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711.4208
Noel Malod-Dognin
Rumen Andonov (IRISA), Nicola Yanev, No\"el Malod-Dognin (IRISA)
Towards Structural Classification of Proteins based on Contact Map Overlap
null
null
null
null
q-bio.QM
null
A multitude of measures have been proposed to quantify the similarity between protein 3-D structure. Among these measures, contact map overlap (CMO) maximization deserved sustained attention during past decade because it offers a fine estimation of the natural homology relation between proteins. Despite this large involvement of the bioinformatics and computer science community, the performance of known algorithms remains modest. Due to the complexity of the problem, they got stuck on relatively small instances and are not applicable for large scale comparison. This paper offers a clear improvement over past methods in this respect. We present a new integer programming model for CMO and propose an exact B &B algorithm with bounds computed by solving Lagrangian relaxation. The efficiency of the approach is demonstrated on a popular small benchmark (Skolnick set, 40 domains). On this set our algorithm significantly outperforms the best existing exact algorithms, and yet provides lower and upper bounds of better quality. Some hard CMO instances have been solved for the first time and within reasonable time limits. From the values of the running time and the relative gap (relative difference between upper and lower bounds), we obtained the right classification for this test. These encouraging result led us to design a harder benchmark to better assess the classification capability of our approach. We constructed a large scale set of 300 protein domains (a subset of ASTRAL database) that we have called Proteus 300. Using the relative gap of any of the 44850 couples as a similarity measure, we obtained a classification in very good agreement with SCOP. Our algorithm provides thus a powerful classification tool for large structure databases.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:36:32 GMT" } ]
2009-04-20T00:00:00
[ [ "Andonov", "Rumen", "", "IRISA" ], [ "Yanev", "Nicola", "", "IRISA" ], [ "Malod-Dognin", "Noël", "", "IRISA" ] ]
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711.4209
Yakov Itin
Yakov Itin (Institute of Mathematics, Hebrew University of Jerusalem, and Jerusalem College of Technology)
Coframe geometry and gravity
to be published in "Classical and Quantum Gravity Research Progress", Nova Science Publishers, Inc
null
null
null
gr-qc
null
The possible extensions of GR for description of fermions on a curved space, for supergravity and for loop quantum gravity require a richer set of 16 independent variables. These variables can be assembled in a coframe field, i.e., a local set of four linearly independent 1-forms. In the ordinary formulation, the coframe gravity does not have any connection to a specific geometry even being constructed from the geometrical meaningful objects. A geometrization of the coframe gravity is an aim of this paper. We construct a complete class of the coframe connections which are linear in the first order derivatives of the coframe field on an $n$ dimensional manifolds with and without a metric. The subclasses of the torsion-free, metric-compatible and flat connections are derived. We also study the behavior of the geometrical structures under local transformations of the coframe. The remarkable fact is an existence of a subclass of connections which are invariant when the infinitesimal transformations satisfy the Maxwell-like system of equations. In the framework of the coframe geometry construction, we propose a geometrical action for the coframe gravity. It is similar to the Einstein-Hilbert action of GR, but the scalar curvature is constructed from the general coframe connection. We show that this geometric Lagrangian is equivalent to the coframe Lagrangian up to a total derivative term. Moreover there is a family of coframe connections which Lagrangian does not include the higher order terms at all. In this case, the equivalence is complete.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:07:24 GMT" } ]
2019-08-12T00:00:00
[ [ "Itin", "Yakov", "", "Institute of Mathematics, Hebrew University of Jerusalem,\n and Jerusalem College of Technology" ] ]
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711.421
Jeffrey Burdges
Jeffrey Burdges
Signalizers and balance in groups of finite Morley rank
null
null
null
null
math.LO math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that a minimal counter example to the Cherlin-Zilber Algebraicity Conjecture for simple groups of finite Morley rank has Prufer 2-rank at most two. This article covers the signalizer functor theory and identifies the groups of Lie rank at least three; leaving the uniqueness case analysis to previous articles. This result signifies the end of the general methods used to handle large groups; hereafter each individual group PSL$_2$, PSL$_3$, PSp$_4$, and G$_2$ will require its own identification theorem.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 09:59:07 GMT" }, { "version": "v2", "created": "Fri, 28 Nov 2008 18:58:57 GMT" } ]
2008-11-28T00:00:00
[ [ "Burdges", "Jeffrey", "" ] ]
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711.4211
Alexandre Losev
A. Losev
The Penrose Lattice revisited
6 pages 2 figures
null
null
null
cond-mat.other
null
A recursive scheme relying on decagons is used to generate Penrose-like sublattices or tilings. Its relevance for understanding structures with non-crystallographic symmetry is discussed.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:00:00 GMT" } ]
2007-11-28T00:00:00
[ [ "Losev", "A.", "" ] ]
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711.4212
Jaromir Fiurasek
Jaromir Fiurasek, Nicolas J. Cerf
Quantum cloning a pair of orthogonally polarized photons with linear optics
6 pages, 2 figures, RevTeX4
Phys. Rev. A 77, 052308 (2008).
10.1103/PhysRevA.77.052308
null
quant-ph
null
A linear optical probabilistic scheme for the optimal cloning of a pair of orthogonally-polarized photons is devised, based on single- and two-photon interferences. It consists in a partial symmetrization device, realized with a modified unbalanced Mach-Zehnder interferometer, followed by two independent Hong-Ou-Mandel interferometers. This scheme has the advantage that it enables quantum cloning without the need for stimulated amplification in a nonlinear medium. It can also be modified so to make an optical two-qubit partial SWAP gate, thereby providing a potentially useful tool to linear optics quantum computing.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:00:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Fiurasek", "Jaromir", "" ], [ "Cerf", "Nicolas J.", "" ] ]
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711.4213
Yoichi Ando
Yoichi Ando (Osaka University)
Implication of the Mott-limit violation in high-Tc cuprates
5 pages, 5 figures; manuscript for the Proceedings of SNS2007 to be published as a Special Issue of the Journal of Physics and Chemistry of Solids
null
10.1016/j.jpcs.2008.06.074
null
cond-mat.supr-con cond-mat.str-el
null
The Fermi arc is a striking manifestation of the strong-correlation physics in high-T_c cuprates. In this paper, implications of the metallic transport in the lightly hole-doped regime of the cuprates, where the Fermi arcs are found, are examined in conjunction with competing interpretations of the Fermi arcs in terms of small hole pockets or a large underlying Fermi surface. It is discussed that the latter picture provides a more natural understanding of the metallic transport in view of the Mott-limit argument. Furthermore, it is shown that a suitable modeling of the Fermi arcs in the framework of the Boltzmann theory allows us to intuitively understand why the transport properties are apparently determined by a "small" carrier density even when the underlying Fermi surface, and hence k_F, is large.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:10:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Ando", "Yoichi", "", "Osaka University" ] ]
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711.4214
Yoichi Ando
Yoichi Ando (Osaka Univ.), X. F. Sun (USTC), and Kouji Segawa (Osaka Univ.)
