
IEEE Transactions on Information Theory, 57(10), 7163 - 7179, (2011),
10.1109/TIT.2011.2165812
null
quant-ph
null
In quantum coding theory, stabilizer codes are probably the most important class of quantum codes. They are regarded as the quantum analogue of the classical linear codes and the properties of stabilizer codes have been carefully studied in the literature. In this paper, a new but simple construction of stabilizer codes is proposed based on syndrome assignment by classical parity-check matrices. This method reduces the construction of quantum stabilizer codes to the construction of classical parity-check matrices that satisfy a specific commutative condition. The quantum stabilizer codes from this construction have a larger set of correctable error operators than expected. Its (asymptotic) coding efficiency is comparable to that of CSS codes. A class of quantum Reed-Muller codes is constructed, which have a larger set of correctable error operators than that of the quantum Reed-Muller codes developed previously in the literature. Quantum stabilizer codes inspired by classical quadratic residue codes are also constructed and some of which are optimal in terms of their coding parameters.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 01:51:11 GMT" } ]
2012-02-28T00:00:00
[ [ "Lai", "Ching-Yi", "" ], [ "Lu", "Chung-Chin", "" ] ]
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712.0104
Georg Hofmann
Georg W. Hofmann
Symmetric Systems and their Applications to Root Systems Extended by Abelian Groups
38 pages
null
null
null
math.GR
null
We investigate the class of root systems R obtained by extending an irreducible root system by a torsion-free group G. In this context there is a Weyl group W and a group U with the presentation by conjugation. We show under additional hypotheses that the kernel of the natural homomorphism from U to W is isomorphic to the kernel of the homomorphism from the abelianization of U to that of W. For this we introduce the concept of a symmetric system, a discrete version of the concept of a symmetric space. Mathematics Subject Classification 2000: 20F55, 17B65, 17B67, 22E65, 22E40. Key Words and Phrases: Weyl group, root system, presentation by conjugation, extended affine Weyl group (EAWeG), extended affine root system (EARS), irreducible root system extended by an abelian group.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:18:42 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 18:43:07 GMT" } ]
2007-12-05T00:00:00
[ [ "Hofmann", "Georg W.", "" ] ]
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712.0105
Gusztav Morvai
Gusztav Morvai and Benjamin Weiss
On estimating the memory for finitarily Markovian processes
null
Ann. Inst. H. Poincare Probab. Statist. 43 (2007), no. 1, 15--30
10.1016/j.anihpb.2005.11.001
null
math.PR cs.IT math.IT
null
Finitarily Markovian processes are those processes $\{X_n\}_{n=-\infty}^{\infty}$ for which there is a finite $K$ ($K = K(\{X_n\}_{n=-\infty}^0$) such that the conditional distribution of $X_1$ given the entire past is equal to the conditional distribution of $X_1$ given only $\{X_n\}_{n=1-K}^0$. The least such value of $K$ is called the memory length. We give a rather complete analysis of the problems of universally estimating the least such value of $K$, both in the backward sense that we have just described and in the forward sense, where one observes successive values of $\{X_n\}$ for $n \geq 0$ and asks for the least value $K$ such that the conditional distribution of $X_{n+1}$ given $\{X_i\}_{i=n-K+1}^n$ is the same as the conditional distribution of $X_{n+1}$ given $\{X_i\}_{i=-\infty}^n$. We allow for finite or countably infinite alphabet size.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 12:39:27 GMT" } ]
2015-05-13T00:00:00
[ [ "Morvai", "Gusztav", "" ], [ "Weiss", "Benjamin", "" ] ]
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712.0106
Micah Warren
Micah Warren, Yu Yuan
Hessian estimates for the sigma-2 equation in dimension three
15 pages. Submitted
null
null
null
math.AP math.DG
null
We derive a priori interior Hessian estimates for the special Lagrangian equation $\sigma_{2}=1$ in dimension three.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 20:09:40 GMT" } ]
2007-12-04T00:00:00
[ [ "Warren", "Micah", "" ], [ "Yuan", "Yu", "" ] ]
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712.0107
Misha Verbitsky
Liviu Ornea, Misha Verbitsky
Morse-Novikov cohomology of locally conformally K\"ahler manifolds
22 pages. Version 4.0, minor corrections, clarifications and typos. To appear in Journal of Geometry and Physics
J. Geom. Phys. 59 (2009), no. 3, 295--305.
10.1016/j.geomphys.2008.11.003
null
math.DG math.AG math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A locally conformally Kahler (LCK) manifold is a complex manifold admitting a Kahler covering, with the monodromy acting on this covering by homotheties. We define three cohomology invariants, the Lee class, the Morse-Novikov class, and the Bott-Chern class, of an LCK-structure. These invariants together play the same role as the Kahler class in Kahler geometry. If these classes for two LCK-structures coincide, the difference between these structures can be expressed by a smooth potential, similar to the Kahler case. We show that the Morse-Novikov class and the Bott-Chern class of a Vaisman manifold vanishes. Moreover, for any LCK-structure on a Vaisman manifold, we prove that its Morse-Novikov class vanishes. We show that a compact LCK-manifold $M$ with vanishing Bott-Chern class admits a holomorphic embedding to a Hopf manifold, if $\dim_\C M \geq 3$, a result which parallels the Kodaira embedding theorem.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 21:17:30 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 17:37:06 GMT" }, { "version": "v3", "created": "Wed, 26 Mar 2008 22:57:41 GMT" }, { "version": "v4", "created": "Thu, 13 Nov 2008 09:49:26 GMT" } ]
2015-05-13T00:00:00
[ [ "Ornea", "Liviu", "" ], [ "Verbitsky", "Misha", "" ] ]
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712.0108
M. Kilian
M.Kilian and M.U.Schmidt
On the moduli of constant mean curvature cylinders of finite type in the 3-sphere
Expanded and revised
null
null
null
math.DG
null
We show that one-sided Alexandrov embedded constant mean curvature cylinders of finite type in the 3-sphere are surfaces of revolution. This confirms a conjecture by Pinkall and Sterling that the only embedded constant mean curvature tori in the 3-sphere are rotational.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 19:23:10 GMT" }, { "version": "v2", "created": "Sat, 17 May 2008 12:59:31 GMT" } ]
2008-05-17T00:00:00
[ [ "Kilian", "M.", "" ], [ "Schmidt", "M. U.", "" ] ]
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712.0109
Grenville Croll
Raymond R. Panko
Recommended Practices for Spreadsheet Testing
12 Pages, Extensive References
Proc. European Spreadsheet Risks Int. Grp. 2006 73-84 ISBN:1-905617-08-9
null
null
cs.SE
null
This paper presents the authors recommended practices for spreadsheet testing. Documented spreadsheet error rates are unacceptable in corporations today. Although improvements are needed throughout the systems development life cycle, credible improvement programs must include comprehensive testing. Several forms of testing are possible, but logic inspection is recommended for module testing. Logic inspection appears to be feasible for spreadsheet developers to do, and logic inspection appears to be safe and effective.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 21:27:59 GMT" } ]
2008-03-12T00:00:00
[ [ "Panko", "Raymond R.", "" ] ]
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712.011
Asterios Pantokratoras
Asterios Pantokratoras
Comment on "Group method analysis of magneto-elastico-viscous flow along a semi-infinite flat plate with heat transfer", by Helal and Abd-el-Malek
6 pages, 1 figure
null
null
null
physics.flu-dyn
null
Comment on Group method analysis of magneto-elastico-viscous flow along a semi-infinite flat plate with heat transfer,Helal and Abd-el-Malek, Journal of Computational and Applied Mathematics 173 (2005) 199-210. In the above paper the authors treat the boundary layer flow of a elasto- viscous liquid along an infinite plate in the presence of a transverse magnetic field. The plate temperature is higher than the ambient fluid temperature. The boundary layer equations are transformed into ordinary ones using the group theory and subsequently are solved numerically. Velocity, temperature, shear stress and heat transfer profiles are presented for values of magnetic parameter M=0, 0.5 and 1. This is an interesting work but there are some fundamental errors which are presented below.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 21:29:13 GMT" } ]
2007-12-04T00:00:00
[ [ "Pantokratoras", "Asterios", "" ] ]
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712.0111
Eric Fusy
Olivier Bodini, Eric Fusy, and Carine Pivoteau
Random sampling of plane partitions
23 pages
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article presents uniform random generators of plane partitions according to the size (the number of cubes in the 3D interpretation). Combining a bijection of Pak with the method of Boltzmann sampling, we obtain random samplers that are slightly superlinear: the complexity is $O(n (\ln n)^3)$ in approximate-size sampling and $O(n^{4/3})$ in exact-size sampling (under a real-arithmetic computation model). To our knowledge, these are the first polynomial-time samplers for plane partitions according to the size (there exist polynomial-time samplers of another type, which draw plane partitions that fit inside a fixed bounding box). The same principles yield efficient samplers for $(a\times b)$-boxed plane partitions (plane partitions with two dimensions bounded), and for skew plane partitions. The random samplers allow us to perform simulations and observe limit shapes and frozen boundaries, which have been analysed recently by Cerf and Kenyon for plane partitions, and by Okounkov and Reshetikhin for skew plane partitions.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 22:31:06 GMT" }, { "version": "v2", "created": "Wed, 6 May 2009 19:22:56 GMT" }, { "version": "v3", "created": "Tue, 23 Jun 2009 12:43:25 GMT" } ]
2009-09-29T00:00:00
[ [ "Bodini", "Olivier", "" ], [ "Fusy", "Eric", "" ], [ "Pivoteau", "Carine", "" ] ]
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712.0112
Rowin Meijerink
R. Meijerink, A.E. Glassgold (UC Berkeley), J.R. Najita (NOAO)
Atomic Diagnostics of X-ray Irradiated Protoplanetary Disks
Accepted by ApJ
null
10.1086/527411
null
astro-ph
null
We study atomic line diagnostics of the inner regions of protoplanetary disks with our model of X-ray irradiated disk atmospheres which was previously used to predict observable levels of the NeII and NeIII fine-structure transitions at 12.81 and 15.55mum. We extend the X-ray ionization theory to sulfur and calculate the fraction of sulfur in S, S+, S2+ and sulfur molecules. For the D'Alessio generic T Tauri star disk, we find that the SI fine-structure line at 25.55mum is below the detection level of the Spitzer Infrared Spectrometer (IRS), in large part due to X-ray ionization of atomic S at the top of the atmosphere and to its incorporation into molecules close to the mid-plane. We predict that observable fluxes of the SII 6718/6732AA forbidden transitions are produced in the upper atmosphere at somewhat shallower depths and smaller radii than the neon fine-structure lines. This and other forbidden line transitions, such as the OI 6300/6363AA and the CI 9826/9852AA lines, serve as complementary diagnostics of X-ray irradiated disk atmospheres. We have also analyzed the potential role of the low-excitation fine-structure lines of CI, CII, and OI, which should be observable by SOFIA and Herschel.
