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711.2408
Philippe Gravejat
Fabrice Bethuel (LJLL), Philippe Gravejat (CEREMADE), Jean-Claude Saut (LM-Orsay)
Travelling waves for the Gross-Pitaevskii equation II
Final version accepted for publication in Communications in Mathematical Physics with a few minor corrections and added remarks
Communications in Mathematical Physics 285, 2 (2009) 567-651
10.1007/s00220-008-0614-2
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of this paper is to provide a rigorous mathematical proof of the existence of travelling wave solutions to the Gross-Pitaevskii equation in dimensions two and three. Our arguments, based on minimization under constraints, yield a full branch of solutions, and extend earlier results, where only a part of the branch was built. In dimension three, we also show that there are no travelling wave solutions of small energy.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:43:03 GMT" }, { "version": "v2", "created": "Tue, 26 Aug 2008 15:43:45 GMT" } ]
2009-02-09T00:00:00
[ [ "Bethuel", "Fabrice", "", "LJLL" ], [ "Gravejat", "Philippe", "", "CEREMADE" ], [ "Saut", "Jean-Claude", "", "LM-Orsay" ] ]
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711.2409
Fabrizio Durante
Fabrizio Durante, Erich Peter Klement, Jos\'e Juan Quesada-Molina
Copulas: compatibility and Fr\'echet classes
LaTeX, 14 pages
Journal of Inequalities and Applications, vol. 2008 (2008), Article ID 161537, 9 pages
10.1155/2008/161537
null
math.ST math.PR stat.TH
null
We determine under which conditions three bivariate copulas are compatible, viz. they are the bivariate marginals of the same trivariate copula, and, then, construct the class of these copulas. In particular, the upper and lower bounds for this class of trivariate copulas are determined.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:43:11 GMT" } ]
2009-03-22T00:00:00
[ [ "Durante", "Fabrizio", "" ], [ "Klement", "Erich Peter", "" ], [ "Quesada-Molina", "José Juan", "" ] ]
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711.241
Nicolas Cherroret
N. Cherroret, S.E. Skipetrov
Microscopic derivation of self-consistent equations of Anderson localization in a disordered medium of finite size
12 pages, 4 figures
Phys. Rev. E 77, 046608 (2008)
10.1103/PhysRevE.77.046608
null
cond-mat.dis-nn cond-mat.mes-hall
null
We present a microscopic derivation of self-consistent equations of Anderson localization in a disordered medium of finite size. The derivation leads to a renormalized, position-dependent diffusion coefficient. The position dependence of the latter is due to the position dependence of return probability in a bounded medium.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:52:25 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 10:10:21 GMT" } ]
2009-04-03T00:00:00
[ [ "Cherroret", "N.", "" ], [ "Skipetrov", "S. E.", "" ] ]
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711.2411
Andreas Ruttor
Andreas Ruttor
Neural Synchronization and Cryptography
PhD thesis, 120 pages, 73 figures
null
null
null
cond-mat.dis-nn
null
Neural networks can synchronize by learning from each other. In the case of discrete weights full synchronization is achieved in a finite number of steps. Additional networks can be trained by using the inputs and outputs generated during this process as examples. Several learning rules for both tasks are presented and analyzed. In the case of Tree Parity Machines synchronization is much faster than learning. Scaling laws for the number of steps needed for full synchronization and successful learning are derived using analytical models. They indicate that the difference between both processes can be controlled by changing the synaptic depth. In the case of bidirectional interaction the synchronization time increases proportional to the square of this parameter, but it grows exponentially, if information is transmitted in one direction only. Because of this effect neural synchronization can be used to construct a cryptographic key-exchange protocol. Here the partners benefit from mutual interaction, so that a passive attacker is usually unable to learn the generated key in time. The success probabilities of different attack methods are determined by numerical simulations and scaling laws are derived from the data. They show that the partners can reach any desired level of security by just increasing the synaptic depth. Then the complexity of a successful attack grows exponentially, but there is only a polynomial increase of the effort needed to generate a key. Further improvements of security are possible by replacing the random inputs with queries generated by the partners.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:47:03 GMT" } ]
2007-11-16T00:00:00
[ [ "Ruttor", "Andreas", "" ] ]
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711.2412
Pierre Bongrand
Pierre Bongrand (AC), Anne-Marie Benoliel (AC), Fabienne Richelme
Mechanical deformation of monocytic THP-1 cells : occurrence of two seqential phases with differential sensitivity to metabolic inhibitors
null
Experimental Biology Online - EBO 2 (1997) 5
null
null
physics.bio-ph q-bio.SC
null
Blood leukocytes can exhibit extensive morphological changes during their passage through small capillary vessels. The human monocytic THP-1 cell line was used to explore the metabolic dependence of these shape changes. Cells were aspirated into micropipettes for determination of the rate of protrusion formation. They were then released and the kinetics of morphological recovery was studied. Results were consistent with Evans' model (Blood, 64 : 1028, 1984) of a viscous liquid droplet surrounded by a tensile membrane. The estimated values of cytoplasmic viscosity and membrane tension were 162 Pa.s and 0.0142 millinewton/m respectively. The influence of metabolic inhibitors on cell mechanical behaviour was then studied : results strongly suggested that deformation involved two sequential phases. The cell elongation rate measured during the first 30 seconds following the onset of aspiration was unaffected by azide, an inhibitor of energy production, and it was about doubled by cytochalasin D, a microfilament inhibitor, and colchicine, a microtubule inhibitor. However, during the following two minutes, deformation was almost abolished in cells treated with azide and cytochalasin D, whereas the protrusion of control cells exhibited about threefold length increase. It is concluded that, although cells seemed to deform as passive objects, active metabolic processes were required to allow extensive morphological changes triggered by external forces.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:47:51 GMT" } ]
2007-11-16T00:00:00
[ [ "Bongrand", "Pierre", "", "AC" ], [ "Benoliel", "Anne-Marie", "", "AC" ], [ "Richelme", "Fabienne", "" ] ]
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711.2413
Peter Legi\v{s}a
Peter Legi\v{s}a
Adjacency preserving mappings on real symmetric matrices
Latex, 20 pages
null
null
null
math.RA math.MG
null
Let $S_{n}$ denote the space of all $n \times n$ real symmetric matrices. For n=2 or n>2 we characterize maps F from $S_{n}$ to $S_{m}$ which preserve adjacency, i.e. if rank(A-B)=1, then rank(F(A)-F(B))=1.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:47:53 GMT" } ]
2007-11-16T00:00:00
[ [ "Legiša", "Peter", "" ] ]
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711.2414
Haldun Sevincli
H. Sevincli, M. Topsakal and S. Ciraci
Superlattice Structures of Graphene based Nanoribbons
amended version
null
10.1103/PhysRevB.78.245402
null
cond-mat.mes-hall
null
Based on first-principles calculations we predict that periodically repeated junctions of armchair graphene nanoribbons of different widths form superlattice structures. In these superlattice heterostructures the width and the energy gap are modulated in real space and specific states are confined in certain segments. Orientation of constituent nanoribbons, their width and length, the symmetry of the junction are the structural parameters to engineer electronic properties of these quantum structures. Not only the size modulation, but also composition modulation, such as periodically repeated, commensurate heterojunctions of BN and graphene honeycomb nanoribbons result in a multiple quantum well structure. We showed that these graphene based quantum structures can introduce novel concepts to design nanodevices.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:06:07 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 13:36:03 GMT" }, { "version": "v3", "created": "Tue, 25 Mar 2008 19:35:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Sevincli", "H.", "" ], [ "Topsakal", "M.", "" ], [ "Ciraci", "S.", "" ] ]
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711.2415
Rafael I. Nepomechie
Changrim Ahn, Rafael I. Nepomechie and Junji Suzuki
The QCD spin chain S matrix
25 pages, 1 figure; v2: references added
Nucl.Phys.B798:402-422,2008
10.1016/j.nuclphysb.2007.12.026
UMTG-255
hep-th
null
Beisert et al. have identified an integrable SU(2,2) quantum spin chain which gives the one-loop anomalous dimensions of certain operators in large N QCD. We derive a set of nonlinear integral equations (NLIEs) for this model, and compute the scattering matrix of the various (in particular, magnon) excitations.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:49:44 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 16:00:20 GMT" }, { "version": "v3", "created": "Sat, 5 Jan 2008 04:21:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Ahn", "Changrim", "" ], [ "Nepomechie", "Rafael I.", "" ], [ "Suzuki", "Junji", "" ] ]
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711.2416
Jerome Petri
Jerome Petri
The magnetron instability in a pulsar's cylindrical electrosphere
Accepted by A&A
null
10.1051/0004-6361:20078442
null
astro-ph
null
(abridged) The physics of the pulsar magnetosphere remains poorly constrained by observations. Little is known about their emission mechanism. Large vacuum gaps probably exist, and a non-neutral plasma partially fills the neutron star surroundings to form an electrosphere. We showed that the differentially rotating equatorial disk in the pulsar's electrosphere is diocotron unstable and that it tends to stabilise when relativistic effects are included. However, when approaching the light cylinder, particle inertia becomes significant and the electric drift approximation is violated. In this paper, we study the most general instability, i.e. by including particle inertia effects, as well as relativistic motions. This general non-neutral plasma instability is called the magnetron instability. We linearise the coupled relativistic cold-fluid and Maxwell equations. The non-linear eigenvalue problem for the perturbed azimuthal electric field component is solved numerically. The spectrum of the magnetron instability in a non-neutral plasma column confined between two cylindrically conducting walls is computed for several cylindrical configurations. For a pulsar electrosphere, no outer wall exists. In this case, we allow for electromagnetic wave emission propagating to infinity. When the self-field induced by the plasma becomes significant, it can first increase the growth rate of the magnetron instability. However, equilibrium solutions are only possible when the self-electric field, measured by the parameter $s_{\rm e}$ and tending to disrupt the plasma configuration, is bounded to an upper limit, $s_{\rm e,max}$. For $s_{\rm e}$ close to but smaller than this value $s_{\rm e,max}$, the instability becomes weaker or can be suppressed as was the case in the diocotron regime.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 13:52:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Petri", "Jerome", "" ] ]
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711.2417
Hennebelle
P. Hennebelle, M.-M. Mac Low, E. Vazquez-Semadeni
Diffuse interstellar medium and the formation of molecular clouds
Proceeding of conference "Structure formation in the universe", held in Chamonix 2007. To be published in Structure formation in Astrophysics, Ed. G. Chabrier edited by Cambridge University Press, 2008
null
null
null
astro-ph
null
(Abridged) The formation of molecular clouds (MCs) from the diffuse interstellar gas appears to be a necessary step for star formation, as young stars invariably occur within them. However, the mechanisms controlling the formation of MCs remain controversial. In this contribution, we focus on their formation in compressive flows driven by interstellar turbulence and large-scale gravitational instability. Turbulent compression driven by supernovae appears insufficient to explain the bulk of cloud and star formation. Rather, gravity must be important at all scales, driving the compressive flows that form both clouds and cores. Cooling and thermal instability allow the formation of dense gas out of moderate, transonic compressions in the warm diffuse gas, and drive turbulence into the dense clouds. MCs may be produced by an overshoot beyond the thermal-pressure equilibrium between the cold and warm phases of atomic gas, caused by some combination of the ram pressure of compression and the self-gravity of the compressed gas. In this case, properties of the clouds such as their mass, mass-to-magnetic flux ratio, and total kinetic and gravitational energies are in general time-variable quantities. MCs may never enter a quasi-equilibrium or virial equilibrium state but rather continuously collapse to stars.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:05:20 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 10:01:16 GMT" } ]
2007-11-26T00:00:00
[ [ "Hennebelle", "P.", "" ], [ "Mac Low", "M. -M.", "" ], [ "Vazquez-Semadeni", "E.", "" ] ]
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711.2418
Marie-No\"elle C\'el\'erier
Laurent Nottale and Marie-No\"elle C\'el\'erier (LUTH, Observatoire de Paris-Meudon, CNRS, Universit\'e Paris VII)
Derivation of the postulates of quantum mechanics from the first principles of scale relativity
30 pages, no figure
J.Phys.A40:14471-14498,2007
10.1088/1751-8113/40/48/012
null
quant-ph
null
Quantum mechanics is based on a series of postulates which lead to a very good description of the microphysical realm but which have, up to now, not been derived from first principles. In the present work, we suggest such a derivation in the framework of the theory of scale relativity. After having analyzed the actual status of the various postulates, rules and principles that underlie the present axiomatic foundation of quantum mechanics (in terms of main postulates, secondary rules and derived `principles'), we attempt to provide the reader with an exhaustive view of the matter, by both gathering here results which are already available in the literature, and deriving new ones which complete the postulate list.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:27:31 GMT" } ]
2011-07-13T00:00:00
[ [ "Nottale", "Laurent", "", "LUTH, Observatoire de\n Paris-Meudon, CNRS, Université Paris VII" ], [ "Célérier", "Marie-Noëlle", "", "LUTH, Observatoire de\n Paris-Meudon, CNRS, Université Paris VII" ] ]
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711.2419
Josef Teichmann
Fabrice Baudoin, Martin Hairer, Josef Teichmann
Ornstein-Uhlenbeck Processes on Lie Groups
revised version, to appear in Journal of functional analysis
null
null
null
math.PR math.SP
null
We consider Ornstein-Uhlenbeck processes (OU-processes) associated to hypoelliptic diffusion processes on finite-dimensional Lie groups: let $ \mathcal{L} $ be a hypoelliptic, left-invariant ``sum of the squares''-operator on a Lie group $ G $ with associated Markov process $ X $, then we construct OU-processes by adding negative horizontal gradient drifts of functions $ U $. In the natural case $ U(x) = - \log p(1,x) $, where $ p(1,x) $ is the density of the law of $ X $ starting at identity $ e $ at time $ t =1 $ with respect to the right-invariant Haar measure on $G$, we show the Poincar\'e inequality by applying the Driver-Melcher inequality for ``sum of the squares'' operators on Lie groups. The resulting Markov process is called the natural OU-process associated to the hypoelliptic diffusion on $ G $. We prove the global strong existence of these OU-type processes on $ G $ under an integrability assumption on $U$. The Poincar\'e inequality for a large class of potentials $U$ is then shown by a perturbation technique. These results are applied to obtain a hypoelliptic equivalent of standard results on cooling schedules for simulated annealing on compact homogeneous spaces $M$.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:45:31 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 20:29:48 GMT" } ]
2008-05-12T00:00:00
[ [ "Baudoin", "Fabrice", "" ], [ "Hairer", "Martin", "" ], [ "Teichmann", "Josef", "" ] ]
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711.242
Tanja Hinderer
Tanja Hinderer
Tidal Love numbers of neutron stars
corrected Eqs. (20) and (23) and entries in Table (1)
Astrophys.J.677:1216-1220,2008
10.1086/533487
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a variety of fully relativistic polytropic neutron star models we calculate the star's tidal Love number k2. Most realistic equations of state for neutron stars can be approximated as a polytrope with an effective index n~0.5-1.0. The equilibrium stellar model is obtained by numerical integration of the Tolman-Oppenheimer-Volkhov equations. We calculate the linear l=2 static perturbations to the Schwarzschild spacetime following the method of Thorne and Campolattaro. Combining the perturbed Einstein equations into a single second order differential equation for the perturbation to the metric coefficient g_tt, and matching the exterior solution to the asymptotic expansion of the metric in the star's local asymptotic rest frame gives the Love number. Our results agree well with the Newtonian results in the weak field limit. The fully relativistic values differ from the Newtonian values by up to ~24%. The Love number is potentially measurable in gravitational wave signals from inspiralling binary neutron stars.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:44:17 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 16:34:49 GMT" }, { "version": "v3", "created": "Wed, 4 Mar 2009 23:36:13 GMT" }, { "version": "v4", "created": "Sat, 7 Mar 2009 02:10:36 GMT" } ]