Pitfalls in the analysis of low-temperature thermal conductivity of high-Tc cuprates
4 pages, 1 figure; manuscript for the Proceedings of LEHTSC2007 to be published in Journal of Physics: Conference Series
J. Phys.: Conference Series 108, 012001 (2008)
10.1088/1742-6596/108/1/012001
null
cond-mat.supr-con cond-mat.str-el
null
Recently, it was proposed that phonons are specularly reflected below about 0.5 K in ordinary single-crystal samples of high-T_c cuprates, and that the low-temperature thermal conductivity should be analyzed by fitting the data up to 0.5 K using an arbitrary power law. Such an analysis yields a result different from that obtained from the conventional analysis, in which the fitting is usually restricted to a region below 0.15 K. Here we show that the proposed new analysis is most likely flawed, because the specular phonon reflection means that the phonon mean free path \ell gets LONGER than the mean sample width, while the estimated \ell is actually much SHORTER than the mean sample width above 0.15 K.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:10:57 GMT" } ]
2015-05-13T00:00:00
[ [ "Ando", "Yoichi", "", "Osaka Univ." ], [ "Sun", "X. F.", "", "USTC" ], [ "Segawa", "Kouji", "", "Osaka\n Univ." ] ]
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711.4215
Lukas Jelinek
J. D. Baena, L. Jelinek, R. Marques, M. Silveirinha
Unified Homogenization Theory for Magnetoinductive and Electromagnetic Waves in Split Ring Metamaterials
4 pages, 3 figures
Phys. Rev. A 78, 013842, 2008
10.1103/PhysRevA.78.013842
null
physics.optics
null
A unified homogenization procedure for split ring metamaterials taking into account time and spatial dispersion is introduced. The procedure is based on two coupled systems of equations. The first one comes from an approximation of the metamaterial as a cubic arrangement of coupled LC circuits, giving the relation between currents and local magnetic field. The second equation comes from macroscopic Maxwell equations, and gives the relation between the macroscopic magnetic field and the average magnetization of the metamaterial. It is shown that electromagnetic and magnetoinductive waves propagating in the metamaterial are obtained from this analysis. Therefore, the proposed time and spatially dispersive permeability accounts for the characterization of the complete spectrum of waves of the metamaterial. Finally, it is shown that the proposed theory is in good quantitative and qualitative agreement with full wave simulations.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:12:42 GMT" } ]
2014-09-10T00:00:00
[ [ "Baena", "J. D.", "" ], [ "Jelinek", "L.", "" ], [ "Marques", "R.", "" ], [ "Silveirinha", "M.", "" ] ]
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711.4216
Francesco Fontani
F. Fontani, P. Caselli, T.L. Bourke, R. Cesaroni, J. Brand
Highly deuterated pre-stellar cores in a high-mass star formation region
4 pages, 2 figures, accepted for publication in Astronomy and Astrophysics
null
10.1051/0004-6361:20078973
null
astro-ph
null
We have observed the deuterated gas in the high-mass star formation region IRAS 05345+3157 at high-angular resolution, in order to determine the morphology and the nature of such gas. We have mapped the N2H+ (1-0) line with the Plateau de Bure Interferometer, and the N2D+ (3-2) and N2H+ (3-2) lines with the Submillimeter Array. The N2D+ (3-2) integrated emission is concentrated in two condensations, with masses of 2-3 and 9 M_sun and diameters of 0.05 and 0.09 pc, respectively. The high deuterium fractionation (0.1) and the line parameters in the N2D+ condensations indicate that they are likely low- to intermediate-mass pre-stellar cores, even though other scenarios are possible.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:17:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Fontani", "F.", "" ], [ "Caselli", "P.", "" ], [ "Bourke", "T. L.", "" ], [ "Cesaroni", "R.", "" ], [ "Brand", "J.", "" ] ]
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711.4217
Kees Middelburg
J. A. Bergstra, C. A. Middelburg
Instruction sequences with dynamically instantiated instructions
25 pages; phrasing improved
Fundamenta Informaticae, 96(1--2):27--48, 2009
10.3233/FI-2009-165
PRG0710
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study sequential programs that are instruction sequences with dynamically instantiated instructions. We define the meaning of such programs in two different ways. In either case, we give a translation by which each program with dynamically instantiated instructions is turned into a program without them that exhibits on execution the same behaviour by interaction with some service. The complexity of the translations differ considerably, whereas the services concerned are equally simple. However, the service concerned in the case of the simpler translation is far more powerful than the service concerned in the other case.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:24:34 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 08:06:27 GMT" }, { "version": "v3", "created": "Wed, 2 Jul 2008 08:08:28 GMT" }, { "version": "v4", "created": "Tue, 4 Aug 2009 06:37:50 GMT" } ]
2010-01-12T00:00:00
[ [ "Bergstra", "J. A.", "" ], [ "Middelburg", "C. A.", "" ] ]
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711.4218
Ingrid Van Keilegom
Ingrid Van Keilegom, C\'esar S\'anchez Sellero, Wenceslao Gonz\'alez Manteiga
Empirical likelihood based testing for regression
Published in at http://dx.doi.org/10.1214/07-EJS152 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Electronic Journal of Statistics 2008, Vol. 2, 581-604
10.1214/07-EJS152
IMS-EJS-EJS_2007_152
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider a random vector $(X,Y)$ and let $m(x)=E(Y|X=x)$. We are interested in testing $H_0:m\in {\cal M}_{\Theta,{\cal G}}=\{\gamma(\cdot,\theta,g):\theta \in \Theta,g\in {\cal G}\}$ for some known function $\gamma$, some compact set $\Theta \subset $IR$^p$ and some function set ${\cal G}$ of real valued functions. Specific examples of this general hypothesis include testing for a parametric regression model, a generalized linear model, a partial linear model, a single index model, but also the selection of explanatory variables can be considered as a special case of this hypothesis. To test this null hypothesis, we make use of the so-called marked empirical process introduced by \citeD and studied by \citeSt for the particular case of parametric regression, in combination with the modern technique of empirical likelihood theory in order to obtain a powerful testing procedure. The asymptotic validity of the proposed test is established, and its finite sample performance is compared with other existing tests by means of a simulation study.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:34:14 GMT" }, { "version": "v2", "created": "Wed, 16 Jul 2008 14:14:09 GMT" } ]
2008-07-16T00:00:00
[ [ "Van Keilegom", "Ingrid", "" ], [ "Sellero", "César Sánchez", "" ], [ "Manteiga", "Wenceslao González", "" ] ]
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711.4219
Kluson Josef
J. Kluson
Fundamental String and D1-brane in I-brane Background
16 pages, reference added
JHEP0801:045,2008
10.1088/1126-6708/2008/01/045
null
hep-th
null
This paper is devoted to the study of dynamics of fundamental string and D1-brane in I-brane background. We consider configurations where string and D1-brane uniformly wrap transverse spheres. We explicitly determine corresponding conserved charges and find relations between them.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:51:17 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 13:25:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Kluson", "J.", "" ] ]
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711.422
David Gruenewald
David Gruenewald
Computing Humbert Surfaces
7 pages
null
null
null
math.NT math.AG
null
We describe an algorithm which computes components of Humbert surfaces in terms of Rosenhain invariants, based on Runge's method
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:06:38 GMT" } ]
2007-11-28T00:00:00
[ [ "Gruenewald", "David", "" ] ]
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711.4221
Matteo Cirillo Prof.