[ { "version": "v1", "created": "Sat, 1 Dec 2007 23:07:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Meijerink", "R.", "", "UC Berkeley" ], [ "Glassgold", "A. E.", "", "UC Berkeley" ], [ "Najita", "J. R.", "", "NOAO" ] ]
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712.0113
Remco C.E. van den Bosch
R. C. E. van den Bosch (1), G. van de Ven (2, 3, 1), E. K. Verolme (1), M. Cappellari (4), P. T. de Zeeuw (5, 1) ((1) Sterrewacht Leiden, (2) Institute for Advanced Study, (3) Princeton University, (4) University of Oxford, (5) European Southern Observatory)
Triaxial orbit based galaxy models with an application to the (apparent) decoupled core galaxy NGC 4365
21 Pages, 14 (Colour) Figures, Companion paper is arXiv:0712.0309 Accepted to MNRAS. Full resolution version at http://www.strw.leidenuniv.nl/~bosch/papers/RvdBosch_triaxmethod.pdf
2008, MNRAS, 385..647
10.1111/j.1365-2966.2008.12874.x
null
astro-ph
null
We present a flexible and efficient method to construct triaxial dynamical models of galaxies with a central black hole, using Schwarzschild's orbital superposition approach. Our method is general and can deal with realistic luminosity distributions, which project to surface brightness distributions that may show position angle twists and ellipticity variations. The models are fit to measurements of the full line-of-sight velocity distribution (wherever available). We verify that our method is able to reproduce theoretical predictions of a three-integral triaxial Abel model. In a companion paper (van de Ven, de Zeeuw & van den Bosch), we demonstrate that the method recovers the phase-space distribution function. We apply our method to two-dimensional observations of the E3 galaxy NGC 4365, obtained with the integral-field spectrograph SAURON, and study its internal structure, showing that the observed kinematically decoupled core is not physically distinct from the main body and the inner region is close to oblate axisymmetric.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 19:12:40 GMT" } ]
2009-07-09T00:00:00
[ [ "Bosch", "R. C. E. van den", "" ], [ "van de Ven", "G.", "" ], [ "Verolme", "E. K.", "" ], [ "Cappellari", "M.", "" ], [ "de Zeeuw", "P. T.", "" ] ]
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712.0114
Sergei Treil
Hyun-Kyoung Kwon and Sergei Treil
Similarity of operators and geometry of eigenvector bundles
18 pages
Publ. Mat. 53 (2009), no. 2, 417--438
null
null
math.FA math.CV math.DG
null
We characterize the contractions that are similar to the backward shift in the Hardy space $H^2$. This characterization is given in terms of the geometry of the eigenvector bundles of the operators.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 02:01:59 GMT" } ]
2010-07-08T00:00:00
[ [ "Kwon", "Hyun-Kyoung", "" ], [ "Treil", "Sergei", "" ] ]
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712.0115
Carl H. Gibson
Carl H. Gibson (UCSD), R. Norris Keeler, Valery G. Bondur
Vertical stratified turbulent transport mechanism indicated by remote sensing
3 pages, 3 figures, SPIE News
null
null
null
astro-ph
null
Satellite and shipboard data reveal the intermittent vertical information transport mechanism of turbulence and internal waves that mixes the ocean, atmosphere, planets and stars.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 01:41:59 GMT" } ]
2007-12-04T00:00:00
[ [ "Gibson", "Carl H.", "", "UCSD" ], [ "Keeler", "R. Norris", "" ], [ "Bondur", "Valery G.", "" ] ]
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712.0116
Keqin Liu
Keqin Liu
Generalized Cohn's Theorem
15 pages
null
null
null
math.RA
null
We introduce the notion of a free associative $\mathcal{Z}_2$-algebra on the union of two disjoint sets and prove a generalization of Cohn's Theorem on Jordan algebras.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 02:16:59 GMT" } ]
2007-12-04T00:00:00
[ [ "Liu", "Keqin", "" ] ]
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712.0117
David Blaschke
D. B. Blaschke, T. Klahn, F. Sandin
Color superconducting quark matter in compact stars
8 pages, 3 figures, To appear in the proceedings of EXOCT 2007: International Symposium on Exotic States of Nuclear Matter, Catania, Italy, 11-15 Jun 2007
null
10.1142/9789812797049_0039
null
nucl-th
null
Recent indications for high neutron star masses (M \sim 2 M_sun) and large radii (R > 12 km) could rule out soft equations of state and have provoked a debate whether the occurence of quark matter in compact stars can be excluded as well. We show that modern quantum field theoretical approaches to quark matter including color superconductivity and a vector meanfield allow a microscopic description of hybrid stars which fulfill the new, strong constraints. For these objects color superconductivity turns out to be an essential ingredient for a successful description of the cooling phenomenology in accordance with recently developed tests. We discuss the energy release in the neutrino untrapping transition as a new aspect of the problem that hybrid stars masquerade themselves as neutron stars. Quark matter searches in future generations of low-temperature/high-density nucleus-nucleus collision experiments such as low-energy RHIC and CBM @ FAIR might face the same problem of an almost crossover behavior of the deconfinement transition. Therefore, diagnostic tools shall be derived from effects of color superconductivity.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 02:17:05 GMT" } ]
2017-08-23T00:00:00
[ [ "Blaschke", "D. B.", "" ], [ "Klahn", "T.", "" ], [ "Sandin", "F.", "" ] ]
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712.0118
Zhi-Gang Wang
Zhi-Gang Wang
Reanalysis of the (0^+,1^+) states B_{s0} and B_{s1} with QCD sum rules
9 pages, 5 figures, 4-version
Chin.Phys.Lett.25:3908-3911,2008
10.1088/0256-307X/25/11/020
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we calculate the masses and decay constants of the $P$-wave strange-bottomed mesons $B_{s0}$ and $B_{s1}$ with the QCD sum rules, and observe that the central values of the masses of the $B_{s0}$ and $B_{s1}$ are smaller than the corresponding $BK$ and $B^*K$ thresholds respectively, the strong decays $B_{s0}\to BK$ and $B_{s1}\to B^*K$ are kinematically forbidden. They can decay through the isospin violation precesses $B_{s0}\to B_s\eta\to B_s\pi^0$ and $B_{s1}\to B_s^*\eta\to B_s^*\pi^0$. The bottomed mesons $B_{s0}$ and $B_{s1}$, just like their charmed cousins $D_{s0}(2317)$ and $D_{s1}(2460)$, maybe very narrow.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 02:18:31 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 13:19:34 GMT" }, { "version": "v3", "created": "Wed, 7 May 2008 13:47:26 GMT" }, { "version": "v4", "created": "Thu, 28 Aug 2008 02:23:34 GMT" } ]
2008-12-18T00:00:00
[ [ "Wang", "Zhi-Gang", "" ] ]
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712.0119
Farhan Rana
Jahan M. Dawlaty, Shriram Shivaraman, Mvs Chandrashekhar, Farhan Rana, and Michael G. Spencer
Measurement of Ultrafast Carrier Dynamics in Epitaxial Graphene
null
MRS Proc. 1081 (2008) 1081-P06-04
10.1063/1.2837539
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
Using ultrafast optical pump-probe spectroscopy, we have measured carrier relaxation times in epitaxial graphene layers grown on SiC wafers. We find two distinct time scales associated with the relaxation of nonequilibrium photogenerated carriers. An initial fast relaxation transient in the 70-120 fs range is followed by a slower relaxation process in the 0.4-1.7 ps range. The slower relaxation time is found to be inversely proportional to the degree of crystalline disorder in the graphene layers as measured by Raman spectroscopy. We relate the measured fast and slow time constants to carrier-carrier and carrier-phonon intraband and interband scattering processes in graphene.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 07:18:02 GMT" } ]
2019-06-05T00:00:00
[ [ "Dawlaty", "Jahan M.", "" ], [ "Shivaraman", "Shriram", "" ], [ "Chandrashekhar", "Mvs", "" ], [ "Rana", "Farhan", "" ], [ "Spencer", "Michael G.", "" ] ]
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712.012
Jordan Bell
Leonhard Euler
On the partition of numbers into parts of a given type and number
14 pages
null
null
null
math.HO math.CO
null
E394 in the Enestrom index. Translated from the Latin original, "De partitione numerorum in partes tam numero quam specie datas" (1768). Euler finds a lot of recurrence formulas for the number of partitions of $N$ into $n$ parts from some set like 1 to 6 (numbers on the sides of a die). He starts the paper talking about how many ways a number $N$ can be formed by throwing $n$ dice. There do not seem to be any new results or ideas here that weren't in "Observationes analyticae variae de combinationibus", E158 and "De partitione numerorum", E191. In this paper Euler just does a lot of special cases. My impression is that Euler is trying to make his theory of partitions more approachable,. Also, maybe for his own benefit he wants to say it all again in different words, to make it clear.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 06:28:01 GMT" } ]
2007-12-04T00:00:00
[ [ "Euler", "Leonhard", "" ] ]
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712.0121
Thomas M. Breuel
Thomas M. Breuel
Efficient Binary and Run Length Morphology and its Application to Document Image Processing
null
null
null
null
cs.GR
null
This paper describes the implementation and evaluation of an open source library for mathematical morphology based on packed binary and run-length compressed images for document imaging applications. Abstractions and patterns useful in the implementation of the interval operations are described. A number of benchmarks and comparisons to bit-blit based implementations on standard document images are provided.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 07:25:59 GMT" } ]
2007-12-04T00:00:00
[ [ "Breuel", "Thomas M.", "" ] ]
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712.0122
Philippe G. LeFloch
Philippe G. LeFloch and Cristinel Mardare
Definition and stability of Lorentzian manifolds with distributional curvature
28 pages
Port.Math.64:535-574,2007
null
null
gr-qc math.DG
null
Following Geroch, Traschen, Mars and Senovilla, we consider Lorentzian manifolds with distributional curvature tensor. Such manifolds represent spacetimes of general relativity that possibly contain gravitational waves, shock waves, and other singular patterns. We aim here at providing a comprehensive and geometric (i.e., coordinate-free) framework. First, we determine the minimal assumptions required on the metric tensor in order to give a rigorous meaning to the spacetime curvature within the framework of distribution theory. This leads us to a direct derivation of the jump relations associated with singular parts of connection and curvature operators. Second, we investigate the induced geometry on a hypersurface with general signature, and we determine the minimal assumptions required to define, in the sense of distributions, the curvature tensors and the second fundamental form of the hypersurface and to establish the Gauss-Codazzi equations.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 07:36:50 GMT" } ]
2008-11-26T00:00:00
[ [ "LeFloch", "Philippe G.", "" ], [ "Mardare", "Cristinel", "" ] ]
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712.0123
Mahdou Najib
D. Bennis and N. Mahdou
Gorenstein Global Dimensions and Cotorsion Dimension of Rings
null
null
null
null
math.AC
null
In this paper, we establish, as a generalization of a result on the classical homological dimensions of commutative rings, an upper bound on the Gorenstein global dimension of commutative rings using the global cotorsion dimension of rings. We use this result to compute the Gorenstein global dimension of some particular cases of trivial extensions of rings and of group rings.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 08:18:12 GMT" }, { "version": "v2", "created": "Sat, 12 Apr 2008 23:32:08 GMT" } ]
2008-04-13T00:00:00
[ [ "Bennis", "D.", "" ], [ "Mahdou", "N.", "" ] ]
[ 0.0845940188, 0.0655603632, 0.1173238456, 0.0631937459, 0.033585839, 0.009032174, 0.0067725568, -0.0596689954, -0.0703439564, -0.045343399, -0.0433040783, -0.0328808874, -0.1260853708, -0.0511340611, 0.0797600746, 0.014955014, -0.0129912244, -0.0768395662, 0.127092436, 0.1840927005, 0.0805153772, -0.0079684546, 0.0752282515, -0.0436817333, -0.016729977, 0.0232381783, 0.0281224754, 0.0975348875, 0.1907393634, 0.0033359248, 0.067222029, -0.0159998499, -0.0763863847, -0.1327320337, -0.0822777525, 0.0529216155, 0.0018268909, 0.1768417805, 0.0651575327, 0.0856010914, -0.0986930206, 0.0356503353, -0.0548350513, 0.0181021132, 0.0061871964, -0.031722758, 0.0100140683, -0.0658624843, 0.0197386034, 0.0211988576, -0.079004772, 0.058007326, 0.0840401277, 0.0324025303, -0.1376666874, 0.0642008185, -0.054331515, 0.0255544428, -0.0168055072, -0.0377903618, -0.0767388567, -0.1099722236, 0.0267881062, -0.0031297898, -0.0116442656, 0.0126324547, -0.1079580784, 0.0226591118, 0.0599711165, 0.0354237445, -0.1094686836, 0.0334096029, 0.0583598018, 0.0493968651, 0.0927512944, 0.0244718399, 0.0744225904, 0.0851982608, 0.0192980096, 0.0291799009, 0.0378658921, 0.0007364211, -0.0071627968, 0.0349705629, 0.0361790471, 0.0364559926, 0.0529719666, -0.0161257349, -0.1016638801, -0.0142878285, -0.012966047, -0.0041762004, 0.0187315326, 0.0807671472, 0.0193105992, -0.0313702822, 0.0411137007, 0.1448169053, 0.0134695834, 0.0235654768, -0.0034240435, 0.0030117736, 0.0709985495, -0.0230871178, 0.0964271054, 0.0843422487, -0.0343159661, -0.0772927478, -0.1279987991, 0.0245473702, -0.0568491928, -0.0186434127, -0.0784508809, 0.0211233273, 0.0950675607, -0.0654596537, -0.0341649055, -0.0553385876, -0.0583598018, 0.0081069265, 0.0014083268, -0.1081594899, 0.0109833749, 0.0626902059, 0.0912406892, 0.0000520747, -0.0816735104, -0.0127205737, -0.005249361, -0.0574534349, 0.0220422801, -0.0284245964, 0.0377400108, -0.0595179349, -0.1285023391, 0.0072509157, -0.0157606713, 0.0489436798, 0.0768395662, 0.0084342249, 0.014741011, -0.0384953134, 0.0150808981, 0.0132052265, 0.002605798, 0.0507564098, -0.1155111194, 0.07477507, -0.0188322403, 0.0662653148, -0.1085623205, -0.0608271249, 0.1294087023, -0.0765877962, -0.0330571271, -0.0695886463, -0.0253530275, 0.0467533022, -0.0153200775, -0.0059259869, 0.0710489005, 0.0579066202, -0.0194994248, 0.0516124219, 0.0614817217, 0.0221681651, -0.0737176463, 0.0060487241, -0.0483142622, -0.0366070531, 0.0890251324, -0.0336865447, -0.1696915627, -0.0422466546, 0.0042234068, -0.0073390347, -0.119942233, -0.0645532906, 0.0576044954, 0.035826575, 0.0066403784, -0.0071879737, 0.03726165, -0.0178251676, -0.0837883577, 0.0321507603, 0.0400310978, -0.0670206174, 0.0556910597, -0.0021589098, -0.1176259667, 0.0028135064, 0.1162160635, 0.1267903149, -0.0131674614, -0.0930534154, -0.037563771, 0.0137339393, 0.0254789125, 0.0065459656, 0.058561217, -0.0072949752, 0.0426998362, -0.0665674359, -0.0609781854, -0.0382435434, 0.0559931844, 0.0217779242, -0.0333340727, 0.0721566826, 0.0218031015, -0.0352978595, -0.0029079192, 0.097635597, 0.0590647496, 0.0412647612, -0.0085349325, -0.0524180792, -0.0241067763, 0.0378910713, -0.0191973038, 0.0491702706, 0.0177999903, 0.005101447, 0.0687829927, -0.0199148413, -0.0184042342, 0.0090258792, 0.086658515, 0.0349957384, 0.0594172254, -0.0037041353, -0.0796593651, -0.0532237366, -0.0240941886, -0.0464511774, 0.0548350513, -0.0599711165, -0.0187692977, -0.1328327507, -0.0450161025, 0.0193987172, -0.007867747, 0.0792061836, -0.086658515, 0.0547343418, 0.0308163911, 0.0034932797, -0.0288526025, -0.0111218477, -0.1361560822, 0.0947654396, 0.0082202218, 0.0026136655, -0.0513354763, -0.0438327938 ]