2009-03-20T00:00:00
[ [ "Hinderer", "Tanja", "" ] ]
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711.2421
Haye Hinrichsen
Haye Hinrichsen
Dynamical response function of the disordered kinetic Ising model
14 pages, 3 eps figures
null
10.1088/1742-5468/2008/02/P02016
null
cond-mat.stat-mech
null
Recently Baumann et al. [arXiv:0709.3228v1] studied the phase-ordering kinetics of the two-dimensional Ising model with uniform spatially quenched disorder by Monte-Carlo simulations. They found that the two-time response and correlation functions are in agreement with the predictions of local scale invariance generalised to z!=2. The present paper shows why this is not true and suggests an alternative approach which leads to a much better agreement with the numerical results.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:35:50 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 11:18:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Hinrichsen", "Haye", "" ] ]
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711.2422
Dmitry Solnyshkov
G. Malpuech, D.D. Solnyshkov, I.A. Shelykh
Comment on PRL 99,140402 (2007) "Excitations in a nonequilibrium Bose Einstein Condensate of Exciton-polaritons" by M. Wouters and I. Carusotto
This comment has been withdrawn
null
null
null
cond-mat.mes-hall
null
This comment has been withdrawn by the authors due to crucial error.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:36:18 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 13:09:35 GMT" } ]
2007-11-22T00:00:00
[ [ "Malpuech", "G.", "" ], [ "Solnyshkov", "D. D.", "" ], [ "Shelykh", "I. A.", "" ] ]
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711.2423
Alexei Severyukhin
A.P. Severyukhin, V.V. Voronov, Nguyen Van Giai
Effects of the particle-particle channel on properties of low-lying vibrational states
8 pages REVTEX, 4 eps figures, submitted to Phys. Rev. C
Phys.Rev.C77:024322,2008
10.1103/PhysRevC.77.024322
null
nucl-th
null
Making use of the finite rank separable approach for the quasiparticle random phase approximation enables one to perform nuclear structure calculations in very large two-quasiparticle spaces. The approach is extended to take into account the residual particle-particle interaction. The calculations are performed by using Skyrme interactions in the particle-hole channel and density-dependent zero-range interactions in the particle-particle channel. To illustrate our approach, we study the properties of the lowest quadrupole states in the even-even nuclei $^{128}$Pd, $^{130}$Cd, $^{124-134}$Sn, $^{128-136}$Te and $^{136}$Xe.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:36:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Severyukhin", "A. P.", "" ], [ "Voronov", "V. V.", "" ], [ "Van Giai", "Nguyen", "" ] ]
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711.2424
Francisco Lobo
Christian G. Boehmer, Tiberiu Harko, Francisco S. N. Lobo
Wormhole geometries with conformal motions
7 pages. V2: clarifying comments added, to appear in Classical and Quantum Gravity
Class.Quant.Grav.25:075016,2008
10.1088/0264-9381/25/7/075016
null
gr-qc
null
Exact solutions of traversable wormholes were recently found under the assumption of spherical symmetry and the existence of a non-static conformal symmetry. In this paper, we verify that in the case of the conformally symmetric spacetimes with a non-static vector field generating the symmetry, the conformal factor $\psi$ can be physically interpreted in terms of a measurable quantity, namely, the tangential velocity of a massive test particle moving in a stable circular orbit in the spacetime. Physical properties of the rotational velocity of test particles and of the redshift of radiation emitted by ultra-relativistic particles rotating around these hypothetical general relativistic objects are further discussed. Finally, specific characteristics and properties of gravitational bremsstrahlung emitted by charged particles in geodesic motion in conformally symmetric wormhole geometries are also explored.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:45:25 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 15:31:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Boehmer", "Christian G.", "" ], [ "Harko", "Tiberiu", "" ], [ "Lobo", "Francisco S. N.", "" ] ]
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711.2425
Mohamed Assad Abdel-Raouf
Mohamed Assad Abdel-Raouf
Ab initio Calculations of the Interface States of Polyacetylene-Polyvinylfluoride and Polyethylene - Polyvinylfluoride Quasi-one-dimensional Chains
14 pages and 3 Tables
null
null
null
physics.chem-ph physics.comp-ph
null
The interface states appearing in polyacetylene-polyvinylfluoride and polyethylene-polyvinylfluoride are determined via an ab initio self consistent field technique based on Green matrix formalism. Different properties of these states are explored. Contrary to the results of the second pair, the results of the first pair showed that the active electronic structure of polyacetylene leads to new states lying in the energy gap of polyvinylfluoride which enhances the doping probability in the first pair. The results emphasize the appearance of bending band phenomenon as a result of the interface of systems considered.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:42:55 GMT" } ]
2007-11-16T00:00:00
[ [ "Abdel-Raouf", "Mohamed Assad", "" ] ]
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711.2426
Ken Hawick
K.A.Hawick, H.A.James and C.J.Scogings
Circuits, Attractors and Reachability in Mixed-K Kauffman Networks
null
null
null
CSTN-046
cond-mat.dis-nn
null
The growth in number and nature of dynamical attractors in Kauffman NK network models are still not well understood properties of these important random boolean networks. Structural circuits in the underpinning graph give insights into the number and length distribution of attractors in the NK model. We use a fast direct circuit enumeration algorithm to study the NK model and determine the growth behaviour of structural circuits. This leads to an explanation and lower bound on the growth properties and the number of attractor loops and a possible K-relationship for circuit number growth with network size N. We also introduce a mixed-K model that allows us to explore <K> between pairs of integer K values in Kauffman-like systems. We find that the circuits' behaviour is a useful metric in identifying phase transitional behaviour around the critical connectivity in that model too. We identify an intermediate phase transition in circuit growth behaviour at K_S approximately 1.5, that is distinct from both the percolation transition at K_P = 1 and the Kauffman transition at K_C = 2. We relate this transition to mutual node reachability within the giant component of nodes.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 01:33:35 GMT" } ]
2007-11-16T00:00:00
[ [ "Hawick", "K. A.", "" ], [ "James", "H. A.", "" ], [ "Scogings", "C. J.", "" ] ]
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711.2427
Jens Glaser
J. Glaser, O. Hallatschek, K. Kroy
Dynamic structure factor of a stiff polymer in a glassy solution
14 pages, 5 figures, final version
Eur. Phys. J. E 26, 123-136 (2008)
10.1140/epje/i2007-10321-2
null
cond-mat.soft
null
We provide a comprehensive overview of the current theoretical understanding of the dynamic structure factor of stiff polymers in semidilute solution based on the wormlike chain (WLC) model. We extend previous work by computing exact numerical coefficients and an expression for the dynamic mean square displacement (MSD) of a free polymer and compare various common approximations for the hydrodynamic interactions, which need to be treated accurately if one wants to extract quantitative estimates for model parameters from experimental data. A recent controversy about the initial slope of the dynamic structure factor is thereby resolved. To account for the interactions of the polymer with a surrounding (sticky) polymer solution, we analyze an extension of the WLC model, the glassy wormlike chain (GWLC), which predicts near power-law and logarithmic long-time tails in the dynamic structure factor.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:49:54 GMT" }, { "version": "v2", "created": "Thu, 29 May 2008 15:16:24 GMT" } ]
2008-05-29T00:00:00
[ [ "Glaser", "J.", "" ], [ "Hallatschek", "O.", "" ], [ "Kroy", "K.", "" ] ]
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711.2428
Philippe Brax
Philippe Brax
Embedding Dark Energy in Supergravity
7 pages,to appear in the conference proceedings of the 9th workshop on non-perturbative QCD, Institut d'Astrophysique de Paris, 4-8 June 2007
ECONFC0706044:24,2007
null
null
hep-ph
null
We give a brief overview of some of the constraints on the embedding of dark energy in supergravity.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:50:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Brax", "Philippe", "" ] ]
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711.2429
Yang-Shyang Li
Yang-Shyang Li, Amina Helmi (Kapteyn Astronomical Institute, University of Groningen)
Infall of substructures onto a Milky Way-like dark halo
9 pages, 10 figures, MNRAS in press
null
10.1111/j.1365-2966.2008.12854.x
null
astro-ph
null
We analyse the dynamical properties of substructures in a high-resolution dark matter simulation of the formation of a Milky Way-like halo in a $\Lambda$CDM cosmology. Our goal is to shed light on the dynamical peculiarities of the Milky Way satellites. Our simulations show that about 1/3 of the subhalos have been accreted in groups. We quantify this clustering by measuring the alignment of the angular momentum of subhalos in a group. We find that this signal is visible even for objects accreted up to $z \sim 1$, i.e. 8 Gyr ago, and long after the spatial coherence of the groups has been lost due the host tidal field. This group infall may well explain the ghostly streams proposed by Lynden-Bell & Lynden-Bell to orbit the Milky Way. Our analyses also show that if most satellites originate in a few groups, the disk-like distribution of the Milky Way satellites would be almost inevitable. This non-random assignment of satellites to subhalos implies an environmental dependence on whether these low-mass objects are able to form stars, possibly related to the nature of reionization in the early Universe. With this picture, both the ``ghostly streams'' and the ``disk-like configuration'' are manifestations of the same phenomenon: the hierarchical growth of structure down to the smallest scales.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:52:00 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 11:18:10 GMT" } ]
2008-03-11T00:00:00
[ [ "Li", "Yang-Shyang", "", "Kapteyn Astronomical Institute,\n University of Groningen" ], [ "Helmi", "Amina", "", "Kapteyn Astronomical Institute,\n University of Groningen" ] ]
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711.243
Alexey Chepurnov
A. Chepurnov, A. Lazarian, J. Gordon, S. Stanimirovic
Topology of Neutral Hydrogen Within the Small Magellanic Cloud
null
null
10.1086/591655
null
astro-ph
null
In this paper, genus statistics have been applied to an HI column density map of the Small Magellanic Cloud in order to study its topology. To learn how topology changes with the scale of the system, we provide the study of topology for column density maps at varying resolution. To evaluate the statistical error of the genus we randomly reassign the phases of the Fourier modes while keeping the amplitudes. We find, that at the smallest scales studied ($40 {pc}\leq\lambda\leq 80 {pc}$) the genus shift is in all regions negative, implying a clump topology. At the larger scales ($110 {pc}\leq\lambda\leq 250 {pc}$) the topology shift is detected to be negative in 4 cases and positive (``swiss cheese'' topology) in 2 cases. In 4 regions there is no statistically significant topology shift at large scales.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:55:01 GMT" }, { "version": "v2", "created": "Sat, 5 Jan 2008 10:34:03 GMT" }, { "version": "v3", "created": "Tue, 20 May 2008 18:08:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Chepurnov", "A.", "" ], [ "Lazarian", "A.", "" ], [ "Gordon", "J.", "" ], [ "Stanimirovic", "S.", "" ] ]
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711.2431
Gustavo Conesa Balbastre
G. Conesa (IFIC, Subatech), H. Delagrange (SUBATECH), J. Diaz (IFIC), Y.V. Kharlov (INSTITUTE for High-Energy Physics), Y. Schutz (SUBATECH, CERN)
Identification of photon-tagged jets in the ALICE experiment
NIM A: accepted manuscript
Nucl.Instrum.Meth.A585:28-39,2008
10.1016/j.nima.2007.10.050
null
physics.data-an
null
The ALICE experiment at LHC will detect and identify prompt photons and light neutral-mesons with the PHOS detector and the additional EMCal electromagnetic calorimeter. Charged particles will be detected and identified by the central tracking system. In this article, the possibility of studying the interaction of jets with the nuclear medium, using prompt photons as a tool to tag jets, is investigated by simulations. New methods to identify prompt photon-jet events and to distinguish them from the jet-jet background are presented.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 14:58:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Conesa", "G.", "", "IFIC, Subatech" ], [ "Delagrange", "H.", "", "SUBATECH" ], [ "Diaz", "J.", "", "IFIC" ], [ "Kharlov", "Y. V.", "", "INSTITUTE for High-Energy Physics" ], [ "Schutz", "Y.", "", "SUBATECH, CERN" ] ]
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711.2432
Smirnov Andrey
Smirnov Andrey
Two body systems from sl(2,C)-tops
9 pages
null
null
null
math.DS
null
It is shown that sl(2,$\mathbb{C}$) Euler-Arnold tops are equivalent to the two-body systems of Calogero-Moser type. We prove that generic Hamiltonians of sl(2,$\mathbb{C}$) tops are equivalent to one of three canonical Hamiltonians. For all canonical Hamiltonians the corresponding two-body system is found. Bosonisation formulas for each case are obtained explicitly. Relations with Antonov-Zabrodin-Hasegawa R-matrix are discussed.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:05:17 GMT" } ]
2007-11-16T00:00:00
[ [ "Andrey", "Smirnov", "" ] ]
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711.2433
J. Y. Vaishnav
Indubala I. Satija, Daniel C. Dakin, J. Y. Vaishnav, Charles W. Clark
Two-Dimensional Electron Gas with Cold Atoms in Non-Abelian Gauge Potentials
A version with higher resolution figures is available at http://physics.gmu.edu/~isatija/NALFinal.pdf
Phys. Rev. A 77, 043410 (2008)
10.1103/PhysRevA.77.043410
null
cond-mat.mes-hall
null
Motivated by the possibility of creating non-Abelian fields using cold atoms in optical lattices, we explore the richness and complexity of non-interacting two-dimensional electron gases (2DEGs) in a lattice, subjected to such fields. In the continuum limit, a non-Abelian system characterized by a two-component "magnetic flux" describes a harmonic oscillator existing in two different charge states (mimicking a particle-hole pair) where the coupling between the states is determined by the non-Abelian parameter, namely the difference between the two components of the "magnetic flux." A key feature of the non-Abelian system is a splitting of the Landau energy levels, which broaden into bands, as the spectrum depends explicitly on the transverse momentum. These Landau bands result in a coarse-grained "moth," a continuum version of the generalized Hofstadter butterfly. Furthermore, the bands overlap, leading to effective relativistic effects. Importantly, similar features also characterize the corresponding two-dimensional lattice problem when at least one of the components of the magnetic flux is an irrational number. The lattice system with two competing "magnetic fluxes" penetrating the unit cell provides a rich environment in which to study localization phenomena. Some unique aspects of the transport properties of the non-Abelian system are the possibility of inducing localization by varying the quasimomentum, and the absence of localization of certain zero-energy states exhibiting a linear energy-momentum relation. Furthermore, non-Abelian systems provide an interesting localization scenario where the localization transition is accompanied by a transition from relativistic to non-relativistic theory.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:22:39 GMT" } ]
2008-04-17T00:00:00
[ [ "Satija", "Indubala I.", "" ], [ "Dakin", "Daniel C.", "" ], [ "Vaishnav", "J. Y.", "" ], [ "Clark", "Charles W.", "" ] ]
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711.2434
Hemant Ishwaran
Hemant Ishwaran
Variable importance in binary regression trees and forests
Published in at http://dx.doi.org/10.1214/07-EJS039 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Electronic Journal of Statistics 2007, Vol. 1, 519-537
10.1214/07-EJS039
IMS-EJS-EJS_2007_39
stat.ML
null
We characterize and study variable importance (VIMP) and pairwise variable associations in binary regression trees. A key component involves the node mean squared error for a quantity we refer to as a maximal subtree. The theory naturally extends from single trees to ensembles of trees and applies to methods like random forests. This is useful because while importance values from random forests are used to screen variables, for example they are used to filter high throughput genomic data in Bioinformatics, very little theory exists about their properties.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:09:41 GMT" } ]
2009-09-29T00:00:00
[ [ "Ishwaran", "Hemant", "" ] ]
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711.2435
Tristram de Piro Dr.