F. Stella, M. Casalboni, M. Cirillo, V. Merlo, C. Palazzesi, G. P. Pepe, P. Prosposito, and M. Salvato
Integrating Superconductive and Optical Circuits
Document composed of 7 pages of text and 3 figures
null
10.1063/1.2931700
null
cond-mat.supr-con cond-mat.mtrl-sci
null
We have integrated on oxidized silicon wafers superconductive films and Josephson junctions along with sol-gel optical channel waveguides. The fabrication process is carried out in two steps that result to be solid and non-invasive. It is demonstrated that 660 nm light, coupled from an optical fibre into the channel sol-gel waveguide, can be directed toward superconducting tunnel junctions whose current-voltage characteristics are affected by the presence of the radiation. The dependence of the change in the superconducting energy gap under optical pumping is discussed in terms of a non-equilibrium superconductivity model.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 10:56:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Stella", "F.", "" ], [ "Casalboni", "M.", "" ], [ "Cirillo", "M.", "" ], [ "Merlo", "V.", "" ], [ "Palazzesi", "C.", "" ], [ "Pepe", "G. P.", "" ], [ "Prosposito", "P.", "" ], [ "Salvato", "M.", "" ] ]
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711.4222
Carlo Giunti
Mario A. Acero, Carlo Giunti, Marco Laveder
Limits on nu_e and anti-nu_e disappearance from Gallium and reactor experiments
21 pages. Final version to be published in Phys. Rev. D
Phys.Rev.D78:073009,2008
10.1103/PhysRevD.78.073009
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The deficit observed in the Gallium radioactive source experiments is interpreted as a possible indication of the disappearance of electron neutrinos. In the effective framework of two-neutrino mixing we obtain $\sin^{2}2\vartheta \gtrsim 0.03$ and $\Delta{m}^{2} \gtrsim 0.1 \text{eV}^{2}$. The compatibility of this result with the data of the Bugey and Chooz reactor short-baseline antineutrino disappearance experiments is studied. It is found that the Bugey data present a hint of neutrino oscillations with $0.02 \lesssim \sin^{2}2\vartheta \lesssim 0.08$ and $\Delta{m}^{2} \approx 1.8 \text{eV}^{2}$, which is compatible with the Gallium allowed region of the mixing parameters. This hint persists in the combined analyses of Bugey and Chooz data, of Gallium and Bugey data, and of Gallium, Bugey, and Chooz data.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:11:33 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 10:03:40 GMT" }, { "version": "v3", "created": "Wed, 17 Sep 2008 09:32:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Acero", "Mario A.", "" ], [ "Giunti", "Carlo", "" ], [ "Laveder", "Marco", "" ] ]
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711.4223
Pelaez
J.R. Pel\'aez and G. R\'ios
Scalar mesons from Unitarized Chiral Perturbation Theory: N_c and quark mass dependences
Invited talk to the 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, Sept. 10th-14th 2007 (MENU 2007), Juelich, Germany. 10 pages, 3 figures
ECONFC070910:157,2007
null
null
hep-ph
null
We review recent studies of light scalar meson properties by means of unitarization techniques, obtained from dispersion theory, and applied to the Chiral Perturbation Theory expansion. In particular, light scalars do not follow the N_c dependence of $\bar q q$ states although a subdominant quark-antiquark component may be observed to arise for the f_0(600) around 1 GeV, where another quark-antiquark multiplet is believed to exist. Finally, we present our preliminary results on the quark mass dependence of the f_0(600) and rho(770) resonances.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:32:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Peláez", "J. R.", "" ], [ "Ríos", "G.", "" ] ]
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711.4224
Pop Adrian
Pop Adrian Alin
Perturbations for the Coulomb - Kepler problem on de Sitter space-time
6 pages
null
null
null
gr-qc
null
In the Schrodinger picture of the Dirac quantum mechanics, defined in charts with spatially flat Robertson-Walker metrics and Cartesian coordinates the perturbation theory is applied to the interacting part of the Hamiltonian operator produced by the minimal coupling with the gravitational field. First and second order perturbations are computed.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:12:10 GMT" } ]
2007-11-28T00:00:00
[ [ "Alin", "Pop Adrian", "" ] ]
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711.4225
Tom Fischer
Tom Fischer
Consumption processes and positively homogeneous projection properties
24 pages, 2 figures
Fischer, T., 2008. Consumption processes and positively homogeneous projection properties. Finance & Stochastics 12 (3), 357-380
10.1007/s00780-008-0064-x
null
q-fin.GN math.OC
null
We constructively prove the existence of time-discrete consumption processes for stochastic money accounts that fulfill a pre-specified positively homogeneous projection property (PHPP) and let the account always be positive and exactly zero at the end. One possible example is consumption rates forming a martingale under the above restrictions. For finite spaces, it is shown that any strictly positive consumption strategy with restrictions as above possesses at least one corresponding PHPP and could be constructed from it. We also consider numeric examples under time-discrete and -continuous account processes, cases with infinite time horizons and applications to income drawdown and bonus theory.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:20:59 GMT" } ]
2012-06-21T00:00:00
[ [ "Fischer", "Tom", "" ] ]
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711.4226
Bertrand Patureau-Mirand
Nathan Geer, Bertrand Patureau-Mirand
On the Colored HOMFLY-PT, Multivariable and Kashaev Link Invariants
16 pages
null
null
null
math.GT math.QA
null
We study various specializations of the colored HOMFLY-PT polynomial. These specializations are used to show that the multivariable link invariants arising from a complex family of sl(m|n) super-modules previously defined by the authors contains both the multivariable Alexander polynomial and Kashaev's invariants. We conjecture these multivariable link invariants also specialize to the generalized multivariable Alexander invariants defined by Y. Akutsu, T. Deguchi, and T. Ohtsuki.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:21:04 GMT" } ]
2007-11-28T00:00:00
[ [ "Geer", "Nathan", "" ], [ "Patureau-Mirand", "Bertrand", "" ] ]
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711.4227
Le Bolloc'h David
