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712.2379
Bob Holdom
B. Holdom
Gribov copies and anomalous scaling
14 pages, 2 figures, published version
Phys.Rev.D78:125030,2008
10.1103/PhysRevD.78.125030
null
hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nonperturbative and lattice methods indicate that Gribov copies modify the infrared behavior of gauge theories and cause a suppression of gluon propagation. We investigate whether this can be implemented in a modified perturbation theory. The minimal modification proceeds via a nonlocal generalization of the Fadeev-Popov ghost that automatically decouples from physical states. The expected scale invariance of the physics associated with Gribov copies leads to the emergence of a nontrivial infrared fixed point. For a range of a scaling exponent the gauge bosons exhibit unparticlelike behavior in the infrared. The confining regime of interest for QCD requires a larger scaling exponent, but then the severity of ghost dominance upsets naive power counting for the infrared scaling behavior of amplitudes.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:53:56 GMT" }, { "version": "v2", "created": "Wed, 14 May 2008 02:49:06 GMT" }, { "version": "v3", "created": "Mon, 5 Jan 2009 15:26:07 GMT" } ]
2009-01-16T00:00:00
[ [ "Holdom", "B.", "" ] ]
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712.238
Yang Xian
Y. Xian
A variational Jastrow coupled-cluster theory of quantum many-body systems
null
null
10.1103/PhysRevA.77.042103
null
cond-mat.str-el
null
We study many-body correlations in the ground states of a general quantum system of bosons or fermions by including an additional Jastrow function in our ecently proposed variational coupled-cluster method. Our approach combines the dvantages of state-dependent correlations in the coupled-cluster theory and of strong, short-ranged correlations of the Jastrow function. We apply a generalized linked-cluster expansion for the Jastrow wavefunction and provide detailed analysis for practical evaluation of Hamiltonian expectation value as an energy functional of the Jastrow function and the bare density-distribution functions introduced and calculated in our earlier publications; a simple, first-order energy functional is derived and detailed formulas for higher-order contributions are provided. Our energy functional does not suffer the divergence as in most coupled-cluster calculations when applying to Hamiltonians with hardcore potentials. We also discuss relations between our energy functional and the energy functionals from other theories.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:01:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Xian", "Y.", "" ] ]
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712.2381
Kent Slinker
Kent Slinker
A proof of Goldbach's conjecture that all even numbers greater than four are the sum of two primes
This paper is withdrawn
null
null
null
math.GM
null
In this paper I introduce a model which allows one to prove Goldbachs hypothesis. The model is produced by studying Goldbach partitions as displayed by an inverted mirror image of all the primes up to some even number equal to the last prime plus three. The bottom half of the model is then moved to the right in steps of two which exhibit the Goldbach partitions for the next even number. As long as the model contains all the primes up to the resulting even number minus three, then Goldbachs hypothesis can be proven if it can be shown that each move must produce a Goldbach partition until one reaches the next prime plus one. I show that this must be the case.
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2011-11-10T00:00:00
[ [ "Slinker", "Kent", "" ] ]
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712.2382
Eugene Zabrodin
Konrad Tywoniuk, Ionut Arsene, Larissa Bravina, Alexey Kaidalov, Eugene Zabrodin
Nuclear suppression at RHIC and LHC in Glauber-Gribov approach
SQM2007 proceedings, 6 pages
J.Phys.G35:044039,2008
10.1088/0954-3899/35/4/044039
null
hep-ph nucl-ex nucl-th
null
The approach to problem of nuclear shadowing based on Gribov Reggeon calculus is presented. Here the total cross section of $h A$ interaction is found in a parameter-free description, employing the new data on the gluon density of the Pomeron, measured with high precision at HERA, as input. The model is then applied for calculation of $J/\psi$ production in $d Au$ collisions at top RHIC energy. It is shown that the theoretical estimates are in a very good agreement with the PHENIX data, and further predictions for the $J/\psi$ suppression in $p Pb$ collisions at coming soon LHC are made.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:05:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Tywoniuk", "Konrad", "" ], [ "Arsene", "Ionut", "" ], [ "Bravina", "Larissa", "" ], [ "Kaidalov", "Alexey", "" ], [ "Zabrodin", "Eugene", "" ] ]
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712.2383
Gregorio Bernardi
Tevatron New Phenomena and Higgs Working group (TEVNPHWG) (for the CDF Collaboration and the D0 Collaboration)
Combined CDF and Dzero Upper Limits on Standard Model Higgs-Boson Production
Updated SM Higgs combination, compared to the combination presented at the Lepton-Photon-07 Conference, using latest CDF and D0 Higgs results
null
null
FERMILAB-PUB-07-656-E
hep-ex
null
We combine results from CDF and D0 searches for a standard model Higgs boson (H) in ppbar collisions at the Fermilab Tevatron at sqrt{s}=1.96 TeV. With 1.0-1.9 fb-1 of data collected at CDF, and 0.9-1.7 fb-1 at D0, the 95% C.L. upper limits on Higgs production are a factor of 6.2 (1.4) higher than the SM cross section for a Higgs mass of m_Higgs = 115 (160) GeV/c^2. Based on simulation, the median expected upper limit is 4.3 (1.9). These results extend significantly the individual limits of each experiment.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:10:25 GMT" } ]
2019-08-14T00:00:00
[ [ "Phenomena", "Tevatron New", "", "TEVNPHWG" ], [ "group", "Higgs Working", "", "TEVNPHWG" ] ]
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712.2384
G.Susinder Rajan
G. Susinder Rajan and B. Sundar Rajan
Multi-group ML Decodable Collocated and Distributed Space Time Block Codes
Revised version. Under consideration for publication in IEEE Transactions on Information Theory
null
null
null
cs.IT cs.DM math.IT math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, collocated and distributed space-time block codes (DSTBCs) which admit multi-group maximum likelihood (ML) decoding are studied. First the collocated case is considered and the problem of constructing space-time block codes (STBCs) which optimally tradeoff rate and ML decoding complexity is posed. Recently, sufficient conditions for multi-group ML decodability have been provided in the literature and codes meeting these sufficient conditions were called Clifford Unitary Weight (CUW) STBCs. An algebraic framework based on extended Clifford algebras is proposed to study CUW STBCs and using this framework, the optimal tradeoff between rate and ML decoding complexity of CUW STBCs is obtained for few specific cases. Code constructions meeting this tradeoff optimally are also provided. The paper then focuses on multi-group ML decodable DSTBCs for application in synchronous wireless relay networks and three constructions of four-group ML decodable DSTBCs are provided. Finally, the OFDM based Alamouti space-time coded scheme proposed by Li-Xia for a 2 relay asynchronous relay network is extended to a more general transmission scheme that can achieve full asynchronous cooperative diversity for arbitrary number of relays. It is then shown how differential encoding at the source can be combined with the proposed transmission scheme to arrive at a new transmission scheme that can achieve full cooperative diversity in asynchronous wireless relay networks with no channel information and also no timing error knowledge at the destination node. Four-group decodable DSTBCs applicable in the proposed OFDM based transmission scheme are also given.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:15:25 GMT" }, { "version": "v2", "created": "Sat, 22 Nov 2008 05:17:15 GMT" } ]
2008-11-24T00:00:00
[ [ "Rajan", "G. Susinder", "" ], [ "Rajan", "B. Sundar", "" ] ]
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712.2385
John Inglesfield
J.E. Inglesfield
Time-dependent embedding
31 pages, 13 figures
null
10.1088/0953-8984/20/9/095215
null
cond-mat.mtrl-sci
null
A method of solving the time-dependent Schr\"odinger equation is presented, in which a finite region of space is treated explicitly, with the boundary conditions for matching the wave-functions on to the rest of the system replaced by an embedding term added on to the Hamiltonian. This time-dependent embedding term is derived from the Fourier transform of the energy-dependent embedding potential, which embeds the time-independent Schr\"odinger equation. Results are presented for a one-dimensional model of an atom in a time-varying electric field, the surface excitation of this model atom at a jellium surface in an external electric field, and the surface excitation of a bulk state.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:19:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Inglesfield", "J. E.", "" ] ]
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712.2386
Iliya Karlin
E. Chiavazzo, I.V. Karlin, C.E. Frouzakis, K.B. Boulouchos
Method of invariant grid for model reduction of hydrogen combustion
Submitted to the 32nd International Symposium on Combustion
null
null
null
cond-mat.stat-mech
null
The Method of Invariant Grid (MIG) is a model reduction technique based on the concept of slow invariant manifold (SIM), which approximates the SIM by a set of nodes in the concentration space (invariant grid). In the present work, the MIG is applied to a realistic combustion system: An adiabatic constant volume reactor with H2-air at stoichiometric proportions. By considering the thermodynamic Lyapunov function of the detailed kinetic system, the notion of the quasi-equilibrium manifold (QEM) is adopted as an initial approximation to the SIM. One- and two-dimensional discrete approximations of the QEM (quasi-equilibrium grids) are constructed and refined via the MIG to obtain the corresponding invariant grids. The invariant grids are tabulated and used to integrate the reduced system. Excellent agreements between the reduced and detailed kinetics is demonstrated.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:25:17 GMT" } ]
2007-12-17T00:00:00
[ [ "Chiavazzo", "E.", "" ], [ "Karlin", "I. V.", "" ], [ "Frouzakis", "C. E.", "" ], [ "Boulouchos", "K. B.", "" ] ]
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712.2387
Max-K. von Renesse
Sebastian Andres, Max-K. von Renesse
Particle Approximation of the Wasserstein Diffusion
3 Figures
null
null
null
math.PR
null
We construct a system of interacting two-sided Bessel processes on the unit interval and show that the associated empirical measure process converges to the Wasserstein Diffusion, assuming that Markov uniqueness holds for the generating Wasserstein Dirichlet form. The proof is based on the variational convergence of an associated sequence of Dirichlet forms in the generalized Mosco sense of Kuwae and Shioya.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:25:50 GMT" } ]
2007-12-17T00:00:00
[ [ "Andres", "Sebastian", "" ], [ "von Renesse", "Max-K.", "" ] ]
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712.2388
Julie Staunton
P. R. Tulip, J. B. Staunton, S. Lowitzer, D. K\"odderitzsch and H. Ebert
Theory of electronic transport in random alloys with short-range order: Korringa-Kohn-Rostoker non-local coherent potential approximation
23 pages, 3 figures
null
10.1103/PhysRevB.77.165116
null
cond-mat.mtrl-sci cond-mat.dis-nn
null
We present an ab-initio formalism for the calculation of transport properties in compositionally disordered systems within the framework of the Korringa-Kohn-Rostoker non-local coherent potential approximation. Our formalism is based upon the single-particle Kubo-Greenwood linear response and provides a natural means of incorporating the effects of short-range order upon the transport properties. We demonstrate the efficacy of the formalism by examining the effects of short-range order and clustering upon the transport properties of disordered $AgPd$ and $CuZn$ alloys.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:28:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Tulip", "P. R.", "" ], [ "Staunton", "J. B.", "" ], [ "Lowitzer", "S.", "" ], [ "Ködderitzsch", "D.", "" ], [ "Ebert", "H.", "" ] ]
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712.2389
Guido Tack
Martin Mann and Guido Tack and Sebastian Will
Decomposition During Search for Propagation-Based Constraint Solvers
20 pages, 9 figures, 2 tables; longer, more detailed version
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe decomposition during search (DDS), an integration of And/Or tree search into propagation-based constraint solvers. The presented search algorithm dynamically decomposes sub-problems of a constraint satisfaction problem into independent partial problems, avoiding redundant work. The paper discusses how DDS interacts with key features that make propagation-based solvers successful: constraint propagation, especially for global constraints, and dynamic search heuristics. We have implemented DDS for the Gecode constraint programming library. Two applications, solution counting in graph coloring and protein structure prediction, exemplify the benefits of DDS in practice.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:08:26 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 13:00:11 GMT" } ]
2008-06-11T00:00:00
[ [ "Mann", "Martin", "" ], [ "Tack", "Guido", "" ], [ "Will", "Sebastian", "" ] ]
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712.239
Matthew Fayers
Matthew Fayers
General runner removal and the Mullineux map
40 pages
J. Algebra 322 (2009) 4331-4367
10.1016/j.jalgebra.2009.09.027
null
math.RT math.CO math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a new `runner removal theorem' for $q$-decomposition numbers of the level 1 Fock space of type $A^{(1)}_{e-1}$, generalising earlier theorems of James--Mathas and the author. By combining this with another theorem relating to the Mullineux map, we show that the problem of finding all $q$-decomposition numbers indexed by partitions of a given weight is a finite computation.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:44:11 GMT" }, { "version": "v2", "created": "Tue, 10 Jun 2008 13:07:45 GMT" }, { "version": "v3", "created": "Thu, 3 Jul 2008 18:36:15 GMT" }, { "version": "v4", "created": "Mon, 1 Dec 2008 10:05:36 GMT" }, { "version": "v5", "created": "Tue, 19 May 2009 13:55:42 GMT" }, { "version": "v6", "created": "Wed, 20 May 2009 09:46:14 GMT" }, { "version": "v7", "created": "Sat, 22 Aug 2009 20:31:17 GMT" }, { "version": "v8", "created": "Thu, 8 Oct 2009 14:05:22 GMT" } ]
2012-02-20T00:00:00
[ [ "Fayers", "Matthew", "" ] ]
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712.2391
Romano L. M. Corradi
R.L.M. Corradi, E.R. Rodr\'iguez-Flores, A. Mampaso, R. Greimel, K. Viironen, J.E. Drew, D.J. Lennon, J. Mikolajewska, L. Sabin, and J.L. Sokoloski
IPHAS and the symbiotic stars. I. Selection method and first discoveries
Accepted for publication on Astronomy and Astrophysics. 12 pages, 8 figures
null
10.1051/0004-6361:20078989
null
astro-ph
null
The study of symbiotic stars is essential to understand important aspects of stellar evolution in interacting binaries. Their observed population in the Galaxy is however poorly known, and is one to three orders of magnitudes smaller than the predicted population size. IPHAS, the INT Photometric Halpha survey of the Northern Galactic plane, gives us the opportunity to make a systematic, complete search for symbiotic stars in a magnitude-limited volume, and discover a significant number of new systems. A method of selecting candidate symbiotic stars by combining IPHAS and near-IR (2MASS) colours is presented. It allows us to distinguish symbiotic binaries from normal stars and most of the other types of Halpha emission line stars in the Galaxy. The only exception are T Tauri stars, which can however be recognized because of their concentration in star forming regions. Using these selection criteria, we discuss the classification of a list of 4338 IPHAS stars with Halpha in emission. 1500 to 2000 of them are likely to be Be stars. Among the remaining objects, 1183 fulfill our photometric constraints to be considered candidate symbiotic stars. The spectroscopic confirmation of three of these objects, which are the first new symbiotic stars discovered by IPHAS, proves the potential of the survey and selection method.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:04:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Corradi", "R. L. M.", "" ], [ "Rodríguez-Flores", "E. R.", "" ], [ "Mampaso", "A.", "" ], [ "Greimel", "R.", "" ], [ "Viironen", "K.", "" ], [ "Drew", "J. E.", "" ], [ "Lennon", "D. J.", "" ], [ "Mikolajewska", "J.", "" ], [ "Sabin", "L.", "" ], [ "Sokoloski", "J. L.", "" ] ]
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712.2392
A. J. Millis
A. Comanac, L de Medici, M. Capone and A. J. Millis
Optical conductivity and the correlation strength of high temperature copper-oxide superconductors
null
Nature Physics 4, 287-290 (2008)
10.1038/nphys883
null
cond-mat.str-el
null
High temperature copper-oxide-based superconductivity is obtained by adding carriers to insulating "parent compounds". It is widely believed the parent compounds are "Mott" insulators, in which the lack of conduction arises from anomalously strong electron-electron repulsion, and that the unusual properties of Mott insulators are responsible for high temperature superconductivity. This paper presents a comparison of optical conductivity measurements and theoretical calculations which challenges this belief. The analysis indicates that the correlation strength in the cuprates is not as strong as previously believed, that the materials are not properly regarded as Mott insulators, that antiferromagnetism is essential to obtain the insulating state and, by implication, that antiferromagnetism is essential to the properties of the doped metallic and superconducting state as well.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:03:31 GMT" } ]
2008-04-07T00:00:00
[ [ "Comanac", "A.", "" ], [ "de Medici", "L", "" ], [ "Capone", "M.", "" ], [ "Millis", "A. J.", "" ] ]
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712.2393
Jes\'us Nieto Mart\'inez Eslay
Jos\'e Mijares and Jes\'us Nieto
Local Ramsey theory. An abstract approach
11 pages
null
null
null
math.LO
null
It is shown that the known notion of selective coideal can be extended to a family $\mathcal{H}$ of subsets of $\mathcal{R}$, where $(\mathcal{R},\leq,r)$ is a topological Ramsey space in the sense of Todorcevic (see \cite{todo}). Then it is proven that, if $\mathcal{H}$ selective, the $\mathcal{H}$-Ramsey and $\mathcal{H}$-Baire subsets of $\mathcal{R}$ are equivalent. This extends the results of Farah in \cite{farah} for semiselective coideals of $\mathbb{N}$. Also, it is proven that the family of ${\cal H}$--Ramsey subsets of ${\cal R}$ is closed under the Souslin operation.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:03:46 GMT" } ]
2007-12-17T00:00:00
[ [ "Mijares", "José", "" ], [ "Nieto", "Jesús", "" ] ]
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712.2394
Tiago Barreiro
T. Barreiro, B. de Carlos, E. J. Copeland and N. J. Nunes
Moduli evolution in the presence of thermal corrections
7 pages, 5 figures. Added content, version to appear in Phys. Rev. D
Phys.Rev.D78:063502,2008
10.1103/PhysRevD.78.063502