Tristram de Piro
Some Geometry of Nodal Curves
null
null
null
null
math.AG math.LO
null
We find a geometrical method of analysing the singularities of a plane nodal curve. The main results will be used in a forthcoming paper on geometric Plucker formulas for such curves. Plane nodal curves, that is plane curves having at most nodes as singularities, form an important class of curves, as any projective algebraic curve is birational to a plane nodal curve.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:09:44 GMT" } ]
2007-11-16T00:00:00
[ [ "de Piro", "Tristram", "" ] ]
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711.2436
Ramaz Khomeriki
Ramaz Khomeriki, Jerome Leon, Stefano Ruffo, Sandro Wimberger
Nonlinear Dynamics in Double Square Well Potential
null
Theor. Math. Phys., v. 152, p.1122 (2007)
10.1007/s11232-007-0096-y
null
nlin.PS cond-mat.other math-ph math.MP physics.atom-ph
null
Considering the coherent nonlinear dynamics in double square well potential we find the example of coexistence of Josephson oscillations with a self-trapping regime. This macroscopic bistability is explained by proving analytically the simultaneous existence of symmetric, antisymmetric and asymmetric stationary solutions of the associated Gross-Pitaevskii equation. The effect is illustrated and confirmed by numerical simulations. This property allows to make suggestions on possible experiments using Bose-Einstein condensates in engineered optical lattices or weakly coupled optical waveguide arrays.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:19:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Khomeriki", "Ramaz", "" ], [ "Leon", "Jerome", "" ], [ "Ruffo", "Stefano", "" ], [ "Wimberger", "Sandro", "" ] ]
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711.2437
Jeremy Munday
J. N. Munday and Federico Capasso
Reply to "Comment on 'Precision measurement of the Casimir-Lifshitz force in a fluid'"
null
null
10.1103/PhysRevA.77.036103
null
quant-ph
null
We have reviewed the Comment of Geyer et al. [arXiv:0708.1548] concerning our recent work [Phys. Rev. A 75, 060102 (R) (2007)], and while we disagree with their criticisms, we acknowledge them for giving us the opportunity to add interesting addition material and a more detailed description of our experiment. We describe further our calculation and explain why a more sophisticated model is not warranted. We also present detailed experiments on the effects of electrostatic forces in our measurements and show that the contribution due to work function differences is small and that the residual electrostatic force is dominated by trapped charges and external fields. Finally, we estimate the effect of double layer interactions. These additional calculations and measurements support our original conclusion that the experimental results are consistent with the Lifshitz theory.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:53:24 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 14:58:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Munday", "J. N.", "" ], [ "Capasso", "Federico", "" ] ]
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711.2438
Guglielmo Lacorata
Guglielmo Lacorata, Andrea Mazzino and Umberto Rizza
3D chaotic model for sub-grid turbulent dispersion in Large Eddy Simulations
null
null
10.1175/2007JAS2410.1
null
nlin.CD
null
We introduce a 3D multiscale kinematic velocity field as a model to simulate Lagrangian turbulent dispersion. The incompressible velocity field is a nonlinear deterministic function, periodic in space and time, that generates chaotic mixing of Lagrangian trajectories. Relative dispersion properties, e.g. the Richardson's law, are correctly reproduced under two basic conditions: 1) the velocity amplitudes of the spatial modes must be related to the corresponding wavelengths through the Kolmogorov scaling; 2) the problem of the lack of "sweeping effect" of the small eddies by the large eddies, common to kinematic simulations, has to be taken into account. We show that, as far as Lagrangian dispersion is concerned, our model can be successfully applied as additional sub-grid contribution for Large Eddy Simulations of the planetary boundary layer flow.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:22:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Lacorata", "Guglielmo", "" ], [ "Mazzino", "Andrea", "" ], [ "Rizza", "Umberto", "" ] ]
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711.2439
Yue Yu
Yue Yu
Tripled composite fermion liquid in generalized Pfaffian of v=5/2 and non-abelian anyonic quasiholes with k=3
This paper has been withdrawn
null
null
null
cond-mat.mes-hall
null
This paper has been withdrawn by the author, due to an important sign error in Eqn. 2.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:25:41 GMT" }, { "version": "v2", "created": "Sun, 18 Nov 2007 02:38:19 GMT" }, { "version": "v3", "created": "Thu, 17 Jan 2008 11:03:05 GMT" } ]
2008-01-17T00:00:00
[ [ "Yu", "Yue", "" ] ]
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711.244
Mats Andersson
Mats Andersson
Uniqueness and factorization of Coleff-Herrera currents
null
null
null
null
math.CV
null
We prove a uniqueness result for Coleff-Herrera currents which in particular means that if $f=(f_1,..., f_m)$ defines a complete intersection, then the classical Coleff-Herrera product associated to $f$ is the unique Coleff-Herrera current that is cohomologous to 1 with respect to the operator $\delta_f-\dbar$, where $\delta_f$ is interior multiplication with $f$. From the uniqueness result we deduce that any Coleff-Herrera current on a variety $Z$ is a finite sum of products of residue currents with support on $Z$ and holomorphic forms.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:27:27 GMT" } ]
2007-11-16T00:00:00
[ [ "Andersson", "Mats", "" ] ]
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711.2441
A. Joel Saavedra
Sergio del Campo, Ramon Herrera and Joel Saavedra
Open Inflationary Universes in Gauss-Bonnet Brane Cosmology
Revtex, 4 Figures. Accepted by Modern Physics Letters A
Mod.Phys.Lett.A23:1187-1197,2008
10.1142/S0217732308025784
null
gr-qc hep-th
null
In this article, we study a type of one-field approach for open inflationary universe scenario in the context of braneworld models with a Gauss-Bonnet correction term. For a one-bubble universe model, we determine and characterize the existence of the Coleman-De Lucia instanton together with the period of inflation after tunneling has occurred. Our results are compared those analogous obtained when the usual Einstein Theory of Gravitation is used.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:30:13 GMT" } ]
2008-11-26T00:00:00
[ [ "del Campo", "Sergio", "" ], [ "Herrera", "Ramon", "" ], [ "Saavedra", "Joel", "" ] ]
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711.2442
Li Rong
Zhisheng Duan, Wenxu Wang, Chao Liu and Guanrong Chen
Are networks with more edges easier to synchronize?
14 pages, 18 figures
null
null
null
cs.NI
null
In this paper, the relationship between the network synchronizability and the edge distribution of its associated graph is investigated. First, it is shown that adding one edge to a cycle definitely decreases the network sychronizability. Then, since sometimes the synchronizability can be enhanced by changing the network structure, the question of whether the networks with more edges are easier to synchronize is addressed. It is shown by examples that the answer is negative. This reveals that generally there are redundant edges in a network, which not only make no contributions to synchronization but actually may reduce the synchronizability. Moreover, an example shows that the node betweenness centrality is not always a good indicator for the network synchronizability. Finally, some more examples are presented to illustrate how the network synchronizability varies following the addition of edges, where all the examples show that the network synchronizability globally increases but locally fluctuates as the number of added edges increases.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:34:55 GMT" } ]
2007-11-16T00:00:00
[ [ "Duan", "Zhisheng", "" ], [ "Wang", "Wenxu", "" ], [ "Liu", "Chao", "" ], [ "Chen", "Guanrong", "" ] ]
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711.2443
Guido Kings
Guido Kings
A note on polylogarithms on curves and abelian schemes
null
Math. Z., 262 (2009) 527-537
null
null
math.AG math.NT
null
In this note we investigate the connection between polylogarithms on curves and abelian schemes. The main result shows that the polylogarithm on the abelian scheme can be obtained as the push-forward of the polylogarithm on a suitable sub-curve. If the abelian scheme is the Jacobian of a smooth projective curve, this push-forward can also be written as a cup-product with the fundamental class of the curve.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:35:57 GMT" } ]
2010-02-04T00:00:00
[ [ "Kings", "Guido", "" ] ]
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711.2444
Richard Moot
Richard Moot (INRIA Futurs, Labri)
Proof nets for display logic
null
null
null
null
cs.CL
null
This paper explores several extensions of proof nets for the Lambek calculus in order to handle the different connectives of display logic in a natural way. The new proof net calculus handles some recent additions to the Lambek vocabulary such as Galois connections and Grishin interactions. It concludes with an exploration of the generative capacity of the Lambek-Grishin calculus, presenting an embedding of lexicalized tree adjoining grammars into the Lambek-Grishin calculus.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:39:48 GMT" } ]
2007-11-16T00:00:00
[ [ "Moot", "Richard", "", "INRIA Futurs, Labri" ] ]
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711.2445
Giampiero Esposito Dr.