D. Le Bolloc'h, V.L.R. Jacques, N. Kirova, J. Dumas, S. Ravy, J. Marcus, F. Livet
Observation of correlations up to the micrometer scale in sliding charge-density waves
4 pages, 3 figures Typos added, references removed
null
10.1103/PhysRevLett.100.096403
null
cond-mat.str-el
null
High-resolution coherent x-ray diffraction experiment has been performed on the charge density wave (CDW) system K$_{0.3}$MoO$_3$. The $2k_F$ satellite reflection associated with the CDW has been measured with respect to external dc currents. In the sliding regime, the $2k_F$ satellite reflection displays secondary satellites along the chain axis which corresponds to correlations up to the micrometer scale. This super long range order is 1500 times larger than the CDW period itself. This new type of electronic correlation seems inherent to the collective dynamics of electrons in charge density wave systems. Several scenarios are discussed.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:24:22 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 13:11:07 GMT" }, { "version": "v3", "created": "Tue, 8 Jan 2008 14:03:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Bolloc'h", "D. Le", "" ], [ "Jacques", "V. L. R.", "" ], [ "Kirova", "N.", "" ], [ "Dumas", "J.", "" ], [ "Ravy", "S.", "" ], [ "Marcus", "J.", "" ], [ "Livet", "F.", "" ] ]
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711.4228
Frank Morgan
Frank Morgan
Existence of Least-perimeter Partitions
5 pages; for submission to Fortes memorial isue of Philosphical Magazine Letters
null
10.1080/09500830801992849
null
math.MG math.DG
null
We prove the existence of a perimeter-minimizing partition of R^n into regions of unit volume. We conclude with a short tribute to the late Manuel A. Fortes.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:26:05 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 02:26:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Morgan", "Frank", "" ] ]
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711.4229
Bertrand Patureau-Mirand
Nathan Geer, Bertrand Patureau-Mirand, Vladimir Turaev
Modified quantum dimensions and re-normalized link invariants
16 pages
Compositio Mathematica, volume 145 (2009), issue 01, pp. 196-212
10.1112/S0010437X08003795
null
math.QA math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we give a re-normalization of the Reshetikhin-Turaev quantum invariants of links, by modified quantum dimensions. In the case of simple Lie algebras these modified quantum dimensions are proportional to the usual quantum dimensions. More interestingly we will give two examples where the usual quantum dimensions vanish but the modified quantum dimensions are non-zero and lead to non-trivial link invariants. The first of these examples is a class of invariants arising from Lie superalgebras previously defined by the first two authors. These link invariants are multivariable and generalize the multivariable Alexander polynomial. The second example, is a hierarchy of link invariants arising from nilpotent representations of quantized sl(2) at a root of unity. These invariants contain Kashaev's quantum dilogarithm invariants of knots.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:34:17 GMT" }, { "version": "v2", "created": "Wed, 25 Sep 2013 08:08:00 GMT" } ]
2013-09-26T00:00:00
[ [ "Geer", "Nathan", "" ], [ "Patureau-Mirand", "Bertrand", "" ], [ "Turaev", "Vladimir", "" ] ]
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711.423
S\'ebastien Comer\'on
S. Comer\'on (1), J. H. Knapen (1), J. E. Beckman (1, 2), I. Shlosman (3) ((1) Instituto de Astrofisica de Canarias, (2) Consejo Superior de Investigaciones Cientificas, (3) University of Kentucky)
Discovery of ultra-compact nuclear rings in three spiral galaxies
6 pages, 2 Figures, Accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20078845
null
astro-ph
null
Ring-shaped morphologies of nuclear star-forming regions within the central 40-200 pc of disk galaxies have been barely resolved so far in three composite Sy2 nuclei, the Sy2 Circinus galaxy and in three non-AGN galaxies. Such morphologies resemble those of the standard 1 kpc-size nuclear rings that lie in the inner Lindblad resonance regions of disk galaxies and, if they have a similar origin, represent recent radial gas inflows tantalisingly close to the central supermassive black holes. We aim to identify the population of such ultra-compact nuclear rings (UCNRs) and study their properties in relation to those of the host galaxies. From archival Hubble Space Telescope UV and Halpha images and from dust structure maps of the circumnuclear regions in nearby galaxies, we analyse the morphology of the star formation and dust, specifically searching for ring structures on the smallest observable scales. In a sample of 38 galaxies studied, we have detected a total of four new UCNRs, 30-130 pc in radius, in three different galaxies. Including our confirmation of a previous UCNR detection, this yields a UCNR fraction of roughly 10%, although our sample is neither complete nor unbiased. For the first time we resolve UCNRs in two LINERs. Overall the UCNR phenomenon appears widespread and limited neither to late-type galaxies nor exclusively to AGN hosts.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:02:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Comerón", "S.", "" ], [ "Knapen", "J. H.", "" ], [ "Beckman", "J. E.", "" ], [ "Shlosman", "I.", "" ] ]
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711.4231
Bertrand Patureau-Mirand
Nathan Geer, Bertrand Patureau-Mirand
An invariant supertrace for the category of representations of Lie superalgebras
19 pages
null
null
null
math.RT math.QA
null
In this paper we give a re-normalization of the supertrace on the category of representations of Lie superalgebras of type I, by a kind of modified superdimension. The genuine superdimensions and supertraces are generically zero. However, these modified superdimensions are non-zero and lead to a kind of supertrace which is non-trivial and invariant. As an application we show that this new supertrace gives rise to a non-zero bilinear form on a space of invariant tensors of a Lie superalgebra of type I. The results of this paper are completely classical results in the theory of Lie superalgebras but surprisingly we can not prove them without using quantum algebra and low-dimensional topology.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:44:15 GMT" } ]
2007-11-28T00:00:00
[ [ "Geer", "Nathan", "" ], [ "Patureau-Mirand", "Bertrand", "" ] ]
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711.4232
Golden Gadzirayi Nyambuya Mr.