712.0124
Clement Mouhot
St\'ephane Mischler (CEREMADE), Cl\'ement Mouhot (CEREMADE)
Stability, convergence to the steady state and elastic limit for the Boltzmann equation for diffusively excited granular media
null
Discrete and Continuous Dynamical Systems: Series A 24, 1 (2009) 159-185
10.3934/dcds.2009.24.159
null
math.AP
null
We consider a space-homogeneous gas of {\it inelastic hard spheres}, with a {\it diffusive term} representing a random background forcing (in the framework of so-called {\em constant normal restitution coefficients} $\alpha \in [0,1]$ for the inelasticity). In the physical regime of a small inelasticity (that is $\alpha \in [\alpha_*,1)$ for some constructive $\alpha_* \in [0,1)$) we prove uniqueness of the stationary solution for given values of the restitution coefficient $\alpha \in [\alpha_*,1)$, the mass and the momentum, and we give various results on the linear stability and nonlinear stability of this stationary solution.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 08:23:29 GMT" } ]
2010-02-02T00:00:00
[ [ "Mischler", "Stéphane", "", "CEREMADE" ], [ "Mouhot", "Clément", "", "CEREMADE" ] ]
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712.0125
Gerard Henry Edmond Duchamp
G\'erard H. E. Duchamp (LIPN), Christophe Tollu (LIPN)
Sweedler's duals and Sch\"utzenberger's calculus
null
null
null
null
math.CO cs.DM math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe the problem of Sweedler's duals for bialgebras as essentially characterizing the domain of the transpose of the multiplication. This domain is the set of what could be called ``representative linear forms'' which are the elements of the algebraic dual which are also representative on the multiplicative semigroup of the algebra. When the algebra is free, this notion is indeed equivalent to that of rational functions of automata theory. For the sake of applications, the range of coefficients has been considerably broadened, i.e. extended to semirings, so that the results could be specialized to the boolean and multiplicity cases. This requires some caution (use of ``positive formulas'', iteration replacing inversion, stable submodules replacing finite-rank families for instance). For the theory and its applications has been created a rational calculus which can, in return, be applied to harness Sweedler's duals. A new theorem of rational closure and application to Hopf algebras of use in Physics and Combinatorics is provided. The concrete use of this ``calculus'' is eventually illustrated on an example.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 08:27:07 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 14:03:41 GMT" }, { "version": "v3", "created": "Mon, 17 Aug 2009 13:30:58 GMT" } ]
2009-08-17T00:00:00
[ [ "Duchamp", "Gérard H. E.", "", "LIPN" ], [ "Tollu", "Christophe", "", "LIPN" ] ]
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712.0126
Mahdou Najib
D. Bennis and N. Mahdou
Global Gorenstein dimensions of polynomial rings and of direct product of rings
null
null
null
null
math.AC
null
In this paper, we extend the well-known Hilbert's syzygy theorem to the Gorenstein homological dimensions of rings. Also, we study the Gorenstein homological dimensions of direct product of rings, which gives examples of non-Noetherian rings of finite Gorenstein dimensions and infinite classical weak dimension.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 09:06:44 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 08:18:08 GMT" } ]
2008-01-08T00:00:00
[ [ "Bennis", "D.", "" ], [ "Mahdou", "N.", "" ] ]
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712.0127
Mahdou Najib
D. Bennis, N. Mahdou, and K. Ouarghi
Rings over which all modules are strongly Gorenstein projective
null
null
null
null
math.AC
null
One of the main results of this paper is the characterization of the rings over which all modules are strongly Gorenstein projective. We show that these kinds of rings are very particular cases of the well-known quasi-Frobenius rings. We give examples of rings over which all modules are Gorenstein projective but not necessarily strongly Gorenstein projective.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 09:12:56 GMT" }, { "version": "v2", "created": "Sat, 12 Apr 2008 23:25:23 GMT" } ]
2008-04-13T00:00:00
[ [ "Bennis", "D.", "" ], [ "Mahdou", "N.", "" ], [ "Ouarghi", "K.", "" ] ]
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712.0128
Mahdou Najib
C. Bakkari, N. Mahdou and H. Mouanis
Pr\"ufer-Like Conditions in Subring Retracts and Applications
null
null
null
null
math.AC
null
In this paper, we consider five possible extensions of the Pr\"ufer domain notion to the case of commutative rings with zero divisors. We investigate the transfer of these Pr\"ufer-like properties between a commutative ring and its subring retract. Our results generate new families of examples of rings subject to a given Pr\"ufer-like conditions.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 09:22:48 GMT" } ]
2007-12-04T00:00:00
[ [ "Bakkari", "C.", "" ], [ "Mahdou", "N.", "" ], [ "Mouanis", "H.", "" ] ]
[ 0.024837764, 0.0939377025, 0.0136660775, 0.0158685725, 0.0597061664, 0.0331435539, 0.0236038379, 0.0871444643, -0.0380792655, 0.0772199705, 0.0507900454, -0.1029068902, -0.0496489927, 0.0284732059, 0.14202106, 0.019809179, 0.1228089482, 0.0240814872, 0.0477118604, 0.2562323213, 0.0824741125, -0.0409451611, 0.0211757869, -0.0402552225, -0.0012571465, -0.0723904073, 0.0485610142, 0.0409186259, 0.0870383233, -0.0992979854, -0.0173943955, -0.0649603084, 0.0124719543, 0.027915949, -0.0702675208, 0.097175099, -0.0474199615, -0.0033767154, 0.0202868283, 0.0977058187, -0.0020548871, -0.024705084, -0.1032783985, -0.0075959507, -0.0073504923, 0.1009962931, 0.0191590451, -0.0331966281, 0.045907408, 0.0357440896, -0.0837478489, 0.0016651386, 0.1006778628, -0.0185089111, -0.072071977, -0.0363013484, -0.0558849685, 0.0178587772, 0.0524618179, -0.0562564768, 0.0120540112, -0.0923986062, 0.0431211181, 0.0028509693, -0.1335295141, 0.0233782809, -0.0329578035, 0.0818903223, 0.0206981376, 0.0665524751, -0.0266024135, -0.1222782284, 0.1143174022, 0.0415820256, 0.0058644721, 0.0577424951, 0.146054551, 0.1141051129, 0.0161870047, 0.0524618179, 0.0092146518, -0.0312594958, 0.109647058, 0.0701613799, 0.0449786447, 0.0492244177, -0.0388488099, 0.0266156811, 0.0118947951, -0.0234048162, 0.0617759787, 0.0029836497, -0.0650133789, 0.008299157, 0.0337008126, -0.0178587772, -0.0279955566, 0.0265493412, -0.0417412445, 0.0946807116, -0.0492774881, -0.0503389314, 0.0653848872, -0.0311533492, 0.0884181932, 0.1199430525, 0.013878366, 0.0082925232, -0.1303451955, -0.0878344029, -0.0333823785, 0.0162268095, 0.0337008126, 0.0983426869, -0.0301184431, -0.0234446209, -0.0760523826, 0.0073438585, -0.0575302057, 0.003632125, -0.0090488009, 0.0345234312, 0.0729211271, -0.054823529, 0.0881528333, 0.0147938607, 0.0439172015, -0.1232335269, -0.0388222747, -0.1031722501, 0.0494367033, 0.0044348412, 0.0081399409, -0.0055957944, -0.072071977, -0.0056289644, 0.0723904073, -0.0472342111, 0.0311798863, -0.103225328, 0.0798205063, -0.0497286022, -0.0054664309, -0.0055526732, -0.0502858572, 0.0238028578, -0.0770076811, 0.0196234267, 0.0453766845, 0.0601838157, -0.0696306527, -0.1012085825, 0.0344438218, 0.0388753489, -0.0887897015, -0.0593346581, -0.0289773922, -0.0356114097, -0.0348153263, -0.0052640936, 0.0344172865, 0.1073118821, -0.040653266, 0.030383803, 0.0681446344, -0.0230598468, 0.0085048117, -0.0074301003, -0.0222372301, -0.0658625364, 0.0495163128, -0.1082671806, -0.1665403992, -0.0366463177, -0.0861891657, 0.0419004597, -0.0524087436, -0.0758401006, 0.0570525564, 0.0109328618, 0.1153788492, 0.0622005574, 0.0874628946, 0.0514799803, 0.0782814175, -0.0344172865, -0.0130491136, -0.0818372518, -0.0184823759, 0.0021013252, -0.0508696511, -0.0212421268, 0.005837936, 0.0933539048, 0.0333558433, -0.085658446, 0.0386365242, 0.05731792, -0.0436783768, -0.1004125029, -0.0310737416, -0.0325066894, 0.0368320681, 0.1007309332, 0.0293754339, -0.0109328618, 0.0994572043, -0.0559911132, -0.0291896798, -0.0383446254, -0.0153511185, 0.0157624278, -0.0028426768, 0.0406798013, 0.0424311794, -0.0858176574, 0.1006778628, 0.0650133789, -0.0053072148, 0.0628904924, 0.0213748068, 0.0022671758, 0.1136805415, 0.0613513999, 0.0520107038, 0.0873567536, 0.0342580713, 0.0087967087, 0.0762116015, -0.0554073192, 0.0150061492, 0.0017198692, -0.0764769614, -0.0859768763, 0.059493877, -0.0223566424, -0.0175005402, -0.0281813089, -0.0075627808, -0.1072057337, -0.0697368011, 0.0947337821, 0.0492774881, 0.044421386, 0.0418473892, 0.0426434688, -0.0018525496, 0.051718805, 0.0399898626, -0.1141051129, -0.0680915639, 0.0300919078, 0.0088099763, 0.0211359821, -0.0723373368, -0.0581139997 ]
712.0129
Chiapin Sun
C. P. Sun, Jianjun Liu, J. -Y. Lin, Chun-gang Duan, W. N. Mei, and H. D. Yang
A Low-Temperature Specific Heat Study of the Giant Dielectric Constant Materials
null
null
10.1088/0953-8984/20/28/285214
null
cond-mat.mtrl-sci cond-mat.str-el
null
Low-temperature specific-heat study has been performed on the insulating giant dielectric constant material CaCu3Ti4O12 and two related compounds, Bi2/3Cu3Ti4O12 and La0.5Na0.5Cu3Ti4O12, from 0.6 to 10 K. From analyzing the specific heat data at very low-temperature range, 0.6 to 1.5 K, and moderately low-temperature range, 1.5 to 5 K, in addition to the expected Debye terms, we noticed significant contributions originated from the linear and Einstein terms, which we attributed as the manifestation of low-lying elementary excitations due to lattice vibrations occurred at the grain boundaries and induced by local defects. Together with the findings on electronic and mechanical properties, a phenomenological model is proposed to explain the high dielectric constant behaviors at both low and high frequency regions.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 09:34:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Sun", "C. P.", "" ], [ "Liu", "Jianjun", "" ], [ "Lin", "J. -Y.", "" ], [ "Duan", "Chun-gang", "" ], [ "Mei", "W. N.", "" ], [ "Yang", "H. D.", "" ] ]
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712.013
Thomas M. Breuel
Thomas M. Breuel
On the Relationship between the Posterior and Optimal Similarity
null
null
null
null
cs.LG
null
For a classification problem described by the joint density $P(\omega,x)$, models of $P(\omega\eq\omega'|x,x')$ (the ``Bayesian similarity measure'') have been shown to be an optimal similarity measure for nearest neighbor classification. This paper analyzes demonstrates several additional properties of that conditional distribution. The paper first shows that we can reconstruct, up to class labels, the class posterior distribution $P(\omega|x)$ given $P(\omega\eq\omega'|x,x')$, gives a procedure for recovering the class labels, and gives an asymptotically Bayes-optimal classification procedure. It also shows, given such an optimal similarity measure, how to construct a classifier that outperforms the nearest neighbor classifier and achieves Bayes-optimal classification rates. The paper then analyzes Bayesian similarity in a framework where a classifier faces a number of related classification tasks (multitask learning) and illustrates that reconstruction of the class posterior distribution is not possible in general. Finally, the paper identifies a distinct class of classification problems using $P(\omega\eq\omega'|x,x')$ and shows that using $P(\omega\eq\omega'|x,x')$ to solve those problems is the Bayes optimal solution.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 09:38:26 GMT" } ]
2007-12-04T00:00:00
[ [ "Breuel", "Thomas M.", "" ] ]
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712.0131
Thomas M. Breuel
Thomas M. Breuel
Learning Similarity for Character Recognition and 3D Object Recognition
null
null
null
null
cs.CV
null
I describe an approach to similarity motivated by Bayesian methods. This yields a similarity function that is learnable using a standard Bayesian methods. The relationship of the approach to variable kernel and variable metric methods is discussed. The approach is related to variable kernel Experimental results on character recognition and 3D object recognition are presented..