Bryce S. DeWitt, Giampiero Esposito
An introduction to quantum gravity
68 pages, Latex file. Sections from 2 to 17 are published thanks to kind permission of Springer
Int.J.Geom.Meth.Mod.Phys.5:101-156,2008
10.1142/S0219887808002679
null
hep-th
null
After an overview of the physical motivations for studying quantum gravity, we reprint THE FORMAL STRUCTURE OF QUANTUM GRAVITY, i.e. the 1978 Cargese Lectures by Professor B.S. DeWitt, with kind permission of Springer. The reader is therefore introduced, in a pedagogical way, to the functional integral quantization of gravitation and Yang-Mills theory. It is hoped that such a paper will remain useful for all lecturers or Ph.D. students who face the task of introducing (resp. learning) some basic concepts in quantum gravity in a relatively short time. In the second part, we outline selected topics such as the braneworld picture with the same covariant formalism of the first part, and spectral asymptotics of Euclidean quantum gravity with diffeomorphism-invariant boundary conditions. The latter might have implications for singularity avoidance in quantum cosmology.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:47:27 GMT" } ]
2008-11-26T00:00:00
[ [ "DeWitt", "Bryce S.", "" ], [ "Esposito", "Giampiero", "" ] ]
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711.2446
Jonas Larson
Jonas Larson
Wave packet methods in cavity QED
Proceedings for "Time dependent phenomena in quantum mechanics" (Blaubeuren, 2007). 14 pages, 6 figures, uses jpconf.cls
null
10.1088/1742-6596/99/1/012011
null
quant-ph
null
The Jaynes-Cummings model, with and without the rotating wave approximation, is expressed in the conjugate variable representation and solved numerically by wave packet propagation. Both cases are then cast into systems of two coupled harmonic oscillators, reminiscent of coupled bound electronic potential curves of diatomic molecules. Using the knowledge of such models, this approach of the problem gives new insight of the dynamics. The effect of the rotating wave approximation is discussed. The collapse-revival phenomenon is especially analyzed in a non-standard manner. Extensions of the method is briefly mentioned in terms of a three-level atom and the Dicke model.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 15:55:26 GMT" } ]
2015-05-13T00:00:00
[ [ "Larson", "Jonas", "" ] ]
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711.2447
Radhey Shyam
R. Shyam
Production of hypernuclei with hadronic and electromagnetic probes
8 pages, 6 figures, To appear in proceedings of the Erice School 2007 on "Quarks in Hadrons and Nuclei"
Prog.Part.Nucl.Phys.61:212-218,2008
10.1016/j.ppnp.2007.12.008
null
nucl-th
null
We present an overview of a fully covariant formulation of describing the hypernuclear production with hadronic and electromagnetic probes. This theory is based on an effective Lagrangian picture and it focuses on production amplitudes that are described via creation, propagation and decay into relevant channel of N*(1650), N*(1710) and N*(1720) intermediate baryonic resonance states in the initial collision of the projectile with one of the target nucleons. The bound state nucleon and hyperon wave functions are obtained by solving the Dirac equation with appropriate scalar and vector potentials. Specific examples are discussed for reactions which are of interest to current and future experiments on the hypernuclear production.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:11:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Shyam", "R.", "" ] ]
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711.2448
Roberto Soria
Roberto Soria (MSSL/UCL), Kinwah Wu (MSSL/UCL), Zdenka Kuncic (Sydney Uni)
Characteristic temperatures and spectral appearance of ULX disks
4 pages, to appear in the proceedings of the symposium "X-rays from Nearby Galaxies", ESAC (Spain), Sept 2007
null
null
null
astro-ph
null
A standard disk around an accreting black hole may become effectively optically-thin and scattering dominated in the inner region, for high accretion rates (as already predicted by the Shakura-Sunyaev model). Radiative emission from that region is less efficient than blackbody emission, leading to an increase of the colour temperature in the inner region, by an order of magnitude above the effective temperature. We show that the integrated spectrum has a power-law-like shape in the ~ 1-5 keV band, with a soft excess at lower energies and a downward curvature or break at higher energies, in agreement with the observed spectra of many ultraluminous X-ray sources.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:17:31 GMT" } ]
2007-11-16T00:00:00
[ [ "Soria", "Roberto", "", "MSSL/UCL" ], [ "Wu", "Kinwah", "", "MSSL/UCL" ], [ "Kuncic", "Zdenka", "", "Sydney\n Uni" ] ]
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711.2449
Gavin Ramsay
Gavin Ramsay (Armagh Observatory)
The X-ray spectrum of RX J1914.4+2456 revisited
Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12726.x
null
astro-ph
null
It has been proposed that RX J1914.4+2456 is a stellar binary system with an orbital period of 9.5 mins. As such it shares many similar properties with RX J0806.3+1527 (5.4 mins). However, while the X-ray spectrum of RX J0806.3+1527 can be modelled using a simple absorbed blackbody, the X-ray spectrum of RX J1914.4+2456 has proved difficult to fit using a physically plausible model. In this paper we re-examine the available X-ray spectra of RX J1914.4+2456 taken using XMM-Newton. We find that the X-ray spectra can be fitted using a simple blackbody and an absorption component which has a significant enhancement of neon compared to the solar value. We propose that the material in the inter-binary system is significantly enhanced with neon. This makes its intrinsic X-ray spectrum virtually identical to RX J0806.3+1527. We re-access the X-ray luminosity of RX J1914.4+2456 and the implications of these results.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:26:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Ramsay", "Gavin", "", "Armagh Observatory" ] ]
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711.245
Osvaldo Civitarese
O. Civitarese, M. E. Mosquera
Testing Primordial Abundances With Sterile Neutrinos
7 pages, 3 figures, 1 table, 34 references
Phys.Rev.C77:045806,2008
10.1103/PhysRevC.77.045806
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The mixing between sterile and active neutrinos is taken into account in the calculation of Big Bang Nucleosynthesis. The abundances of primordial elements, like D, 3He, 4He and 7Li, are calculated by including sterile neutrinos, and by using finite chemical potentials. It is found that the resulting theoretical abundances are consistent with WMAP data on baryonic densities, and with limits of LSND on mixing angles, only if 7Li is excluded from the statistical analysis of theoretical and experimental results.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:40:09 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 19:57:21 GMT" }, { "version": "v3", "created": "Wed, 3 Sep 2008 14:28:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Civitarese", "O.", "" ], [ "Mosquera", "M. E.", "" ] ]
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711.2451
Dmitry Malyshev
Dmitry Malyshev and Herman Verlinde
D-branes at Singularities and String Phenomenology
24 pages, 5 figures, based on lectures of H.Verlinde at the Cargese 2006 summer school
Nucl.Phys.Proc.Suppl.171:139-163,2007
10.1016/j.nuclphysbps.2007.06.009
null
hep-th
null
In these notes we give an introduction to some of the concepts involved in constructing SM-like gauge theories in systems of branes at singularities of CY manifolds. These notes are an expanded version of lectures given by Herman Verlinde at the Cargese 2006 Summer School.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:59:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Malyshev", "Dmitry", "" ], [ "Verlinde", "Herman", "" ] ]
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711.2452
Wolfgang Schleifenbaum
C. Feuchter and H. Reinhardt
The Yang-Mills Vacuum in Coulomb Gauge in D=2+1 Dimensions
20 pages, 6 figures
Phys.Rev.D77:085023,2008
10.1103/PhysRevD.77.085023
null
hep-th
null
The variational approach to the Hamilton formulation of Yang-Mills theory in Coulomb gauge developed by the present authors previously is applied to Yang-Mills theory in 2+1 dimensions and is confronted with the existing lattice data. We show that the resulting Dyson-Schwinger equations (DSE) yield consistent solutions in 2+1 dimensions only for infrared divergent ghost form factor and gluon energy. The obtained numerical solutions of the DSE reproduce the analytic infrared results and are in satisfactory agreement with the existing lattice date in the whole momentum range.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:42:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Feuchter", "C.", "" ], [ "Reinhardt", "H.", "" ] ]
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711.2453
Dongho Chae
Dongho Chae
Global regularity for the 3D Navier-Stokes and the 3D Euler equations
9 pages
null
null
null
math.AP
null
The article `Global regularity for the 3D Navier-Stokes and the 3D Euler equations'(arXiv:0711.2453) is withdrawn due to a serious error in the proof.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:35:00 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 09:02:37 GMT" } ]
2007-11-16T00:00:00
[ [ "Chae", "Dongho", "" ] ]
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711.2454
Misha Feigin
Yang Chen, Mourad E.H. Ismail
Ladder Operators for q-orthogonal Polynomials
15 pages, typos corrected
null
10.1016/j.jmaa.2008.03.031
null
math-ph math.CA math.MP
null
The q-difference analog of the classical ladder operators is derived for those orthogonal polynomials arising from a class of indeterminate moments problem.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:43:52 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 12:35:00 GMT" } ]
2015-05-13T00:00:00
[ [ "Chen", "Yang", "" ], [ "Ismail", "Mourad E. H.", "" ] ]
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711.2455
Simone Speziale
Etera R. Livine and Simone Speziale
Physical boundary state for the quantum tetrahedron
20 pages, 6 figures
Class.Quant.Grav.25:085003,2008
10.1088/0264-9381/25/8/085003
pi-qg-69
gr-qc hep-th
null
We consider stability under evolution as a criterion to select a physical boundary state for the spinfoam formalism. As an example, we apply it to the simplest spinfoam defined by a single quantum tetrahedron and solve the associated eigenvalue problem at leading order in the large spin limit. We show that this fixes uniquely the free parameters entering the boundary state. Remarkably, the state obtained this way gives a correlation between edges which runs at leading order with the inverse distance between the edges, in agreement with the linearized continuum theory. Finally, we give an argument why this correlator represents the propagation of a pure gauge, consistently with the absence of physical degrees of freedom in 3d general relativity.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 16:55:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Livine", "Etera R.", "" ], [ "Speziale", "Simone", "" ] ]
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711.2456
Jeremy S. Sanders
J.S. Sanders (1), A.C. Fabian (1), S.W. Allen (2), R.G. Morris (2), J. Graham (1), R.M. Johnstone (1) ((1) Institute of Astronomy, Cambridge, (2) KIPAC, Stanford)
Cool X-ray emitting gas in the core of the Centaurus cluster of galaxies
15 pages, 20 figures, 5 with colour, accepted by MNRAS, now includes minor corrections suggested by referee, in particular a plot showing the ratios of abundances compared to Chandra
null
10.1111/j.1365-2966.2008.12952.x
null
astro-ph
null
We use a deep XMM-Newton Reflection Grating Spectrometer observation to examine the X-ray emission from the core of the Centaurus cluster of galaxies. We clearly detect Fe-XVII emission at four separate wavelengths, indicating the presence of cool X-ray emitting gas in the core of the cluster. Fe ions from Fe-XVII to XXIV are observed. The ratio of the Fe-XVII 17.1A lines to 15.0A line and limits on O-VII emission indicate a lowest detected temperature in the emitting region of 0.3 to 0.45 keV (3.5 to 5.2x10^6 K). The cluster also exhibits strong N-VII emission, making it apparent that the N abundance is supersolar in its very central regions. Comparison of the strength of the Fe-XVII lines with a Solar metallicity cooling flow model in the inner 17 kpc radius gives mass deposition rates in the absence of heating of 1.6-3 Msun/yr. Spectral fitting implies an upper limit of 0.8 Msun/yr below 0.4 keV, 4 Msun/yr below 0.8 keV and 8 Msun/yr below 1.6 keV. The cluster contains X-ray emitting gas over at least the range of 0.35 to 3.7 keV, a factor of more than 10 in temperature. We find that the best fitting metallicity of the cooler components is smaller than the hotter ones, confirming that the apparent metallicity does decline within the inner 1 arcmin radius.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:10:32 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 18:13:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Sanders", "J. S.", "" ], [ "Fabian", "A. C.", "" ], [ "Allen", "S. W.", "" ], [ "Morris", "R. G.", "" ], [ "Graham", "J.", "" ], [ "Johnstone", "R. M.", "" ] ]
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711.2457
Elizabeth R. Stanway
E. R. Stanway (Bristol, UK), M. N. Bremer (Bristol, UK), M. D. Lehnert (GEPI, Paris, Fr), J. J. Eldridge (IoA Cambridge, UK)
M-Dwarfs at Large Heliocentric Distances
15 Pages, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12711.x
null
astro-ph
null
We present an analysis of the faint M star population seen as foreground contaminants in deep extragalactic surveys. We use space-based data to separate such stars from high redshift galaxies in a publically-available dataset, and consider the photometric properties of the resulting sample in the optical and infrared. The inferred distances place these stars well beyond the scale height of the thick disk. We find strong similarities between this faint sample (reaching i'_{AB}=25) and the brighter disk M dwarf population studied by other authors. The optical-infrared properties of the bulk of our sources spanning 6000A-4.5microns are consistent with those 5-10 magnitudes brighter. We also present deep spectroscopy of faint M dwarf stars reaching continuum limits of i'_{AB}~26, and measure absorption line strengths in the CaH2 and TiO5 bands. Both photometrically and spectroscopically, our sources are consistent with metallicities as low as a tenth solar: metal-rich compared with halo stars at similar heliocentric distances. We comment on the possible MACHO identification of M stars at faint magnitudes.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:02:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Stanway", "E. R.", "", "Bristol, UK" ], [ "Bremer", "M. N.", "", "Bristol, UK" ], [ "Lehnert", "M. D.", "", "GEPI, Paris, Fr" ], [ "Eldridge", "J. J.", "", "IoA Cambridge, UK" ] ]
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711.2458
Javier Vasquez