G. G. Nyambuya
Lepton Generation Problem, Some Properties and Implications of the Curved Spacetime Dirac Equation -- (II)
I figure added, Improvements to the arguments made
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This reading is a continuation of the earlier reading Nyambuya (2008); where three new Curved Spacetime Dirac Equations have been derived mainly to try and account in a natural way for the observed anomalous gyromagnetic ratio of fermions and the suggestions is that particles including the Electron, which is thought to be a point particle, do have a finite spatial size and this is one of the reasons for the observed anomalous gyromagnetic ratio. Combining the idea in Nyambuya (2008) which lead to the derivation of the three new Curved Spacetime Dirac Equations, and the proposed Unified Field Theory (Nyambuya 2007), a total of 12 equations each with 16 sub-components are generated thus leading to a total of 192 equations for the Curved Spacetime Dirac Equation. Some symmetries of these equations are investigated, i.e., the Lorentz symmetry, charge conjugation symmetry (C), time reversal symmetry (T), Space reversal (P) and a combination of the C, P and T - symmetries. It is shown that these equations are Lorentz invariant, obey C-symmetry and that some violate T and P-symmetry while others do not and that they all obey PT-symmetry. These symmetries show (or modestly said -- seem to suggest) that anti-particles have positive mass and energy but a negative rest-mass and the opposite sign in electronic charge. Through the inspection of these symmetries, a suggestion is (here) made to the effect that the rest-mass of a particle must be related to the electronic charge of that particle thus leading us to a possible resolution of whether or not Neutrinos do have a none-zero rest-mass. Additionally, we demonstrate that these equations have the potency to explain naturally the observed lepton generation phenomena.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:45:16 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 19:25:23 GMT" }, { "version": "v3", "created": "Mon, 7 Jan 2008 09:27:39 GMT" }, { "version": "v4", "created": "Fri, 27 Jun 2008 12:15:29 GMT" }, { "version": "v5", "created": "Sat, 6 Sep 2008 08:05:23 GMT" }, { "version": "v6", "created": "Fri, 22 Jan 2010 00:54:09 GMT" } ]
2010-01-22T00:00:00
[ [ "Nyambuya", "G. G.", "" ] ]
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711.4233
K. Shizuya
K. Shizuya
Static structure factor for graphene in a magnetic field
7 pages, 3 figures, revtex
Phys. Rev. B 77, 075419 (2008)
10.1103/PhysRevB.77.075419
YITP-07-80
cond-mat.mes-hall
null
A close study is made of the static structure factor for graphene in a magnetic field at integer filling factors nu, with focus on revealing possible signatures of "relativistic" quantum field theory in the low-energy physics of graphene. It is pointed out, in particular, that for graphene even the vacuum state has a nonzero density spectral weight, which, together with the structure factor for all nu, grows significantly with increasing wave vector; such unusual features of density correlations are a "relativistic" effect deriving from massless Dirac quasiparticles in graphene. Remarkably it turns out that the zero-energy Landau levels of electrons or holes, characteristic to graphene, remain indistinguishable in density response from the vacuum state, although they are distinct in Hall conductance.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:45:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Shizuya", "K.", "" ] ]
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711.4234
Ivan Dmitriev
I.A. Dmitriev, F. Evers, I.V. Gornyi, A.D. Mirlin, D.G. Polyakov, and P. W\"olfle
Magnetotransport of electrons in quantum Hall systems
Mini-review for Proceedings of the DFG Priority Progamme "Quantum Hall Systems"; to be published in a special issue of Physica Status Solidi (b); 27 pages, 22 figures
physica status solidi (b), 245, 239 (2008)
10.1002/pssb.200743278
null
cond-mat.dis-nn cond-mat.mes-hall
null
Recent theoretical results on magnetotransport of electrons in a 2D system in the range of moderately strong transverse magnetic fields are reviewed. The phenomena discussed include: quasiclassical memory effects in systems with various types of disorder, transport in lateral superlattices, interaction-induced quantum magnetoresistance, quantum magnetooscillations in dc and ac transport, and oscillatory microwave photoconductivity.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:05:30 GMT" } ]
2008-02-01T00:00:00
[ [ "Dmitriev", "I. A.", "" ], [ "Evers", "F.", "" ], [ "Gornyi", "I. V.", "" ], [ "Mirlin", "A. D.", "" ], [ "Polyakov", "D. G.", "" ], [ "Wölfle", "P.", "" ] ]
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711.4235
Asato Tsuchiya
Takaaki Ishii, Goro Ishiki, Kazutoshi Ohta, Shinji Shimasaki, Asato Tsuchiya
On relationships among Chern-Simons theory, BF theory and matrix model
20 pages, references added, typos corrected
Prog.Theor.Phys.119:863-882,2008
10.1143/PTP.119.863
OU-HET 592, TU-786
hep-th
null
Chern-Simons theory on a U(1) bundle over a Riemann surface \Sigma_g of genus g is dimensionally reduced to BF theory with a mass term, which is equivalent to the two-dimensional Yang-Mills on \Sigma_g. We show that the former is inversely obtained from the latter by the extended matrix T-duality developed in hep-th/0703021. For the case of g=0 (i.e. S^2), the U(1) bundle represents the lens space S^3/Z_p. We find that in this case both the Chern-Simons theory and the BF theory with the mass term are realized in a matrix model. We also construct Wilson loops in the matrix model that correspond to those in the Chern-Simons theory on S^3.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 11:58:04 GMT" }, { "version": "v2", "created": "Fri, 30 May 2008 04:00:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Ishii", "Takaaki", "" ], [ "Ishiki", "Goro", "" ], [ "Ohta", "Kazutoshi", "" ], [ "Shimasaki", "Shinji", "" ], [ "Tsuchiya", "Asato", "" ] ]
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711.4236
Aad Dijksma
D. Alpay, A. Dijksma, H. Langer
The Schur transformation for Nevanlinna functions: operator representations, resolvent matrices, and orthogonal polynomials
37 pages
null
null
null
math.FA math.CV
null
A Nevanlinna function is a function which is analytic in the open upper half plane and has a non-negative imaginary part there. In this paper we study a fractional linear transformation for a Nevanlinna function $n$ with a suitable asymptotic expansion at $\infty$, that is an analogue of the Schur transformation for contractive analytic functions in the unit disc. Applying the transformation $p$ times we find a Nevanlinna function $n_p$ which is a fractional linear transformation of the given function $n$. The main results concern the effect of this transformation to the realizations of $n$ and $n_p$, by which we mean their representations through resolvents of self-adjoint operators in Hilbert space. Our tools are block operator matrix representations, $u$--resolvent matrices, and reproducing kernel Hilbert spaces.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:03:22 GMT" } ]
2007-11-28T00:00:00
[ [ "Alpay", "D.", "" ], [ "Dijksma", "A.", "" ], [ "Langer", "H.", "" ] ]
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711.4237
Henning Bostelmann
Henning Bostelmann, Claudio D'Antoni, Gerardo Morsella
Scaling algebras and pointlike fields: A nonperturbative approach to renormalization