[ { "version": "v1", "created": "Sun, 2 Dec 2007 10:02:01 GMT" } ]
2007-12-04T00:00:00
[ [ "Breuel", "Thomas M.", "" ] ]
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712.0132
Pedro J. Silva
Pedro J. Silva
On Uniqueness of supersymmetric Black holes in AdS(5)
16 pages, typos corrected and references added
Class.Quant.Grav.25:195016,2008
10.1088/0264-9381/25/19/195016
null
hep-th gr-qc
null
We study the possibility of having Black hole of spherical and ring horizon topology with five independent charges in the $U(1)^3$-model of 5D gauge supergravity. To study these possibilities we consider not only the known result obtained by local supersymmetry analysis but include the input coming from non-local properties of the solutions, like the attractor mechanism, the entropy function of Sen, the Euclidean formulation and general properties of the uplift to ten dimension. For the spherical case, we found that there is no room for more general Black holes than the ones already describe in hep-th/0601156. On the other hand, if a solution of ring horizon topology exists, we conclude that it must be labeled by three independent parameters only, since it has to satisfy two independent constraints that we explicitly find in terms of its chemical potentials. At the end of the article, based on all the local and non-local information, we put forward a conjecture on the constraints that characterize general Black holes dual to ${\cal N}=4$ SYM.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 10:04:28 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 16:15:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Silva", "Pedro J.", "" ] ]
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712.0133
Allon Klein
Allon M. Klein, David P. Doupe, Philip H. Jones and Benjamin D. Simons
Mechanism of murine epidermal maintenance: Cell division and the Voter Model
null
null
10.1103/PhysRevE.77.031907
null
physics.bio-ph cond-mat.stat-mech q-bio.CB
null
This paper presents an interesting experimental example of voter-model statistics in biology. In recent work on mouse tail-skin, where proliferating cells are confined to a two-dimensional layer, we showed that cells proliferate and differentiate according to a simple stochastic model of cell division involving just one type of proliferating cell that may divide both symmetrically and asymmetrically. Curiously, these simple rules provide excellent predictions of the cell population dynamics without having to address their spatial distribution. Yet, if the spatial behaviour of cells is addressed by allowing cells to diffuse at random, one deduces that density fluctuations destroy tissue confluence, implying some hidden degree of spatial regulation in the physical system. To infer the mechanism of spatial regulation, we consider a two-dimensional model of cell fate that preserves the overall population dynamics. By identifying the resulting behaviour with a three-species variation of the "Voter" model, we predict that proliferating cells in the basal layer should cluster. Analysis of empirical correlations of cells stained for proliferation activity confirms that the expected clustering behaviour is indeed seen in nature.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 10:16:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Klein", "Allon M.", "" ], [ "Doupe", "David P.", "" ], [ "Jones", "Philip H.", "" ], [ "Simons", "Benjamin D.", "" ] ]
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712.0134
Asle Sudbo
Jacob Linder, Takehito Yokoyama, and Asle Sudb\o
Identifying the odd-frequency superconducting state by a field-induced Josephson effect
10 pages, 7 figures. To appear in Physical Review B
Phys. Rev. B 77, 174507 (2008)
10.1103/PhysRevB.77.174507
null
cond-mat.supr-con cond-mat.mtrl-sci
null
Superconducting order parameters that are odd under exchange of time-coordinates of the electrons constituting a Cooper-pair, are potentially of great importance both conceptually and technologically. Recent experiments report that such an odd-frequency superconducting {\it bulk} state may be realized in certain heavy-fermion compounds. While the Josephson current normally only flows between superconductors with the same symmetries with respect to frequency, we demonstrate that an exchange field may induce a current between diffusive even- and odd-frequency superconductors. This suggests a way to identify the possible existence of bulk odd-frequency superconductors.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 10:28:24 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 10:46:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Linder", "Jacob", "" ], [ "Yokoyama", "Takehito", "" ], [ "Sudbø", "Asle", "" ] ]
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712.0135
Ziyu Liu
Ziyu Liu, Xiguo Lee
Decomposition of noncommutative U(1) gauge potential
9 pages
Commun.Theor.Phys.50:943-946,2008
10.1088/0253-6102/50/4/30
null
hep-th
null
We investigate the decomposition of noncommutative gauge potential $\hat{A_{i}}$, and find it has inner structure, namely, $\hat{A_{i}}$ can be decomposed in two parts $\hat{b_{i}}$ and $\hat{a_{i}}$, here $\hat{b_{i}}$ satisfies gauge transformations while $\hat{a_{i}}$ satisfies adjoint transformations, so dose the Seiberg-Witten mapping of noncommutative U(1) gauge potential. By means of Seiberg-Witten mapping, we construct a mapping of unit vector field between noncommutative space and ordinary space, and find the noncommutative U(1) gauge potential and its gauge field tenser can be expressed in terms of the unit vector field. When the unit vector field has non singularity point, noncommutative gauge potential and gauge field tenser will equal to ordinary gauge potential and gauge field tenser.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 10:43:27 GMT" } ]
2008-12-18T00:00:00
[ [ "Liu", "Ziyu", "" ], [ "Lee", "Xiguo", "" ] ]
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712.0136
Thomas M. Breuel
Thomas M. Breuel
Learning View Generalization Functions
null
null
null
null
cs.CV
null
Learning object models from views in 3D visual object recognition is usually formulated either as a function approximation problem of a function describing the view-manifold of an object, or as that of learning a class-conditional density. This paper describes an alternative framework for learning in visual object recognition, that of learning the view-generalization function. Using the view-generalization function, an observer can perform Bayes-optimal 3D object recognition given one or more 2D training views directly, without the need for a separate model acquisition step. The paper shows that view generalization functions can be computationally practical by restating two widely-used methods, the eigenspace and linear combination of views approaches, in a view generalization framework. The paper relates the approach to recent methods for object recognition based on non-uniform blurring. The paper presents results both on simulated 3D ``paperclip'' objects and real-world images from the COIL-100 database showing that useful view-generalization functions can be realistically be learned from a comparatively small number of training examples.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 10:54:40 GMT" } ]
2007-12-04T00:00:00
[ [ "Breuel", "Thomas M.", "" ] ]
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712.0137
Thomas M. Breuel
Thomas M. Breuel
View Based Methods can achieve Bayes-Optimal 3D Recognition
null
null
null
null
cs.CV
null
This paper proves that visual object recognition systems using only 2D Euclidean similarity measurements to compare object views against previously seen views can achieve the same recognition performance as observers having access to all coordinate information and able of using arbitrary 3D models internally. Furthermore, it demonstrates that such systems do not require more training views than Bayes-optimal 3D model-based systems. For building computer vision systems, these results imply that using view-based or appearance-based techniques with carefully constructed combination of evidence mechanisms may not be at a disadvantage relative to 3D model-based systems. For computational approaches to human vision, they show that it is impossible to distinguish view-based and 3D model-based techniques for 3D object recognition solely by comparing the performance achievable by human and 3D model-based systems.}
[ { "version": "v1", "created": "Sun, 2 Dec 2007 11:02:37 GMT" } ]
2007-12-04T00:00:00
[ [ "Breuel", "Thomas M.", "" ] ]
[ -0.0042652776, 0.0087193735, 0.0510349721, 0.0164137315, -0.0159281977, -0.0950566828, 0.0821091235, 0.0401104689, -0.1191175655, 0.0593969412, 0.0593969412, -0.0804906785, 0.131957233, 0.0208374821, 0.0067064324, 0.0212825555, 0.1022317931, -0.033070229, 0.0462605581, 0.0820551738, -0.0812459514, 0.012927331, 0.0637667403, 0.0080517652, 0.0078966636, 0.0426999815, 0.0637127906, -0.0144041628, 0.0291859619, -0.0030716741, 0.013385891, -0.044857908, -0.107302919, -0.0863170773, -0.0541909412, 0.0352821052, -0.1207360104, 0.0455052853, -0.0519520901, 0.0844288915, 0.0883131623, 0.0718589649, 0.0326656178, 0.0253151804, -0.0323149562, -0.0508461557, 0.0531389527, -0.0059781321, -0.1350862235, 0.0810841024, -0.0940316692, 0.0649536029, -0.0555666201, -0.1321730316, -0.0598285235, -0.1591471136, -0.0237776581, -0.0566995293, -0.0164407063, 0.0126643339, 0.0121585699, -0.0880434215, 0.0011303829, 0.0939777195, -0.0473395213, -0.0370354205, -0.0617167093, 0.0141344219, -0.0139186289, -0.0192325246, -0.0265020411, -0.0480678231, 0.0964593366, 0.0609074868, 0.0404071808, -0.0411085077, 0.0428078771, 0.1455521733, -0.0438059159, 0.0148762092, 0.0409196913, -0.0175871048, 0.0807064697, -0.0103513058, -0.0833499283, -0.0332050994, 0.0388966352, -0.0563218929, -0.0885289535, -0.0217815749, -0.0386538655, -0.0119899819, 0.0490119159, -0.0497671887, 0.0683523342, 0.1081121415, -0.0548113436, -0.1104319096, 0.0509810261, -0.0091509586, -0.1315256506, 0.0031694553, 0.0329893082, 0.0121585699, 0.1235413179, 0.0096567236, 0.0417828597, 0.0650614947, 0.0435631499, 0.1398336738, -0.0226312596, 0.0138511937, 0.0350123644, 0.0396249332, 0.071589224, -0.0899855569, 0.0074381046, -0.0290510915, 0.0212555807, -0.0071076718, 0.0350123644, 0.0347965732, 0.0468809642, -0.0197450314, 0.0748261139, -0.1227860451, 0.0370893702, -0.1138306484, 0.0346077532, -0.0117269848, 0.0304267704, 0.0646299124, 0.0560521521, -0.0015459524, -0.0939777195, -0.0133521734, -0.0152133852, -0.045586206, -0.0507922061, 0.0292129368, 0.0243980624, -0.0338524804, -0.0359834321, 0.0288083255, -0.040811792, 0.0859933868, -0.0288622733, -0.012252979, 0.0426460318, 0.0188953485, -0.0966211781, -0.0488500707, 0.0251398496, -0.0633891076, -0.130338788, -0.1148017123, 0.0959738046, 0.0324498266, 0.0319912657, -0.0974843502, -0.0161170177, -0.0270954706, 0.0353360549, 0.1028791666, -0.0818933249, 0.0287813507, -0.0763906166, 0.0156854317, -0.0706181601, -0.0659246668, 0.0466921441, 0.0771998391, 0.0217680875, -0.0815696418, 0.0826486051, 0.0586416647, 0.065169394, -0.0774695799, 0.0452355444, -0.0219569076, -0.0446151383, 0.0177354626, 0.0414321981, 0.0048654508, 0.0252342578, 0.0400295444, -0.0923592746, -0.0159012247, 0.0288083255, 0.0543527864, -0.0821630657, 0.0747721717, -0.0042956234, 0.0408387668, -0.0241148341, -0.0293478072, -0.0182075091, 0.0325577222, -0.0291589871, -0.095758006, 0.0507652313, 0.0169397257, 0.0558903068, -0.0623640902, -0.0289162211, -0.0565376878, 0.1403731555, 0.0083552236, -0.1451205909, 0.0456131808, -0.0436170995, -0.0145794936, 0.0451815948, 0.0510889217, -0.1207360104, -0.0419716798, -0.0664101988, 0.1081660911, 0.0207565594, 0.0553508252, -0.0480408482, 0.027230341, 0.1752236634, 0.0096162623, -0.0721287057, -0.0512237921, 0.0919276848, -0.0480138734, 0.0589114055, -0.1171754301, 0.0243171398, -0.0767142996, -0.024384575, 0.0782248527, 0.0417289138, 0.0030210977, 0.0196506232, -0.0468000397, -0.0448848791, -0.0363340937, 0.0781169534, 0.065816775, 0.0175196696, -0.0230628438, -0.057185065, 0.0432664342, -0.0921434835, -0.0590732507, -0.0294287298, -0.0108975312, 0.0633351579, 0.0443453975, -0.0253151804, -0.1006672904, -0.0177084878, 0.08426705 ]