C. Cappa (1,2), V.S. Niemela (1), R. Amorin (3) and J.Vasquez (1,2) (1-Instituto Argentino de Radioastronomia, Argentina) (2-Universidad Nacional de La Plata, Argentina) (3-Instituto de Astrofisica de Canarias, Spain)
The environs of the HII region Gum31
null
null
10.1051/0004-6361:20067028
IAR-11-07
astro-ph
null
We analyze the distribution of the interstellar matter in the environs of the HII region Gum31, excited by the open cluster NGC3324, located in the complex Carina region, with the aim of investigating the action of the massive stars on the surrounding neutral material. We use neutral hydrogen 21-cm line data, radio continuum images at 0.843, 2.4 and 4.9 GHz, 12CO(1-0) observations, and IRAS and MSX infrared data. Adopting a distance of 3 kpc for the HII region and the ionizing cluster, we derived an electron density of 33+/-3 cm^-3 and an ionized mass of (3.3+/-1.1)x10^3 Mo based on the radio continuum data at 4.9 GHz. The HI 21-cm line images revealed an HI shell surrounding the HII region. The HI structure is 10.0+/-1.7 pc in radius, has a neutral mass of 1500+/-500 Mo, and is expanding at 11 km/s. The associated molecular gas amounts to 1.1+/-0.5)x10^5 Mo, being its volume density of about 350 cm^3. This molecular shell could represent the remains of the cloud where the young open cluster NGC3324 was born or could have originated by the shock front associated with the HII region. The difference between the ambient density and the electron density of the HII region suggests that the HII region is expanding. The distributions of the ionized and molecular material, along with that of the emission in the MSX band A, suggest that a photodissociation region has developed at the interface between the ionized and molecular gas. The characteristics of a relatively large number of the IRAS, MSX, and 2MASS point sources projected onto the molecular envelope are compatible with protostellar candidates, showing the presence of active star forming regions. Very probably, the expansion of the HII region has triggered stellar formation in the molecular shell.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:02:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Cappa", "C.", "" ], [ "Niemela", "V. S.", "" ], [ "Amorin", "R.", "" ], [ "Vasquez", "J.", "" ] ]
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711.2459
Mendels
A. Olariu, P. Mendels, F. Bert, F. Duc, J.C. Trombe, M.A. de Vries, A. Harrisson
17O NMR study of the intrinsic magnetic susceptibility and spin dynamics of the quantum kagome antiferromagnet ZnCu3(OH)6Cl2
Accepted for publication in Phys. Rev. Lett., 3 jan. 2008 Figure 1 has been modified to include a two-components fit of the 17O NMR spectrum
null
10.1103/PhysRevLett.100.087202
null
cond-mat.str-el
null
We report through 17O NMR, an unambiguous local determination of the intrinsic kagome lattice spin susceptibility as well as that created around non-magnetic defects issued from natural Zn/ Cu exchange in the S=1/2 (Cu2+) herbertsmithite ZnCu3(OH)6Cl2 compound. The issue of a singlet-triplet gap is addressed. The magnetic response around a defect is found to markedly differ from that observed in non-frustrated antiferromagnetic materials. Finally, we discuss our relaxation measurements in the light of Cu and Cl NMR data [cond-mat 070314] and suggest a flat q-dependence of the excitations.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 10:49:39 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 15:09:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Olariu", "A.", "" ], [ "Mendels", "P.", "" ], [ "Bert", "F.", "" ], [ "Duc", "F.", "" ], [ "Trombe", "J. C.", "" ], [ "de Vries", "M. A.", "" ], [ "Harrisson", "A.", "" ] ]
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711.246
Oliver Dragi\v{c}evi\'c
Oliver Dragi\v{c}evi\'c and Alexander Volberg
Linear dimension-free estimates for the Hermite-Riesz transforms
44 pages; improvements of the main results (as compared to the previous version);
null
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We utilize the Bellman function technique to prove a bilinear dimension-free inequality for the Hermite operator. The Bellman technique is applied here to a non-local operator, which at first did not seem to be feasible. As a consequence of our bilinear inequality one proves dimension-free boundedness for the Riesz-Hermite transforms on L^p with linear growth in terms of p. A feature of the proof is a theorem establishing L^p(R^n) estimates for a class of spectral multipliers with bounds independent of n and p. Connections with known results on the Heisenberg group as well as with results for the Hilbert transform along the parabola are also explored. We believe our approach is quite universal in the sense that one could apply it to a whole range of Riesz transforms arising from various differential operators. As a first step towards this goal we prove our dimension-free bilinear embedding theorem for quite a general family of Schroedinger semigroups.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:27:19 GMT" }, { "version": "v2", "created": "Mon, 10 Nov 2008 19:14:28 GMT" } ]
2008-11-10T00:00:00
[ [ "Dragičević", "Oliver", "" ], [ "Volberg", "Alexander", "" ] ]
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711.2461
Orsola De Marco
Orsola De Marco
[WC] and PG1159 Central Stars of Planetary Nebula: the Need for an Alternative to the Born-Again Scenario
12 pages, 2 figures. To be published in the proceedings of the third symposium on hydrogen deficient stars. Tubingen September 2007
null
null
null
astro-ph
null
Hydrogen-deficient central stars of planetary nebula such as Wolf-Rayet and PG1159 central stars and some weak emission line stars are primarily composed of helium and carbon. This abundance is well explained by a scenario where a single post-AGB star experiences a last helium shell flash which ingests and burns, or simply dilutes, the remaining hydrogen atmosphere. But despite its success in matching the photospheric abundances of these stars, this scenario is faced with several observational challenges. A binary scenario is proposed here as a more natural way to face some of the most stringent observational constraints. In this scenario the H-rich primary in a close binary formed during a common envelope on the AGB, suffers a last helium shell flash, which results in a H-deficient primary with some of the characteristics needed to match the observations.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:12:50 GMT" } ]
2007-11-16T00:00:00
[ [ "De Marco", "Orsola", "" ] ]
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711.2462
Jean Pradines
Jean Pradines
Groupo\"ides de Lie et Feuilletages
56 pages, 1 figure, lecture delivered in Paris, October 2003, Journ\'ees Feuilletages et Quantification G\'eom\'etrique
Feuilletages et Quantification G\'eom\'etrique, Textes des Journ\'ees d'\'etude des 16 et 17 octobre 2003, Maison des Sciences de l'Homme, 54 Boulevard Raspail, Paris
null
null
math.GT math.CT
null
This is a survey concerning the relationship between Lie Groupoids (and their morphisms) and singular foliations in the sense of Sussmann-Stefan (considered from a purely geometrical point of view). We focus on the interaction between the algebraic and differentiable structures underlying Lie groupoids, and between groups and graphs of equivalence relations, regarded as two basic degeneracies for groupoids. Historical remarks, motivations and examples are developed in five appendices.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:02:31 GMT" } ]
2007-11-16T00:00:00
[ [ "Pradines", "Jean", "" ] ]
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711.2463
Wenwu Tian
Wenwu Tian, et al
The Distance of 4 kpc to the SNR CTB 109/AXP 1E 2259+586 system
The paper was replaced by a new paper (see arXiv1002.1093T)
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We suggest a revised distance to the supernova remnant (SNR) G109.1-1.0 (CTB 109) and its associated anomalous X-ray pulsar (AXP) 1E 2259+586 by analyzing 21cm HI-line and 12CO-line spectra of CTB 109, HII region Sh 152, and the adjacent molecular cloud complex. CTB 109 has been established to be interacting with a large molecular cloud (recession velocity at v=-55 km s^-1). The highest radial velocities of absorption features towards CTB 109 (-56 km s^-1) and Sh 152 (-65 km s^-1) are larger than the recombination line velocity (-50 km s^-1) of Sh 152 demonstrating the velocity reversal within the Perseus arm. The molecular cloud has cold HI column density large enough to produce HI self-absorption (HISA) and HI narrow self-absorption (HINSA) if it was at the near side of the velocity reversal. Absence of both HISA and HINSA indicates that the cloud is at the far side of the velocity reversal within the Perseus Arm, so we obtain a distance for CTB 109 of 4+/-0.8 kpc. The new distance still leads to a normal explosion energy for CTB 109/AXP 1E 2259+586.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:15:16 GMT" }, { "version": "v2", "created": "Mon, 8 Feb 2010 20:48:51 GMT" } ]
2010-02-08T00:00:00
[ [ "Tian", "Wenwu", "" ] ]
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711.2464
Gudrun Heinrich
G. Heinrich
Prompt photon production in photoproduction, DIS and hadronic collisions
10 pages, 12 figures, Talk given at the International Conference Photon 2007, Paris, July 2007, to appear in the proceedings
Nucl.Phys.Proc.Suppl.184:121-129,2008
10.1016/j.nuclphysbps.2008.09.149
Edinburgh 2007/41
hep-ph
null
Recent results on prompt photon production in photoproduction, deeply inelastic scattering and hadronic collisions are reviewed and the importance of photons for LHC experiments is briefly discussed.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:25:43 GMT" } ]
2008-12-18T00:00:00
[ [ "Heinrich", "G.", "" ] ]
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711.2465
Martijn Pistorius
Florin Avram, Zbigniew Palmowski, Martijn Pistorius
A two-dimensional ruin problem on the positive quadrant
2 figures, 19pp
null
null
null
math.PR
null
In this paper we study the joint ruin problem for two insurance companies that divide between them both claims and premia in some specified proportions (modeling two branches of the same insurance company or an insurance and re-insurance company). Modeling the risk processes of the insurance companies by Cram\'{e}r-Lundberg processes we obtain the Laplace transform in space of the probability that either of the insurance companies is ruined in finite time. Subsequently, for exponentially distributed claims, we derive an explicit analytical expression for this joint ruin probability by explicitly inverting this Laplace transform. We also provide a characterization of the Laplace transform of the joint ruin time.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:31:17 GMT" } ]
2007-11-16T00:00:00
[ [ "Avram", "Florin", "" ], [ "Palmowski", "Zbigniew", "" ], [ "Pistorius", "Martijn", "" ] ]
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711.2466
John Groves
C. J. B. Brookes and J. R. J. Groves
Representations of the quantum torus and applications to finitely presented groups
37 pages: some minor corrections and a reference to recent material
null
null
null
math.RT math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A structure theorem is proved for strongly holonomic modules over a quantum torus (a crossed product of a field with a free abelian group in which the field is central). This can be applied to give a structure theorem for finitely presented abelian-by-nilpotent groups.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:13:03 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 18:34:52 GMT" }, { "version": "v3", "created": "Mon, 5 Dec 2011 11:44:38 GMT" } ]
2011-12-06T00:00:00
[ [ "Brookes", "C. J. B.", "" ], [ "Groves", "J. R. J.", "" ] ]
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711.2467
Daniel Gomez Dumm
J. M. Cabarcas, D. Gomez Dumm, R. Martinez
Constraints on economical 331 models from mixing of K, Bd and Bs neutral mesons
11 pages, 3 figures. Eqs. (8) and (9) corrected, to be published in Phys. Rev. D
Phys.Rev.D77:036002,2008
10.1103/PhysRevD.77.036002
null
hep-ph
null
We analyze the effect of flavor changing neutral currents within 331 models. In particular, we concentrate in the so-called "economical" models, which have a minimal scalar sector. Taking into account the experimental measurements of observables related to neutral K and B meson mixing, we study the resulting bounds for angles and phases in the mixing matrix for the down quark sector, and the mass and mixing parameters related to the new Z' gauge boson.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:33:31 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 16:16:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Cabarcas", "J. M.", "" ], [ "Dumm", "D. Gomez", "" ], [ "Martinez", "R.", "" ] ]
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711.2468
Walter Becker w
Elaine W. Becker and Walter Becker
The automorphism groups of the groups of orders $16p$ and $16p^2$
56 pages
null
null
null
math.GR
null
Results of the computation of the automorphism groups for the groups of orders $16p$ and $16p^{2}$ are given. In some cases it has not been possible to give as complete a set of results as was done previously for the case of groups of order $8p^2$. Problems arise for those groups of the form ($C_{p} \times C_{p}$) @ $\G$[16] that occur in the orders $p\equiv 1$ mod(8) and $p\equiv 7$ mod(8), where $G$[16] means any group of order 16. The groups $G$[16] in question are $C_{16}$, $D_{8}$, $QD_{8}$, and $Q_{4}$. For the other cases, explicit presentations are presented for the automorphism groups of the groups of orders 16$p$ and 16$p^2$.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:33:45 GMT" } ]
2007-11-16T00:00:00
[ [ "Becker", "Elaine W.", "" ], [ "Becker", "Walter", "" ] ]
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711.2469
Barry Wardell
Adrian C. Ottewill and Barry Wardell
Quasi-local contribution to the scalar self-force: Geodesic Motion
Final Phys. Rev. D version. 24 pages, revtex4. Minor typos corrected
Phys.Rev.D77:104002,2008
10.1103/PhysRevD.77.104002
null
gr-qc
null
We consider a scalar charge travelling in a curved background spacetime. We calculate the quasi-local contribution to the scalar self-force experienced by such a particle following a geodesic in a general spacetime. We also show that if we assume a massless field and a vacuum background spacetime, the expression for the self-force simplifies significantly. We consider some specific cases whose gravitational analog are of immediate physical interest for the calculation of radiation reaction corrected orbits of binary black hole systems. These systems are expected to be detectable by the LISA space based gravitational wave observatory. We also investigate how alternate techniques may be employed in some specific cases and use these as a check on our own results.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:33:55 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 14:38:53 GMT" }, { "version": "v3", "created": "Mon, 5 May 2008 17:04:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Ottewill", "Adrian C.", "" ], [ "Wardell", "Barry", "" ] ]
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711.247
Pedro Vieira G.