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of thermal corrections on the evolution of moduli in effective Supergravity models. This is motivated by previous results in the literature suggesting that these corrections could alter and, even, erase the presence of a minimum in the zero temperature potential, something that would have disastrous consequences in these particular models. We show that, in a representative sample of flux compactification constructions, this need not be the case, although we find that the inclusion of thermal corrections can dramatically decrease the region of initial conditions for which the moduli are stabilised. Moreover, the bounds on the reheating temperature coming from demanding that the full, finite temperature potential, has a minimum can be considerably relaxed given the slow pace at which the evolution proceeds.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:04:06 GMT" }, { "version": "v2", "created": "Tue, 23 Sep 2008 15:50:23 GMT" } ]
2009-02-20T00:00:00
[ [ "Barreiro", "T.", "" ], [ "de Carlos", "B.", "" ], [ "Copeland", "E. J.", "" ], [ "Nunes", "N. J.", "" ] ]
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712.2395
Keiichi Ohnaka
Keiichi Ohnaka and David A. Boboltz
Imaging the oxygen-rich disk toward the silicate carbon star EU And
6 pages, 4 figures, accepted for publication in A&A
null
10.1051/0004-6361:20079030
null
astro-ph
null
We present multi-epoch high-angular resolution observations of 22 GHz H2O masers toward the silicate carbon star EU And to probe the spatio-kinematic distribution of oxygen-rich material. EU And was observed at three epochs (maximum time interval of 14 months) with the Very Long Baseline Array (VLBA). Our VLBA observations of the 22 GHz H2O masers have revealed that the maser spots are distributed along a straight line across ~20 mas, with a slight hint of an S-shaped structure. The observed spectra show three prominent velocity components at V_LSR = -42, -38, and -34 km s^-1, with the masers in SW redshifted and those in NE blueshifted. The maser spots located in the middle of the overall distribution correspond to the component at V_LSR = -38 km s^-1, which approximately coincides with the systemic velocity. These observations can be interpreted as either an emerging helical jet or a disk viewed almost edge-on (a circumbinary or circum-companion disk). However, the outward motion measured in the VLBA images taken 14 months apart is much smaller than that expected from the jet scenario. Furthermore, the mid-infrared spectrum obtained with the Spitzer Space Telescope indicates that the 10 micron silicate emission is optically thin and the silicate grains are of sub-micron size. This lends support to the presence of a circum-companion disk, because an optically thin circumbinary disk consisting of such small grains would be blown away by the intense radiation pressure of the primary (carbon-rich) star. If we assume Keplerian rotation for the circum-companion disk, the mass of the companion is estimated to be 0.5--0.8 M_sun. We also identify CO2 emission features at 13--16 micron in the Spitzer spectrum of EU And--the first unambiguous detection of CO2 in silicate carbon stars.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:05:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Ohnaka", "Keiichi", "" ], [ "Boboltz", "David A.", "" ] ]
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712.2396
Fernando de Felice
D. Bini, F. de Felice and A. Geralico
Strains and Jets in Black Hole Fields
To appear in the Proceedings of the Spanish Relativity Meeting 2007 held in Tenerife (Spain) 3 Figures
null
10.1051/eas:0830011
null
gr-qc
null
We study the behaviour of an initially spherical bunch of particles emitted along trajectories parallel to the symmetry axis of a Kerr black hole. We show that, under suitable conditions, curvature and inertial strains compete to generate jet-like structures.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:16:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Bini", "D.", "" ], [ "de Felice", "F.", "" ], [ "Geralico", "A.", "" ] ]
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712.2397
Gavril Giurgiu
CDF Collaboration: T. Aaltonen, et al
First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in Bs -> J/psi phi Decays
7 pages, 2 figures, submitted to PRL
Phys.Rev.Lett.100:161802,2008
10.1103/PhysRevLett.100.161802
null
hep-ex
null
This Letter describes the first determination of bounds on the CP-violation parameter 2*beta_s using Bs decays in which the flavor of the bottom meson at production is identified. The result is based on approximately 2,000 Bs -> J/psi phi decays reconstructed in a 1.35 fb-1 data sample collected with the CDF II detector using p-bar p collisions produced at the Fermilab Tevatron. We report confidence regions in the two-dimensional space of 2*beta_s and the decay-width difference Delta-Gamma. Assuming the standard model predictions of 2*beta_s and Delta-Gamma, the probability of a deviation as large as the level of the observed data is 15%, corresponding to 1.5 Gaussian standard deviations. Dedicated to the memory of our dear friend and colleague, Michael P. Schmidt.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:20:25 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF Collaboration", "", "" ], [ "Aaltonen", "T.", "" ] ]
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712.2398
Antonio Trovato
Jayanth R. Banavar, Trinh X. Hoang, John H. Maddocks, Amos Maritan, Chiara Poletto, Andrzej Stasiak, Antonio Trovato
Structural motifs of biomolecules
13 pages, 5 figures
Proc. Natl. Acad. Sci. USA 104: 17283-17286 (2007)
10.1073/pnas.0704594104
null
q-bio.BM
null
Biomolecular structures are assemblies of emergent anisotropic building modules such as uniaxial helices or biaxial strands. We provide an approach to understanding a marginally compact phase of matter that is occupied by proteins and DNA. This phase, which is in some respects analogous to the liquid crystal phase for chain molecules, stabilizes a range of shapes that can be obtained by sequence-independent interactions occurring intra- and intermolecularly between polymeric molecules. We present a singularityfree self-interaction for a tube in the continuum limit and show that this results in the tube being positioned in the marginally compact phase. Our work provides a unified framework for understanding the building blocks of biomolecules.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:23:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Banavar", "Jayanth R.", "" ], [ "Hoang", "Trinh X.", "" ], [ "Maddocks", "John H.", "" ], [ "Maritan", "Amos", "" ], [ "Poletto", "Chiara", "" ], [ "Stasiak", "Andrzej", "" ], [ "Trovato", "Antonio", "" ] ]
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712.2399
Jouni A. Niskanen
J. A. Niskanen, T. M. Partanen, M. J. Iqbal
Parity nonconserving two-pion exchange in elastic proton-proton scattering
13 pages, 8 eps figures
Eur.Phys.J.A36:295-301,2008
10.1140/epja/i2007-10595-x
null
nucl-th
null
Parity nonconserving two-pion exchange in elastic pp scattering is investigated in the presence of phenomenological strong distortions in various models. Parity violation is included in the nucleon-pion vertex considering NN and N Delta(1232) intermediate states in box and crossed box diagrams. Using the derived parity nonconserving two-pion exchange potential we calculate the longitudinal analyzing power A_L in elastic $pp$ scattering. The predicted effect is of the same order as vector meson exchanges.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:31:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Niskanen", "J. A.", "" ], [ "Partanen", "T. M.", "" ], [ "Iqbal", "M. J.", "" ] ]
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712.24
Zoltan Kurucz
Z. Kurucz and M. Fleischhauer
Continuous variable versus EIT-based quantum memories
12 pages, 4 figures
Phys. Rev. A 78, 023805 (2008)
10.1103/PhysRevA.78.023805
null
quant-ph
null
We discuss a general model of a quantum memory for a single light mode in a collective mode of atomic oscillators. The model includes interaction Hamiltonians that are of second order in the canonical position and momentum operators of the light- and atomic oscillator modes. We also consider the possibility of measurement and feedback. We identify an interaction Hamiltonian that leads to an ideal mapping by pure unitary evolution and compare several schemes which realize this mapping using a common continuous-variable description. In particular we discuss schemes based on the off-resonant Faraday effect supplemented by measurement and feedback and proper preparation of the atoms in a squeezed state and schemes based on off-resonant Raman coupling as well as electromagnetically induced transparency (EIT).
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:50:12 GMT" } ]
2008-09-01T00:00:00
[ [ "Kurucz", "Z.", "" ], [ "Fleischhauer", "M.", "" ] ]
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712.2401
Jay Rosen
R. Bass, X. Chen and J. Rosen
Large Deviations for Riesz Potentials of Additive Processes
null
null
null
null
math.PR
null
We study functionals of the form \[\zeta_{t}=\int_0^{t}...\int_0^{t} | X_1(s_1)+...+ X_p(s_p)|^{-\sigma}ds_1... ds_p\] where $X_1(t),..., X_p(t)$ are i.i.d. $d$-dimensional symmetric stable processes of index $0<\bb\le 2$. We obtain results about the large deviations and laws of the iterated logarithm for $\zeta_{t}$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:35:01 GMT" } ]
2007-12-17T00:00:00
[ [ "Bass", "R.", "" ], [ "Chen", "X.", "" ], [ "Rosen", "J.", "" ] ]
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712.2402
James McLaughlin
J. A. McLaughlin, A. W. Hood
MHD mode coupling in the neighbourhood of a 2D null point
14 pages, 12 figures, 1 table
Astron.Astrophys.459:641-649,2006
10.1051/0004-6361:20065558
null
astro-ph
null
At this time there does not exist a robust set of rules connecting low and high $\beta$ waves across the $\beta \approx 1$ layer. The work here contributes specifically to what happens when a low $\beta$ fast wave crosses the $\beta \approx 1$ layer and transforms into high $\beta$ fast and slow waves. The nature of fast and slow magnetoacoustic waves is investigated in a finite $\beta$ plasma in the neighbourhood of a two-dimensional null point. The linearised equations are solved in both polar and cartesian forms with a two-step Lax-Wendroff numerical scheme. Analytical work (e.g. small $\beta$ expansion and WKB approximation) also complement the work. It is found that when a finite gas pressure is included in magnetic equilibrium containing an X-type null point, a fast wave is attracted towards the null by a refraction effect and that a slow wave is generated as the wave crosses the $\beta \approx 1$ layer. Current accumulation occurs close to the null and along nearby separatrices. The fast wave can now \emph{pass through the origin} due to the non-zero sound speed, an effect not previously seen in related papers but clear seen for larger values of $\beta$. Some of the energy can now leave the region of the null point and there is again generation of a slow wave component (we find that the fraction of the incident wave converted to a slow wave is proportional to $\beta$). We conclude that there are two competing phenomena; the refraction effect (due to the variable Alfv\'en speed) and the contribution from the non-zero sound speed. These experiments illustrate the importance of the magnetic topology and of the location of the $\beta \approx 1$ layer in the system.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:41:39 GMT" } ]
2008-11-26T00:00:00
[ [ "McLaughlin", "J. A.", "" ], [ "Hood", "A. W.", "" ] ]
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712.2403
Trueman MacHenry
Trueman MacHenry and Kieh Wong
Degree k Linear Recursions Mod(p)
28 pages, 3 figures
null
null
null
math.NT
null
Linear recursions of degree $k$ are determined by evaluating the sequence of Generalized Fibonacci Polynomials, $\{F_{k,n}(t_1,...,t_k)\}$ (isobaric reflects of the complete symmetric polynomials) at the integer vectors $(t_1,...,t_k)$. If $F_{k,n}(t_1,...,t_k) = f_n$, then $$f_n - \sum_{j=1}^k t_j f_{n-j} = 0,$$ and $\{f_n\}$ is a linear recursion of degree $k$. On the one hand, the periodic properties of such sequences modulo a prime $p$ are discussed, and are shown to be rela ted to the prime structure of certain algebraic number fields; for example, the arithmetic properties of the period ar e shown to characterize ramification of primes in an extension field. On the other hand, the structure of the semiloca l rings associated with the number field is shown to be completely determined by Schur-hook polynomials.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:43:03 GMT" } ]
2007-12-17T00:00:00
[ [ "MacHenry", "Trueman", "" ], [ "Wong", "Kieh", "" ] ]
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712.2404
Carles Rod\'o
Rodion Neigovzen, C. Rod\'o, Gerardo Adesso and A. Sanpera
Multipartite Continuous Variable Solution for the Byzantine Agreement Problem
This paper supersedes and extends arXiv:quant-ph/0507249, title changed to match the published version, 11 pages, 3 figures, published version
Phys. Rev. A 77, 062307 (2008)
10.1103/PhysRevA.77.062307
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate that the Byzantine Agreement (detectable broadcast) is also solvable in the continuous-variable scenario with multipartite entangled Gaussian states and Gaussian operations (homodyne detection). Within this scheme we find that Byzantine Agreement requires a minimum amount of entanglement in the multipartite states used in order to achieve a solution. We discuss realistic implementations of the protocol, which consider the possibility of having inefficient homodyne detectors, not perfectly correlated outcomes, and noise in the preparation of the resource states. The proposed protocol is proven to be robust and efficiently applicable under such non-ideal conditions.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:12:20 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 16:25:16 GMT" } ]
2008-06-09T00:00:00
[ [ "Neigovzen", "Rodion", "" ], [ "Rodó", "C.", "" ], [ "Adesso", "Gerardo", "" ], [ "Sanpera", "A.", "" ] ]
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712.2405
Elisabetta Moroni
E. Moroni, M. Caselle, F. Fogolari
Identification of DNA-binding protein target sequences by physical effective energy functions. Free energy analysis of lambda repressor-DNA complexes
35 pages,8 figures
BMC Structural Biology 2007, 7:61
10.1186/1472-6807-7-61
null
q-bio.BM q-bio.GN
null
Specific binding of proteins to DNA is one of the most common ways in which gene expression is controlled. Although general rules for the DNA-protein recognition can be derived, the ambiguous and complex nature of this mechanism precludes a simple recognition code, therefore the prediction of DNA target sequences is not straightforward. DNA-protein interactions can be studied using computational methods which can complement the current experimental methods and offer some advantages. In the present work we use physical effective potentials to evaluate the DNA-protein binding affinities for the lambda repressor-DNA complex for which structural and thermodynamic experimental data are available. The effect of conformational sampling by Molecular Dynamics simulations on the computed binding energy is assessed; results show that this effect is in general negative and the reproducibility of the experimental values decreases with the increase of simulation time considered. The free energy of binding for non-specific complexes agrees with earlier theoretical suggestions. Moreover, as a results of these analyses, we propose a protocol for the prediction of DNA-binding target sequences. The possibility of searching regulatory elements within the bacteriophage-lambda genome using this protocol is explored. Our analysis shows good prediction capabilities, even in the absence of any thermodynamic data and information on the naturally recognized sequence. This study supports the conclusion that physics-based methods can offer a completely complementary methodology to sequence-based methods for the identification of DNA-binding protein target sequences.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:45:07 GMT" } ]
2007-12-17T00:00:00
[ [ "Moroni", "E.", "" ], [ "Caselle", "M.", "" ], [ "Fogolari", "F.", "" ] ]
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712.2406
Ludovic Dan Lemle
Ludovic Dan Lemle, Liming Wu
Uniqueness of a pre-generator for $C_0$-semigroup on a general locally convex vector space
null
null
null
null
math.FA
null
The main purpose is to generalize a theorem of Arendt about uniqueness of $C_0$-semigroups from Banach space setting to the general locally convex vector spaces, more precisely, we show that cores are the only domains of uniqueness for $C_0$-semigroups on locally convex spaces. As an application, we find a necessary and sufficient condition for that the mass transport equation has one unique $L^1(\R^d,dx)$ weak solution.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:45:16 GMT" } ]
2007-12-17T00:00:00
[ [ "Lemle", "Ludovic Dan", "" ], [ "Wu", "Liming", "" ] ]
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712.2407
Xingbo Zhao
Xingbo Zhao, Ralf Rapp
Transverse Momentum Spectra of J/\psi in Heavy-Ion Collisions
7 pages, 6 figures; NA50 2000 data corrected in Fig.3 in v2; Implementation of leakage effect is corrected in v3, Numerical results for Cronin effect at RHIC are corrected in v3
Phys.Lett.B664:253-257,2008
10.1016/j.physletb.2008.03.068
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate J/\psi transverse-momentum (p_t) distributions and their centrality dependence in heavy-ion collisions at SPS and RHIC within the framework of a two-component model, which includes (i) primordial production coupled with various phases of dissociation, (ii) statistical coalescence of c and \bar{c} quarks at the hadronization transition. The suppression of the direct component (i) is calculated by solving a transport equation for J/\psi, \chi_c and \psi' in an expanding fireball using momentum dependent dissociation rates in the Quark-Gluon Plasma (QGP). The coalescence component is inferred from a kinetic rate equation with a momentum dependence following from a blast wave approach. At SPS energies, where the direct component dominates, the interplay of Cronin effect and QGP suppression results in fair agreement with NA50 p_t spectra. At RHIC energies, the p_t spectra in central Au+Au collisions are characterized by a transition from regeneration at low p_t to direct production above. At lower centralities, the latter dominates at all p_t.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:57:48 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 17:28:19 GMT" }, { "version": "v3", "created": "Mon, 9 Jun 2008 18:09:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Zhao", "Xingbo", "" ], [ "Rapp", "Ralf", "" ] ]
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712.2408
Pierre-Vincent Koseleff
Pierre-Vincent Koseleff (IMJ, UPMC Paris 6), Daniel Pecker (UPMC Paris 6)
A polynomial parametrization of torus knots
null
null
null
null
math.HO
null
For every odd integer $N$ we give an explicit construction of a polynomial curve $\cC(t) = (x(t), y (t))$, where $\deg x = 3$, $\deg y = N + 1 + 2\pent N4$ that has exactly $N$ crossing points $\cC(t_i)= \cC(s_i)$ whose parameters satisfy $s_1 < ... < s_{N} < t_1 < ... < t_{N}$. Our proof makes use of the theory of Stieltjes series and Pad\'e approximants. This allows us an explicit polynomial parametrization of the torus knot $K_{2,N}$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:51:56 GMT" } ]
2007-12-17T00:00:00
[ [ "Koseleff", "Pierre-Vincent", "", "IMJ, UPMC Paris 6" ], [ "Pecker", "Daniel", "", "UPMC Paris\n 6" ] ]
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712.2409
Oleg Ulyanov M.