712.0138
Taekyun Kim
T. Kim
Symmetry p-adic invariant integral on Z_p for Bernoulli and euler polynomials
11 pages
null
null
null
math.NT
null
The main purpose of this paper is to investigate several further interesting properties of symmetry for the p-adic invariant integral on Z_p.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 12:02:15 GMT" } ]
2007-12-04T00:00:00
[ [ "Kim", "T.", "" ] ]
[ 0.0843448192, -0.0337198935, 0.0317363702, 0.0663578659, 0.0413835086, 0.0028132782, -0.021999076, -0.0215031952, -0.0380926616, 0.0063450201, 0.0242981594, -0.0503544435, -0.0149665847, 0.0091287149, 0.0351624563, 0.049497921, 0.0304290503, 0.0751484856, 0.0719477981, 0.0751484856, 0.0127125811, -0.0410003252, 0.0472889952, -0.0188209303, 0.1069299355, -0.0732100382, -0.0449222922, 0.0130056012, 0.1714846045, -0.102151446, 0.1233390793, -0.0233289376, -0.0295274481, -0.0036796611, -0.0679356679, 0.129109323, -0.0630670264, -0.0210523941, -0.0432768688, 0.0338100567, -0.1296502948, 0.0653210282, -0.1424530298, 0.0467931181, 0.0004180472, 0.0535551272, 0.069333151, -0.0211989041, -0.0642841831, -0.0064126407, 0.0485963188, 0.0913773105, 0.0861480236, -0.0327281319, -0.0490921997, 0.0185729899, -0.0499938019, 0.0607228577, 0.0004367132, -0.0168712176, 0.0464775562, -0.0147975339, -0.0063337502, -0.0581983738, -0.1330763698, -0.1121592224, -0.1250521243, 0.0203874633, 0.0109826326, 0.0289639477, 0.0115855793, 0.0290541071, 0.0830374956, 0.0671693087, -0.0313081108, 0.0856070593, -0.0293696672, 0.0713166744, -0.0038656164, 0.0581983738, 0.0872750208, 0.0472439155, 0.0461619943, 0.0632473454, -0.089709349, -0.0154962754, -0.001129115, 0.024365779, -0.042578131, 0.0765008852, 0.0147637241, 0.060677778, 0.0039895866, -0.0440657735, 0.1623784304, -0.0766812041, 0.0304741301, 0.0906560272, -0.0347792767, 0.0512109622, 0.0197450723, -0.0214919243, 0.0459365956, 0.0397155434, 0.1414612681, 0.0483258404, 0.0511658825, -0.0421724096, -0.1814022213, 0.1168475524, -0.0280398056, -0.0025413891, -0.07226336, 0.0000161456, 0.0843898952, 0.0336973555, -0.0058660447, 0.0110220779, -0.0642841831, 0.0389717221, 0.0056124693, 0.0361767597, -0.0288512465, 0.0090949051, -0.0009290722, -0.0833530575, -0.0773574039, -0.0877709016, -0.0694683939, -0.0031133427, 0.0048320205, 0.0069141565, 0.0091287149, 0.0400987267, 0.0160935856, 0.0623006597, 0.1750008464, 0.0735256001, 0.0737059191, 0.0127802007, 0.0933157504, -0.0025301191, 0.1260438859, -0.0330436938, 0.0067732809, -0.0108361226, 0.032232251, 0.0036683909, 0.0017891154, -0.0012425195, 0.0035021582, -0.0201057121, 0.0922338292, -0.0379799604, -0.0617146194, -0.022168126, 0.0854718164, 0.0609933399, 0.0063281152, 0.0761402473, -0.0413609669, 0.0627063811, -0.0642841831, -0.0381828211, 0.1179294735, 0.0104191322, -0.0362218395, -0.0344862565, -0.0366726406, -0.0746526048, -0.0188998207, -0.0972827971, -0.0397831649, -0.0109488228, 0.0184602905, 0.0034824356, -0.030947471, 0.0006835971, -0.022776708, 0.0199141223, 0.0517068431, 0.1064791307, -0.033021152, -0.0055279438, -0.048866801, 0.0174009092, 0.0233289376, -0.0014651024, -0.0194295123, 0.0289414078, 0.0227203574, 0.099176161, 0.1335271746, 0.019170301, 0.0355456397, -0.0574320145, 0.0625711456, 0.0076128975, -0.0657718256, 0.0716773197, 0.0385660045, 0.0088525992, -0.031420812, 0.0840743408, -0.0730297193, 0.0365599394, 0.0229006782, -0.0376418605, -0.1014301628, -0.0432543308, -0.0380025022, -0.0536452867, 0.0700995177, -0.0418343097, -0.0270931236, 0.0372361392, -0.0163866058, 0.0540960878, -0.0721281171, 0.1603047401, 0.013050681, -0.0043107821, 0.1044054478, 0.1404695064, 0.0490921997, 0.1073807329, 0.0637432262, -0.0095738806, -0.1016104892, 0.040865086, 0.0230584573, 0.0196887217, -0.0513462052, -0.0136367222, -0.0333817936, -0.0397606231, 0.0673947111, -0.0429162309, -0.055178009, -0.113331303, 0.0437952913, 0.0561697707, 0.0212665237, 0.1127903461, -0.0905658677, -0.034734197, 0.0216158945, -0.0423752703, -0.0418343097, -0.0981843993, -0.0371009, 0.1083724946, -0.0401438065, 0.0532395653, -0.1521001607, 0.0509404838 ]
712.0139
Tetsuo Kurosaki
Tetsuo Kurosaki
Direct definition of a ternary infinite square-free sequence
9 pages, 1 figures, to appear in Information Processing Letters
null
10.1016/j.ipl.2007.11.012
null
cs.DM
null
We propose a new ternary infinite (even full-infinite) square-free sequence. The sequence is defined both by an iterative method and by a direct definition. Both definitions are analogous to those of the Thue-Morse sequence. The direct definition is given by a deterministic finite automaton with output. In short, the sequence is automatic.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 13:25:01 GMT" } ]
2007-12-04T00:00:00
[ [ "Kurosaki", "Tetsuo", "" ] ]
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712.014
Yoshihisa Nishikawa
Yoshihisa Nishikawa
The von Neumann Entropy of EPR Spin Correlation for the Relativistic Pairs
15 pages, 9 figures; changed the title, revised the manuscript, added references
null
10.1142/S0217751X08041372
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Variation of the von Neumann entropy by the Lorentz transformation is discussed. Taking the spin-singlet state in the center of mass frame, the von Neumann entropy in the laboratory frame is calculated from the reduced density matrix obtained by taking the trace over 4-momentum after the Lorentz transformation. As the model to discuss the EPR spin correlation, it is supposed that one parent particle splits into a superposition state of various pair states in various directions. Computing the von Neumann entropy and the Shannon entropy, we have shown a global behavior of the entropy to see a relativistic effect. We discuss also the super-relativistic limit, distinguishability between the two particles of the pair and so on.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 05:21:09 GMT" }, { "version": "v2", "created": "Tue, 26 Aug 2008 10:43:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Nishikawa", "Yoshihisa", "" ] ]
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712.0141
Hans Huebl
Hans Huebl, Felix Hoehne, Benno Grolik, Andre R. Stegner, Martin Stutzmann, Martin S. Brandt
Electrical detection of spin echoes for phosphorus donors in silicon
14 pages, 3 figures
Phys. Rev. Lett. 100, 177602 (2008)
10.1103/PhysRevLett.100.177602
null
quant-ph
null
The electrical detection of spin echoes via echo tomography is used to observe decoherence processes associated with the electrical readout of the spin state of phosphorus donor electrons in silicon near a SiO$_2$ interface. Using the Carr-Purcell pulse sequence, an echo decay with a time constant of $1.7\pm0.2 \rm{\mu s}$ is observed, in good agreement with theoretical modeling of the interaction between donors and paramagnetic interface states. Electrical spin echo tomography thus can be used to study the spin dynamics in realistic spin qubit devices for quantum information processing.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 13:46:39 GMT" } ]
2008-05-06T00:00:00
[ [ "Huebl", "Hans", "" ], [ "Hoehne", "Felix", "" ], [ "Grolik", "Benno", "" ], [ "Stegner", "Andre R.", "" ], [ "Stutzmann", "Martin", "" ], [ "Brandt", "Martin S.", "" ] ]
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712.0142
Tomi Mikkonen
Tomi Mikkonen and Xavier Buchwalder
The Algebra of Graph Invariants - Lower and Upper Bounds for Minimal Generators
25 pages, 3 figures
null
null
null
math.CO math.AC
null
In this paper we study the algebra of graph invariants, focusing mainly on the invariants of simple graphs. All other invariants, such as sorted eigenvalues, degree sequences and canonical permutations, belong to this algebra. In fact, every graph invariant is a linear combination of the basic graph invariants which we study in this paper. To prove that two graphs are isomorphic, a number of basic invariants are required, which are called separator invariants. The minimal set of separator invariants is also the minimal basic generator set for the algebra of graph invariants. We find lower and upper bounds for the minimal number of generator/separator invariants needed for proving graph isomorphism. Finally we find a sufficient condition for Ulam's conjecture to be true based on Redfield's enumeration formula.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 14:11:34 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 18:55:28 GMT" } ]
2008-01-30T00:00:00
[ [ "Mikkonen", "Tomi", "" ], [ "Buchwalder", "Xavier", "" ] ]
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712.0143
Manolis K. Georgoulis
M.K. Georgoulis
Magnetic Complexity in Eruptive Solar Active Regions and Associated Eruption Parameters
16 pages, 2 figures, 1 table. Geophys. Res. Lett., in press
null
10.1029/2007GL032040
null
astro-ph
null
Using an efficient magnetic complexity index in the active-region solar photosphere, we quantify the preflare strength of the photospheric magnetic polarity inversion lines in 23 eruptive active regions with flare/CME/ICME events tracked all the way from the Sun to the Earth. We find that active regions with more intense polarity inversion lines host statistically stronger flares and faster, more impulsively accelerated, CMEs. No significant correlation is found between the strength of the inversion lines and the flare soft X-ray rise times, the ICME transit times, and the peak $Dst indices of the induced geomagnetic storms. Corroborating these and previous results, we speculate on a possible interpretation for the connection between source active regions, flares, and CMEs. Further work is needed to validate this concept and uncover its physical details.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 18:57:47 GMT" } ]
2015-05-13T00:00:00
[ [ "Georgoulis", "M. K.", "" ] ]
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712.0144
Lin Weiqiang Dr.
Weiqiang Lin, Yucai Su
Graded modules for Virasoro-like algebra
17pages, 0 figures
null
null
null
math.RT math.QA
null
In this paper, we consider the classification of irreducible ${\bf Z}$- and ${\bf Z}^2$-graded modules with finite dimensional homogeneous subspaces over the Virasoro-like algebra. We first prove that such a module is a uniformly bounded module or a generalized highest weight module. Then we determine all generalized highest weight irreducible modules. As a consequence, we also determine all the modules with nonzero center. Finally, we prove that there does not exist any nontrivial ${\bf Z}$-graded modules of intermediate series.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 14:11:12 GMT" } ]
2007-12-04T00:00:00
[ [ "Lin", "Weiqiang", "" ], [ "Su", "Yucai", "" ] ]
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712.0145
Sukanta Dutta
Sukanta Dutta (1) and Ashok Goyal (2) ((1) SGTB Khalsa College, University of Delhi India, (2)Department of Physics and Astrophysics, University of Delhi, India.)