Vladimir Kazakov, Pedro Vieira
From Characters to Quantum (Super)Spin Chains via Fusion
11 figures, references added
JHEP 0810:050,2008
10.1088/1126-6708/2008/10/050
null
hep-th math-ph math.MP math.QA nlin.SI
null
We give an elementary proof of the Bazhanov-Reshetikhin determinant formula for rational transfer matrices of the twisted quantum super-spin chains associated with the gl(K|M) algebra. This formula describes the most general fusion of transfer matrices in symmetric representations into arbitrary finite dimensional representations of the algebra and is at the heart of analytical Bethe ansatz approach. Our technique represents a systematic generalization of the usual Jacobi-Trudi formula for characters to its quantum analogue using certain group derivatives.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:44:03 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 07:12:34 GMT" } ]
2009-10-12T00:00:00
[ [ "Kazakov", "Vladimir", "" ], [ "Vieira", "Pedro", "" ] ]
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711.2471
Douglas Marshall
D.J. Marshall, R.Fux, A.C. Robin, and C. Reyle
The large scale dust lanes of the Galactic bar
4 pages, 5 figures, accepted for publication in Astronomy and Astrophysics letters
null
10.1051/0004-6361:20078967
null
astro-ph
null
(abridged) By comparing the distribution of dust and gas in the central regions of the Galaxy, we aim to obtain new insights into the properties of the offset dust lanes leading the bar's major axis in the Milky Way. On the one hand, the molecular emission of the dust lanes is extracted from the observed CO l-b-V distribution according to the interpretation of a dynamical model. On the other hand, a three dimensional extinction map of the Galactic central region constructed from near-infrared observations is used as a tracer of the dust itself and clearly reveals dust lanes in its face-on projection. Comparison of the position of both independent detections of the dust lanes is performed in the (l, b) plane. These two completely independent methods are used to provide a coherent picture of the dust lanes in the Milky Way bar. In both the gas and dust distributions, the dust lanes are found to be out of the Galactic plane, appearing at negative latitudes for l > 0 deg and at positive latitudes for l < 0 deg. However, even though there is substantial overlap between the two components, they are offset from one another with the dust appearing to lie closer to the b = 0 deg plane. Two scenarios are proposed to explain the observed offset. The first involves grain destruction by the bar shock and reformation downstream. Due to the decrease in velocity caused by the shock, this occurs at lower z. The second assumes that the gas and dust remain on a common tilted plane, but that the molecular gas decouples from the Milky Way's magnetic field, itself strong enough to resist the shear of the bar's shock. The diffuse gas and dust remain coupled to the field and are carried further downstream. This second scenario has recently been suggested in order to explain observations of the barred galaxy NGC 1097.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:56:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Marshall", "D. J.", "" ], [ "Fux", "R.", "" ], [ "Robin", "A. C.", "" ], [ "Reyle", "C.", "" ] ]
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711.2472
Federico Antinori
Federico Antinori
Strangeness, Charm and Beauty in Quark Matter: SQM 2007 Experimental Overview
Proceedings of Strangeness in Quark Matter 2007, submitted to Journal of Physics G
J.Phys.G35:044055,2008
10.1088/0954-3899/35/4/044055
null
nucl-ex
null
This paper aims at providing an experimental overview of the Strangeness in Quark Matter 2007 Conference
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:40:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Antinori", "Federico", "" ] ]
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711.2473
Robert Thorne S
A. Sherstnev and R.S. Thorne
Parton Distributions for LO Generators
40 pages, 29 figures as .ps or .eps files, the LO* pdf set is now available in LHAPDF
Eur.Phys.J.C55:553-575,2008
10.1140/epjc/s10052-008-0610-x
Cavendish-HEP-2007/12
hep-ph
null
We present a study of the results obtained combining LO partonic matrix elements with either LO or NLO partons distributions. These are compared to the best prediction using NLO for both matrix elements and parton distributions. The aim is to determine which parton distributions are most appropriate to use in those cases where only LO matrix elements are available, e.g. as in many Monte Carlo generators. Both LO and NLO parton distributions have flaws, sometimes serious, for some processes, so a modified optimal LO set is suggested. We investigate a wide variety of process, and the LO* pdf works at least as well as, and often better than, both LO and NLO pdfs in nearly all cases.The LO* pdf set is now available in the LHAPDF package.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:58:11 GMT" }, { "version": "v2", "created": "Thu, 15 Nov 2007 21:08:00 GMT" }, { "version": "v3", "created": "Wed, 4 Jun 2008 16:41:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Sherstnev", "A.", "" ], [ "Thorne", "R. S.", "" ] ]
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711.2474
Ivan Vakarchuk
Ivan Vakarchuk
Casimir effect in deformed field
12 pages, 1 figure
J.Phys.A41:185402,2008
10.1088/1751-8113/41/18/185402
null
quant-ph
null
The Casimir energy is calculated in one-, two-, and three-dimensional spaces for the field with generalized coordinates and momenta satisfying the deformed Poisson brackets leading to the minimal length.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 17:47:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Vakarchuk", "Ivan", "" ] ]
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711.2475
Abhijit Majumder
A. Majumder, R. J. Fries and B. M\"uller
Photon bremsstrahlung and diffusive broadening of a hard jet
24 pages, 3 figures, Revtex4
Phys.Rev.C77:065209,2008
10.1103/PhysRevC.77.065209
null
nucl-th hep-ph
null
The photon bremsstrahlung rate from a quark jet produced in deep-inelastic scattering (DIS) off a large nucleus is studied in the collinear limit. The leading medium-enhanced higher twist corrections which describe the multiple scattering of the jet in the nucleus are re-summed to all orders of twist. The propagation of the jet in the absence of further radiative energy loss is shown to be governed by a transverse momentum diffusion equation. We compute the final photon spectrum in the limit of soft photons, taking into account the leading and next-to-leading terms in the photon momentum fraction y. In this limit, the photon spectrum in a physical gauge is shown to arise from two interfering sources: one where the initial hard scattering produces an off-shell quark which immediately radiates the photon and then undergoes subsequent soft re-scattering; alternatively the quark is produced on-shell and propagates through the medium until it is driven off-shell by re-scattering and radiates the photon. Our result has a simple formal structure as a product of the photon splitting function, the quark transverse momentum distribution coming from a diffusion equation and a dimensionless factor which encodes the effect of the interferences encountered by the propagating quark over the length of the medium. The destructive nature of such interferences in the small y limit are responsible for the origin of the Landau-Pomeranchuck-Migdal (LPM) effect. Along the way we also discuss possible implications for quark jets in hot nuclear matter.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:14:56 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 16:54:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Majumder", "A.", "" ], [ "Fries", "R. J.", "" ], [ "Müller", "B.", "" ] ]
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711.2476
Liviu Chioncel
L. Chioncel, Y. Sakuraba, E. Arrigoni, M.I. Katsnelson, M. Oogane, Y. Ando, T. Miyazaki, E. Burzo, A.I. Lichtenstein
Non-quasiparticle states in Co$_2$MnSi evidenced through magnetic tunnel junction spectroscopy measurements
Repalced Fig. 1. of PRL, 100, 086402 (2008), better k-space resolution for DOS around Fermi energy
null
10.1103/PhysRevLett.100.086402
null
cond-mat.str-el cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the effects of electronic correlations in the full-Heusler Co$_2$MnSi, by combining a theoretical analysis of the spin-resolved density of states with tunneling-conductance spectroscopy measurements using Co$_2$MnSi as electrode. Both experimental and theoretical results confirm the existence of so-called non-quasiparticle states and their crucial contribution to the finite-temperature spin polarisation in this material.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:15:38 GMT" }, { "version": "v2", "created": "Wed, 23 Jul 2008 11:50:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Chioncel", "L.", "" ], [ "Sakuraba", "Y.", "" ], [ "Arrigoni", "E.", "" ], [ "Katsnelson", "M. I.", "" ], [ "Oogane", "M.", "" ], [ "Ando", "Y.", "" ], [ "Miyazaki", "T.", "" ], [ "Burzo", "E.", "" ], [ "Lichtenstein", "A. I.", "" ] ]
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711.2477
Samuel Carliles
Samuel Carliles, Tam\'as Budav\'ari, Sebastien Heinis, Carey Priebe, Alexander Szalay
Photometric Redshift Estimation on SDSS Data Using Random Forests
4 pages, 4 figures, to be published in Proceedings of ADASS XVII
null
null
null
astro-ph
null
Given multiband photometric data from the SDSS DR6, we estimate galaxy redshifts. We employ a Random Forest trained on color features and spectroscopic redshifts from 80,000 randomly chosen primary galaxies yielding a mapping from color to redshift such that the difference between the estimate and the spectroscopic redshift is small. Our methodology results in tight RMS scatter in the estimates limited by photometric errors. Additionally, this approach yields an error distribution that is nearly Gaussian with parameter estimates giving reliable confidence intervals unique to each galaxy photometric redshift.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:27:52 GMT" } ]
2007-11-16T00:00:00
[ [ "Carliles", "Samuel", "" ], [ "Budavári", "Tamás", "" ], [ "Heinis", "Sebastien", "" ], [ "Priebe", "Carey", "" ], [ "Szalay", "Alexander", "" ] ]
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711.2478
Vasileios Barmpoutis
Vasileios Barmpoutis, Gary F. Dargush
A Compact Self-organizing Cellular Automata-based Genetic Algorithm
24 pages, 18 figures, Submitted to Evolutionary Computation
null
null
null
cs.NE cs.AI
null
A Genetic Algorithm (GA) is proposed in which each member of the population can change schemata only with its neighbors according to a rule. The rule methodology and the neighborhood structure employ elements from the Cellular Automata (CA) strategies. Each member of the GA population is assigned to a cell and crossover takes place only between adjacent cells, according to the predefined rule. Although combinations of CA and GA approaches have appeared previously, here we rely on the inherent self-organizing features of CA, rather than on parallelism. This conceptual shift directs us toward the evolution of compact populations containing only a handful of members. We find that the resulting algorithm can search the design space more efficiently than traditional GA strategies due to its ability to exploit mutations within this compact self-organizing population. Consequently, premature convergence is avoided and the final results often are more accurate. In order to reinforce the superior mutation capability, a re-initialization strategy also is implemented. Ten test functions and two benchmark structural engineering truss design problems are examined in order to demonstrate the performance of the method.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:19:39 GMT" } ]
2007-11-16T00:00:00
[ [ "Barmpoutis", "Vasileios", "" ], [ "Dargush", "Gary F.", "" ] ]
[ 0.0730464906, 0.0578780845, 0.1032279953, 0.0326664336, -0.0578263178, -0.0297932364, 0.0322005078, -0.1265241802, -0.0318122394, 0.0298967753, 0.0884219781, -0.1623485535, 0.0088719651, 0.0181710273, 0.0677660257, -0.0606218576, 0.0769809559, -0.0477313027, 0.062433783, -0.038749326, 0.0118357576, -0.0433826782, 0.0725288019, 0.0454534516, -0.0412601382, -0.0577745475, 0.0685425624, 0.099086456, -0.0387234427, -0.1204154119, 0.0198535286, -0.0122110853, -0.0777057335, -0.0890432075, -0.0840215832, 0.1012089923, 0.0725288019, 0.0123081524, 0.0018345749, 0.1002253816, 0.0799318105, -0.0455311053, -0.0103409188, 0.1239357218, -0.0240856707, 0.0467218012, 0.0692155659, -0.0014301271, -0.0216525123, 0.0528305769, -0.0837627351, 0.0121334316, -0.0132011734, -0.0875419006, -0.0800871179, 0.0009083896, -0.0786893442, -0.038516365, -0.021328954, 0.049517341, 0.0122434413, -0.079258807, 0.0224937648, 0.0520540364, -0.0422178693, 0.0752208009, -0.0490255356, 0.0774468854, 0.0134859048, -0.0242927466, -0.0747031122, 0.019439375, 0.0463594161, -0.053218849, -0.0689049512, -0.0410530604, -0.0000584427, 0.0742889568, -0.1009501517, 0.0862994343, 0.0784305036, -0.0122628547, 0.0787411183, -0.049413804, 0.0222478602, -0.0946342945, -0.0344524756, -0.0270753484, -0.115549095, -0.0810707361, 0.007370655, 0.0691637918, -0.0234514959, 0.0233997274, 0.0626926273, 0.0210701078, 0.0940130651, 0.0109039107, 0.0954108313, 0.0276448093, 0.0612948611, -0.1166880205, 0.1681467146, 0.0198535286, 0.0827791244, -0.0728394166, -0.119794175, 0.1112004742, -0.0644010156, 0.029741466, -0.0827791244, -0.069940336, 0.0397329442, 0.0276965797, -0.058913473, 0.0005302309, 0.0154272532, -0.0362385139, 0.0334688574, 0.0350995883, 0.0148448488, 0.0086519457, -0.0289390422, -0.1162738651, 0.0780163482, -0.006325562, 0.0619678609, -0.0245127678, -0.1045740023, -0.0093637733, 0.0308803916, 0.0560661592, 0.0296120439, -0.0063352687, -0.1177234054, -0.0898197442, -0.086610049, 0.0275671557, -0.0468771085, 0.0251339991, 0.038386941, 0.03126866, -0.0127805481, -0.0107227173, -0.0310874693, -0.0148060219, -0.0326146632, 0.0634691715, -0.058913473, 0.1017266884, 0.0221443214, -0.0400176756, 0.0284213498, -0.0524681918, -0.0403800607, -0.1218649521, -0.1202083305, 0.1130641699, -0.0379986726, -0.028317811, 0.0477054156, 0.0308027379, 0.0662647113, 0.1068518534, -0.0311910082, -0.0013686511, -0.1128570884, 0.033287663, -0.0874901265, 0.0371962488, 0.0043745064, -0.1851270348, -0.0946860611, 0.0086907726, -0.0456087589, -0.0451687202, -0.0608807057, -0.1342895776, -0.078585811, -0.0613466278, -0.0203194525, 0.0391634814, 0.0383351706, -0.0052481135, -0.0394223258, -0.0610877834, 0.1389488131, -0.0505527295, -0.0855746642, -0.0183004495, 0.0256516915, -0.0296896975, 0.086402975, 0.0058531673, 0.0230761692, -0.0582404695, 0.1239357218, -0.0131752882, 0.0737712607, -0.0181451421, 0.0088396091, -0.0767221153, 0.0073771263, -0.0314498544, -0.0418813676, -0.0928741395, -0.0011526759, 0.0424508303, 0.0483784191, -0.0049019065, 0.0375586338, -0.0661611781, 0.0223513991, 0.0237362273, 0.00442304, -0.0375845172, 0.0050539784, 0.0889914408, 0.0514586903, 0.055082541, -0.0949449092, 0.0242927466, -0.002722742, -0.0003684519, -0.0354360901, -0.0744442642, 0.011557498, -0.0920458287, 0.0033585338, -0.077239804, 0.0616572462, 0.0056428546, -0.0660576373, -0.0597935505, -0.0120687196, -0.0233997274, 0.007170049, -0.0086260606, 0.0217042826, 0.0007870552, -0.027851887, 0.038386941, 0.0088525517, -0.0943236798, -0.0316051617, 0.0810707361, -0.1148243248, -0.0550307743, 0.0323040485, 0.0378433652, -0.0392670184, -0.0444698334, 0.0757902637, -0.0349960513, 0.0158931781, 0.091942288 ]
711.2479
Patrick Braganca
P. M. Braganca, O. Ozatay, A. G. F. Garcia, O. J. Lee, D. C. Ralph, and R. A. Buhrman
Enhancement in spin-torque efficiency by nonuniform spin current generated within a tapered nanopillar spin valve
22 pages, 5 figures, submitted to Phys. Rev. B
null
10.1103/PhysRevB.77.144423
null
cond-mat.other
null
We examine the effect a spatially non-uniform spin current with a component polarized partially out of the plane has on a low saturation magnetization nanomagnet free layer. Micromagnetic simulations indicate that the spin torque efficiency acting upon the reversing nanomagnet can be enhanced through this process, resulting in faster switching with smaller currents. In doing so, we determine that micromagnetic structure within the nanomagnets can be beneficial for reversal processes. We verify this enhancement experimentally in devices with a tapered nanopillar geometry that generates a spin current polarized partly out of plane. Finally, to take even better advantage of these effects, we examine micromagnetically the benefits of a tapered three-magnetic-layer structure that further reduces reversal times while maintaining the thermal stability of the free layer.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:29:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Braganca", "P. M.", "" ], [ "Ozatay", "O.", "" ], [ "Garcia", "A. G. F.", "" ], [ "Lee", "O. J.", "" ], [ "Ralph", "D. C.", "" ], [ "Buhrman", "R. A.", "" ] ]
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711.248
Erwin Platen
Erwin Platen, Rien van de Weygaert and Bernard J.T. Jones
Alignments of Voids in the Cosmic Web
10 pages, 4 figures, submitted to MNRAS, for high resolution version, see http://www.astro.rug.nl/~weygaert/tim1publication/voidshape.pdf
null
10.1111/j.1365-2966.2008.13019.x
null
astro-ph
null