V.F. Gopka (1), O.M. Ulyanov (2), S.M. Andrievsky (1)
On the possible nature of Bp-Ap Stars: an application to HD101065 and HR465
5 pages, 5 figures
null
null
null
astro-ph
null
We have proposed the new explanation of some magnetic chemically peculiar (MCP) stars anomalies, which is based on assumption that such stars can be the close binary systems with a secondary component being neutron star. Within this hypothesis one can naturally explain the main anomalous features of MCP stars: first of all, an existence of the short-lived radioactive isotopes detected in some stars (like Przybylski's star and HR465), and some others peculiarities (e.g. the behavior of CU Vir in radio range, the phenomenon of the roAp stars).
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:55:27 GMT" } ]
2007-12-17T00:00:00
[ [ "Gopka", "V. F.", "" ], [ "Ulyanov", "O. M.", "" ], [ "Andrievsky", "S. M.", "" ] ]
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712.241
Rose-Marie Galera
Nicolas Hadacek (NEEL), Alexandre Nossov, Laurent Ranno (NEEL), Pierre Strobel (NEEL), Rose-Marie Gal\'era (NEEL)
Magnetic properties of HO2 thin films
12
Journal of Physics Condensed Matter 19, 48 (2007) 486206
10.1088/0953-8984/19/48/486206
null
cond-mat.str-el
null
We report on the magnetic and transport studies of hafnium oxide thin films grown by pulsed-laser deposition on sapphire substrates under different oxygen pressures, ranging from 10-7 to 10-1 mbar. Some physical properties of these thin films appear to depend on the oxygen pressure during growth: the film grown at low oxygen pressure (P ~= 10-7 mbar) has a metallic aspect and is conducting, with a positive Hall signal, while those grown under higher oxygen pressures (7 x 10-5 <= P <= 0.4 mbar) are insulating. However, no intrinsic ferromagnetic signal could be attributed to the HfO2 films, irrespective of the oxygen pressure during the deposition.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:56:19 GMT" } ]
2007-12-17T00:00:00
[ [ "Hadacek", "Nicolas", "", "NEEL" ], [ "Nossov", "Alexandre", "", "NEEL" ], [ "Ranno", "Laurent", "", "NEEL" ], [ "Strobel", "Pierre", "", "NEEL" ], [ "Galéra", "Rose-Marie", "", "NEEL" ] ]
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712.2411
Ludovic Dan Lemle
Ludovic Dan Lemle (ICJ)
$L^\infty$-uniqueness of Schr\"odinger operators restricted in an open domain
null
null
null
null
math-ph math.MP
null
Consider the Schr\"odinger operator ${\cal A}=-\frac{\Delta}{2}+V$ acting on space $C_0^\infty(D)$, where $D$ is an open domain in $\R^d$. The main purpose of this paper is to present the $L^\infty(D,dx)$-uniqueness for Schr\"odinger operators which is equivalent to the $L^1(D,dx)$-uniqueness of weak solutions of the heat diffusion equation associated to the operator $\cal A$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:58:10 GMT" }, { "version": "v2", "created": "Sun, 9 Mar 2008 16:47:34 GMT" } ]
2008-03-10T00:00:00
[ [ "Lemle", "Ludovic Dan", "", "ICJ" ] ]
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712.2412
Simonetta Liuti
S. Ahmad, H. Honkanen, S. Liuti, S.K. Taneja
Generalized Parton Distributions and Hadronic Observables
Proceedings of Workshop on "Exclusive Reactions at High Momentum Transfer", May 21-24, 2007, Jefferson Lab, Newport News, VA USA
null
null
null
hep-ph
null
Following a previous detailed study of unpolarized generalized parton distribution functions in the non-singlet sector, and at zero values of the skewness variable, $\zeta$, we propose a physically motivated parametrization that is valid at $\zeta \neq 0$. Our method makes use of information from the nucleon form factor data, from deep inelastuc scattering parton distribution functions, and from lattice results on the Mellin moments of generalized parton distributions. It provides, therefore, a step towards a model independent extraction of generalized distributions from the data, alternative to the mathematical ansatz of double distributions. Comparisons with recent experimental data on the proton are shown.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 17:58:57 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 20:29:58 GMT" } ]
2007-12-18T00:00:00
[ [ "Ahmad", "S.", "" ], [ "Honkanen", "H.", "" ], [ "Liuti", "S.", "" ], [ "Taneja", "S. K.", "" ] ]
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712.2413
Jaeyoon Cho
Jaeyoon Cho, Dimitris G. Angelakis, and Sougato Bose
Heralded generation of entanglement with coupled cavities
null
Phys. Rev. A 78, 022323 (2008)
10.1103/PhysRevA.78.022323
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a scheme to generate two-photon, two-atom, or atom-photon entangledstates with a coupled system of two cavities. In our scheme, two cavity photonsare exchanged by the direct inter-cavity coupling, while atoms in the cavitiessimply play the role of generating and probing them. By virtue of the highefficiency of atomic state measurement, this method enables the realization ofefficient heralded entanglement generation robust against photon loss, whichgreatly facilitates applications in quantum information processing.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:02:40 GMT" }, { "version": "v2", "created": "Fri, 15 Aug 2008 14:50:25 GMT" } ]
2008-08-15T00:00:00
[ [ "Cho", "Jaeyoon", "" ], [ "Angelakis", "Dimitris G.", "" ], [ "Bose", "Sougato", "" ] ]
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712.2414
Mariusz Krawiec
Mariusz Krawiec
Compensation of the Kondo effect in quantum dots coupled to ferromagnetic leads within equation of motion approach
16 pages, 8 figures
J. Phys.: Condens. Matter 19, 346234 (2007)
10.1088/0953-8984/19/34/346234
null
cond-mat.mes-hall
null
We propose a new approximation scheme within equation of motion approach (EOM) to spin polarized transport through a quantum dot coupled to ferromagnetic leads. It has some advantages over a widely used in the literature standard EOM technique, in particular when we are interested in spin polarized quantities. Namely, it gives the values of the dot spin polarization which are closer to the ones obtained within numerical renormalization group (NRG), than the standard EOM approach. While restoring the Kondo effect, the spin polarization vanishes and the transport becomes unpolarized, in agreement with NRG and a real time diagrammatic calculations. The standard EOM procedure gives nonzero values of the spin polarization, and the transport is still spin polarized. Both approximations give the same correct splitting of the Kondo peaks due to ferromagnetism in the electrodes.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:02:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Krawiec", "Mariusz", "" ] ]
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712.2415
Fathi Namouni
Fathi Namouni, Massimiliano Guzzo, Elena Lega
On the integrability of stellar motion in an accelerated logarithmic potential
5 pages, 4 figures, revised version to appear in Astronomy and Astrophysics
null
10.1051/0004-6361:200810102
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An accelerated logarithmic potential models the mean motion of stars in a flat rotation curve galaxy that sustains a wind system. For stars outside the galactic wind launching region, the asymmetric removal of linear momentum by the wind is seen as a perturbing acceleration superimposed onto the galactic potential. We study the integrability of stellar motion in an accelerated logarithmic potential. We use surfaces of section of the dynamical system to probe the integrability of motion. We provide numerical evidence that motion in an accelerated logarithmic potential is non-integrable. Large scale chaotic diffusion occurs for lower values of the projected angular momentum along the direction of acceleration and persists at all values of the angular momentum in the outer part of the galaxy inside the truncation radius where the galactic acceleration balances the wind-induced acceleration.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:02:41 GMT" }, { "version": "v2", "created": "Thu, 24 Jul 2008 09:39:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Namouni", "Fathi", "" ], [ "Guzzo", "Massimiliano", "" ], [ "Lega", "Elena", "" ] ]
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712.2416
Yan Levin
Renato Pakter, Yan Levin, and Felipe B.Rizzato
Image Effects on the Transport of Intense Nonaxisymmetric Charged Beams
Accepted in Applied Phys. Lett
null
10.1063/1.2827580
null
physics.plasm-ph physics.acc-ph
null
The effect of conducting pipes on the equilibrium of intense nonaxisymmetric continuous beams of charged particles is investigated. For a cylindrical pipe and an elliptical beam, we obtain an exact closed form analytical expression for the electrostatic potential. Using a variational principle, we then explore the distortions that equilibrium beams suffer due to the conducting channel. Finally, we present an exact proof that despite the nonlinear forces acting on beams of arbitrary cross section inside conducting pipes of arbitrary shape, the density of these beams remains homogeneous and their cross sectional area remains the sa me as the one in free-space.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:11:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Pakter", "Renato", "" ], [ "Levin", "Yan", "" ], [ "Rizzato", "Felipe B.", "" ] ]
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712.2417
Simonetta Liuti
Simonetta Liuti, Saeed Ahmad, Gary R. Goldstein, Leonard Gamberg
$\pi^o$ Electroproduction and Transversity
Proceedings of XII International Conference on Hadron Spectroscopy, October 8-13, 2007, Laboratori Nazionali di Frascati (Rome) Italy
null
null
null
hep-ph
null
Exclusive $\pi^o$ electroproduction and related processes are suggested to investigate the chiral odd transversity distributions of quarks in the transversely polarized nucleon, $h_1(x)$, and its first moment, the tensor charge. The connection between a description based on partonic degrees of freedom, given in terms of generalized parton distributions, and Regge phenomenology is explored.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:08:58 GMT" } ]
2007-12-17T00:00:00
[ [ "Liuti", "Simonetta", "" ], [ "Ahmad", "Saeed", "" ], [ "Goldstein", "Gary R.", "" ], [ "Gamberg", "Leonard", "" ] ]
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712.2418
Richard Rimanyi
R. Marangell, R. Rimanyi
The general quadruple point formula
23 pages
null
null
null
math.AG
null
Maps between manifolds $M^m\to N^{m+\ell}$ ($\ell>0$) have multiple points, and more generally, multisingularities. The closure of the set of points where the map has a particular multisingularity is called the multisingularity locus. There are universal relations among the cohomology classes represented by multisingularity loci, and the characteristic classes of the manifolds. These relations include the celebrated Thom polynomials of monosingularities. For multisingularities, however, only the form of these relations is clear in general (due to Kazarian), the concrete polynomials occurring in the relations are much less known. In the present paper we prove the first general such relation outside the region of Morin-maps: the general quadruple point formula. We apply this formula in enumerative geometry by computing the number of 4-secant linear spaces to smooth projective varieties. Some other multisingularity formulas are also studied, namely 5, 6, 7 tuple point formulas, and one corresponding to $\Sigma^2\Sigma^0$ multisingularities.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:09:42 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 15:08:14 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 15:23:28 GMT" } ]
2008-01-30T00:00:00
[ [ "Marangell", "R.", "" ], [ "Rimanyi", "R.", "" ] ]
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712.2419
Michael Spira
M. Gomez-Bock, M. Mondrag\'on, M. M\"uhlleitner, M. Spira, P.M. Zerwas
Concepts of Electroweak Symmetry Breaking and Higgs Physics
124 pages, 36 figures, latex, english and spanish versions in succession
null
null
CERN-PH-TH/2007-262, DESY 07-214, LAPTH-CONF-1223/2007, LPT-ORSAY 07-128, PITHA 07/20, PSI-PR-07-11
hep-ph
null
We present an introduction to the basic concepts of electroweak symmetry breaking and Higgs physics within the Standard Model and its supersymmetric extensions. A brief overview will also be given on alternative mechanisms of electroweak symmetry breaking. In addition to the theoretical basis, the present experimental status of Higgs physics and prospects at the Tevatron, the LHC and e+e- linear colliders are discussed.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:58:36 GMT" } ]
2007-12-17T00:00:00
[ [ "Gomez-Bock", "M.", "" ], [ "Mondragón", "M.", "" ], [ "Mühlleitner", "M.", "" ], [ "Spira", "M.", "" ], [ "Zerwas", "P. M.", "" ] ]
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712.242
Camil Muscalu
Camil Muscalu, Terence Tao, Christoph Thiele
Multi-linear multipliers associated to simplexes of arbitrary length
52 pages, 6 figures
null
null
null
math.CA
null
In this article we prove that the $n$-linear operator whose symbol is the characteristic function of the simplex $\Delta_n = \xi_1 < ... < \xi_n$ is bounded from $L^2 \times ... \times L^2$ into $L^{2/n}$, generalizing in this way our previous work on the "bi-est" operator (which corresponds to the case $n=3$) as well as Lacey-Thiele theorem on the bi-linear Hilbert transform (which corresponds to the case $n=2$).