Constraints on Astro-unparticle Physics from SN 1987A
12 pages, 2 postscript figures
JCAP0803:027,2008
10.1088/1475-7516/2008/03/027
null
hep-ph
null
SN 1987A observations have been used to place constraints on the interactions between standard model particles and unparticles. In this study we calculate the energy loss from the supernovae core through scalar, pseudo scalar, vector, pseudo vector unparticle emission from nuclear bremsstrahlung for degenerate nuclear matter interacting through one pion exchange. In order to examine the constraints on $d_{\cal U}=1$ we considered the emission of scalar, pseudo scalar, vector, pseudo vector and tensor through the pair annihilation process $e^+e^-\to {\cal U} \gamma $. In addition we have re-examined other pair annihilation processes. The most stringent bounds on the dimensionless coupling constants for $d_{\cal U} =1$ and $\Lambda_{\cal U}= m_Z$ are obtained from nuclear bremsstrahlung process for the pseudo scalar and pseudo-vector couplings $\bigl|\lambda^{\cal P}_{0,1}\bigr|\leq 4\times 10^{-11}$ and for tensor interaction, the best limit on dimensionless coupling is obtained from $e^+ e^-\to {\cal U} \gamma$ and we get $\bigl|\lambda^{\cal T}\bigr| \leq 6\times 10^{-6}$.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 19:01:25 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 16:45:41 GMT" }, { "version": "v3", "created": "Wed, 16 Jan 2008 11:28:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Dutta", "Sukanta", "" ], [ "Goyal", "Ashok", "" ] ]
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712.0146
Tomi Mikkonen
Tomi Mikkonen
The Ring of Graph Invariants - Graphic Values
36 pages, 10 figures
null
null
null
math.CO math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ring of graph invariants is spanned by the basic graph invariants which calculate the number of subgraphs isomorphic to a given graph in other graphs. These subgraphs counting invariants are not algebraically independent. In our view the most important problem in graph theory of unlabeled graphs is the problem of determining graphic values of arbitrary sets of graph invariants. This corresponds to explaining the syzygy of the graph invariants when the number of vertices is unbounded. We introduce two methods to explore this complicated structure. Sets of graphs with a small number of vertices impose constraints on larger sets. We describe families of inequalities of graph invariants. These inequalities allow to loop over all values of graph invariants which look like graphic from the small sets point of view. We also develop strong notion of graphic values where the existence of the corresponding graphs is guaranteed once the constraints are satisfied by the basic graph invariants. These constraints are necessary and sufficient for graphs whose local neighborhoods are generated by a finite set of locally connected graphs. The reconstruction of the graph from the basic graph invariants is shown to be NP-complete in this restricted case. Finally we apply these results to formulate the problem of Ramsey numbers as an integer polyhedron problem of moderate and adjustable dimension.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 14:05:11 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 02:04:24 GMT" }, { "version": "v3", "created": "Thu, 11 Dec 2008 17:14:02 GMT" } ]
2008-12-11T00:00:00
[ [ "Mikkonen", "Tomi", "" ] ]
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712.0147
Steven Duplij
Steven Duplij and Albert Kotvytskiy (Kharkov National University, Ukraine)
Coincidence limit and generalized interaction term structure in multigravity
13 pages, for the journal version see http://www.math.rutgers.edu/~duplij/publications/Duplij-Kotvitskiy-Vestnik.PDF
J.Kharkov Natl.Univ.Phys.Ser.36N4:61,2007
null
null
hep-th
null
Generalized structure of the interaction term of multigravity is analyzed in detail. The coincidence limit of any multigravity theory is defined and the compatibility equation for the interaction potential is derived which is studied in the weak perturbation limit of metric. The most general properties of the invariant volume and the scalar potential of multigravity are investigated. The general formula for multigravity invariant volume using three means (arithmetic, geometric and harmonic) is derived. The Pauli-Fierz mass term for bigravity in the weak field limit is obtained.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 14:34:59 GMT" } ]
2010-01-05T00:00:00
[ [ "Duplij", "Steven", "", "Kharkov National University,\n Ukraine" ], [ "Kotvytskiy", "Albert", "", "Kharkov National University,\n Ukraine" ] ]
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712.0148
Shengrong Zou
Sheng-Rong Zou, Zhong-Wei Guo, Yu-Jing Peng, Ta Zhou, Chang-Gui Gu, Da-Ren He
A Brand-new Research Method of Neuroendocrine System
9 pages with 3 figures
null
null
null
nlin.AO q-bio.NC
null
In this paper, we present the empirical investigation results on the neuroendocrine system by bipartite graphs. This neuroendocrine network model can describe the structural characteristic of neuroendocrine system. The act degree distribution and cumulate act degree distribution show so-called shifted power law-SPL function forms. In neuroendocrine network, the act degree stands for the number of the cells that secretes a single mediator, in which bFGF(basic fibroblast growth factor) is the largest node act degree. It is an important mitogenic cytokine, followed by TGF-beta, IL-6, IL1-beta, VEGF, IGF-1and so on. They are critical in neuroendocrine system to maintain bodily healthiness, emotional stabilization and endocrine harmony. The average act degree of neuroendocrine network is h = 3.01, It means each mediator is secreted by three cells on an average . The similarity that stand for the average probability of secreting the same mediators by all the neuroendocrine cells is s = 0.14. Our results may be used in the research of the medical treatment of neuroendocrine diseases.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 14:45:14 GMT" } ]
2007-12-04T00:00:00
[ [ "Zou", "Sheng-Rong", "" ], [ "Guo", "Zhong-Wei", "" ], [ "Peng", "Yu-Jing", "" ], [ "Zhou", "Ta", "" ], [ "Gu", "Chang-Gui", "" ], [ "He", "Da-Ren", "" ] ]
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712.0149
David Wallace
David Wallace
The Quantum Measurement Problem: State of Play
LaTeX, 85 pages. Forthcoming in Rickles (ed.), The Ashgate Companion to the New Philosophy of Physics
null
null
null
quant-ph
null
This is a preliminary version of an article to appear in the forthcoming Ashgate Companion to the New Philosophy of Physics. I don't advocate any particular approach to the measurement problem (not here, at any rate!) but I do focus on the importance of decoherence theory to modern attempts to solve the measurement problem, and I am fairly sharply critical of some aspects of the "traditional" formulation.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 19:06:54 GMT" } ]
2007-12-04T00:00:00
[ [ "Wallace", "David", "" ] ]
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712.015
Bounames Abdelhafid
A. Bounames and L. Chetouani
Klein's Paradox
18 pages, Latex, another title has been used in the published version
Phys. Lett. A 279 (2001) 139-150
10.1016/S0375-9601(00)00833-1
null
quant-ph
null
We solve the one dimensional Feshbach-Villars equation for spin-1/2 particle subjected to a scalar smooth potential. The eight component wave function is given in terms of the hypergeometric functions and via a limiting procedure, the wave functions of the step potential are deduced. These wave functions are used to test the validity of the boundary conditions deduced from the Feshbach-Villars transformation. The creation of pairs is predicted from the boundary condition of the charge density.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 15:22:49 GMT" } ]
2007-12-04T00:00:00
[ [ "Bounames", "A.", "" ], [ "Chetouani", "L.", "" ] ]
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712.0151
Huanjun Zhang
Huan-Jun Zhang
Top-Quark FCNC Decay t->cgg in Topcolor-assisted Technicolor Model
11 pages, 4 figures
Phys.Rev.D77:057501,2008
10.1103/PhysRevD.77.057501
null
hep-ph
null
The topcolor-assisted technicolor (TC2) model predicts several pseudo-scalars called top-pions and at loop level they can induce the FCNC top quark decay t->cgg which is extremely suppressed in the Standard Model (SM). We find that in the allowed parameter space the TC2 model can greatly enhance such a FCNC decay and push the branching ratio up to 10^{-3}, which is much larger than the predictions in the SM (10^{-9}) and in the minimal supersymmetric model (10^{-4}). We also compare the result with the two-body FCNC decay t-> cg and find that the branching ratio of t-> cgg is slightly larger than t-> cg. Such enhanced FCNC top quark decays may serve as a good probe of TC2 model at the future top quark factory.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 15:37:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Zhang", "Huan-Jun", "" ] ]
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712.0152
Delfim F. M. Torres
Gastao S. F. Frederico, Delfim F. M. Torres
Necessary Optimality Conditions for Fractional Action-Like Problems with Intrinsic and Observer Times
null
WSEAS Trans. Math., Issue 1, Volume 7, 2008, pp. 6--11.
null
null
math.OC math-ph math.MP
null
We prove higher-order Euler-Lagrange and DuBois-Reymond stationary conditions to fractional action-like variational problems. More general fractional action-like optimal control problems are also considered.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 15:50:07 GMT" } ]
2008-05-25T00:00:00
[ [ "Frederico", "Gastao S. F.", "" ], [ "Torres", "Delfim F. M.", "" ] ]
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712.0153
Anthony Coolen
A.C.C. Coolen and N. Shayeghi
Generating functional analysis of minority games with inner product strategy definitions
30 pages, 12 figures (some lower resolution to enable submission, originals available upon request), submitted to Journal of Physics A
null
10.1088/1751-8113/41/32/324005
null
physics.soc-ph
null
We use generating functional methods to solve the so-called inner product versions of the minority game (MG), with fake and/or real market histories, by generalizing the theory developed recently for look-up table MGs with real histories. The phase diagrams of the lookup table and inner product MG versions are generally found to be identical, with the exception of inner product MGs where histories are sampled linearly, which are found to be structurally critical. However, we encounter interesting differences both in the theory (where the role of the history frequency distribution in lookup table MGs is taken over by the eigenvalue spectrum of a history covariance matrix in inner product MGs) and in the static and dynamic phenomenology of the models. Our theoretical predictions are supported by numerical simulations.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 16:53:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Coolen", "A. C. C.", "" ], [ "Shayeghi", "N.", "" ] ]
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712.0154
Gilberto Tavares-Velasco
A. Cordero-Cid, J. M. Hernandez, G. Tavares-Velasco, J. J. Toscano
Bounding the top and bottom electric dipole moments from neutron experimental data
4 pages, 1 figure
J.Phys.G35:025004,2008
10.1088/0954-3899/35/2/025004
null
hep-ph
null
Heavy quarks, namely, the top and bottom quarks, may show great sensitiveness to new physics effects. In particular, they might have unusually large electric dipole moments. This possibility is analyzed via the corresponding one-loop correction to the neutron electric dipole moment, $d_n$. The current experimental limit on $d_n$ is used then to derive the uppers bounds $|d_t|<3.06\times 10^{-15}$ e-cm, $|d_b|<1.22\times 10^{-13}$ e-cm.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 17:15:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Cordero-Cid", "A.", "" ], [ "Hernandez", "J. M.", "" ], [ "Tavares-Velasco", "G.", "" ], [ "Toscano", "J. J.", "" ] ]
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712.0155
Alexander Maloney
Alexander Maloney and Edward Witten
Quantum Gravity Partition Functions in Three Dimensions
71 pages, 6 figures
JHEP 1002:029,2010
10.1007/JHEP02(2010)029
null
hep-th
null
We consider pure three-dimensional quantum gravity with a negative cosmological constant. The sum of known contributions to the partition function from classical geometries can be computed exactly, including quantum corrections. However, the result is not physically sensible, and if the model does exist, there are some additional contributions. One possibility is that the theory may have long strings and a continuous spectrum. Another possibility is that complex geometries need to be included, possibly leading to a holomorphically factorized partition function. We analyze the subleading corrections to the Bekenstein-Hawking entropy and show that these can be correctly reproduced in such a holomorphically factorized theory. We also consider the Hawking-Page phase transition between a thermal gas and a black hole and show that it is a phase transition of Lee-Yang type, associated with a condensation of zeros in the complex temperature plane. Finally, we analyze pure three-dimensional supergravity, with similar results.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 17:24:31 GMT" } ]
2010-04-07T00:00:00
[ [ "Maloney", "Alexander", "" ], [ "Witten", "Edward", "" ] ]
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712.0156
Nizar Demni
Marek Bozejko, Nizar Demni
Generating functions of Cauchy-Stieltjes type for orthogonal polynomials
accepted for publication in IDA-QP (Vol. 12, No. 1 March (2009)
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We characterize by the use of free probability the family of measures for which the mulitiplicative renormalization method applies with $h(x) = (1-x)^_{-1}$. This provides a representation formula for their Voiculescu Transforms.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 17:36:24 GMT" }, { "version": "v2", "created": "Mon, 2 Feb 2009 11:55:01 GMT" } ]
2009-02-02T00:00:00
[ [ "Bozejko", "Marek", "" ], [ "Demni", "Nizar", "" ] ]
[ 0.0447785817, -0.0124759981, 0.0517041348, -0.019301543, -0.0302524194, -0.0707556605, 0.0037002959, -0.0650552064, -0.0875570029, -0.0308774691, 0.0097007761, -0.036327906, -0.01075086, 0.0287773013, 0.0530042388, 0.1083086655, -0.0320525654, 0.0060442332, 0.0170763656, 0.0522041768, -0.012057214, -0.0859568715, 0.016613828, -0.0238144044, 0.05065405, -0.0036065385, -0.0855568424, -0.0709556714, 0.122909829, -0.0463037044, -0.0414533168, -0.0923573896, -0.0357278585, -0.1085086763, -0.0787563026, 0.0117259379, -0.0578546263, -0.0181889553, -0.0691555291, 0.1351108104, -0.0417283364, -0.045928672, -0.102708213, 0.0594047494, 0.1233098656, 0.0734058693, 0.109308742, -0.012300984, 0.0275522042, 0.0627550185, -0.0472537801, 0.0821565688, 0.0579546355, -0.0563045032, -0.0373029821, -0.0378030241, 0.0017907682, 0.0513041019, 0.0144511554, -0.0027970986, 0.0944575518, -0.1838147044, 0.0603048243, 0.0202891231, -0.0442535393, 0.0166388303, -0.0357778631, -0.0642551407, 0.1044083536, 0.0893071443, -0.0751560107, 0.0443035439, 0.0733058602, 0.0455786437, 0.0718057454, -0.0462036952, -0.0107821124, 0.0463037044, -0.0552044138, 0.1004580334, 0.0686554909, 0.13781102, 0.0215767249, 0.0568545461, 0.0920573622, -0.0958576649, 0.0542043336, -0.0142011354, -0.0110196313, 0.0438535064, -0.0505540445, -0.014663673, 0.0178264249, -0.0138761094, 0.0615049191, -0.0483288653, 0.0980078354, 0.0101508116, 0.0319025517, -0.0747559816, -0.000374444, 0.0639051124, 0.0709056705, -0.0453036241, 0.0964577124, 0.1215097159, -0.0320775658, 0.0286522917, -0.1402112097, 0.0280522443, -0.0056191995, -0.0555544421, -0.0529542342, -0.0605548434, 0.0915073156, 0.0536542907, -0.0573545881, -0.0431284495, -0.031027481, 0.0191265289, -0.1196095645, -0.0436784923, 0.0906072482, -0.0910072774, 0.0675554052, -0.0201766137, 0.0315775238, 0.0310024787, 0.0115696751, -0.0592047349, 0.0256270505, -0.0560544841, 0.0680554435, -0.0308024641, -0.0401532128, -0.059954796, 0.1568125486, -0.0519041531, 0.1327106208, 0.1204096302, 0.0432034545, 0.1171093658, -0.0324025899, 0.0648551881, -0.074355945, 0.0144636566, -0.0768061429, 0.0201891139, 0.043828506, 0.0088819601, 0.0132510597, -0.0570045598, 0.0186264906, 0.006513021, 0.0234643761, -0.0628550276, 0.0353278257, 0.0122572305, 0.0321025662, -0.0943075418, 0.0645551607, 0.0713056996, -0.0572045743, -0.0079193832, 0.0564545169, -0.0199015923, -0.0315525234, -0.0711056888, 0.0265771262, -0.0598047823, -0.0397781804, -0.0355528444, 0.0039940695, -0.0381780528, -0.0396031663, 0.0383030623, -0.1004580334, -0.13811104, -0.0702556223, -0.0020939175, 0.0193140451, 0.0497039743, 0.0002517779, 0.045703657, 0.0861568898, 0.0221767742, 0.029727377, -0.0401032083, 0.0397781804, 0.0036659183, -0.044403553, 0.0165513232, -0.0802064165, 0.1174093932, 0.0515041202, -0.1795143634, 0.0939075127, -0.0363029018, -0.0547543801, 0.0021251701, -0.0094632572, -0.1063085049, -0.0419783592, -0.0676554143, 0.044553563, -0.0155512439, 0.0290273223, 0.0107758623, -0.0511290878, 0.0835566819, -0.0447785817, -0.0288023036, -0.0102445697, 0.0102508198, -0.0702556223, 0.1094087511, -0.0678554252, 0.0120447129, -0.0397031754, 0.118609488, -0.0305274408, 0.0372029766, 0.1279102266, -0.0057348339, 0.0130760456, 0.0230768453, 0.0146011682, -0.0668553486, -0.0083444174, -0.0387030952, -0.0036940454, 0.0442785397, 0.0074880989, -0.1281102449, 0.0066505321, -0.0260770861, -0.0525542051, -0.0259520765, -0.085106805, -0.1244099513, -0.0272271782, 0.013601088, 0.019551564, -0.0623549856, -0.0059192237, 0.0487789027, 0.0345527641, 0.0138136046, 0.0555044375, -0.0538043045, -0.0395031609, 0.0975578055, 0.084956795, 0.0607048534, -0.0544043519, -0.0291273296 ]