minor changes and clarifications; as to appear in Commun. Math. Phys.; 37 pages
Commun.Math.Phys.285:763-798,2009
10.1007/s00220-008-0613-3
ESI-1985
math-ph hep-th math.MP math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a method of short-distance analysis in quantum field theory that does not require choosing a renormalization prescription a priori. We set out from a local net of algebras with associated pointlike quantum fields. The net has a naturally defined scaling limit in the sense of Buchholz and Verch; we investigate the effect of this limit on the pointlike fields. Both for the fields and their operator product expansions, a well-defined limit procedure can be established. This can always be interpreted in the usual sense of multiplicative renormalization, where the renormalization factors are determined by our analysis. We also consider the limits of symmetry actions. In particular, for suitable limit states, the group of scaling transformations induces a dilation symmetry in the limit theory.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:10:48 GMT" }, { "version": "v2", "created": "Tue, 14 Oct 2008 09:58:40 GMT" } ]
2009-01-01T00:00:00
[ [ "Bostelmann", "Henning", "" ], [ "D'Antoni", "Claudio", "" ], [ "Morsella", "Gerardo", "" ] ]
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711.4238
Goulnara N. Arzhantseva
G. Arzhantseva, M.R. Bridson, T. Januszkiewicz, I. J. Leary, A. Minasyan, J. Swiatkowski
Infinite groups with fixed point properties
Version 2: 29 pages. This is the final published version of the article
Geom. Topol. 13 (2009) 1229-1263
10.2140/gt.2009.13.1229
null
math.GR math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct finitely generated groups with strong fixed point properties. Let $\mathcal{X}_{ac}$ be the class of Hausdorff spaces of finite covering dimension which are mod-$p$ acyclic for at least one prime $p$. We produce the first examples of infinite finitely generated groups $Q$ with the property that for any action of $Q$ on any $X\in \mathcal{X}_{ac}$, there is a global fixed point. Moreover, $Q$ may be chosen to be simple and to have Kazhdan's property (T). We construct a finitely presented infinite group $P$ that admits no non-trivial action by diffeomorphisms on any smooth manifold in $\mathcal{X}_{ac}$. In building $Q$, we exhibit new families of hyperbolic groups: for each $n\geq 1$ and each prime $p$, we construct a non-elementary hyperbolic group $G_{n,p}$ which has a generating set of size $n+2$, any proper subset of which generates a finite $p$-group.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:27:39 GMT" }, { "version": "v2", "created": "Mon, 20 Apr 2009 10:25:31 GMT" } ]
2014-11-11T00:00:00
[ [ "Arzhantseva", "G.", "" ], [ "Bridson", "M. R.", "" ], [ "Januszkiewicz", "T.", "" ], [ "Leary", "I. J.", "" ], [ "Minasyan", "A.", "" ], [ "Swiatkowski", "J.", "" ] ]
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711.4239
Emiliano Di Gennaro Dr.
E. Di Gennaro, D. Morello, C. Miletto, S. Savo, A. Andreone, G. Castaldi, V. Galdi, V. Pierro
A parametric study of the lensing properties of dodecagonal photonic quasicrystals
12 pages, 8 figures, to be pubblished in Photonics and Nanostructures - Fundamentals and Applications
null
10.1016/j.photonics.2007.12.001
null
physics.optics
null
We present a study of the lensing properties of two-dimensional (2-D) photonic quasicrystal (PQC) slabs made of dielectric cylinders arranged according to a 12-fold-symmetric square-triangle aperiodic tiling. Our full-wave numerical analysis confirms the results recently emerged in the technical literature and, in particular, the possibility of achieving focusing effects within several frequency regions. However, contrary to the original interpretation, such focusing effects turn out to be critically associated to local symmetry points in the PQC slab, and strongly dependent on its thickness and termination. Nevertheless, our study reveals the presence of some peculiar properties, like the ability to focus the light even for slabs with a reduced lateral width, or beaming effects, which render PQC slabs potentially interesting and worth of deeper investigation. Key words: Photonic quasicrystals; negative refraction; superlensing.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:39:24 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 13:57:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Di Gennaro", "E.", "" ], [ "Morello", "D.", "" ], [ "Miletto", "C.", "" ], [ "Savo", "S.", "" ], [ "Andreone", "A.", "" ], [ "Castaldi", "G.", "" ], [ "Galdi", "V.", "" ], [ "Pierro", "V.", "" ] ]
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711.424
Yuri Pogorelov
J.M. Teixeira, J. Ventura, Yu.G. Pogorelov, and J.B. Sousa
Quantum effects in atomically perfect specular spin valve structures
5 pages, 5 figures
null
10.1088/0953-8984/20/36/365205
null
cond-mat.mtrl-sci
null
A simple tight-binding theoretical model is proposed for spin dependent, current-in-plane transport in highly coherent spin valve structures under specularity conditions. Using quantum-mechanically coherent and spatially quantized Fermi states in the considered multilayered system, a system of partial Boltzmann kinetic equations is built for relevant subbands to yield the expressions for conductance in parallel or antiparallel spin valve states and thus for the magneto-conductance. It is shown that specularity favors the magnetoresistance to reach its theoretical maximum for this structure close to 100%. This result is practically independent of the model parameters, in particular it does not even need that lifetimes of majority and minority carriers be different (as necessary for the quasiclassical regimes). The main MR effect in the considered limit is due to the transformation of coherent quantum states, induced by the relative rotation of magnetization in the FM layers. Numerical calculation based on the specific Boltzmann equation with an account of spin-dependent specular reflection at the interfaces is also performed for a typical choice of material parameters.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:44:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Teixeira", "J. M.", "" ], [ "Ventura", "J.", "" ], [ "Pogorelov", "Yu. G.", "" ], [ "Sousa", "J. B.", "" ] ]
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711.4241
Bojan Arbutina
Dusan Onic, Bojan Arbutina and Dejan Urosevic
Radial Dependence of Extinction in Parent Galaxies of Supernovae
Accepted for publication in RevMexAA, 10 pages, 6 figures, 6 tables
Revista Mexicana de Astronomia y Astrofisica Vol. 44, pp. 103-110 (2008)
null
null
astro-ph
null
The problem of extinction is the most important issue to be dealt with in the process of obtaining true absolute magnitudes of core-collapse (including stripped-envelope) supernovae (SNe). The plane-parallel model, widely used in the past, was shown not to describe extinction adequately. We try to apply an alternative model which introduces radial dependance of extinction in parent galaxies of supernovae. For calculating extinction in our Galaxy we use two different methods and compare the results obtained. Our analysis is primarily focused on a chosen sample of stripped-envelope SNe (Ib/c) for which we find intrinsic peak absolute magnitude $\mathrm{M}_{\mathrm{B}}^{0}=-17.80\pm 0.43$.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:47:16 GMT" } ]
2008-03-12T00:00:00
[ [ "Onic", "Dusan", "" ], [ "Arbutina", "Bojan", "" ], [ "Urosevic", "Dejan", "" ] ]