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:17:18 GMT" } ]
2007-12-17T00:00:00
[ [ "Muscalu", "Camil", "" ], [ "Tao", "Terence", "" ], [ "Thiele", "Christoph", "" ] ]
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712.2421
Fr\'ed\'eric Paletou
F. Paletou, M. Lafon, P. Maeght, F. Grimaud, T. Louge (OMP/LATT), J. Aboudarham (Observatoire de Paris, LESIA)
The ground-based solar observations database BASS 2000
3 pages, 1 figure (to appear in the Procs. of Solar Polarization Workshop #5, eds. Berdyugina, Nagendra and Ramelli)
null
null
null
astro-ph
null
BASS 2000 is the French solar database for ground-based instruments. We describe hereafter our organization, our tasks and the products we can deliver to the international community. Our prospects cover data mining into the THeMIS archive, a participation to the EST endeavour and the creation and curation of the ESPaDOnS/NARVAL stellar spectra database.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:28:01 GMT" } ]
2007-12-17T00:00:00
[ [ "Paletou", "F.", "", "OMP/LATT" ], [ "Lafon", "M.", "", "OMP/LATT" ], [ "Maeght", "P.", "", "OMP/LATT" ], [ "Grimaud", "F.", "", "OMP/LATT" ], [ "Louge", "T.", "", "OMP/LATT" ], [ "Aboudarham", "J.", "", "Observatoire de Paris, LESIA" ] ]
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712.2422
Mark Heinz
Mark Heinz (for the ALICE Collaboration)
Reconstructing Bottom mesons using displaced vertices from semi-leptonic decays
8 pages, Proceedings of Winter Workshop of Nuclear Dynamics 2007, Big Sky, MT
null
null
null
nucl-ex
null
Precise determination of heavy flavor production cross-sections at LHC energies will be of primary importance. The produced heavy quarks are expected to be sensitive probes of parton energy loss in the medium formed in heavy-ion collisions. Through the measurement of charm and bottom suppression in Pb + Pb with respect to p + p, we hope to obtain insight into the color-charge and quark mass dependence of the energy loss mechanism. The ALICE experiment with its large acceptance is well suited to investigate the intermediate transverse momentum spectrum of heavy flavor mesons where these energy loss effects are expected to be visible. ALICE has very good electron PID capabilities over a large kinematic range using Time Projection Chamber (TPC), Transition Radiation Detector (TRD) and the Electromagnetic Calorimeter (EMCal). In addition the EMCal, to be installed for the Pb + Pb runs, is planned to allow efficient triggering on high-pT jets. We first introduce the EMCal project and an overview of detector specifications. Then we introduce a method developed to select preferentially electrons from heavy flavor decays by reconstructing displaced secondary vertices. The strategy is to reconstruct displaced vertices from semi-leptonic heavy flavor meson decays using the excellent spatial resolution of the Inner Tracking System (ITS). We show preliminary results of an efficiency study from charm vs. bottom vertices.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:28:53 GMT" } ]
2019-08-13T00:00:00
[ [ "Heinz", "Mark", "", "for the ALICE Collaboration" ] ]
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712.2423
Nikolai Moshchevitin
Nikolay G. Moshchevitin
Towards BAD conjecture
Minor correction of errors in Lemma 2
null
null
null
math.NT
null
For $\alpha, \beta, \delta \in [0,1], \alpha +\beta = 1 $ we consider sets $$ {\rm BAD}^* (\alpha, \beta ;\delta) = \left\{\xi = (\xi_1,\xi_2) \in [0,1]^2: ,\inf_{p\in \mathbb{N}} \max \{(p\log(p+1))^\alpha ||p\xi_1||, (p\log (p+1))^\beta ||p\xi_2||\} \ge \delta \right\}. $$ We prove that for different $(\alpha_1,\beta_1), (\alpha_2,\beta_2), \alpha_1 +\beta_1 = \alpha_2 +\beta_2 = 1 $ and $\delta $ small enough $$ {\rm BAD}^* (\alpha_1, \beta_1 ;\delta) \bigcap {\rm BAD}^* (\alpha_2, \beta_2 ;\delta) \neq \varnothing . $$ Our result is based on A. Khintchine's construction and an original method due to Y. Peres and W. Schlag.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:53:55 GMT" }, { "version": "v2", "created": "Sat, 12 Apr 2008 13:44:03 GMT" } ]
2008-04-12T00:00:00
[ [ "Moshchevitin", "Nikolay G.", "" ] ]
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712.2424
Peter McNamara
Peter R. W. McNamara and Stephanie van Willigenburg
Positivity results on ribbon Schur function differences
20 pages, 5 figures. Minor expository changes. Final version, to appear in the European J. Combin.
European Journal of Combinatorics, 30 (5) (2009), 1352-1369
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is considerable current interest in determining when the difference of two skew Schur functions is Schur positive. We consider the posets that result from ordering skew diagrams according to Schur positivity, before focussing on the convex subposets corresponding to ribbons. While the general solution for ribbon Schur functions seems out of reach at present, we determine necessary and sufficient conditions for multiplicity-free ribbons, i.e. those whose expansion as a linear combination of Schur functions has all coefficients either zero or one. In particular, we show that the poset that results from ordering such ribbons according to Schur-positivity is essentially a product of two chains.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:45:45 GMT" }, { "version": "v2", "created": "Thu, 16 Oct 2008 22:33:00 GMT" } ]
2012-02-01T00:00:00
[ [ "McNamara", "Peter R. W.", "" ], [ "van Willigenburg", "Stephanie", "" ] ]
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712.2425
Henriette Elvang
Henriette Elvang and Maria J. Rodriguez
Bicycling Black Rings
32 pages, 12 figures
JHEP0804:045,2008
10.1088/1126-6708/2008/04/045
null
hep-th
null
We present detailed physics analyses of two different 4+1-dimensional asymptotically flat vacuum black hole solutions with spin in two independent planes: the doubly spinning black ring and the bicycling black ring system ("bi-rings"). The latter is a new solution describing two concentric orthogonal rotating black rings which we construct using the inverse scattering technique. We focus particularly on extremal zero-temperature limits of the solutions. We construct the phase diagram of currently known zero-temperature vacuum black hole solutions with a single event horizon, and discuss the non-uniqueness introduced by more exotic black hole configurations such as bi-rings and multi-ring saturns.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:47:15 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 22:52:21 GMT" }, { "version": "v3", "created": "Fri, 25 Jan 2008 15:56:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Elvang", "Henriette", "" ], [ "Rodriguez", "Maria J.", "" ] ]
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712.2426
Marianela Carubelli
Marianela Carubelli, Orlando V. Billoni, Santiago Pighin, Sergio A. Cannas, Daniel A. Stariolo, Francisco A. Tamarit
The Spin Reorientation Transition and Phase Diagram of Ultrathin Ferromagnetic Films
9 pages, 13 figures
PRB 77, 134417 (2008)
10.1103/PhysRevB.77.134417
null
cond-mat.dis-nn cond-mat.stat-mech
null
We show results from Monte Carlo simulations of a two dimensional Heisenberg model for ultrathin films with perpendicular anisotropy. A complete phase diagram is obtained as a function of anisotropy and temperature, spanning a wide range of behavior. We discuss our results in relation with experimental findings in different ultrathin films. We observe and characterize a line of Spin Reorientation Transitions . This transition from out of plane stripe order to in plane ferromagnetic order presents a paramagnetic gap in between in a finite region in parameter space, as reported in experiments. For large anisotropies direct transitions from a low temperature stripe phase to a paramagnetic or tetragonal phase with dominant perpendicular magnetization is observed, also in agreement with experiments. We also show the phase diagram for a system without exchange, i.e. with pure dipolar and anisotropy interactions. It shows a similar behavior to the ferromagnetic case with antiferromagnetic instead of stripe phases at low temperatures. A Spin Reorientation Transition is also found in this case.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:54:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Carubelli", "Marianela", "" ], [ "Billoni", "Orlando V.", "" ], [ "Pighin", "Santiago", "" ], [ "Cannas", "Sergio A.", "" ], [ "Stariolo", "Daniel A.", "" ], [ "Tamarit", "Francisco A.", "" ] ]
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712.2427
Aurelian Isar
Aurelian Isar
Quantum decoherence and classical correlations in open systems
11 pages, talk at the Workshop on Quantum-Classical Transition and Quantum Information, Benasque, Spain, 2006
null
null
null
quant-ph
null
In the framework of the Lindblad theory for open quantum systems we determine the degree of quantum decoherence and classical correlations of a harmonic oscillator interacting with a thermal bath. The transition from quantum to classical behaviour of the considered system is analyzed and it is shown that the classicality takes place during a finite interval of time. We calculate also the decoherence time and show that it has the same scale as the time after which thermal fluctuations become comparable with quantum fluctuations.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:48:57 GMT" } ]
2007-12-17T00:00:00
[ [ "Isar", "Aurelian", "" ] ]
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712.2428
George Lowther
George Lowther
Limits Of One Dimensional Diffusions
32 pages. Updated to most recent version submitted to Annals of Probability
Ann. Probab. Volume 37, Number 1 (2009), 78-106
10.1214/08-AOP397
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we look at the properties of limits of a sequence of real valued time inhomogeneous diffusions. When convergence is only in the sense of finite-dimensional distributions then the limit does not have to be a diffusion. However, we show that as long as the drift terms satisfy a Lipschitz condition and the limit is continuous in probability, then it will lie in a class of processes that we refer to as almost-continuous diffusions. These processes are strong Markov and satisfy an `almost-continuity' condition. We also give a simple condition for the limit to be a continuous diffusion. These results contrast with the multidimensional case where, as we show with an example, a sequence of two dimensional martingale diffusions can converge to a process that is both discontinuous and non-Markov.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:01:10 GMT" }, { "version": "v2", "created": "Sun, 17 Aug 2008 19:23:53 GMT" } ]
2009-05-14T00:00:00
[ [ "Lowther", "George", "" ] ]
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712.2429
Filippo Palombi
P.Dimopoulos, G.Herdoiza, F.Palombi, M.Papinutto, C.Pena, A.Vladikas and H.Wittig
Non-perturbative renormalisation of Delta F=2 four-fermion operators in two-flavour QCD
26 pages, 8 figures
JHEP0805:065,2008
10.1088/1126-6708/2008/05/065
null
hep-lat
null
Using Schroedinger Functional methods, we compute the non-perturbative renormalisation and renormalisation group running of several four-fermion operators, in the framework of lattice simulations with two dynamical Wilson quarks. Two classes of operators have been targeted: (i) those with left-left current structure and four propagating quark fields; (ii) all operators containing two static quarks. In both cases, only the parity-odd contributions have been considered, being the ones that renormalise multiplicatively. Our results, once combined with future simulations of the corresponding lattice hadronic matrix elements, may be used for the computation of phenomenological quantities of interest, such as B_K and B_B (the latter also in the static limit).
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:07:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Dimopoulos", "P.", "" ], [ "Herdoiza", "G.", "" ], [ "Palombi", "F.", "" ], [ "Papinutto", "M.", "" ], [ "Pena", "C.", "" ], [ "Vladikas", "A.", "" ], [ "Wittig", "H.", "" ] ]
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712.243
Gusztav Morvai
L. Gyorfi, G. Morvai, and S. Yakowitz
Limits to consistent on-line forecasting for ergodic time series
null
IEEE Trans. Inform. Theory 44 (1998), no. 2, 886--892
10.1109/18.661540
null
math.PR cs.IT math.IT
null
This study concerns problems of time-series forecasting under the weakest of assumptions. Related results are surveyed and are points of departure for the developments here, some of which are new and others are new derivations of previous findings. The contributions in this study are all negative, showing that various plausible prediction problems are unsolvable, or in other cases, are not solvable by predictors which are known to be consistent when mixing conditions hold.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:08:07 GMT" } ]
2016-11-17T00:00:00
[ [ "Gyorfi", "L.", "" ], [ "Morvai", "G.", "" ], [ "Yakowitz", "S.", "" ] ]
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712.2431
Sean Fitzpatrick
Sean Fitzpatrick
An equivariant index formula for elliptic actions on contact manifolds
23 pages; Final (publication) version - to appear in MRL. Further typo fixes, extension of final corollary from formula at the identity to the entire group
null
null
null
math.DG math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given an elliptic action of a compact Lie group $G$ on a co-oriented contact manifold $(M,E)$ one obtains two naturally associated objects: A $G$-transversally elliptic operator $\dirac$, and an equivariant differential form with generalised coefficients $\mathcal{J}(E,X)$ defined in terms of a choice of contact form on $M$. We explain how the form $\mathcal{J}(E,X)$ is natural with respect to the contact structure, and give a formula for the equivariant index of $\dirac$ involving $\mathcal{J}(E,X)$. A key tool is the Chern character with compact support developed by Paradan-Vergne \cite{PV1,PV}.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:16:14 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 20:59:50 GMT" }, { "version": "v3", "created": "Wed, 23 Jan 2008 21:10:23 GMT" }, { "version": "v4", "created": "Mon, 23 Jun 2008 14:53:23 GMT" } ]
2008-06-23T00:00:00
[ [ "Fitzpatrick", "Sean", "" ] ]
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712.2432
Richard Hepworth
Richard A. Hepworth
Morse Inequalities for Orbifold Cohomology
null
Algebr. Geom. Topol. 9 (2009), no. 2, 1105-1175
10.2140/agt.2009.9.1105
null
math.AT math.GT
null
This paper begins the study of Morse theory for orbifolds, or more precisely for differentiable Deligne-Mumford stacks. The main result is an analogue of the Morse inequalities that relates the orbifold Betti numbers of an almost-complex orbifold to the critical points of a Morse function on the orbifold. We also show that a generic function on an orbifold is Morse. In obtaining these results we develop for differentiable Deligne-Mumford stacks those tools of differential geometry and topology -- flows of vector fields, the strong topology -- that are essential to the development of Morse theory on manifolds.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:14:13 GMT" } ]
2010-08-24T00:00:00
[ [ "Hepworth", "Richard A.", "" ] ]
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712.2433
Ilwoo Cho
Ilwoo Cho and Palle E. T. Jorgensen
C*-Algebras Generated by Partial Isometries
null
null
null
null
math.OA math-ph math.MP
null
In this paper, we characterize the C*-Algebra generated by partial isometries.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:16:30 GMT" } ]
2007-12-17T00:00:00
[ [ "Cho", "Ilwoo", "" ], [ "Jorgensen", "Palle E. T.", "" ] ]
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712.2434
Klaus Larjo
Vijay Balasubramanian, Bartlomiej Czech, Yang-Hui He, Klaus Larjo and Joan Simon
Typicality, Black Hole Microstates and Superconformal Field Theories
40 pages + 3 appendices, 11 figures
JHEP 0803:008,2008
10.1088/1126-6708/2008/03/008
UPR-1189-T
hep-th
null
We analyze the structure of heavy multitrace BPS operators in N = 1 superconformal quiver gauge theories that arise on the worldvolume of D3-branes on an affine toric cone. We exhibit a geometric procedure for counting heavy mesonic operators with given U(1) charges. We show that for any fixed linear combination of the U(1) charges, the entropy is maximized when the charges are in certain ratios. This selects preferred directions in the charge space that can be determined with the help of a piece of string. We show that almost all heavy mesonic operators of fixed U(1) charges share a universal structure. This universality reflects the properties of the dual extremal black holes whose microstates they create. We also interpret our results in terms of typical configurations of dual giant gravitons in AdS space.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:32:46 GMT" } ]
2009-12-15T00:00:00
[ [ "Balasubramanian", "Vijay", "" ], [ "Czech", "Bartlomiej", "" ], [ "He", "Yang-Hui", "" ], [ "Larjo", "Klaus", "" ], [ "Simon", "Joan", "" ] ]
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712.2435
John Fredsted Mr.