We investigate the shapes and mutual alignment of voids in the large scale matter distribution of a LCDM cosmology simulation. The voids are identified using the novel WVF void finder technique. The identified voids are quite nonspherical and slightly prolate, with axis ratios in the order of c:b:a approx. 0.5:0.7:1. Their orientations are strongly correlated with significant alignments spanning scales >30 Mpc/h. We also find an intimate link between the cosmic tidal field and the void orientations. Over a very wide range of scales we find a coherent and strong alignment of the voids with the tidal field computed from the smoothed density distribution. This orientation-tide alignment remains significant on scales exceeding twice the typical void size, which shows that the long range external field is responsible for the alignment of the voids. This confirms the view that the large scale tidal force field is the main agent for the large scale spatial organization of the Cosmic Web.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:04:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Platen", "Erwin", "" ], [ "van de Weygaert", "Rien", "" ], [ "Jones", "Bernard J. T.", "" ] ]
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711.2481
Angela Osterman
M. Angela Osterman, H. Richard Miller, Kevin Marshall, Wesley T. Ryle, Hugh Aller, Margo Aller, and John P. McFarland
New Multiwavelength Observations of PKS 2155-304 and Implications for the Coordinated Variability Patterns of Blazars
23 pages, 8 figures, to be published in the Astrophysical Journal, volume 671
null
10.1086/522881
null
astro-ph
null
The TeV blazar PKS 2155--304 was the subject of an intensive 2 week optical and near-infrared observing campaign in 2004 August with the CTIO 0.9m telescope. During this time, simultaneous X-ray data from RXTE were also obtained. We compare the results of our observations to the results from two previous simultaneous multiwavelength campaigns on PKS 2155-304. We conclude that the correlation between the X-ray and UV/optical variability is strongest and the time lag is shortest (only a few hours) when the object is brightest. As the object becomes fainter, the correlations are weaker and the lags longer, increasing to a few days. Based on the results of four campaigns, we find evidence for a linear relationship between the mean optical brightness and lag time of X-ray and UV/optical events. Furthermore, we assert that this behavior, along with the different multiwavelength flare lag times across different flux states is consistent with a highly relativistic shock propagating down the jet producing the flares observed during a high state. In a quiescent state, the variability is likely to be due to a number of factors including both the jet and contributions outside of the jet, such as the accretion disk.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 18:56:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Osterman", "M. Angela", "" ], [ "Miller", "H. Richard", "" ], [ "Marshall", "Kevin", "" ], [ "Ryle", "Wesley T.", "" ], [ "Aller", "Hugh", "" ], [ "Aller", "Margo", "" ], [ "McFarland", "John P.", "" ] ]
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711.2482
Pedro Orellana
L. Rosales, M.Pacheco, Z. Barticevic, A. Latge, and P. A. Orellana
Transport modulation of graphene nanoribbons with side-attached organic molecules
5 pages, 7 figures
null
10.1088/0957-4484/19/6/065402
null
cond-mat.mes-hall
null
In this work we address the effects on the conductance of graphene nanoribbons (GNRs) at which organic molecules are side-attached on the ribbon ends. For simplicity, only armchair (AGNRs) and zigzag (ZGNRs) nanoribbons are considered and quasi one-dimensional molecules, such as linear poly-aromatic hydrocarbon (LPHC) and poly(para-phenylene), are chosen. The conductance of the GNRs exhibit a particular behavior as a function of the length of the organic molecules: the energy spectrum of the quasi one-dimensional system is clearly reflected in the conductance curves of the GNRs. The results suggest that GNRs can be used as an spectrograph-sensor device. An even-odd parity effect, as a function of the length of the attached molecules, can be observed in the conductance of these system. The nanostructures are described using a single-band tight binding Hamiltonian and the electronic conductance and the density of states of the systems are calculated within the Green's function formalism based on real-space renormalization techniques.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:03:17 GMT" }, { "version": "v2", "created": "Thu, 15 Nov 2007 22:06:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Rosales", "L.", "" ], [ "Pacheco", "M.", "" ], [ "Barticevic", "Z.", "" ], [ "Latge", "A.", "" ], [ "Orellana", "P. A.", "" ] ]
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711.2483
Shengjun Yuan
S. Yuan, M. I. Katsnelson, H. De Raedt
Decoherence by a spin thermal bath: Role of the spin-spin interactions
null
Phys. Rev. B 77, 184301 (2008)
10.1103/PhysRevB.77.184301
null
quant-ph
null
We study the decoherence of two coupled spins that interact with a spin-bath environment. It is shown that the connectivity and the coupling strength between the spins in the environment are of crucial importance for the decoherence of the central system. Changing the connectivity or coupling strenghts changes the decoherence of the central system from Gaussian to exponential decay law.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:05:59 GMT" } ]
2011-01-14T00:00:00
[ [ "Yuan", "S.", "" ], [ "Katsnelson", "M. I.", "" ], [ "De Raedt", "H.", "" ] ]
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711.2484
Thomas B. Schlumprecht
P. G. Casazza, S. J. Dilworth, E. Odell, Th.Schlumprecht, and Andras Zsak
Coefficient Quantization for Frames in Banach Spaces
33 pages
J.Math.Anal.Appl 348 (2008) 66-86
10.1016/j.jmaa.2008.06.055
null
math.FA math.MG
null
Let $(e_i)$ be a fundamental system of a Banach space. We consider the problem of approximating linear combinations of elements of this system by linear combinations using quantized coefficients. We will concentrate on systems which are possibly redundant. Our model for this situation will be frames in Banach spaces.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:06:29 GMT" } ]
2015-05-13T00:00:00
[ [ "Casazza", "P. G.", "" ], [ "Dilworth", "S. J.", "" ], [ "Odell", "E.", "" ], [ "Schlumprecht", "Th.", "" ], [ "Zsak", "Andras", "" ] ]
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711.2485
S. M. Iftiquar Dr
S. M. Iftiquar
Sub-natural width of transparency window in 85Rb vapor with D2 transition,
2 pages, 2 figures
null
null
null
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study 85Rb atomic vapor for electromagnetically induced transparency (EIT) and obtain sub-natural EIT spectra at optical power higher than saturation intensity. It is shown that spectral width of transmission and intensity of EIT signal increases with intensity of optical field, which is one of the desirable features for slow light and quantum information processing. A details analysis has been done on such an atomic system.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:09:44 GMT" }, { "version": "v2", "created": "Thu, 20 Jan 2011 06:40:12 GMT" } ]
2011-01-21T00:00:00
[ [ "Iftiquar", "S. M.", "" ] ]
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711.2486
Jean-Francois Boujut
Onur Hisarciklilar (LGS), Jean-Fran\c{c}ois Boujut (LGS)
An annotation based approach to support design communication
null
Dans Proceedings of ICED'07 - International Conference on Engineering Design, Paris : France (2007)
null
null
cs.HC
null
The aim of this paper is to propose an approach based on the concept of annotation for supporting design communication. In this paper, we describe a co-operative design case study where we analyse some annotation practices, mainly focused on design minutes recorded during project reviews. We point out specific requirements concerning annotation needs. Based on these requirements, we propose an annotation model, inspired from the Speech Act Theory (SAT) to support communication in a 3D digital environment. We define two types of annotations in the engineering design context, locutionary and illocutionary annotations. The annotations we describe in this paper are materialised by a set of digital artefacts, which have a semantic dimension allowing express/record elements of technical justifications, traces of contradictory debates, etc. In this paper, we first clarify the semantic annotation concept, and we define general properties of annotations in the engineering design context, and the role of annotations in different design project situations. After the description of the case study, where we observe and analyse annotations usage during the design reviews and minute making, the last section is dedicated to present our approach. We then describe the SAT concept, and define the concept of annotation acts. We conclude with a description of basic annotation functionalities that are actually implemented in a software, based on our approach.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:22:16 GMT" } ]
2007-11-16T00:00:00
[ [ "Hisarciklilar", "Onur", "", "LGS" ], [ "Boujut", "Jean-François", "", "LGS" ] ]
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711.2487
Nicolas Rougemaille
Nicolas Rougemaille, Andreas K. Schmid
Self-organization and magnetic domain microstructure of Fe nanowire arrays
null
Journal of Applied Physics 99, 8 (2006) 08S502
null
null
cond-mat.mtrl-sci
null
Starting from essentially flat nanometer-thick Fe films, epitaxially grown at room temperature on W(110) surfaces, we used carefully tuned annealing schedules to produce periodic arrays of nanoscale ferromagnetic wires. The structural transition from continuous films to nanowire arrays is accompanied with an in-plane 90 degree rotation of the spontaneous magnetization. Using spin-polarized low-energy electron microscopy to map the local magnetization directions while annealing, we studied the role of the dewetting mechanism on the self-organization and magnetization reorientation processes.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:22:50 GMT" } ]
2007-11-16T00:00:00
[ [ "Rougemaille", "Nicolas", "" ], [ "Schmid", "Andreas K.", "" ] ]
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711.2488
Mario Sigalotti
Mario Sigalotti (IECN, Inria Lorraine / Iecn / Mmas), Jean-Claude Vivalda (INRIA Lorraine / Iecn / Mmas, Lmam)
Controllability properties of a class of systems modeling swimming microscopic organisms
null
null
null
null
math.OC
null
We consider a finite-dimensional model for the motion of microscopic organisms whose propulsion exploits the action of a layer of cilia covering its surface. The model couples Newton's laws driving the organism, considered as a rigid body, with Stokes equations governing the surrounding fluid. The action of the cilia is described by a set of controlled velocity fields on the surface of the organism. The first contribution of the paper is the proof that such a system is generically controllable when the space of controlled velocity fields is at least three-dimensional. We also provide a complete characterization of controllable systems in the case in which the organism has a spherical shape. Finally, we offer a complete picture of controllable and non-controllable systems under the additional hypothesis that the organism and the fluid have densities of the same order of magnitude.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:23:38 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 16:55:24 GMT" } ]
2009-09-29T00:00:00
[ [ "Sigalotti", "Mario", "", "IECN, Inria Lorraine / Iecn / Mmas" ], [ "Vivalda", "Jean-Claude", "", "INRIA Lorraine / Iecn / Mmas, Lmam" ] ]
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711.2489
Michel Grabisch
Pedro Miranda, Michel Grabisch (CES), Pedro Gil
Axiomatic structure of k-additive capacities
null
Mathematical Social Sciences (2005) 153-178
null
null
cs.DM
null
In this paper we deal with the problem of axiomatizing the preference relations modelled through Choquet integral with respect to a $k$-additive capacity, i.e. whose M\"obius transform vanishes for subsets of more than $k$ elements. Thus, $k$-additive capacities range from probability measures ($k=1$) to general capacities ($k=n$). The axiomatization is done in several steps, starting from symmetric 2-additive capacities, a case related to the Gini index, and finishing with general $k$-additive capacities. We put an emphasis on 2-additive capacities. Our axiomatization is done in the framework of social welfare, and complete previous results of Weymark, Gilboa and Ben Porath, and Gajdos.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:24:22 GMT" } ]
2007-11-16T00:00:00
[ [ "Miranda", "Pedro", "", "CES" ], [ "Grabisch", "Michel", "", "CES" ], [ "Gil", "Pedro", "" ] ]
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711.249
Michel Grabisch
Michel Grabisch (CES)
The M\"obius transform on symmetric ordered structures and its application to capacities on finite sets
null
Discrete Mathematics (2004) 17-34
null
null
cs.DM
null
Considering a linearly ordered set, we introduce its symmetric version, and endow it with two operations extending supremum and infimum, so as to obtain an algebraic structure close to a commutative ring. We show that imposing symmetry necessarily entails non associativity, hence computing rules are defined in order to deal with non associativity. We study in details computing rules, which we endow with a partial order. This permits to find solutions to the inversion formula underlying the M\"obius transform. Then we apply these results to the case of capacities, a notion from decision theory which corresponds, in the language of ordered sets, to order preserving mappings, preserving also top and bottom. In this case, the solution of the inversion formula is called the M\"obius transform of the capacity. Properties and examples of M\"obius transform of sup-preserving and inf-preserving capacities are given.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:25:12 GMT" } ]
2007-11-16T00:00:00
[ [ "Grabisch", "Michel", "", "CES" ] ]
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711.2491
Nicolas Rougemaille
Nicolas Rougemaille (NEEL), Farid El Gabaly, Roland Stumpf, Andreas K. Schmid, Konrad Th\"urmer, Norman C. Bartelt, Juan De La Figuera
Labyrinthine Island Growth during Pd/Ru(0001) Heteroepitaxy
null
Physical Review Letters 99, 10 (2007) 106101
10.1103/PhysRevLett.99.106101
null
cond-mat.mtrl-sci
null
Using low energy electron microscopy we observe that Pd deposited on Ru only attaches to small sections of the atomic step edges surrounding Pd islands. This causes a novel epitaxial growth mode in which islands advance in a snakelike motion, giving rise to labyrinthine patterns. Based on density functional theory together with scanning tunneling microscopy and low energy electron microscopy we propose that this growth mode is caused by a surface alloy forming around growing islands. This alloy gradually reduces step attachment rates, resulting in an instability that favors adatom attachment at fast advancing step sections.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:25:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Rougemaille", "Nicolas", "", "NEEL" ], [ "Gabaly", "Farid El", "" ], [ "Stumpf", "Roland", "" ], [ "Schmid", "Andreas K.", "" ], [ "Thürmer", "Konrad", "" ], [ "Bartelt", "Norman C.", "" ], [ "De La Figuera", "Juan", "" ] ]
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711.2492
Winston Roberts
W. Roberts, Muslema Pervin
Heavy Baryons in a Quark Model
Version published in International Journal of Modern Physics A
Int.J.Mod.Phys.A23:2817-2860,2008
10.1142/S0217751X08041219
JLAB-THY-07-751
nucl-th hep-ex hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A quark model is applied to the spectrum of baryons containing heavy quarks. The model gives masses for the known heavy baryons that are in agreement with experiment, but for the doubly-charmed baryon Cascade_{cc}, the model prediction is too heavy. Mixing between the Cascade_Q and Cascade_Q^\prime states is examined and is found to be small for the lowest lying states. In contrast with this, mixing between the Cascade_{bc} and Cascade_{bc}^\prime states is found to be large, and the implication of this mixing for properties of these states is briefly discussed. We also examine heavy-quark spin-symmetry multiplets, and find that many states in the model can be placed in such multiplets. We compare our predictions with those of a number of other authors.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:26:27 GMT" }, { "version": "v2", "created": "Wed, 3 Sep 2008 17:10:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Roberts", "W.", "" ], [ "Pervin", "Muslema", "" ] ]
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711.2493
Patrick Rinke
Michael Rieger, Jutta Rogal, and Karsten Reuter
Effect of surface nanostructure on temperature programmed reaction spectroscopy: First-principles kinetic Monte Carlo simulations of CO oxidation at RuO2(110)
4 pages including 3 figures; related publications can be found at http://www.fhi-berlin.mpg.de/th/th.html
null
10.1103/PhysRevLett.100.016105
null
cond-mat.mtrl-sci
null
Using the catalytic CO oxidation at RuO2(110) as a showcase, we employ first-principles kinetic Monte Carlo simulations to illustrate the intricate effects on temperature programmed reaction spectroscopy data brought about by the mere correlations between the locations of the active sites at a nanostructured surface. Even in the absence of lateral interactions, this nanostructure alone can cause inhomogeneities that cannot be grasped by prevalent mean-field data analysis procedures, which thus lead to wrong conclusions on the reactivity of the different surface species.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:26:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Rieger", "Michael", "" ], [ "Rogal", "Jutta", "" ], [ "Reuter", "Karsten", "" ] ]
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711.2494
Jing Xia Mr.