[ 0.0400404818, 0.1099959537, 0.0303764734, -0.0118424818, 0.0425379202, 0.0848586783, 0.0257480647, -0.06911394, 0.0743259937, 0.1128191501, -0.0166676994, -0.0007456691, -0.0867589042, -0.0417506844, 0.0818183124, 0.1358390301, -0.0512789637, 0.0497044884, -0.0554594621, 0.0738916546, 0.0047234194, -0.005731218, 0.0519576147, 0.0088699851, -0.0131115615, -0.0476685315, 0.0409091562, 0.0508717708, 0.1465888768, -0.0791579932, 0.026331706, -0.019341588, -0.1376849711, 0.0055445889, -0.1062497944, 0.1439828575, 0.0560838208, 0.0939254686, -0.0823612362, -0.0421850234, -0.0027926539, -0.0662364587, -0.0210653655, 0.0859988108, -0.0436780564, 0.0856187642, -0.0751946643, -0.0462569371, 0.0199523754, -0.0438137874, -0.056789618, 0.0178892724, 0.0687881932, -0.0571153723, -0.08751899, -0.0459854752, 0.0483200401, 0.0302678887, -0.0082931304, -0.0957714021, -0.0546450764, -0.0961514488, 0.0110552451, 0.0001057743, -0.0517947376, -0.0118967732, 0.0055140494, 0.0036273962, 0.0164776761, 0.0500302427, 0.0236713905, -0.0246215034, -0.0542107411, -0.0041771047, 0.0095282774, 0.0359957144, 0.1261750162, -0.0354799405, -0.0025483391, 0.0209432077, 0.0504102893, 0.0560838208, -0.0018561139, -0.0508446246, -0.0977259204, 0.0262909867, 0.0291006081, -0.0093314685, -0.057223957, -0.0104444576, 0.0302135982, -0.0798637941, -0.1203114688, -0.0410448872, 0.0934368372, -0.0436237641, 0.0341497809, -0.0512518175, 0.109887369, 0.0449267775, -0.025110133, 0.0466098338, 0.0300235748, -0.1880681068, 0.0530163124, 0.0126907965, 0.0625445917, 0.0260466728, -0.0270782243, -0.0214997027, 0.1073899269, -0.0761719272, -0.0211739503, 0.0266710334, -0.0764976814, -0.042510774, -0.1553842127, 0.1045124456, 0.0140209552, 0.0774206445, 0.0768234357, 0.0214318372, 0.0116931777, 0.0975630432, 0.1260664314, -0.0934368372, 0.0603729039, -0.0276075732, -0.0125482799, -0.0499488041, 0.0805153027, -0.073945947, 0.0363214687, -0.0477228239, -0.0696025714, 0.0393075384, -0.0334168375, -0.0147946188, -0.0671051294, 0.0714485049, -0.032493867, 0.0542650335, -0.0027400583, 0.0208346229, 0.0254901778, 0.044573877, -0.0450082161, 0.0621102527, 0.0201831181, 0.0421578772, -0.0455782823, -0.0032524408, -0.038140256, -0.1351875216, 0.0135187525, -0.0725886449, 0.012969044, 0.0119985715, -0.0428908207, -0.0709055886, 0.0995175615, 0.0631960928, -0.0883333758, -0.0119714253, -0.0218526013, 0.0896906778, -0.1045124456, -0.0104648173, -0.0876818672, -0.1095073223, -0.0582555085, -0.0061791288, 0.0177671146, -0.1410510838, 0.0377330631, 0.0271189436, -0.0256394818, -0.089853555, -0.0583640933, 0.0101662101, -0.0293449219, 0.0330096446, -0.048835814, -0.054726515, 0.0152561022, 0.0166541263, -0.0298064053, -0.0293720681, -0.043895226, -0.0703083724, 0.0231284685, -0.0380588174, 0.0094061196, 0.1500635743, -0.0348284319, -0.0206581745, 0.0014141416, 0.0143738538, -0.0747060403, -0.016192643, 0.0275125615, 0.064933449, 0.0803524256, -0.1157509238, -0.0376244783, 0.0302678887, 0.0335797109, 0.0430536978, 0.0049304087, 0.0261416845, 0.0383302793, 0.0469084419, -0.0489443988, -0.0488901064, 0.0182150267, -0.0921338275, -0.1088015288, 0.0675394684, 0.1076613888, 0.0751403719, -0.0579840466, -0.0750860795, 0.0368915349, 0.0043501607, 0.0910479799, -0.0468541496, 0.1571215689, -0.0038411717, 0.0169527326, -0.0292363372, -0.0077094892, 0.1276952028, 0.0187036563, 0.0583640933, -0.0198980831, -0.067050837, -0.0370001197, 0.071177043, -0.0273496844, -0.047587093, -0.0916994885, 0.1139049903, -0.1048381999, 0.0855101794, -0.0612415783, 0.0634132624, 0.0101729967, 0.0025958447, -0.018785093, 0.060101442, 0.0455782823, 0.0377330631, 0.0158125963, -0.0197352078, -0.0285576861, -0.0165319685 ]
711.4242
Oliver Piattella
V. Gorini, A. Y. Kamenshchik, U. Moschella, O. F. Piattella and A. A. Starobinsky
Gauge-invariant analysis of perturbations in Chaplygin gas unified models of dark matter and dark energy
References added, discussion expanded, matches the published version
JCAP 0802:016,2008
10.1088/1475-7516/2008/02/016
null
astro-ph gr-qc hep-th
null
We exploit the gauge-invariant formalism to analyse the perturbative behaviour of two cosmological models based on the generalized Chaplygin gas describing both dark matter and dark energy in the present Universe. In the first model we consider the generalized Chaplygin gas alone, while in the second one we add a baryon component to it. We extend our analysis also into the parameter range $\alpha > 1$, where the generalized Chaplygin gas sound velocity can be larger than that of light. In the first model we find that the matter power spectrum is compatible with the observed one only for $\alpha < 10^{-5}$, which makes the generalized Chaplygin gas practically indistinguishable from $\Lambda$CDM. In the second model we study the evolution of inhomogeneities of the baryon component. The theoretical power spectrum is in good agreement with the observed one for almost all values of $\alpha$. However, the growth of inhomogeneities seems to be particularly favoured either for sufficiently small values of $\alpha$ or for $\alpha \gtrsim 3$. Thus, it appears that the viability of the generalized Chaplygin gas as a cosmological model is stronger when its sound velocity is superluminal. We show that in this case the generalized Chaplygin gas equation of state can be changed in an unobservable region in such a way that its equivalent $k$-essence microscopical model has no problems with causality.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 12:53:18 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 14:04:26 GMT" } ]
2009-06-23T00:00:00
[ [ "Gorini", "V.", "" ], [ "Kamenshchik", "A. Y.", "" ], [ "Moschella", "U.", "" ], [ "Piattella", "O. F.", "" ], [ "Starobinsky", "A. A.", "" ] ]
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711.4243
Chay Goldenberg
C. Goldenberg and I. Goldhirsch
Effects of Friction and Disorder on the Quasi-Static Response of Granular Solids to a Localized Force
21 pages (PDFLaTeX), 24 figures (some of them bitmapped to save space); submitted to Phys. Rev. E
null
10.1103/PhysRevE.77.041303
null
cond-mat.soft cond-mat.dis-nn cond-mat.mtrl-sci
null
The response to a localized force provides a sensitive test for different models of stress transmission in granular solids. The elasto-plastic models traditionally used by engineers have been challenged by theoretical and experimental results which suggest a wave-like (hyperbolic) propagation of the stress, as opposed to the elliptic equations of static elasticity. Numerical simulations of two-dimensional granular systems subject to a localized external force are employed to examine the nature of stress transmission in these systems as a function of the magnitude of the applied force, the frictional parameters and the disorder (polydispersity). The results indicate that in large systems (typically considered by engineers), the response is close to that predicted by isotropic elasticity whereas the response of small systems (or when sufficiently large forces are applied) is strongly anisotropic. In the latter case the applied force induces changes in the contact network accompanied by frictional sliding. The larger the coefficient of static friction, the more extended is the range of forces for which the response is elastic and the smaller the anisotropy. Increasing the degree of polydispersity (for the range studied, up to 25%) decreases the range of elastic response. This article is an extension of a previously published letter [1].