712.0157
Edward Witten
Edward Witten
Conformal Field Theory In Four And Six Dimensions
16 pp; lectures presented at the Conference On Topology, Geometry, and Quantum Field Theory (Oxford University, 2002); minor error corrected in v. 2
null
null
null
math.RT math-ph math.MP
null
The goal of these notes is to give a brief explanation of how electric-magnetic duality in four dimensions is related to the existence of an unusual conformal field theory in six dimensions.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 17:39:13 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 16:17:10 GMT" } ]
2008-02-07T00:00:00
[ [ "Witten", "Edward", "" ] ]
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712.0158
Ersoy Sasioglu
E. Sasioglu, L. M. Sandratskii, P. Bruno
Role of the conduction electrons in mediating exchange interactions in Heusler alloys
16 pages, 9 figures, 2 tables
Phys. Rev. B 77, 064417 (2008)
10.1103/PhysRevB.77.064417
null
cond-mat.mtrl-sci cond-mat.str-el
null
Because of large spatial separation of the Mn atoms in Heusler alloys the Mn 3d states belonging to different atoms do not overlap considerably. Therefore an indirect exchange interaction between Mn atoms should play a crucial role in the ferromagnetism of the systems. To study the nature of the ferromagnetism of various Mn-based semi- and full-Heusler alloys we perform a systematic first-principles calculation of the exchange interactions in these materials. The calculation of the exchange parameters is based on the frozen-magnon approach. The calculations show that the magnetism of the Mn-based Heusler alloys depends strongly on the number of conduction electrons, their spin polarization and the position of the unoccupied Mn 3d states with respect to the Fermi level. Various magnetic phases are obtained depending on the combination of these characteristics. The Anderson's s-d model is used to perform a qualitative analysis of the obtained results. The conditions leading to diverse magnetic behavior are identified. If the spin polarization of the conduction electrons at the Fermi energy is large and the unoccupied Mn 3d states lie well above the Fermi level, an RKKY-type ferromagnetic interaction is dominating. On the other hand, the contribution of the antiferromagnetic superexchange becomes important if unoccupied Mn 3d states lie close to the Fermi energy. The resulting magnetic behavior depends on the competition of these two exchange mechanisms. The calculational results are in good correlation with the conclusions made on the basis of the Anderson s-d model which provides useful framework for the analysis of the results of first-principles calculations and helps to formulate the conditions for high Curie temperature.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 17:46:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Sasioglu", "E.", "" ], [ "Sandratskii", "L. M.", "" ], [ "Bruno", "P.", "" ] ]
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712.0159
Andrei Mironov
H.Itoyama, A.Mironov and A.Morozov
Boundary Ring: a way to construct approximate NG solutions with polygon boundary conditions: I. Z_n-symmetric configurations
42 pages, 5 figures
Nucl.Phys.B808:365-410,2009
10.1016/j.nuclphysb.2008.08.025
null
hep-th
null
We describe an algebro-geometric construction of polygon-bounded minimal surfaces in ADS_5, based on consideration of what we call the "boundary ring" of polynomials. The first non-trivial example of the Nambu-Goto (NG) solutions for Z_6-symmetric hexagon is considered in some detail. Solutions are represented as power series, of which only the first terms are evaluated. The NG equations leave a number of free parameters (a free function). Boundary conditions, which fix the free parameters, are imposed on truncated series. It is still unclear if explicit analytic formulas can be found in this way, but even approximate solutions, obtained by truncation of power series, can be sufficient to investigate the Alday-Maldacena -- BDS/BHT version of the string/gauge duality.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 17:47:39 GMT" } ]
2008-12-18T00:00:00
[ [ "Itoyama", "H.", "" ], [ "Mironov", "A.", "" ], [ "Morozov", "A.", "" ] ]
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712.016
Constantin Teleman
Constantin Teleman
The structure of 2D semi-simple field theories
Small errors corrected in v3. Agrees with published version
null
10.1007/s00222-011-0352-5
null
math.AT math-ph math.AG math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I classify all cohomological 2D field theories based on a semi-simple complex Frobenius algebra A. They are controlled by a linear combination of kappa-classes and by an extension datum to the Deligne-Mumford boundary. Their effect on the Gromov-Witten potential is described by Givental's Fock space formulae. This leads to the reconstruction of Gromov-Witten invariants from the quantum cup-product at a single semi-simple point and from the first Chern class, confirming Givental's higher-genus reconstruction conjecture. The proof uses the Mumford conjecture proved by Madsen and Weiss.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 18:10:16 GMT" }, { "version": "v2", "created": "Tue, 6 Oct 2009 17:23:27 GMT" }, { "version": "v3", "created": "Fri, 17 Feb 2012 17:48:30 GMT" } ]
2012-02-20T00:00:00
[ [ "Teleman", "Constantin", "" ] ]
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712.0161
Carlo Pierleoni
Carlo Pierleoni, Kris T. Delaney, Miguel A. Morales, David M. Ceperley and Markus Holzmann
Trial wave functions for High-Pressure Metallic Hydrogen
11 pages, 6 figures, submitted to Computer Physics Communications
null
10.1016/j.cpc.2008.01.041
null
physics.comp-ph
null
Many body trial wave functions are the key ingredient for accurate Quantum Monte Carlo estimates of total electronic energies in many electron systems. In the Coupled Electron-Ion Monte Carlo method, the accuracy of the trial function must be conjugated with the efficiency of its evaluation. We report recent progress in trial wave functions for metallic hydrogen implemented in the Coupled Electron-Ion Monte Carlo method. We describe and characterize several types of trial functions of increasing complexity in the range of the coupling parameter $1.0 \leq r_s \leq1.55$. We report wave function comparisons for disordered protonic configurations and preliminary results for thermal averages.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 17:59:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Pierleoni", "Carlo", "" ], [ "Delaney", "Kris T.", "" ], [ "Morales", "Miguel A.", "" ], [ "Ceperley", "David M.", "" ], [ "Holzmann", "Markus", "" ] ]
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712.0162
D. J. Saikia
M. Jamrozy (1), C. Konar (2,3), J. Machalski (1), D.J. Saikia (2) ((1) Uniwersytet Jagiellonski, Krakow, (2) NCRA, TIFR, Pune, (3) IUCAA, Pune)
A multifrequency study of giant radio sources-II. Spectral ageing analysis of the lobes of selected sources
12 Pages, 13 Figures, 9 Tables, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12772.x
null
astro-ph
null
Multifrequency observations with the GMRT and the VLA are used to determine the spectral breaks in consecutive strips along the lobes of a sample of selected giant radio sources (GRSs) in order to estimate their spectral ages. The maximum spectral ages estimated for the detected radio emission in the lobes of our sources range from $\sim$6 to 36 Myr with a median value of $\sim$20 Myr using the classical equipartition fields. Using the magnetic field estimates from the Beck & Krause formalism the spectral ages range from $\sim$5 to 38 Myr with a median value of $\sim$22 Myr. These ages are significantly older than smaller sources. In all but one source (J1313+6937) the spectral age gradually increases with distance from the hotspot regions, confirming that acceleration of the particles mainly occurs in the hotspots. Most of the GRSs do not exhibit zero spectral ages in the hotspots, as is the case in earlier studies of smaller sources. This is likely to be largely due to contamination by more extended emission due to relatively modest resolutions. The injection spectral indices range from $\sim$0.55 to 0.88 with a median value of $\sim$0.6. We discuss these values in the light of theoretical expectations, and show that the injection spectral index appears to be correlated with luminosity and/or redshift as well as with linear size.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:49:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Jamrozy", "M.", "" ], [ "Konar", "C.", "" ], [ "Machalski", "J.", "" ], [ "Saikia", "D. J.", "" ] ]
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712.0163
Constantin Teleman
Constantin Teleman
Branching of Hitchin's Prym cover for SL(2)
null
null
null
null
math.AG
null
It is shown that the map from the Jacobian of the spectral curve to the moduli of stable bundles of rank 2 is generically simply branched along an irreducible divisor. This observation falsifies the key step in the "abelianization of the SU(2) WZW connection" presented in a recent paper [Yoshida, Annals 2006]
[ { "version": "v1", "created": "Sun, 2 Dec 2007 18:32:10 GMT" } ]
2007-12-04T00:00:00
[ [ "Teleman", "Constantin", "" ] ]
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712.0164
Olivier Finkel
Olivier Finkel (ELM)
On Decidability Properties of Local Sentences
null
Theoretical Computer Science 364 (2) (2006) 196-211
null
null
cs.LO math.LO
null
Local (first order) sentences, introduced by Ressayre, enjoy very nice decidability properties, following from some stretching theorems stating some remarkable links between the finite and the infinite model theory of these sentences. We prove here several additional results on local sentences. The first one is a new decidability result in the case of local sentences whose function symbols are at most unary: one can decide, for every regular cardinal k whether a local sentence phi has a model of order type k. Secondly we show that this result can not be extended to the general case. Assuming the consistency of an inaccessible cardinal we prove that the set of local sentences having a model of order type omega_2 is not determined by the axiomatic system ZFC + GCH, where GCH is the generalized continuum hypothesis
[ { "version": "v1", "created": "Sun, 2 Dec 2007 18:34:00 GMT" } ]
2007-12-04T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ] ]
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712.0165
Olivier Finkel
Olivier Finkel (ELM)
On the Accepting Power of 2-Tape B\"uchi Automata
null
23rd International Symposium on Theoretical Aspects of Computer Science, STACS 2006, France (2006)
null
null
cs.CC cs.LO math.LO
null
We show that, from a topological point of view, 2-tape B\"uchi automata have the same accepting power than Turing machines equipped with a B\"uchi acceptance condition. In particular, we show that for every non null recursive ordinal alpha, there exist some Sigma^0_alpha-complete and some Pi^0_alpha-complete infinitary rational relations accepted by 2-tape B\"uchi automata. This very surprising result gives answers to questions of W. Thomas [Automata and Quantifier Hierarchies, in: Formal Properties of Finite automata and Applications, Ramatuelle, 1988, LNCS 386, Springer, 1989, p.104-119], of P. Simonnet [Automates et Th\'eorie Descriptive, Ph. D. Thesis, Universit\'e Paris 7, March 1992], and of H. Lescow and W. Thomas [Logical Specifications of Infinite Computations, In: "A Decade of Concurrency", LNCS 803, Springer, 1994, p. 583-621].
[ { "version": "v1", "created": "Sun, 2 Dec 2007 18:36:34 GMT" } ]
2007-12-04T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ] ]
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712.0166
Swetlana Hubrig
J.F. Gonzalez, S. Hubrig, D.W. Kurtz, V. Elkin, I. Savanov
Discovery of pulsational line profile variations in the delta Scuti star HD21190 and in the Ap Sr star HD218994
5 pages, 4 figures, 1 table, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12779.x
null
astro-ph
null
Asteroseismology has the potential to provide new insights into the physics of stellar interiors. We have obtained UVES high time resolution observations of the delta Scuti star HD21190 and of the Ap Sr star HD218994 to search for pulsational line profile variations. We report the discovery of a new roAp star, HD218994, with a pulsation period of 14.2 min. This is one of the most evolved roAp stars. No rapid pulsations have been found in the spectra of the cool Ap star - delta Scuti star HD21190. However, we detect with unprecedented clarity for a delta Sct star moving peaks in the cores of spectral lines that indicate the presence of high degree non-radial pulsations in this star.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 18:47:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Gonzalez", "J. F.", "" ], [ "Hubrig", "S.", "" ], [ "Kurtz", "D. W.", "" ], [ "Elkin", "V.", "" ], [ "Savanov", "I.", "" ] ]
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712.0167
Trieu Le
Trieu Le (University of Toronto)
The zero-product problem for Toeplitz operators with radial symbols
6 papes
null
null
null
math.FA
null
For any bounded measurable function $f$ on the unit ball $B_n$, let $T_f$ be the Toeplitz operator with symbol $f$ acting on the Bergman space $A^2(B_n)$. The Zero-Product Problem asks: if $f_1,..., f_N$ are bounded measurable functions such that $T_{f_1}... T_{f_N}=0$, does it follow that one of the functions must be zero almost everywhere? This paper give the affirmative answer to this question when all except possibly one of the symbols are radial functions. The answer in the general case remains unknown.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:06:24 GMT" } ]
2007-12-04T00:00:00
[ [ "Le", "Trieu", "", "University of Toronto" ] ]
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712.0168
Jacek Leszczynski
Jacek S. Leszczynski, Tomasz Blaszczyk
A novel numerical technique used in the solution of ordinary differential equations with a mixture of integer and fractional derivatives
31 pages, 6 figures, 6 tables. This manuscript was sent to the Journal of Numerical Algorithms
null
null
null
math.NA math.DS
null
Using both fractional derivatives, defined in the Riemann-Liouville and Caputo senses, and classical derivatives of the integer order we examine different numerical approaches to ordinary differential equations. Generally we formulate some algorithms where four discrete forms of the Caputo derivative and three different numerical techniques of solving ordinary differential equations are proposed. We then illustrate how to introduce classical initial conditions into equations where the Riemann-Liouville derivative is included.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:18:46 GMT" } ]
2007-12-04T00:00:00
[ [ "Leszczynski", "Jacek S.", "" ], [ "Blaszczyk", "Tomasz", "" ] ]
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712.0169
Rui Zheng
Rui Zheng
A Study of the Evaporative Deposition Process: Pipes and Truncated Transport Dynamics
25 pages, 22 figures, submitted to Physical Review E
null
null
null
cond-mat.soft
null
We consider contact line deposition and pattern formation of a pinned evaporating thin drop. We identify and focus on the transport dynamics truncated by the maximal concentration, proposed by Dupont, as the single deposition mechanism. The truncated process, formalized as "pipe models", admits a characteristic moving shock front solution that has a robust functional form and depends only on local conditions. By applying the models, we solve the deposition process and describe the deposit density profile in different asymptotic regimes. In particular, near the contact line the density profile follows a scaling law that is proportional to the square root of the concentration ratio, and the maximal deposit density/thickness occurs at about 2/3 of the total drying time for uniform evaporation and 1/2 for diffusion-controlled evaporation. Away from the contact line, we for the first time identify the power-law decay of the deposit profile with respect to the radial distance. In comparison, our work is consistent with and extends previous results. We also predict features of the depinning process and multiple-ring patterns within Dupont model, and our predictions are consistent with empirical evidence.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:48:36 GMT" } ]
2007-12-04T00:00:00
[ [ "Zheng", "Rui", "" ] ]
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712.017
Johannes Berg
Johannes Berg
Non-equilibrium dynamics of gene expression and the Jarzynski equality
null
null
10.1103/PhysRevLett.100.188101
null
q-bio.MN cond-mat.stat-mech
null
In order to express specific genes at the right time, the transcription of genes is regulated by the presence and absence of transcription factor molecules. With transcription factor concentrations undergoing constant changes, gene transcription takes place out of equilibrium. In this paper we discuss a simple mapping between dynamic models of gene expression and stochastic systems driven out of equilibrium. Using this mapping, results of nonequilibrium statistical mechanics such as the Jarzynski equality and the fluctuation theorem are demonstrated for gene expression dynamics. Applications of this approach include the determination of regulatory interactions between genes from experimental gene expression data.