Jing Xia, Elizabeth Schemm, G. Deutscher, S.A. Kivelson, D. A. Bonn, W. N. Hardy, R. Liang, W. Siemons, G. Koster, M. M. Fejer, and A. Kapitulnik
Polar Kerr Effect Measurements of YBa2Cu3O6+x: Evidence for Broken Symmetry Near the Pseudogap Temperature
4 pages, 5 figures, submitting to PRL
Phys. Rev. Lett. 100, 127002 (2008)
10.1103/PhysRevLett.100.127002
null
cond-mat.supr-con
null
Polar Kerr effect in the high-Tc superconductor \YBCO was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed non-zero Kerr rotations of order $\sim 1 \mu$rad appearing near the pseudogap temperature $T^*$, and marking what appears to be a true phase transition. Anomalous magnetic behavior in magnetic-field training of the effect suggests that time reversal symmetry is already broken above room temperature.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:33:54 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 07:08:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Xia", "Jing", "" ], [ "Schemm", "Elizabeth", "" ], [ "Deutscher", "G.", "" ], [ "Kivelson", "S. A.", "" ], [ "Bonn", "D. A.", "" ], [ "Hardy", "W. N.", "" ], [ "Liang", "R.", "" ], [ "Siemons", "W.", "" ], [ "Koster", "G.", "" ], [ "Fejer", "M. M.", "" ], [ "Kapitulnik", "A.", "" ] ]
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711.2495
Hans Vernaeve
Hans Vernaeve
Weak homogeneity in generalized function algebras
20 pages; follow-up of arXiv:math/0611377
Math. Nachr. (2010) 283 (10): 1506-1522
null
null
math.FA
null
In this paper, weakly homogeneous generalized functions in the special Colombeau algebras are determined up to equality in the sense of generalized distributions. This yields characterizations that are formally similar to distribution theory. Further, we give several characterizations of equality in the sense of generalized distributions in these algebras.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:35:21 GMT" } ]
2014-04-01T00:00:00
[ [ "Vernaeve", "Hans", "" ] ]
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711.2496
Kei-ichi Nagai
Kei-ichi Nagai, Nils Christian, Karl Jansen, Beatrix Pollakowski
The two flavour Schwinger model: scaling of the scalar condensate
7 pages, 5 figures, contribution to Lattice 2007, Regensburg, Germany, 30 July - 4 August 2007
PoS LAT2007:270,2007
null
null
hep-lat
null
We investigate the continuum limit scaling of the scalar condensate in the $N_f=2$ Schwinger model on the lattice. We employ maximally twisted mass Wilson fermions and overlap fermions. We compute the scalar condensate by taking the trace of the propagator (direct method) and by utilizing the integrated Ward-Takahashi identity. While the scalar condensate comes out consistent using these two methods for a given kind of lattice fermions, we find --quite surprisingly-- large discrepancies for the scalar condensate between twisted mass and overlap fermions. These discrepancies are only resolved when using the point split current for twisted mass fermions.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 19:48:33 GMT" } ]
2009-07-30T00:00:00
[ [ "Nagai", "Kei-ichi", "" ], [ "Christian", "Nils", "" ], [ "Jansen", "Karl", "" ], [ "Pollakowski", "Beatrix", "" ] ]
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711.2497
Pankaj Mehta
Pankaj Mehta, Ranjan Mukhopadhyay, Ned S. Wingreen
Exponential sensitivity of noise-driven switching in genetic networks
5 pages, 3 figures
Physical Biology 5, 026005 (2008)
10.1088/1478-3975/5/2/026005
null
q-bio.MN cond-mat.stat-mech q-bio.CB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cells are known to utilize biochemical noise to probabilistically switch between distinct gene expression states. We demonstrate that such noise-driven switching is dominated by tails of probability distributions and is therefore exponentially sensitive to changes in physiological parameters such as transcription and translation rates. However, provided mRNA lifetimes are short, switching can still be accurately simulated using protein-only models of gene expression. Exponential sensitivity limits the robustness of noise-driven switching, suggesting cells may use other mechanisms in order to switch reliably.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:04:50 GMT" }, { "version": "v2", "created": "Tue, 2 Sep 2008 21:27:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Mehta", "Pankaj", "" ], [ "Mukhopadhyay", "Ranjan", "" ], [ "Wingreen", "Ned S.", "" ] ]
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711.2498
Rolando Gaitan Deveras RGD
Rolando Gaitan D
On the Coupling Problem of Higher Spin Fields in 2+1 Dimension
Doctoral thesis (june 2005), 102 pages, spanish
null
null
null
hep-th gr-qc
null
The coupling problem of higher spin fields with a non dynamical background is revisited, focussing our attention in 2+1 dimensional space-time. Starting with a suitable Lagrangian field formulation, we study causality and the conservation of local degrees of freedom in a theory with gravitational (no dynamical) interaction, verifying that this type of theories must be consistent only in some space-time (i.e., dS/AdS). On the other hand, we consider the gravitational field as a dynamical object coupled with material fields as sources, from the point of view of a Yang-Mills gauge formulation for gravity. There we found some constraints on the shape of material fields and we show that introduction of auxiliary fields coupled with gauge connection does eliminate those constraints. The model of a Yang-Mills gauge formulation for topological massive gravity with cosmological constant is briefly introduced and we show that its field equations are consistent with the well known cosmologically extended topological massive gravity of Deser at the torsionless limit.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:11:16 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 18:55:38 GMT" } ]
2007-11-16T00:00:00
[ [ "D", "Rolando Gaitan", "" ] ]
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711.2499
Alexander A. Chernitskii
Alexander A. Chernitskii
Electromagnetic wave-particle with spin and magnetic moment
4 pages, talk given at "XII Workshop on High Energy Spin Physics", DSPIN-07, Dubna, Russia, September 3-7, 2007
XII Advanced Research Workshop on High Energy Spin Physics (DSPIN-07) Proceedings, edited by A.V. Efremov and S.V. Goloskokov, JINR, Dubna, 2008, pp. 433-436.
null
null
hep-th
null
An axisymmetric static solution of a nonlinear electrodynamics is considered as a massive charged particle with spin and magnetic moment. A linearization of the nonlinear electrodynamics around the static solution is investigated. The appropriate problem for linear waves around the static solution is considered. This wave part of the particle solution is considered to provide the appropriate wave properties for the particle. It has been found that the right (experimentally proved) formula for frequency of this wave appears theoretically for the static solution with ring singularity.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:15:21 GMT" } ]
2009-01-17T00:00:00
[ [ "Chernitskii", "Alexander A.", "" ] ]
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711.25
Bruno El-Bennich
B. El-Bennich, A. Furman, R. Kaminski, L. Lesniak, B. Loiseau and B. Moussallam
Mesonic interactions and their contribution to strong phases in flavor physics
Talk given at MENU '07, Juelich, Germany, September 2007
ECONFC070910:219,2007
null
null
hep-ph nucl-th
null
We analyze the contributions of hadronic final-state interactions to the strong phases generated in the B -> Kpipi weak decays. To this end, we develop an alternative approach to the commonly employed isobar model based upon scalar and vector form factors for pion-pion and pion-kaon interactions.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:18:34 GMT" } ]
2008-11-26T00:00:00
[ [ "El-Bennich", "B.", "" ], [ "Furman", "A.", "" ], [ "Kaminski", "R.", "" ], [ "Lesniak", "L.", "" ], [ "Loiseau", "B.", "" ], [ "Moussallam", "B.", "" ] ]
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711.2501
Neri Merhav
Neri Merhav
Error Exponents of Erasure/List Decoding Revisited via Moments of Distance Enumerators
24 pages; submitted to the IEEE Transactions on Information Theory
null
10.1109/TIT.2008.929004
null
cs.IT math.IT
null
The analysis of random coding error exponents pertaining to erasure/list decoding, due to Forney, is revisited. Instead of using Jensen's inequality as well as some other inequalities in the derivation, we demonstrate that an exponentially tight analysis can be carried out by assessing the relevant moments of a certain distance enumerator. The resulting bound has the following advantages: (i) it is at least as tight as Forney's bound, (ii) under certain symmetry conditions associated with the channel and the random coding distribution, it is simpler than Forney's bound in the sense that it involves an optimization over one parameter only (rather than two), and (iii) in certain special cases, like the binary symmetric channel (BSC), the optimum value of this parameter can be found in closed form, and so, there is no need to conduct a numerical search. We have not found yet, however, a numerical example where this new bound is strictly better than Forney's bound. This may provide an additional evidence to support Forney's conjecture that his bound is tight for the average code. We believe that the technique we suggest in this paper can be useful in simplifying, and hopefully also improving, exponential error bounds in other problem settings as well.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:20:19 GMT" } ]
2016-11-17T00:00:00
[ [ "Merhav", "Neri", "" ] ]
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711.2502
Alessandro Berarducci
Alessandro Berarducci
Cohomology of groups in o-minimal structures: acyclicity of the infinitesimal subgroup
11 pages
null
null
null
math.LO math.AT
null
By recent work on some conjectures of Pillay, each definably compact group in a saturated o-minimal structure is an expansion of a compact Lie group by a torsion free normal divisible subgroup, called its infinitesimal subgroup. We show that the infinitesimal subgroup is cohomologically acyclic. This implies that the functorial correspondence between definably compact groups and Lie groups preserves the cohomology.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:26:02 GMT" } ]
2007-11-16T00:00:00
[ [ "Berarducci", "Alessandro", "" ] ]
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711.2503
Holger Rauhut
Goetz E. Pfander, Holger Rauhut
Sparsity in time-frequency representations
null
null
null
null
math.CA cs.IT math.IT
null
We consider signals and operators in finite dimension which have sparse time-frequency representations. As main result we show that an $S$-sparse Gabor representation in $\mathbb{C}^n$ with respect to a random unimodular window can be recovered by Basis Pursuit with high probability provided that $S\leq Cn/\log(n)$. Our results are applicable to the channel estimation problem in wireless communications and they establish the usefulness of a class of measurement matrices for compressive sensing.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:54:55 GMT" } ]
2007-11-16T00:00:00
[ [ "Pfander", "Goetz E.", "" ], [ "Rauhut", "Holger", "" ] ]
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711.2504
Charles R. Cowley
C. R. Cowley, S. Hubrig, and F. Castelli
Isotopic Anomalies in CP Stars: Helium, Mercury, Platinum, and Calcium
Review presented at the CP/Ap Workshop, Vienna, Austria in September 2007
Contrib.Astron.Obs.Skalnate Pleso 38:291-300,2008
null
null
astro-ph
null
We review the classical observational results for isotopic abundance variations for several elements in CP stars. We concentrate on the "newest" anomaly, in calcium. The cosmically very rare isotope, Ca-48 can rival and even dominate the more common, alpha nuclide, Ca-40. Relevant examples are found in the hot, non-magnetic HgMn stars, and the field horizontal-branch star, Feige 86. The calcium anomaly is also present in cool, magnetic stars, including the notorious HD 101065, Przybylski's star.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:32:16 GMT" } ]
2010-11-26T00:00:00
[ [ "Cowley", "C. R.", "" ], [ "Hubrig", "S.", "" ], [ "Castelli", "F.", "" ] ]
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711.2505
Marcos Huerta
Marcos Huerta, Christopher M. Johns-Krull, L. Prato, Patrick Hartigan, D. T. Jaffe
Star Spot Induced Radial Velocity Variability in LkCa 19
ApJ accepted, 27 pages, 12 figures, aastex
null
10.1086/526415
null
astro-ph
null
We describe a new radial velocity survey of T Tauri stars and present the first results. Our search is motivated by an interest in detecting massive young planets, as well as investigating the origin of the brown dwarf desert. As part of this survey, we discovered large-amplitude, periodic, radial velocity variations in the spectrum of the weak line T Tauri star LkCa 19. Using line bisector analysis and a new simulation of the effect of star spots on the photometric and radial velocity variability of T Tauri stars, we show that our measured radial velocities for LkCa19 are fully consistent with variations caused by the presence of large star spots on this rapidly rotating young star. These results illustrate the level of activity-induced radial velocity noise associated with at least some very young stars. This activity-induced noise will set lower limits on the mass of a companion detectable around LkCa 19, and similarly active young stars.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 20:36:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Huerta", "Marcos", "" ], [ "Johns-Krull", "Christopher M.", "" ], [ "Prato", "L.", "" ], [ "Hartigan", "Patrick", "" ], [ "Jaffe", "D. T.", "" ] ]
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711.2506
Tao Zhou
Tao Zhou, Luo-Luo Jiang, Ri-Qi Su, and Yi-Cheng Zhang
Effect of initial configuration on network-based recommendation
4 pages and 3 figures
EPL 81, 58004 (2008)
10.1209/0295-5075/81/58004
null
physics.soc-ph
null
In this paper, based on a weighted object network, we propose a recommendation algorithm, which is sensitive to the configuration of initial resource distribution. Even under the simplest case with binary resource, the current algorithm has remarkably higher accuracy than the widely applied global ranking method and collaborative filtering. Furthermore, we introduce a free parameter $\beta$ to regulate the initial configuration of resource. The numerical results indicate that decreasing the initial resource located on popular objects can further improve the algorithmic accuracy. More significantly, we argue that a better algorithm should simultaneously have higher accuracy and be more personal. According to a newly proposed measure about the degree of personalization, we demonstrate that a degree-dependent initial configuration can outperform the uniform case for both accuracy and personalization strength.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:50:29 GMT" } ]
2008-02-14T00:00:00
[ [ "Zhou", "Tao", "" ], [ "Jiang", "Luo-Luo", "" ], [ "Su", "Ri-Qi", "" ], [ "Zhang", "Yi-Cheng", "" ] ]
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711.2507
Yaozhong Hu
Yaozhong Hu, David Nualart, Xiaoming Song
A singular stochastic differential equation driven by fractional Brownian motion
null
null
null
null
math.PR
null
In this paper we study a singular stochastic differential equation driven by an additive fractional Brownian motion with Hurst parameter $H>\frac 12$. Under some assumptions on the drift, we show that there is a unique solution, which has moments of all orders. We also apply the techniques of Malliavin calculus to prove that the solution has an absolutely continuous law at any time $t>0$.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:45:45 GMT" } ]
2007-11-19T00:00:00
[ [ "Hu", "Yaozhong", "" ], [ "Nualart", "David", "" ], [ "Song", "Xiaoming", "" ] ]
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