John Fredsted
Linking electroweak and gravitational generators
7 pages, LaTeX; typos corrected
null
null
null
math-ph math.MP
null
Using complexified quaternions, an intriguing link between generators of two different and surprisingly commuting four-dimensional representations of the SU(2)xU(1) Lie group, and generators of two four-dimensional spin 1/2 representations of the Spin(3,1) Lie group is established: the former generators completely determine the latter ones, and cross-combined they constitute two different, but closely related, four-dimensional representations of Spin(3,1)xSU(2)xU(1). These representations are used to construct a Spin(3,1)xSU(2)xU(1) gauge invariant Lagrangian, containing two four-spinors consisting not as usual of Weyl two-spinors of opposite helicity and equal weak isospin, but instead of Weyl two-spinors of opposite weak isospin and equal helicity, a construction which arises naturally from the mathematical formalism itself. A possible future generalization, using complexified octonions, is discussed.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:37:24 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 08:09:26 GMT" } ]
2007-12-17T00:00:00
[ [ "Fredsted", "John", "" ] ]
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712.2436
David Branch
David Branch, David J. Jeffery, Jerod Parrent, E. Baron, M. A. Troxel, V. Stanishev, Melissa Keithley, Joshua Harrison, and Christopher Bruner
Comparative Direct Analysis of Type Ia Supernova Spectra. IV. Postmaximum
Accepted by PASP
null
10.1086/527572
null
astro-ph
null
A comparative study of optical spectra of Type Ia supernovae (SNe Ia) obtained near 1 week, 3 weeks, and 3 months after maximum light is presented. Most members of the four groups that were defined on the basis of maximum light spectra in Paper II (core normal, broad line, cool, and shallow silicon) develop highly homogeneous postmaximum spectra, although there are interesting exceptions. Comparisons with SYNOW synthetic spectra show that most of the spectral features can be accounted for in a plausible way. The fits show that 3 months after maximum light, when SN Ia spectra are often said to be in the nebular phase and to consist of forbidden emission lines, the spectra actually remain dominated by resonance scattering features of permitted lines, primarily those of Fe II. Even in SN 1991bg, which is said to have made a very early transition to the nebular phase, there is no need to appeal to forbidden lines at 3 weeks postmaximum, and at 3 months postmaximum the only clear identification of a forbidden line is [Ca II] 7291, 7324. Recent studies of SN Ia rates indicate that most of the SNe Ia that have ever occurred have been "prompt" SNe Ia, produced by young (100,000,000 yr) stellar populations, while most of the SNe Ia that occur at low redshift today are "tardy", produced by an older (several Gyrs) population. We suggest that the shallow silicon SNe Ia tend to be the prompt ones.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:43:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Branch", "David", "" ], [ "Jeffery", "David J.", "" ], [ "Parrent", "Jerod", "" ], [ "Baron", "E.", "" ], [ "Troxel", "M. A.", "" ], [ "Stanishev", "V.", "" ], [ "Keithley", "Melissa", "" ], [ "Harrison", "Joshua", "" ], [ "Bruner", "Christopher", "" ] ]
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712.2437
William Bialek
Tamara Broderick, Miroslav Dudik, Gasper Tkacik, Robert E. Schapire and William Bialek
Faster solutions of the inverse pairwise Ising problem
null
null
null
null
q-bio.QM cond-mat.dis-nn q-bio.NC
null
Recent work has shown that probabilistic models based on pairwise interactions-in the simplest case, the Ising model-provide surprisingly accurate descriptions of experiments on real biological networks ranging from neurons to genes. Finding these models requires us to solve an inverse problem: given experimentally measured expectation values, what are the parameters of the underlying Hamiltonian? This problem sits at the intersection of statistical physics and machine learning, and we suggest that more efficient solutions are possible by merging ideas from the two fields. We use a combination of recent coordinate descent algorithms with an adaptation of the histogram Monte Carlo method, and implement these techniques to take advantage of the sparseness found in data on real neurons. The resulting algorithm learns the parameters of an Ising model describing a network of forty neurons within a few minutes. This opens the possibility of analyzing much larger data sets now emerging, and thus testing hypotheses about the collective behaviors of these networks.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:31:32 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 20:50:50 GMT" } ]
2007-12-18T00:00:00
[ [ "Broderick", "Tamara", "" ], [ "Dudik", "Miroslav", "" ], [ "Tkacik", "Gasper", "" ], [ "Schapire", "Robert E.", "" ], [ "Bialek", "William", "" ] ]
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712.2438
Peter Bosted
CLAS Collaboration: P.E. Bosted, R. Fersch, et al
Ratios of 15N/12C and 4He/12C inclusive electroproduction cross sections in the nucleon resonance region
13 pages, 2 figures. Significantly shortened version. Results unchanged. Small additions for Phys. Rev. C
Phys.Rev.C78:015202,2008
10.1103/PhysRevC.78.015202
JLAB-PHY-08-4
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The (W,Q2)-dependence of the ratio of inclusive electron scattering cross sections for 15N/12C was determined in the kinematic range 0.8<W<2 GeV and 0.2<Q2<1 GeV2 using 2.285 GeV electrons and the CLAS detector at Jefferson Lab. The ratios exhibit only slight resonance structure, in agreement with a simple phenomenological model and an extrapolation of DIS ratios to low Q2. Ratios of 4He/12C using 1.6 to 2.5 GeV electrons were measured with very high statistical precision, and were used to correct for He in the N and C targets. The (W,Q2) dependence of the 4He/12C ratios is in good agreement with the phenomenological model, and exhibit significant resonance structure centered at W=0.94, 1.23 and 1.5 GeV.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:32:38 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 19:05:49 GMT" }, { "version": "v3", "created": "Thu, 12 Jun 2008 14:35:42 GMT" } ]
2010-04-06T00:00:00
[ [ "CLAS Collaboration", "", "" ], [ "Bosted", "P. E.", "" ], [ "Fersch", "R.", "" ] ]
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712.2439
Charles Suggs
Claudio Chamon, Chang-Yu Hou, Roman Jackiw, Christopher Mudry, So-Young Pi, Gordon Semenoff
Electron fractionalization for two-dimensional Dirac fermions
18 pages, 2 figures
Phys.Rev.B77:235431,2008
10.1103/PhysRevB.77.235431
BU 07-08, MIT-CTP 3910
hep-th cond-mat.str-el physics.atom-ph quant-ph
null
Fermion-number fractionalization without breaking of time-reversal symmetry was recently demonstrated for a field theory in $(2+1)$-dimensional space and time that describes the couplings between massive Dirac fermions, a complex-valued Higgs field carrying an axial gauge charge of 2, and a U(1) axial gauge field. Charge fractionalization occurs whenever the Higgs field either supports vortices by itself, or when these vortices are accompanied by half-vortices in the axial gauge field. The fractional charge is computed by three different techniques. A formula for the fractional charge is given as a function of a parameter in the Dirac Hamiltonian that breaks the spectral energy-reflection symmetry. In the presence of a charge $\pm1$ vortex in the Higgs field only, the fractional charge varies continuously and thus can take irrational values. The simultaneous presence of a half-vortex in the axial gauge field and a charge $\pm1$ vortex in the Higgs field re-rationalizes the fractional charge to the value 1/2.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:49:35 GMT" } ]
2008-11-07T00:00:00
[ [ "Chamon", "Claudio", "" ], [ "Hou", "Chang-Yu", "" ], [ "Jackiw", "Roman", "" ], [ "Mudry", "Christopher", "" ], [ "Pi", "So-Young", "" ], [ "Semenoff", "Gordon", "" ] ]
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712.244
Seade Jose
Jos\'e-Luis Cisneros-Molina, Jose Seade and Jawad Snoussi
Refinements of Milnor's Fibration Theorem for Complex Singularities
37 pages, LaTeX; slightly modified title and abstract, rewrote introduction, reorganized parts of the paper and references added; some errors have been fixed and some improved results added; some lemmas added and a proof extended. To appear in Advances in Mathematics
null
null
null
math.AG math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $X$ be an analytic subset of an open neighbourhood $U$ of the origin $\underline{0}$ in $\mathbb{C}^n$. Let $f\colon (X,\underline{0}) \to (\mathbb{C},0)$ be holomorphic and set $V =f^{-1}(0)$. Let $\B_\epsilon$ be a ball in $U$ of sufficiently small radius $\epsilon>0$, centred at $\underline{0}\in\mathbb{C}^n$. We show that $f$ has an associated canonical pencil of real analytic hypersurfaces $X_\theta$, with axis $V$, which leads to a fibration $\Phi$ of the whole space $(X \cap \mathbb{B}_\epsilon) \setminus V$ over $\mathbb{S}^1 $. Its restriction to $(X \cap \mathbb{S}_\epsilon) \setminus V$ is the usual Milnor fibration $\phi = \frac{f}{|f|}$, while its restriction to the Milnor tube $f^{-1}(\partial \D_\eta) \cap \mathbb{B}_\epsilon$ is the Milnor-L\^e fibration of $f$. Each element of the pencil $X_\theta$ meets transversally the boundary sphere $\mathbb{S}_\epsilon = \partial \B_\epsilon$, and the intersection is the union of the link of $f$ and two homeomorphic fibers of $\phi$ over antipodal points in the circle. Furthermore, the space ${\tilde X}$ obtained by the real blow up of the ideal $(Re(f), Im(f))$ is a fibre bundle over $\mathbb{R} \mathbb{P}^1$ with the $X_\theta$ as fibres. These constructions work also, to some extent, for real analytic map-germs, and give us a clear picture of the differences, concerning Milnor fibrations, between real and complex analytic singularities.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:51:13 GMT" }, { "version": "v2", "created": "Sat, 28 Jun 2008 14:05:39 GMT" }, { "version": "v3", "created": "Thu, 21 May 2009 18:23:51 GMT" } ]
2009-05-21T00:00:00
[ [ "Cisneros-Molina", "José-Luis", "" ], [ "Seade", "Jose", "" ], [ "Snoussi", "Jawad", "" ] ]
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712.2441
Pisin Chen
Pisin Chen and Je-An Gu
Cosmological Constant as a Manifestation of the Hierarchy
null
null
null
null
hep-th astro-ph
null
There has been the suggestion that the cosmological constant as implied by the dark energy is related to the well-known hierarchy between the Planck scale, $M_{\rm Pl}$, and the Standard Model scale, $M_{\rm SM}$. Here we further propose that the same framework that addresses this hierarchy problem must also address the smallness problem of the cosmological constant. Specifically, we investigate the minimal supersymmetric (SUSY) extension of the Randall-Sundrum model where SUSY-breaking is induced on the TeV brane and transmitted into the bulk. We show that the Casimir energy density of the system indeed conforms with the observed dark energy scale.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:03:10 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 20:47:10 GMT" }, { "version": "v3", "created": "Thu, 20 Dec 2007 17:58:12 GMT" } ]
2007-12-20T00:00:00
[ [ "Chen", "Pisin", "" ], [ "Gu", "Je-An", "" ] ]
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712.2442
Marc Schumann
M. Schumann, M. Kreuz, M. Deissenroth, F. Glueck, J. Krempel, B. Maerkisch, D. Mund, A. Petoukhov, T. Soldner, H. Abele
Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay
4 pages, 2 figures
Phys.Rev.Lett.100:151801,2008
10.1103/PhysRevLett.100.151801
null
hep-ph
null
The proton asymmetry parameter C in neutron decay describes the correlation between neutron spin and proton momentum. In this Letter, the first measurement of this quantity is presented. The result C=-0.2377(26) agrees with the Standard Model expectation. The coefficient C provides an additional parameter for new and improved Standard Model tests. From a differential analysis of the same data (assuming the Standard Model), we obtain lambda=-1.275(16) as ratio of axial-vector and vector coupling constant.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:13:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Schumann", "M.", "" ], [ "Kreuz", "M.", "" ], [ "Deissenroth", "M.", "" ], [ "Glueck", "F.", "" ], [ "Krempel", "J.", "" ], [ "Maerkisch", "B.", "" ], [ "Mund", "D.", "" ], [ "Petoukhov", "A.", "" ], [ "Soldner", "T.", "" ], [ "Abele", "H.", "" ] ]
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712.2443
Daniel Ueltschi
Daniel Ueltschi
The model of interacting spatial permutations and its relation to the Bose gas
14 pages
Mathematical Results in Quantum Mechanics, pp 255-272, World Scientific (2008)
null
null
cond-mat.stat-mech math-ph math.MP
null
The model of spatial permutations is related to the Feynman-Kac representation of the Bose gas. The transition to infinite cycles corresponds to Bose-Einstein condensation. We review the general setting and some results, and we derive a multi-body interaction between permutation jumps, that is due to the original interactions between quantum particles.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:16:31 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 23:04:34 GMT" }, { "version": "v3", "created": "Sat, 15 Mar 2008 16:53:47 GMT" } ]
2009-08-18T00:00:00
[ [ "Ueltschi", "Daniel", "" ] ]
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712.2444
Mikhail Lyubich
Jeremy Kahn and Mikhail Lyubich
A priori bounds for some infinitely renormalizable quadratics: III. Molecules
null
null
null
Stony Brook IMS # 2007/4
math.DS
null
In this paper we prove {\it a priori bounds} for infinitely renormalizable quadratic polynomials satisfying a ``molecule condition''. Roughly speaking, this condition ensures that the renormalization combinatorics stay away from the satellite types. These {\it a priori bounds} imply local connectivity of the corresponding Julia sets and the Mandelbrot set at the corresponding parameter values.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:27:38 GMT" } ]
2007-12-17T00:00:00
[ [ "Kahn", "Jeremy", "" ], [ "Lyubich", "Mikhail", "" ] ]
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712.2445
Maurizio Iori
M. Iori and A. Sergi
An orientable time of flight detector for cosmic rays
4 pages, Nuclear Instruments and methods, Proceedings Ricap07
Nucl.Instrum.Meth.A588:151-154,2008
10.1016/j.nima.2008.01.030
null
astro-ph
null
Cosmic ray studies, in particular UHECR, can be in general supported by a directional, easy deployable, simple and robust detector. The design of this detector is based on the time of flight between two parallel tiles of scintillator, to distinguish particle passing through in opposite directions; by fine time resolution and pretty adjustable acceptance it is possible to select upward(left)/downward(right) cosmic rays. It has been developed for an array of detectors to measure upward $\tau$ from Earth-Skimming neutrino events with energy above $10^8 GeV$. The properties and performances of the detector are discussed. Test results from a high noise environment are presented.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:31:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Iori", "M.", "" ], [ "Sergi", "A.", "" ] ]
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712.2446
Rafael Garcia
R. Garcia, E. Subashi, M. Fukuto
Thin-thick coexistence behavior of 8CB liquid crystalline films on silicon
4 pages, 3 figures
null
10.1103/PhysRevLett.100.197801
null
cond-mat.soft cond-mat.stat-mech
null
The wetting behavior of thin films of 4'-n-octyl-4-cyanobiphenyl (8CB) on Si is investigated via optical and x-ray reflectivity measurement. An experimental phase diagram is obtained showing a broad thick-thin coexistence region spanning the bulk isotropic-to-nematic ($T_{IN}$) and the nematic-to-smectic-A ($T_{NA}$) temperatures. For Si surfaces with coverages between 47 and $72\pm3$ nm, reentrant wetting behavior is observed twice as we increase the temperature, with separate coexistence behaviors near $T_{IN}$ and $T_{NA}$. For coverages less than 47 nm, however, the two coexistence behaviors merge into a single coexistence region. The observed thin-thick coexistence near the second-order NA transition is not anticipated by any previous theory or experiment. Nevertheless, the behavior of the thin and thick phases within the coexistence regions is consistent with this being an equilibrium phenomenon.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:34:08 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 20:37:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Garcia", "R.", "" ], [ "Subashi", "E.", "" ], [ "Fukuto", "M.", "" ] ]
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712.2447
Joey Huston
S.D. Ellis, J. Huston, K. Hatakeyama, P. Loch, M. Toennesmann
Jets in Hadron-Hadron Collisions
68 pages, 54 figures
Prog.Part.Nucl.Phys.60:484-551,2008
10.1016/j.ppnp.2007.12.002
null
hep-ph
null
In this article, we review some of the complexities of jet algorithms and of the resultant comparisons of data to theory. We review the extensive experience with jet measurements at the Tevatron, the extrapolation of this acquired wisdom to the LHC and the differences between the Tevatron and LHC environments. We also describe a framework (SpartyJet) for the convenient comparison of results using different jet algorithms.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:30:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Ellis", "S. D.", "" ], [ "Huston", "J.", "" ], [ "Hatakeyama", "K.", "" ], [ "Loch", "P.", "" ], [ "Toennesmann", "M.", "" ] ]
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712.2448
Shamil Shakirov
E. T. Akhmedov and Sh. Shakirov
Gluing of Surfaces with Polygonal Boundaries
7 pages, 9 figures
null
null
ITEP/TH-78/07
math.CO math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By pairwise gluing of edges of a polygon, one produces two-dimensional surfaces with handles and boundaries. In this paper, we count the number ${\cal N}_{g,L}(n_1, n_2, ..., n_L)$ of different ways to produce a surface of given genus $g$ with $L$ polygonal boundaries with given numbers of edges $n_1, n_2, >..., n_L$. Using combinatorial relations between graphs on real two-dimensional surfaces, we derive recursive relations between ${\cal N}_{g,L}$. We show that Harer-Zagier numbers appear as a particular case of ${\cal N}_{g,L}$ and derive a new explicit expression for them.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 12:16:21 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 20:44:26 GMT" }, { "version": "v3", "created": "Tue, 8 Apr 2008 12:13:35 GMT" }, { "version": "v4", "created": "Sun, 24 Aug 2008 11:20:45 GMT" } ]
2008-08-24T00:00:00
[ [ "Akhmedov", "E. T.", "" ], [ "Shakirov", "Sh.", "" ] ]
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712.2449
Philipp Mayr
Philipp Mayr, Peter Mutschke, Vivien Petras
Reducing semantic complexity in distributed Digital Libraries: treatment of term vagueness and document re-ranking
12 pages, 4 figures
null