[ { "version": "v1", "created": "Mon, 3 Dec 2007 18:18:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Berg", "Johannes", "" ] ]
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712.0171
Elchanan Mossel
Amin Coja-Oghlan and Elchanan Mossel and Dan Vilenchik
A Spectral Approach to Analyzing Belief Propagation for 3-Coloring
null
Combinatorics, Probability and Computing 18 (2009) 881 - 912
10.1017/S096354830900981X
null
cs.CC cs.AI cs.DM
null
Contributing to the rigorous understanding of BP, in this paper we relate the convergence of BP to spectral properties of the graph. This encompasses a result for random graphs with a ``planted'' solution; thus, we obtain the first rigorous result on BP for graph coloring in the case of a complex graphical structure (as opposed to trees). In particular, the analysis shows how Belief Propagation breaks the symmetry between the $3!$ possible permutations of the color classes.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:34:59 GMT" } ]
2017-11-17T00:00:00
[ [ "Coja-Oghlan", "Amin", "" ], [ "Mossel", "Elchanan", "" ], [ "Vilenchik", "Dan", "" ] ]
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712.0172
Chris Stock
C. Stock, C. Broholm, J. Hudis, H. J. Kang, and C. Petrovic
Spin resonance in the d-wave superconductor CeCoIn5
(5 pages, 4 figures, to be published in Phys. Rev. Lett.)
null
10.1103/PhysRevLett.100.087001
null
cond-mat.supr-con cond-mat.str-el
null
Neutron scattering is used to probe antiferromagnetic spin fluctuations in the d-wave heavy fermion superconductor CeCoIn$_{5}$ (T$_{c}$=2.3 K). Superconductivity develops from a state with slow ($\hbar\Gamma$=0.3 $\pm$ 0.15 meV) commensurate (${\bf{Q_0}}$=(1/2,1/2,1/2)) antiferromagnetic spin fluctuations and nearly isotropic spin correlations. The characteristic wavevector in CeCoIn$_{5}$ is the same as CeIn$_{3}$ but differs from the incommensurate wavevector measured in antiferromagnetically ordered CeRhIn$_{5}$. A sharp spin resonance ($\hbar\Gamma<0.07$ meV) at $\hbar \omega$ = 0.60 $\pm$ 0.03 meV develops in the superconducting state removing spectral weight from low-energy transfers. The presence of a resonance peak is indicative of strong coupling between f-electron magnetism and superconductivity and consistent with a d-wave gap order parameter satisfying $\Delta({\bf q+Q_0})=-\Delta({\bf q})$.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:40:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Stock", "C.", "" ], [ "Broholm", "C.", "" ], [ "Hudis", "J.", "" ], [ "Kang", "H. J.", "" ], [ "Petrovic", "C.", "" ] ]
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712.0173
Swetlana Hubrig
C. Schroeder, S. Hubrig, J.H.M.M. Schmitt
Magnetic fields in X-ray emitting A-type stars
2 pages, 1 figure, poster contribution presented at the CP/AP Workshop, Vienna, Austria in September 2007
Contrib.Astron.Obs.Skalnate Pleso 38:447-448,2008
null
null
astro-ph
null
A common explanation for the observed X-ray emission of A-type stars is the presence of a hidden late-type companion. While this hypothesis can be shown to be correct in some cases, there is also evidence suggesting that low-mass companions cannot be the proper cause for the observed X-ray activity in all cases. Babel & Montmerle (1997) presented a theoretical framework to explain the X-ray emission for magnetic Ap/Bp stars, focusing on the A0p star IQ Aur. We test if this theoretical model is capable to explain the observed X-ray emissions. We present observations of 13 A-type stars that have been associated with X-ray emission detected by ROSAT. To determine the mean longitudinal magnetic field strength we measured the circular polarization in the wings of the Balmer lines using FORS 1. Although the emission of those objects with magnetic fields fits the prediction of the Babel & Montmerle model, not all X-ray detections are related to the presence of a magnetic field. Additionally, the strengths of magnetic fields do not correlate with the X-ray luminosity and thus the magnetically confined wind shock model cannot explain the X-ray emission from all investigated stars.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:43:13 GMT" } ]
2010-11-26T00:00:00
[ [ "Schroeder", "C.", "" ], [ "Hubrig", "S.", "" ], [ "Schmitt", "J. H. M. M.", "" ] ]
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712.0174
Chris Stock
C. Stock, Guangyong Xu, P.M. Gehring, H. Luo, X. Zhao, H. Cao, J.F. Li, D. Viehland, and G. Shirane
Neutron and X-ray diffraction study of cubic [111] field cooled Pb(Mg1/3Nb2/3)O3
12 pages, 9 figures
Phys. Rev. B 76, 064122 (2007)
10.1103/PhysRevB.76.064122
null
cond-mat.mtrl-sci
null
Neutron and x-ray diffraction techniques have been used to study the competing long and short-range polar order in the relaxor ferroelectric Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ (PMN) under a [111] applied electric field. Despite reports of a structural transition from a cubic phase to a rhombohedral phase for fields E $>$ 1.7 kV/cm, we find that the bulk unit cell remains cubic (within a sensitivity of 90$^{\circ}$-$\alpha$ =0.03$^{\circ}$)for fields up to 8 kV/cm. Furthermore, we observe a structural transition confined to the near surface volume or `skin' of the crystal where the cubic cell is transformed to a rhombohedral unit cell at T$_{c}$=210 K for E $>$ 4 kV/cm, for which 90$^{\circ}$-$\alpha$=0.08 $\pm$ 0.03$^{\circ}$ below 50 K. While the bulk unit cell remains cubic, a suppression of the diffuse scattering and concomitant enhancement of the Bragg peak intensity is observed below T$_{c}$=210 K, indicating a more ordered structure with increasing electric field yet an absence of a long-range ferroelectric ground state in the bulk. The electric field strength has little effect on the diffuse scattering above T$_{c}$, however below T$_{c}$ the diffuse scattering is reduced in intensity and adopts an asymmetric lineshape in reciprocal space. The absence of hysteresis in our neutron measurements (on the bulk) and the presence of two distinct temperature scales suggests that the ground state of PMN is not a frozen glassy phase as suggested by some theories but is better understood in terms of random fields introduced through the presence of structural disorder. Based on these results, we also suggest that PMN represents an extreme example of the two-length scale problem, and that the presence of a distinct skin maybe necessary for a relaxor ground state.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:46:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Stock", "C.", "" ], [ "Xu", "Guangyong", "" ], [ "Gehring", "P. M.", "" ], [ "Luo", "H.", "" ], [ "Zhao", "X.", "" ], [ "Cao", "H.", "" ], [ "Li", "J. F.", "" ], [ "Viehland", "D.", "" ], [ "Shirane", "G.", "" ] ]
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712.0175
Andrey Kuzhuget V
Michael V Klibanov, Sergey I Kabanikhin, Dmitriy V Nechaev, Andrey V Kuzhuget
The Quasi-Reversibility Method for the Thermoacoustic Tomography and a Coefficient Inverse Problem
PDF, 33 pages, 16 figures
null
null
null
math-ph math.MP
null
An inverse problem of the determination of an initial condition in a hyperbolic equation from the lateral Cauchy data is considered. This problem has applications to the thermoacoustic tomography, as well as to linearized coefficient inverse problems of acoustics and electromagnetics. A new version of the quasi-reversibility method is described. This version requires a new Lipschitz stability estimate, which is obtained via the Carleman estimate. Numerical results are presented.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:46:38 GMT" } ]
2007-12-04T00:00:00
[ [ "Klibanov", "Michael V", "" ], [ "Kabanikhin", "Sergey I", "" ], [ "Nechaev", "Dmitriy V", "" ], [ "Kuzhuget", "Andrey V", "" ] ]
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712.0176
Swetlana Hubrig
J.F. Gonzalez, S. Hubrig, I. Savanov
A search for pulsational line profile variations in the delta Scuti star HD21190 and the Ap Sr star HD218994
2 pages, 1 figure, poster contribution presented at the CP/AP Workshop, Vienna, Austria in September 2007
null
null
null
astro-ph
null
We present the results of our recent search for pulsational line profile variations in high time resolution UVES spectra of the most evolved Ap star known, the delta Scuti star HD21190, and of the Ap Sr star HD218994. We found that HD218994 is an roAp star with a pulsation period of 5.1 min, which makes it the 36th star known to be a roAp star. No rapid pulsations have been found in the spectra of the delta Scuti star HD21190. However, we detect moving peaks in the cores of spectral lines, which indicate the presence of non-radial pulsations in this star.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 19:46:46 GMT" } ]
2007-12-04T00:00:00
[ [ "Gonzalez", "J. F.", "" ], [ "Hubrig", "S.", "" ], [ "Savanov", "I.", "" ] ]
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712.0177
Dmitri Melikhov
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
Systematic errors of bound-state parameters extracted by means of SVZ sum rules
8 pages, talk given at "Hadron 07", XII International Conference on Hadron Spectroscopy, Frascati, October 8-13, 2007
null
null
null
hep-ph
null
This talk presents the results of our study of systematic errors of the ground-state parameters obtained by Shifman-Vainshtein-Zakharov (SVZ) sum rules. We use the harmonic-oscillator potential model as an example: in this case we know the exact solution for the polarization operator, which allows us to obtain both the OPE to any order and the parameters (masses and decay constants) of the bound states. We extract the parameters of the ground state by making use of the standard procedures of the method of QCD sum rules, and compare the obtained results with their known exact values. We show that if the continuum contribution to the polarization operator is not known and is modelled by some effective continuum threshold, the standard procedures adopted in sum rules do not allow one to gain control over the systematic errors of the extracted ground-state parameters.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 21:30:55 GMT" } ]
2007-12-04T00:00:00
[ [ "Lucha", "Wolfgang", "" ], [ "Melikhov", "Dmitri", "" ], [ "Simula", "Silvano", "" ] ]
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712.0178
Dmitri Melikhov
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
Systematic errors of transition form factors extracted by means of light-cone sum rules
8 pages, talk given at "Hadron 07", XII International Conference on Hadron Spectroscopy, Frascati, October 8-13, 2007
null
null
null
hep-ph
null
This talk presents results of our study of heavy-to-light transition form factors extracted with the help of light-cone sum rules. We employ a model with scalar particles interacting via massless-boson exchange and study the heavy-to-light correlator, relevant for the extraction of the transition form factor. We calculate this correlator in two different ways: by making use of the Bethe-Salpeter wave function of the light bound state and by making use of the light-cone expansion. This allows us to calculate the full correlator and separately the light-cone contribution to it. In this way we show that the off-light cone contributions are not suppressed compared to the light-cone one by any large parameter. Numerically, the difference between the value of the form factor extracted from the full correlator and from the light-cone contribution to this correlator is found to be about 20-30% in a wide range of masses of the particles involved in the decay process.
[ { "version": "v1", "created": "Sun, 2 Dec 2007 20:15:38 GMT" } ]
2007-12-04T00:00:00
[ [ "Lucha", "Wolfgang", "" ], [ "Melikhov", "Dmitri", "" ], [ "Simula", "Silvano", "" ] ]
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