10.1108/00242530810865484
null
cs.DL
null
The purpose of the paper is to propose models to reduce the semantic complexity in heterogeneous DLs. The aim is to introduce value-added services (treatment of term vagueness and document re-ranking) that gain a certain quality in DLs if they are combined with heterogeneity components established in the project "Competence Center Modeling and Treatment of Semantic Heterogeneity". Empirical observations show that freely formulated user terms and terms from controlled vocabularies are often not the same or match just by coincidence. Therefore, a value-added service will be developed which rephrases the natural language searcher terms into suggestions from the controlled vocabulary, the Search Term Recommender (STR). Two methods, which are derived from scientometrics and network analysis, will be implemented with the objective to re-rank result sets by the following structural properties: the ranking of the results by core journals (so-called Bradfordizing) and ranking by centrality of authors in co-authorship networks.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:24:26 GMT" } ]
2019-01-15T00:00:00
[ [ "Mayr", "Philipp", "" ], [ "Mutschke", "Peter", "" ], [ "Petras", "Vivien", "" ] ]
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712.245
Hamed Shojaei
Micheal S. Berger and Hamed Shojaei
Possible Equilibria of Interacting Dark Energy Models
18 pages, 5 figures
Phys.Rev.D77:123504,2008
10.1103/PhysRevD.77.123504
IUHET-512
gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Interacting dark energy and the holographic principle offer a possible way of addressing the cosmic coincidence problem as well as accounting for the size of the dark energy component. The equilibrium points of the Friedmann equations which govern the evolution behavior of dark energy, matter, and curvature components can determine the qualitative behavior of the cosmological models. These possible equilibria and their behavior are examined in a general framework, and some illustrative examples are presented.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:13:29 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 05:09:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Berger", "Micheal S.", "" ], [ "Shojaei", "Hamed", "" ] ]
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712.2451
Dam Thanh Son
R. Baier, P. Romatschke, D. T. Son, A. O. Starinets, M. A. Stephanov
Relativistic viscous hydrodynamics, conformal invariance, and holography
32 pages, 1 figure; v2: references added; v3: typos corrected
JHEP0804:100,2008
10.1088/1126-6708/2008/04/100
BI-TP 2007/29, INT PUB 07-45, SHEP-07-47
hep-th hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider second-order viscous hydrodynamics in conformal field theories at finite temperature. We show that conformal invariance imposes powerful constraints on the form of the second-order corrections. By matching to the AdS/CFT calculations of correlators, and to recent results for Bjorken flow obtained by Heller and Janik, we find three (out of five) second-order transport coefficients in the strongly coupled N=4 supersymmetric Yang-Mills theory. We also discuss how these new coefficents can arise within the kinetic theory of weakly coupled conformal plasmas. We point out that the Mueller-Israel-Stewart theory, often used in numerical simulations, does not contain all allowed second-order terms and, frequently, terms required by conformal invariance.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:00:05 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 22:13:37 GMT" }, { "version": "v3", "created": "Tue, 15 Jul 2008 16:41:57 GMT" } ]
2008-11-26T00:00:00
[ [ "Baier", "R.", "" ], [ "Romatschke", "P.", "" ], [ "Son", "D. T.", "" ], [ "Starinets", "A. O.", "" ], [ "Stephanov", "M. A.", "" ] ]
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712.2452
Francesco Saitta
F. Saitta, V. D'Odorico, M. Bruscoli, S.Cristiani, P. Monaco, M. Viel
Tracing the gas at redshift 1.7-3.5 with the Lyman-alpha forest: the FLO approach
17 figures and 2 tables, accepted for publication in MNRAS
Mon.Not.Roy.Astron.Soc. 385 (2008) 519-530
10.1111/j.1365-2966.2008.12860.x
null
astro-ph
null
[Abridged] We present FLO (From Lines to Over-densities), a new technique to reconstruct the hydrogen density field for the Lya forest lines observed in high resolution QSO spectra. The method is based on the hypothesis that the Lya lines arise in the low to intermediate density intergalactic gas and that the Jeans length is the typical size of the Lya absorbers. The reliability of FLO is tested against mock spectra obtained from cosmological simulations. The recovering algorithm gives satisfactory results in the range from the mean density to over-densities of ~30 and reproduces correctly the correlation function of the density field and the 1D power spectrum on scales between ~20 and 60 comoving Mpc. A sample of Lya forests from 22 high resolution QSO spectra is analysed, covering the redshift range 1.7<z<3.5. For each line of sight, we fit Voigt profiles to the lines of the Lya forest, providing the largest, homogeneous sample of fitted Lya lines ever studied. The line number density evolution with redshift follows a power-law relation: dn/dz=(166 +/- 4) [(1+z)/3.5]^{(2.8 +/- 0.2)} (1 sigma errors). The two-point correlation function of lines shows a signal up to separations of ~2 comoving Mpc; weak lines (log N(HI)<13.8) also show a significant clustering but on smaller scales (r<1.5 comoving Mpc). We estimate with FLO the hydrogen density field toward the 22 observed lines of sight. The redshift distribution of the average densities computed for each QSO is consistent with the cosmic mean hydrogen density in the analysed redshift range. The two-point correlation function and the 1D power spectrum of the delta field are estimated. The correlation function shows clustering signal up to ~4 comoving Mpc.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 12:56:57 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 14:29:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Saitta", "F.", "" ], [ "D'Odorico", "V.", "" ], [ "Bruscoli", "M.", "" ], [ "Cristiani", "S.", "" ], [ "Monaco", "P.", "" ], [ "Viel", "M.", "" ] ]
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712.2453
Troels Haugb{\o}lle
Troels Haugboelle, Jesper Sommer-Larsen, Kristian Pedersen
Sunyaev-Zeldovich profiles for clusters and groups of galaxies
7 pages, 9 figures
null
null
null
astro-ph
null
The Sunyaev-Zeldovich (SZ) effect gives a measure of the thermal energy and electron pressure in groups and clusters of galaxies. In the near future SZ surveys will map hundreds of systems, shedding light on the pressure distribution in the systems. The thermal energy is related to the total mass of a system of galaxies, but it is only a projection that is observed through the SZ effect. A model for the 3D distribution of pressure is needed to link the SZ signal to the total mass of the system. In this work we construct an empirical model for the 2D and 3D SZ profile, and compare it to a set of realistic high resolution SPH simulations of galaxy clusters and groups, and to a stacked SZ profile for massive clusters derived from WMAP data. Furthermore, we combine observed temperature profiles with dark matter potentials to yield an additional constraint, under the assumption of hydrostatic equilibrium. We find a very tight correlation between the characteristic scale in the model, the integrated SZ signal, and the total mass in the systems with a scatter of only 4%. The model only contains two free parameters, making it readily applicable even to low resolution SZ observations of galaxy clusters. A fitting routine for the model that can be applied to observed or simulated data can be found at http://www.phys.au.dk/~haugboel/software.shtml
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:42:27 GMT" } ]
2007-12-18T00:00:00
[ [ "Haugboelle", "Troels", "" ], [ "Sommer-Larsen", "Jesper", "" ], [ "Pedersen", "Kristian", "" ] ]
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712.2454
Yasunori Nomura
Lawrence J. Hall and Yasunori Nomura
Evidence for the Multiverse in the Standard Model and Beyond
79 pages, 23 figures
Phys.Rev.D78:035001,2008
10.1103/PhysRevD.78.035001
UCB-PTH-07/26
hep-ph astro-ph hep-th
null
In any theory it is unnatural if the observed parameters lie very close to special values that determine the existence of complex structures necessary for observers. A naturalness probability, P, is introduced to numerically evaluate the unnaturalness. If P is small in all known theories, there is an observer naturalness problem. In addition to the well-known case of the cosmological constant, we argue that nuclear stability and electroweak symmetry breaking (EWSB) represent significant observer naturalness problems. The naturalness probability associated with nuclear stability is conservatively estimated as P_nuc < 10^{-(3-2)}, and for simple EWSB theories P_EWSB < 10^{-(2-1)}. This pattern of unnaturalness in three different arenas, cosmology, nuclear physics, and EWSB, provides evidence for the multiverse. In the nuclear case the problem is largely solved even with a flat multiverse distribution, and with nontrivial distributions it is possible to understand both the proximity to neutron stability and the values of m_e and m_d - m_u in terms of the electromagnetic contribution to the proton mass. It is reasonable that multiverse distributions are strong functions of Lagrangian parameters due to their dependence on various factors. In any EWSB theory, strongly varying distributions typically lead to a little or large hierarchy, and in certain multiverses the size of the little hierarchy is enhanced by a loop factor. Since the correct theory of EWSB is unknown, our estimate for P_EWSB is theoretical. The LHC will determine P_EWSB more robustly, which may remove or strengthen the observer naturalness problem of EWSB. For each of the three arenas, the discovery of a natural theory would eliminate the evidence for the multiverse; but in the absence of such a theory, the multiverse provides a provisional understanding of the data.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 14:43:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Hall", "Lawrence J.", "" ], [ "Nomura", "Yasunori", "" ] ]
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712.2455
Kaustubh Agashe
Kaustubh Agashe, Adam Falkowski, Ian Low and Geraldine Servant
KK Parity in Warped Extra Dimension
35 pages, 11 figures
JHEP 0804:027,2008
10.1088/1126-6708/2008/04/027
ANL-HEP-PR-07-104, CERN-PH-TH/2007-247, SPhT-T07/153, SU-4252-863, UMD-PP-07-008
hep-ph
null
We construct models with a Kaluza-Klein (KK) parity in a five- dimensional warped geometry, in an attempt to address the little hierarchy problem present in setups with bulk Standard Model fields. The lightest KK particle (LKP) is stable and can play the role of dark matter. We consider the possibilities of gluing two identical slices of 5D AdS in either the UV (IR-UV-IR model) or the IR region (UV-IR-UV model) and discuss the model-building issues as well as phenomenological properties in both cases. In particular, we find that the UV-IR-UV model is not gravitationally stable and that additional mechanisms might be required in the IR-UV-IR model in order to address flavor issues. Collider signals of the warped KK parity are different from either the conventional warped extra dimension without KK parity, in which the new particles are not necessarily pair-produced, or the KK parity in flat universal extra dimensions, where each KK level is nearly degenerate in mass. Dark matter and collider properties of a TeV mass KK Z gauge boson as the LKP are discussed.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 16:36:40 GMT" } ]
2009-12-15T00:00:00
[ [ "Agashe", "Kaustubh", "" ], [ "Falkowski", "Adam", "" ], [ "Low", "Ian", "" ], [ "Servant", "Geraldine", "" ] ]
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712.2456
Mukund Rangamani
Sayantani Bhattacharyya, Veronika E Hubeny, Shiraz Minwalla, Mukund Rangamani
Nonlinear Fluid Dynamics from Gravity
46 pages, latex. v2: added refs and new section discussing second order hydrodynamics. v3: typos corrected. v4: typos corrected
JHEP 0802:045,2008
10.1088/1126-6708/2008/02/045
null
hep-th gr-qc nucl-th
null
Black branes in AdS5 appear in a four parameter family labeled by their velocity and temperature. Promoting these parameters to Goldstone modes or collective coordinate fields -- arbitrary functions of the coordinates on the boundary of AdS5 -- we use Einstein's equations together with regularity requirements and boundary conditions to determine their dynamics. The resultant equations turn out to be those of boundary fluid dynamics, with specific values for fluid parameters. Our analysis is perturbative in the boundary derivative expansion but is valid for arbitrary amplitudes. Our work may be regarded as a derivation of the nonlinear equations of boundary fluid dynamics from gravity. As a concrete application we find an explicit expression for the expansion of this fluid stress tensor including terms up to second order in the derivative expansion.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:01:02 GMT" }, { "version": "v2", "created": "Tue, 1 Jan 2008 10:33:34 GMT" }, { "version": "v3", "created": "Mon, 4 Feb 2008 11:02:40 GMT" }, { "version": "v4", "created": "Wed, 2 Apr 2008 17:04:59 GMT" } ]
2009-07-09T00:00:00
[ [ "Bhattacharyya", "Sayantani", "" ], [ "Hubeny", "Veronika E", "" ], [ "Minwalla", "Shiraz", "" ], [ "Rangamani", "Mukund", "" ] ]
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712.2457
Elizabeth R. Stanway
Elizabeth Stanway (University of Bristol), Malcolm Bremer (University of Bristol), Matthew Lehnert (GEPI Observatoire de Paris)
On Contamination and Completeness in z>5 Lyman Break Galaxy Surveys
Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12853.x
null
astro-ph
null
A large population of z>5 Lyman break galaxies has been identified in recent years. However, the high redshift galaxies selected by different surveys are subject to a variety of selection effects - some overt, others more subtle. We present an analysis of sample completeness and contamination issues in high redshift surveys, focusing on surveys at z=5 and using a spectroscopically-confirmed low redshift sample from the DEEP2 survey in order to characterise contaminant galaxies. We find that most surveys underestimate their contamination from highly clustered galaxies at z=1 and stars. We consider the consequences of this for both the rest-frame ultraviolet luminosity function and the clustering signal from z=5 galaxies. We also find that sources with moderate strength Lyman-alpha emission lines can be omitted from dropout surveys due to their blue colours, again effecting the derived luminosity functions. We discuss the points of comparison between different samples, and the applicability of survey-specific results to the population at z>5 in general.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:02:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Stanway", "Elizabeth", "", "University of Bristol" ], [ "Bremer", "Malcolm", "", "University\n of Bristol" ], [ "Lehnert", "Matthew", "", "GEPI Observatoire de Paris" ] ]
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712.2458
Gail Zasowski
G. Zasowski, F. Kemper, Dan M. Watson, E. Furlan, C.J. Bohac, C. Hull, J.D. Green
Spitzer IRS Observations of Class I/II Objects in Taurus: Composition and Thermal History of the Circumstellar Ices
Accepted to ApJ. 40 pages, 20 figures
null
10.1088/0004-637X/694/1/459
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present observations of Taurus-Auriga Class I/II protostars obtained with the Spitzer InfraRed Spectrograph. Detailed spectral fits to the 6 and 15 micron features are made, using publicly-available laboratory data, to constrain the molecular composition, abundances, and levels of thermal processing along the lines of sight. We provide an inventory of the molecular environments observed, which have an average composition dominated by water ice with ~12% CO_2 (abundance relative to H_2O), >~2-9% CH_3OH, <~14% NH_3, ~4% CH_4, ~2% H_2CO, ~0.6% HCOOH, and ~0.5% SO_2. We find CO_2/H_2O ratios nearly equivalent to those observed in cold clouds and lines of sight toward the galactic center. The unidentified 6.8 micron profiles vary from source to source, and it is shown to be likely that even combinations of the most common candidates (NH_4+ and CH_3OH) are inadequate to explain the feature fully. We discuss correlations among SED spectral indices, abundance ratios, and thermally-processed ice fractions and their implications for CO_2 formation and evolution. Comparison of our spectral fits with cold molecular cloud sight-lines indicates abundant prestellar ice environments made even richer by the radiative effects of protostars. Our results add additional constraints and a finer level of detail to current full-scale models of protostellar and protoplanetary systems.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:17:46 GMT" }, { "version": "v2", "created": "Mon, 15 Dec 2008 21:32:27 GMT" } ]
2015-05-13T00:00:00
[ [ "Zasowski", "G.", "" ], [ "Kemper", "F.", "" ], [ "Watson", "Dan M.", "" ], [ "Furlan", "E.", "" ], [ "Bohac", "C. J.", "" ], [ "Hull", "C.", "" ], [ "Green", "J. D.", "" ] ]
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712.2459
Joshua Simon
Joshua D. Simon (Caltech) and Erik Rosolowsky (CfA)
A Metallicity Map of M33
4 pages, 2 figures, uses asp2006.sty. To appear in the proceedings of the conference "Formation and Evolution of Galaxy Disks", Rome, Italy, 1-5 October 2007, eds. J. G. Funes and E. M. Corsini
null
null
null
astro-ph
null
We present initial results from the M33 Metallicity Project. Out of the thousands of cataloged HII regions in M33, only ~30 have electron-temperature based abundances in the literature. We have obtained Keck spectroscopy of a sample of ~200 HII regions in M33, with 61 detections of the [O III] 4363 A line that can be used for determining electron temperatures, including measurements at small galactocentric radii where auroral lines are generally difficult to detect. We find an oxygen abundance gradient of -0.027 +/- 0.012 dex/kpc, in agreement with infrared measurements of the neon abundance gradient but much shallower than most previous oxygen gradient measurements. There is substantial intrinsic scatter of 0.11 dex in the metallicity at any given radius in M33, which imposes a fundamental limit on the accuracy of gradient measurements that rely on small samples of objects. Finally, we present a two-dimensional map of oxygen abundances across the southern half of M33 and discuss the evidence for deviations from axisymmetry.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:02:44 GMT" } ]
2007-12-18T00:00:00
[ [ "Simon", "Joshua D.", "", "Caltech" ], [ "Rosolowsky", "Erik", "", "CfA" ] ]
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712.246
Yuk Tung Liu
Zachariah B. Etienne, Joshua A. Faber, Yuk Tung Liu, Stuart L. Shapiro, Keisuke Taniguchi, Thomas W. Baumgarte
Fully General Relativistic Simulations of Black Hole-Neutron Star Mergers
22 pages, 14 figures, fixed a few typos
Phys.Rev.D77:084002,2008
10.1103/PhysRevD.77.084002
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Black hole-neutron star (BHNS) binaries are expected to be among the leading sources of gravitational waves observable by ground-based detectors, and may be the progenitors of short-hard gamma ray bursts (SGRBs) as well. Here, we discuss our new fully general relativistic calculations of merging BHNS binaries, which use high-accuracy, low-eccentricity, conformal thin-sandwich configurations as initial data. Our evolutions are performed using the moving puncture method and include a fully relativistic, high-resolution shock-capturing hydrodynamics treatment. Focusing on systems in which the neutron star is irrotational and the black hole is nonspinning with a 3:1 mass ratio, we investigate the inspiral, merger, and disk formation in the system. We find that the vast majority of material is promptly accreted and no more than 3% of the neutron star's rest mass is ejected into a tenuous, gravitationally bound disk. We find similar results for mass ratios of 2:1 and 1:1, even when we reduce the NS compaction in the 2:1 mass ratio case. These ambient disks reach temperatures suitable for triggering SGRBs, but their masses may be too small to produce the required total energy output. We measure gravitational waveforms and compute the effective strain in frequency space, finding measurable differences between our waveforms and those produced by binary black hole mergers within the advanced LIGO band. These differences appear at frequencies corresponding to the emission that occurs when the NS is tidally disrupted and accreted by the black hole. The resulting information about the radius of the neutron star may be used to constrain the neutron star equation of state.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:06:23 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 22:07:35 GMT" }, { "version": "v3", "created": "Wed, 16 Jul 2008 20:02:13 GMT" } ]
2008-11-26T00:00:00
[ [ "Etienne", "Zachariah B.", "" ], [ "Faber", "Joshua A.", "" ], [ "Liu", "Yuk Tung", "" ], [ "Shapiro", "Stuart L.", "" ], [ "Taniguchi", "Keisuke", "" ], [ "Baumgarte", "Thomas W.", "" ] ]
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712.2461
Mukremin Kilic
Mukremin Kilic, Piotr M. Kowalski, Fergal Mullally, William T. Reach, and Ted von Hippel
The First Mid-Infrared Spectra of Cool White Dwarfs
ApJ, in press
null
10.1086/528705
null
astro-ph
null
We present the first mid-infrared spectra of two cool white dwarfs obtained with the Spitzer Space Telescope. We also present 3.5-8 micron photometry for 19 cool white dwarfs with 5000K < Teff < 9000K. We perform a detailed model atmosphere analysis of these white dwarfs by fitting their UBVRIJHK and Spitzer photometry with state-of-the-art model atmospheres, and demonstrate that the optical and infrared spectral energy distributions of cool white dwarfs are well reproduced by our grid of models. Our mid-IR photometry and 7.5-14.5 micron spectrum of WD0018-267 are consistent with a Teff = 5720K, pure hydrogen white dwarf model atmosphere. On the other hand, LHS 1126 remains peculiar with significant mid-IR flux deficits in all IRAC bands and a featureless spectrum in the 5.2-7.5 micron range. Even though this deficit is attributed to collision induced absorption (CIA) due to molecular hydrogen, the shape of the deficit cannot be explained with current CIA opacity calculations. The infrared portion of the LHS 1126 spectral energy distribution is best-fit with a power law index of -1.99; identical to a Rayleigh-Jeans spectrum. This argues that the deficit may be due to an unrecognized grey-like opacity source in the infrared.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:13:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Kilic", "Mukremin", "" ], [ "Kowalski", "Piotr M.", "" ], [ "Mullally", "Fergal", "" ], [ "Reach", "William T.", "" ], [ "von Hippel", "Ted", "" ] ]
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712.2462
Koichi Hamaguchi
K. Hamaguchi, S. Shirai and T. T. Yanagida
Determining the mass for an ultralight gravitino at LHC
16 pages, 10 figures
Phys.Lett.B663:86-94,2008
10.1016/j.physletb.2008.03.041
UT-07-38, IPMU-07-0015
hep-ph
null
In supersymmetric (SUSY) models with the gravitino being the lightest SUSY particle (LSP), the SUSY breaking scale (i.e., the gravitino mass) could be determined by measuring the lifetime of the next-to-lightest SUSY particle (NLSP). However, for an ultralight gravitino of mass of O(1) eV, which is favored cosmologically, the determination of the SUSY breaking scale, or the gravitino mass, is difficult because the NLSP decay length is too short to be measured directly. Recently we proposed a new determination of the gravitino mass by measuring a branching fraction of two decay modes of sleptons. In this paper, we investigate the prospects for determining the gravitino mass at LHC. For demonstration we take some explicit gauge-mediation models and show that the gravitino mass can be determined with an accuracy of a few 10% for an integrated luminosity 10-100 fb^{-1}.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:21:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Hamaguchi", "K.", "" ], [ "Shirai", "S.", "" ], [ "Yanagida", "T. T.", "" ] ]
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712.2463
Ludwik Turko
J. Cleymans, J. Str\"umpfer, and L. Turko
Exteneded Longitudinal Scaling and the Thermal Model
3 pages, 4 figures
Phys.Rev.C78:017901,2008
10.1103/PhysRevC.78.017901
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The property of extended longitudinal scaling of rapidity distributions was noticed recently over a broad range of beam energies. It is shown here that this property is consistent with predictions of the statistical thermal model up to the highest RHIC beam energies, however, we expect that at LHC energies the rapidity distribution of produced particles will violate extended longitudinal scaling.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:26:36 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 15:05:14 GMT" }, { "version": "v3", "created": "Sat, 29 Dec 2007 10:29:01 GMT" }, { "version": "v4", "created": "Wed, 16 Jul 2008 12:04:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Cleymans", "J.", "" ], [ "Strümpfer", "J.", "" ], [ "Turko", "L.", "" ] ]
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712.2464
Clinton Van Siclen
Clinton DeW. Van Siclen
Derivation of the residence time for kinetic Monte Carlo simulations
9 pages, 0 figures; 4 pages, improved format
null
null
INL/MIS-07-13603
physics.comp-ph
null
The kinetic Monte Carlo method is a standard approach for simulating physical systems whose dynamics are stochastic or that evolve in a probabilistic manner. Here we show how to calculate the system time for such simulations.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:48:11 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 23:07:53 GMT" } ]
2008-01-14T00:00:00
[ [ "Van Siclen", "Clinton DeW.", "" ] ]
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712.2465
Shiliang Li
Shiliang Li, Zahra Yamani, Hye Jung Kang, Kouji Segawa, Yoichi Ando, Xin Yao, H. A. Mook, Pengcheng Dai
Quantum Spin Excitations through the metal-to-insulator crossover in $Y Ba_2 Cu_3 O_{6+y}$
9 pages, 7 figures, accepted by Phys. Rev. B
Phys. Rev. B 77, 014523 (2008)
10.1103/PhysRevB.77.014523
null
cond-mat.supr-con
null
We use inelastic neutron scattering to study the temperature dependence of the spin excitations of a detwinned superconducting YBa$_2$Cu$_3$O$_{6.45}$ ($T_c=48$ K). In contrast to earlier work on YBa$_2$Cu$_3$O$_{6.5}$ ($T_c=58$ K), where the prominent features in the magnetic spectra consist of a sharp collective magnetic excitation termed ``resonance'' and a large ($\hbar\omega\approx 15$ meV) superconducting spin gap, we find that the spin excitations in YBa$_2$Cu$_3$O$_{6.45}$ are gapless and have a much broader resonance. Our detailed mapping of magnetic scattering along the $a^\ast$/$b^\ast$-axis directions at different energies reveals that spin excitations are unisotropic and consistent with the ``hourglass''-like dispersion along the $a^\ast$-axis direction near the resonance, but they are isotropic at lower energies. Since a fundamental change in the low-temperature normal state of YBa$_2$Cu$_3$O$_{6+y}$ when superconductivity is suppressed takes place at $y\sim0.5$ with a metal-to-insulator crossover (MIC), where the ground state transforms from a metallic to an insulating-like phase, our results suggest a clear connection between the large change in spin excitations and the MIC. The resonance therefore is a fundamental feature of metallic ground state superconductors and a consequence of high-$T_c$ superconductivity.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:29:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Shiliang", "" ], [ "Yamani", "Zahra", "" ], [ "Kang", "Hye Jung", "" ], [ "Segawa", "Kouji", "" ], [ "Ando", "Yoichi", "" ], [ "Yao", "Xin", "" ], [ "Mook", "H. A.", "" ], [ "Dai", "Pengcheng", "" ] ]
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712.2466
Gui-Yu Huang
Marcela Carena, Tao Han, Gui-Yu Huang, Carlos E.M. Wagner
Higgs Signal for h to aa at Hadron Colliders
Version to be published in JHEP. 20 pages, 5 figures
JHEP 0804:092,2008
10.1088/1126-6708/2008/04/092
FERMILAB-PUB-07-652-T, MADPH-07-1497, ANL-HEP-PR-07-106, EFI-07-39
hep-ph
null
We assess the prospect of observing a neutral Higgs boson at hadron colliders in its decay to two spin-zero states, a, for a Higgs mass of 90-130 GeV, when produced in association with a W or Z boson. Such a decay is allowed in extensions of the MSSM with CP-violating interactions and in the NMSSM, and can dominate Higgs boson final states, thereby evading the LEP constraints on standard Higgs boson production. The light spin-zero state decays primarily via a to bb and tau+tau-, so this signal channel retains features distinct from the main backgrounds. Our study shows that at the Tevatron, there may be potential to observe a few events in the bb tau+tau- or bbbb channels with relatively small background, although this observation would be statistically limited. At the LHC, the background problem is more severe, but with cross sections and integrated luminosities orders of magnitude larger than at the Tevatron, the observation of a Higgs boson in this decay mode would be possible. The channel h to aa to bbbb would provide a large statistical significance, with a signal-to-background ratio on the order of 1:2. In these searches, the main challenge would be to retain the adequate tagging efficiency of b's and tau's in the low p_T region.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 19:05:21 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 17:30:12 GMT" } ]
2009-02-18T00:00:00
[ [ "Carena", "Marcela", "" ], [ "Han", "Tao", "" ], [ "Huang", "Gui-Yu", "" ], [ "Wagner", "Carlos E. M.", "" ] ]
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712.2467
Jeffrey Andrews PhD
Jeff Andrews, Nihar Jindal, Martin Haenggi, Randy Berry, Syed Jafar, Dongning Guo, Sanjay Shakkottai, Robert Heath, Michael Neely, Steven Weber, Aylin Yener
Rethinking Information Theory for Mobile Ad Hoc Networks
Submitted to IEEE Communications Magazine
null
10.1109/MCOM.2008.4689214
null
cs.IT math.IT
null
The subject of this paper is the long-standing open problem of developing a general capacity theory for wireless networks, particularly a theory capable of describing the fundamental performance limits of mobile ad hoc networks (MANETs). A MANET is a peer-to-peer network with no pre-existing infrastructure. MANETs are the most general wireless networks, with single-hop, relay, interference, mesh, and star networks comprising special cases. The lack of a MANET capacity theory has stunted the development and commercialization of many types of wireless networks, including emergency, military, sensor, and community mesh networks. Information theory, which has been vital for links and centralized networks, has not been successfully applied to decentralized wireless networks. Even if this was accomplished, for such a theory to truly characterize the limits of deployed MANETs it must overcome three key roadblocks. First, most current capacity results rely on the allowance of unbounded delay and reliability. Second, spatial and timescale decompositions have not yet been developed for optimally modeling the spatial and temporal dynamics of wireless networks. Third, a useful network capacity theory must integrate rather than ignore the important role of overhead messaging and feedback. This paper describes some of the shifts in thinking that may be needed to overcome these roadblocks and develop a more general theory that we refer to as non-equilibrium information theory.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:35:46 GMT" } ]
2016-11-17T00:00:00
[ [ "Andrews", "Jeff", "" ], [ "Jindal", "Nihar", "" ], [ "Haenggi", "Martin", "" ], [ "Berry", "Randy", "" ], [ "Jafar", "Syed", "" ], [ "Guo", "Dongning", "" ], [ "Shakkottai", "Sanjay", "" ], [ "Heath", "Robert", "" ], [ "Neely", "Michael", "" ], [ "Weber", "Steven", "" ], [ "Yener", "Aylin", "" ] ]
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712.2468
Ishwaree Neupane
Ishwaree P. Neupane and Christoph Scherer
Inflation and Quintessence: Theoretical Approach of Cosmological Reconstruction
33 pages, several figures; significant extension (models confronted with data)
JCAP 0805:009,2008
10.1088/1475-7516/2008/05/009
null
astro-ph gr-qc hep-ph hep-th
null
In the first part of this paper, we outline the construction of an inflationary cosmology in the framework where inflation is described by a universally evolving scalar field, with the Lagrangian ${\cal L}_\phi=-{1/2}(\partial\phi)^2 -V(\phi)$. By considering a generic situation that inflaton attains a nearly constant velocity, during inflation, $m_P^{-1} (d\phi/dN)\equiv \alpha$ (where $N\equiv \ln a$ is the e-folding time), we find the conditions that have to satisfied by the (reconstructed) scalar potential to be consistent with the WMAP inflationary data. In the second part of this paper, we introduce a novel approach of constructing dark energy within the context of the standard scalar-tensor gravity. The assumption that a scalar field might roll with a nearly constant velocity, during inflation, can also be applied to {\it quintessence} or dark energy models. For the minimally coupled quintessence, $\alpha_Q\equiv dA(Q)/d(\kappa Q)=0$ (where $A(Q)$ is the standard matter-quintessence coupling), the dark energy equation of state in the range $-1\le w_{DE} < -0.82$ can be obtained for $0\le \alpha < 0.63$. For $\alpha<0.1$, the model allows for only modest evolution of dark energy density with redshift. The effect of the matter-quintessence coupling can be significant only if $|\alpha_Q| \gtrsim 0.1$, while a small coupling $|\alpha_Q|< 0.1$ will have almost no effect on cosmological parameters. The best fit value of $\alpha_Q$ in our model is found to be $\alpha_Q \simeq 0.06$, but it may contain significant numerical errors, viz $\alpha_Q=0.06\pm 0.35$, which thereby implies the consistency of our model with general relativity (for which $\alpha_Q=0$) at $1\sigma$ level.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 17:58:19 GMT" }, { "version": "v2", "created": "Sun, 11 May 2008 20:37:55 GMT" } ]
2009-12-15T00:00:00
[ [ "Neupane", "Ishwaree P.", "" ], [ "Scherer", "Christoph", "" ] ]
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712.2469
Zhenning Kong
Zhenning Kong and Edmund M. Yeh
Directed Percolation in Wireless Networks with Interference and Noise
null
null
null
null
cs.IT cs.NI math.IT math.PR
null
Previous studies of connectivity in wireless networks have focused on undirected geometric graphs. More sophisticated models such as Signal-to-Interference-and-Noise-Ratio (SINR) model, however, usually leads to directed graphs. In this paper, we study percolation processes in wireless networks modelled by directed SINR graphs. We first investigate interference-free networks, where we define four types of phase transitions and show that they take place at the same time. By coupling the directed SINR graph with two other undirected SINR graphs, we further obtain analytical upper and lower bounds on the critical density. Then, we show that with interference, percolation in directed SINR graphs depends not only on the density but also on the inverse system processing gain. We also provide bounds on the critical value of the inverse system processing gain.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:45:16 GMT" } ]
2007-12-18T00:00:00
[ [ "Kong", "Zhenning", "" ], [ "Yeh", "Edmund M.", "" ] ]
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712.247
Dongming Mei
D.-M. Mei, Z.-B. Yin, L. C. Stonehill, and A. Hime
A Model of Nuclear Recoil Scintillation Efficiency in Noble Liquids
7 pages, 10 figures
Astropart.Phys.30:12-17,2008
10.1016/j.astropartphys.2008.06.001
null
nucl-ex astro-ph
null
Scintillation efficiency of low-energy nuclear recoils in noble liquids plays a crucial role in interpreting results from some direct searches for Weakly Interacting Massive Particle (WIMP) dark matter. However, the cause of a reduced scintillation efficiency relative to electronic recoils in noble liquids remains unclear at the moment. We attribute such a reduction of scintillation efficiency to two major mechanisms: 1) energy loss and 2) scintillation quenching. The former is commonly described by Lindhard's theory and the latter by Birk's saturation law. We propose to combine these two to explain the observed reduction of scintillation yield for nuclear recoils in noble liquids. Birk's constants $kB$ for argon, neon and xenon determined from existing data are used to predict noble liquid scintillator's response to low-energy nuclear recoils and low-energy electrons. We find that energy loss due to nuclear stopping power that contributes little to ionization and excitation is the dominant reduction mechanism in scintillation efficiency for nuclear recoils, but that significant additional quenching results from the nonlinear response of scintillation to the ionization density.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 21:58:19 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 20:56:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Mei", "D. -M.", "" ], [ "Yin", "Z. -B.", "" ], [ "Stonehill", "L. C.", "" ], [ "Hime", "A.", "" ] ]
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712.2471
Graeme Smith
Graeme Smith and John A. Smolin
Additive Extensions of a Quantum Channel
6 pages, one figure
Proceedings of the IEEE Information Theory Workshop 2008. pp 368-372
10.1109/ITW.2008.4578688
null
quant-ph
null
We study extensions of a quantum channel whose one-way capacities are described by a single-letter formula. This provides a simple technique for generating powerful upper bounds on the capacities of a general quantum channel. We apply this technique to two qubit channels of particular interest--the depolarizing channel and the channel with independent phase and amplitude noise. Our study of the latter demonstrates that the key rate of BB84 with one-way post-processing and quantum bit error rate q cannot exceed H(1/2-2q(1-q)) - H(2q(1-q)).
[ { "version": "v1", "created": "Fri, 14 Dec 2007 22:53:41 GMT" } ]
2009-02-20T00:00:00
[ [ "Smith", "Graeme", "" ], [ "Smolin", "John A.", "" ] ]
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712.2472
Manuel Tiglio
Manuel Tiglio, Lawrence Kidder and Saul Teukolsky
High accuracy simulations of Kerr tails: coordinate dependence and higher multipoles
null
Class.Quant.Grav.25:105022,2008
10.1088/0264-9381/25/10/105022
null
gr-qc
null
We investigate the late time behavior of a scalar field on a fixed Kerr background using a 2+1 dimensional pseudospectral evolution code. We compare evolutions of pure axisymmetric multipoles in both Kerr-Schild and Boyer-Lindquist coordinates. We find that the late-time power-law decay rate depends upon the slicing of the background, confirming previous theoretical predictions for those decay rates. The accuracy of the numerical evolutions is sufficient to decide unambiguously between competing claims in the literature.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 17:51:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Tiglio", "Manuel", "" ], [ "Kidder", "Lawrence", "" ], [ "Teukolsky", "Saul", "" ] ]
[ 0.0340311788, 0.0871041939, 0.039426364, -0.0243271664, 0.021409858, 0.0500458516, -0.0040738541, 0.0156362765, -0.0575161092, 0.1274338216, -0.0343241282, -0.0324443579, -0.1274338216, -0.0177479666, 0.0309063643, 0.1410072297, 0.0576137602, -0.0575161092, 0.0755326152, 0.0191638991, -0.0980410427, -0.1642480344, 0.0488008074, -0.0017821206, -0.015782753, -0.0427953042, 0.049923785, -0.0239365641, 0.0536100902, -0.0372048169, -0.010808683, -0.038254559, -0.1639550924, -0.1095637903, -0.1151298657, 0.1025329605, 0.0444309488, 0.0863718167, -0.0793409795, -0.0559537001, 0.0025221277, -0.0055447142, -0.132999897, 0.0670370236, -0.0178334117, -0.0685506091, -0.012609113, 0.0134513481, 0.0887642503, 0.0045285393, -0.1088802367, 0.0498749614, 0.001468571, 0.0019667409, -0.1269455701, -0.0116509181, 0.0154531822, 0.0147574227, 0.0293927826, -0.0618615523, -0.0079707168, -0.0431859083, -0.0597132444, -0.0218859054, -0.099164024, -0.0727984011, -0.0322490558, -0.0206774808, 0.0253891144, 0.0829052255, -0.0435276814, 0.0288068801, -0.0449680276, 0.0832469985, 0.0613244772, -0.0478731282, 0.0130607458, 0.0713336468, 0.028294215, 0.017284127, 0.0057674791, 0.0065486827, 0.0534636155, 0.0022764758, 0.0079402011, -0.0729448795, 0.0766067728, 0.0021650933, -0.0846141055, 0.013671061, 0.004766562, 0.0720172003, 0.0203845296, 0.0027067482, 0.0815869421, -0.0415258482, 0.0856394321, -0.0630333573, 0.0920843631, 0.0046322928, -0.0262435563, 0.1053648219, 0.0320293456, -0.0629845336, 0.1459874064, -0.0122002019, -0.0415746756, 0.0078059318, -0.0633263066, 0.036033012, 0.0148916915, 0.0211779382, -0.1056577712, 0.0115227522, 0.0150015485, -0.0760696903, -0.080219835, 0.0275374241, -0.0631798357, 0.0636192635, -0.0288801175, -0.0646934137, 0.0430882573, 0.0632286593, 0.0574672818, -0.0521453358, -0.0249985121, -0.0650840178, -0.1305586398, 0.044601839, 0.0003066834, -0.068355307, 0.010595073, -0.0581508353, -0.0376930684, 0.1152275205, 0.0307598878, 0.0279036127, 0.0736772567, 0.0269026961, 0.0274153613, 0.1355388165, 0.0210070498, -0.0363992006, 0.0270491708, 0.1332928538, -0.0686482564, 0.0351053327, 0.0081721209, -0.0026594487, -0.0374245308, 0.0416479111, 0.0089777373, -0.0128654456, -0.0697712377, 0.0236924384, 0.0394507758, -0.0662069991, -0.0203112904, -0.0614709519, -0.0302472226, 0.0127555886, -0.1185476333, 0.0522918105, -0.0003335754, -0.0094110612, -0.0206286553, -0.0075312899, -0.1098567471, -0.1600490659, 0.0567349046, -0.092719093, -0.0721636713, -0.0374733545, 0.0396460779, 0.0776320994, 0.0581996627, -0.0814404637, -0.0848094076, -0.0164907183, -0.019383613, 0.0285383407, 0.0299298596, 0.0203845296, -0.0568325557, 0.0731401816, -0.020445561, 0.1088802367, -0.0141104888, 0.0061916481, 0.0489472821, 0.1083919853, 0.0484346189, 0.0633751377, -0.0741655082, -0.0731401816, -0.0046841693, -0.0038327798, -0.1331951916, 0.113372162, 0.1003846526, 0.074946709, 0.0373268798, -0.0406714082, 0.0114128953, -0.0391578265, 0.0244492292, 0.039426364, -0.1362223625, -0.0222398881, 0.0615197755, 0.0182484258, 0.0662558228, 0.0306866504, -0.0674764514, -0.0500946753, -0.138077721, -0.0038571924, -0.0145499157, 0.0633263066, -0.0836376026, 0.0860788599, 0.0324931853, 0.1179617271, 0.0866159424, 0.0490937568, 0.1028259099, -0.0348367952, 0.0269271079, -0.0006297691, 0.0258285403, 0.1139580607, 0.0490937568, 0.0167592559, 0.0277083125, -0.0786574259, -0.0136954738, 0.0098016625, -0.0701618418, -0.1128839105, 0.0109673645, -0.0055508171, -0.0339335278, 0.0627404079, -0.0491914079, -0.0142081389, -0.0187366772, -0.0084345564, 0.0305645876, -0.081049867, 0.0056637255, 0.0768508986, -0.0626915842, 0.0077876225, -0.0004272207, 0.044089172 ]
712.2473
Ian Roederer
Ian U. Roederer, James E. Lawler, Christopher Sneden, John J. Cowan, Jennifer S. Sobeck, Catherine A. Pilachowski
Europium, Samarium, and Neodymium Isotopic Fractions in Metal-Poor Stars
40 pages, 16 figures. Accepted for publication in ApJ. Full versions of tables 4 and 5 are available from the first author upon request
AIP Conf.Proc.990:172-174,2008
10.1063/1.2905533
null
astro-ph
null
We have derived isotopic fractions of europium, samarium, and neodymium in two metal-poor giants with differing neutron-capture nucleosynthetic histories. These isotopic fractions were measured from new high resolution (R ~ 120,000), high signal-to-noise (S/N ~ 160-1000) spectra obtained with the 2dCoude spectrograph of McDonald Observatory's 2.7m Smith telescope. Synthetic spectra were generated using recent high-precision laboratory measurements of hyperfine and isotopic subcomponents of several transitions of these elements and matched quantitatively to the observed spectra. We interpret our isotopic fractions by the nucleosynthesis predictions of the stellar model, which reproduces s-process nucleosynthesis from the physical conditions expected in low-mass, thermally-pulsing stars on the AGB, and the classical method, which approximates s-process nucleosynthesis by a steady neutron flux impinging upon Fe-peak seed nuclei. Our Eu isotopic fraction in HD 175305 is consistent with an r-process origin by the classical method and is consistent with either an r- or an s-process origin by the stellar model. Our Sm isotopic fraction in HD 175305 suggests a predominantly r-process origin, and our Sm isotopic fraction in HD 196944 is consistent with an s-process origin. The Nd isotopic fractions, while consistent with either r-process or s-process origins, have very little ability to distinguish between any physical values for the isotopic fraction in either star. This study for the first time extends the n-capture origin of multiple rare earths in metal-poor stars from elemental abundances to the isotopic level, strengthening the r-process interpretation for HD 175305 and the s-process interpretation for HD196944.
[ { "version": "v1", "created": "Sun, 16 Dec 2007 01:59:34 GMT" } ]
2011-07-19T00:00:00
[ [ "Roederer", "Ian U.", "" ], [ "Lawler", "James E.", "" ], [ "Sneden", "Christopher", "" ], [ "Cowan", "John J.", "" ], [ "Sobeck", "Jennifer S.", "" ], [ "Pilachowski", "Catherine A.", "" ] ]
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712.2474
Natalie Strand
Natalie E. Strand, Robert J. Brunner, Adam D. Myers
AGN Environments in the Sloan Digital Sky Survey I: Dependence on Type, Redshift, and Luminosity
30 pages, 9 figures. Major revisions made for current version. Some content in previous version has been removed to refocus content on redshift and type effects. This content will be deferred to later works
null
10.1086/592099
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore how the local environment is related to the redshift, type, and luminosity of active galactic nuclei (AGN). Recent simulations and observations are converging on the view that the extreme luminosity of quasars is fueled in major mergers of gas-rich galaxies. In such a picture, quasars are expected to be located in regions with a higher density of galaxies on small scales where mergers are more likely to take place. However, in this picture, the activity observed in low-luminosity AGN is due to secular processes that are less dependent on the local galaxy density. To test this hypothesis, we compare the local photometric galaxy density on kiloparsec scales around spectroscopic Type I and Type II quasars to the local density around lower luminosity spectroscopic Type I and Type II AGN. To minimize projection effects and evolution in the photometric galaxy sample we use to characterize AGN environments, we place our random control sample at the same redshift as our AGN and impose a narrow redshift window around both the AGN and control targets. We find that higher luminosity AGN have more overdense environments compared to lower luminosity AGN on all scales out to our $2\Mpchseventy$ limit. Additionally, in the range $0.3\leqslant z\leqslant 0.6$, Type II quasars have similarly overdense environments to those of bright Type I quasars on all scales out to our $2\Mpchseventy$ limit, while the environment of dimmer Type I quasars appears to be less overdense than the environment of Type II quasars. We see increased overdensity for Type II AGN compared to Type I AGN on scales out to our limit of $2\Mpchseventy$ in overlapping redshift ranges. We also detect marginal evidence for evolution in the number of galaxies within $2\Mpchseventy$ of a quasar with redshift.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 23:02:37 GMT" }, { "version": "v2", "created": "Thu, 24 Jul 2008 17:11:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Strand", "Natalie E.", "" ], [ "Brunner", "Robert J.", "" ], [ "Myers", "Adam D.", "" ] ]
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712.2475
Debashree Ghosh
Debashree Ghosh, Johannes Hachmann, Takeshi Yanai, Garnet K.-L. Chan
Orbital Optimization in the Density Matrix Renormalization Group, with applications to polyenes and \beta-carotene
16 pages, 8 figures
null
10.1063/1.2883976
null
cond-mat.str-el
null
In previous work we have shown that the Density Matrix Renormalization Group (DMRG) enables near-exact calculations in active spaces much larger than are possible with traditional Complete Active Space algorithms. Here, we implement orbital optimisation with the Density Matrix Renormalization Group to further allow the self-consistent improvement of the active orbitals, as is done in the Complete Active Space Self-Consistent Field (CASSCF) method. We use our resulting DMRGCASSCF method to study the low-lying excited states of the all-trans polyenes up to C24H26 as well as \beta-carotene, correlating with near-exact accuracy the optimised complete \pi-valence space with up to 24 active electrons and orbitals, and analyse our results in the light of the recent discovery from Resonance Raman experiments of new optically dark states in the spectrum.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 23:07:05 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 21:51:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Ghosh", "Debashree", "" ], [ "Hachmann", "Johannes", "" ], [ "Yanai", "Takeshi", "" ], [ "Chan", "Garnet K. -L.", "" ] ]
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712.2476
Krzysztof Kurdyka
Toshizumi Fukui, Krzysztof Kurdyka (LM-Savoie), Laurentiu Paunescu
Tame nonsmooth inverse mapping theorems
19 pages
null
null
null
math.GT
null
We give several versions of local and global inverse mapping theorem for tame non necessarily smooth, mappings. Here tame mapping means a mapping which is subanalytic or, more generally, definable in some o-minimal structure. Our sufficient conditions are formulated in terms of various properties (convexity, positivity of some principal minors, contractiblity) of the space of Jacobi's matrices at smooth points.
[ { "version": "v1", "created": "Mon, 17 Dec 2007 19:29:09 GMT" } ]
2007-12-18T00:00:00
[ [ "Fukui", "Toshizumi", "", "LM-Savoie" ], [ "Kurdyka", "Krzysztof", "", "LM-Savoie" ], [ "Paunescu", "Laurentiu", "" ] ]
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712.2477
Robert Brandenberger
Bin Chen, Yi Wang, Wei Xue, Robert Brandenberger
String Gas Cosmology and Non-Gaussianities
17 pages, 1 figure 4 clarifying sentences added
null
null
CAS-KITPC/ITP-023
hep-th
null
Recently it has been shown that string gas cosmology, an alternative model of the very early universe which does not involve a period of cosmological inflation, can give rise to an almost scale invariant spectrum of metric perturbations. Here we calculate the non-Gaussianities of the spectrum of cosmological fluctuations in string gas cosmology, and find that these non-Gaussianities depend linearly on the wave number and that their amplitude depends sensitively on the string scale. If the string scale is at the TeV scale, string gas cosmology could lead to observable non-Gaussianities, if it is close to the Planck scale, then the non-Gaussianities on current cosmological scales are negligible.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 23:13:19 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 03:20:33 GMT" } ]
2008-03-05T00:00:00
[ [ "Chen", "Bin", "" ], [ "Wang", "Yi", "" ], [ "Xue", "Wei", "" ], [ "Brandenberger", "Robert", "" ] ]
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712.2478
Yang Liu
Yang Liu, Jon Sauer and Robert Dutton
Effect of Electro-Diffusion Current Flow on Electrostatic Screening in Aqueous Pores
null
null
10.1063/1.2906327
null
physics.bio-ph physics.ins-det
null
A numerical study within the framework of the Poisson-Nernst-Planck equations is conducted to investigate electrostatic screening of charged bio-molecules within synthetic pores having diameters of at least 10 Debye lengths. We show that with external biases, the bio-molecule charge is only partially screened due to the presence of electrodiffusion current flow. This is considerably different from the equilibrium Debye-Huckel screening behavior and will result in long-range electrostatic interactions. The potential application to direct bio-molecule charge sensing is also discussed.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 23:35:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Yang", "" ], [ "Sauer", "Jon", "" ], [ "Dutton", "Robert", "" ] ]
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