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:02:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Goldenberg", "C.", "" ], [ "Goldhirsch", "I.", "" ] ]
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711.4244
Archana Bora
Archana Bora, Ranjan Gupta, Harinder P. Singh, Jayant Murthy, Rekhesh Mohan and Kalpana Duorah
A 3D Automated Classification Scheme for the TAUVEX data pipeline
8 pages, 12 figures, Accepted for publication in MNRAS; High resolution figures available from the authors on request
Mon. Not. R. Astron. Soc. 384, 827-833 (2008)
10.1111/j.1365-2966.2007.12764.x
null
astro-ph
null
In order to develop a pipeline for automated classification of stars to be observed by the TAUVEX ultraviolet space Telescope, we employ an artificial neural network (ANN) technique for classifying stars by using synthetic spectra in the UV region from 1250\AA to 3220\AA as the training set and International Ultraviolet Explorer (IUE) low resolution spectra as the test set. Both the data sets have been pre-processed to mimic the observations of the TAUVEX ultraviolet imager. We have successfully classified 229 stars from the IUE low resolution catalog to within 3-4 spectral sub-class using two different simulated training spectra, the TAUVEX spectra of 286 spectral types and UVBLUE spectra of 277 spectral types. Further, we have also been able to obtain the colour excess (i.e. E(B-V) in magnitude units) or the interstellar reddening for those IUE spectra which have known reddening to an accuracy of better than 0.1 magnitudes. It has been shown that even with the limitation of data from just photometric bands, ANNs have not only classified the stars, but also provided satisfactory estimates for interstellar extinction. The ANN based classification scheme has been successfully tested on the simulated TAUVEX data pipeline. It is expected that the same technique can be employed for data validation in the ultraviolet from the virtual observatories. Finally, the interstellar extinction estimated by applying the ANNs on the TAUVEX data base would provide an extensive extinction map for our galaxy and which could in turn be modeled for the dust distribution in the galaxy.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:28:09 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 08:00:44 GMT" } ]
2009-11-09T00:00:00
[ [ "Bora", "Archana", "" ], [ "Gupta", "Ranjan", "" ], [ "Singh", "Harinder P.", "" ], [ "Murthy", "Jayant", "" ], [ "Mohan", "Rekhesh", "" ], [ "Duorah", "Kalpana", "" ] ]
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711.4245
Gerardo Cristofano
Gerardo Cristofano, Vincenzo Marotta, Adele Naddeo, Giuliano Niccoli
Fully frustrated Josephson junction ladders with Mobius boundary conditions as topologically protected qubits
21 pages, 2 figures, in print in Phys. Lett. A
Phys. Lett. A 372 (2008) 2464
10.1016/j.physleta.2007.11.048
Napoli DSF-T-16/2007, INFN-NA-16/2007
quant-ph cond-mat.stat-mech hep-th
null
We show how to realize a ``protected'' qubit by using a fully frustrated Josephson Junction ladder (JJL) with Mobius boundary conditions. Such a system has been recently studied within a twisted conformal field theory (CFT) approach (Mod. Phys. Lett. A 15 (2000) 1679; Nucl. Phys. B 641 (2002) 547) and shown to develop the phenomenon of flux fractionalization (Eur. Phys. J. B 49 (2006) 83). The relevance of a ``closed'' geometry has been fully exploited in relating the topological properties of the ground state of the system to the presence of half flux quanta and the emergence of a topological order has been predicted (JSTAT (2005) P03006). In this letter the stability and transformation properties of the ground states under adiabatic magnetic flux change are analyzed and the deep consequences on the realization of a solid state qubit, protected from decoherence, are presented.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:06:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Cristofano", "Gerardo", "" ], [ "Marotta", "Vincenzo", "" ], [ "Naddeo", "Adele", "" ], [ "Niccoli", "Giuliano", "" ] ]
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711.4246
Francesco Mainardi
Gianni Pagnini and Francesco Mainardi
Evolution equations of the probabilistic generalization of the Voigt profile function
9 pages. 2 Figures Conference ``Special Functions, Information Theory and Mathematical Physics'',Granada, Spain, September 17-19 2007. Journal of Computational and Applied Mathematics, in press (2008)
null
null
null
math-ph cond-mat.stat-mech math.MP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectrum profile that emerges in molecular spectroscopy and atmospheric radiative transfer as the combined effect of Doppler and pressure broadenings is known as the Voigt profile function. Because of its convolution integral representation, the Voigt profile can be interpreted as the probability density function of the sum of two independent random variables with Gaussian density (due to the Doppler effect) and Lorentzian density (due to the pressure effect). Since these densities belong to the class of symmetric L\'evy stable distributions, a probabilistic generalization is proposed as the convolution of two arbitrary symmetric L\'evy densities. We study the case when the widths of the considered distributions depend on a scale-factor $\tau$ that is representative of spatial inhomogeneity or temporal non-stationarity. The evolution equations for this probabilistic generalization of the Voigt function are here introduced and interpreted as generalized diffusion equations containing two Riesz space-fractional derivatives, thus classified as space-fractional diffusion equations of double order.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:36:12 GMT" }, { "version": "v2", "created": "Thu, 12 Jun 2008 13:03:44 GMT" } ]
2008-06-12T00:00:00
[ [ "Pagnini", "Gianni", "" ], [ "Mainardi", "Francesco", "" ] ]
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711.4247
Pavel Exner
Pavel Exner and Andrea Mantile
On the optimization of the principal eigenvalue for single-centre point-interaction operators in a bounded region
LaTeX, 15 pages
J. Phys. A: Math. Theor. 41 (2008), 065305 (15pp)
10.1088/1751-8113/41/6/065305
null
math-ph math.MP math.SP quant-ph
null
We investigate relations between spectral properties of a single-centre point-interaction Hamiltonian describing a particle confined to a bounded domain $\Omega\subset\mathbb{R}^{d},\: d=2,3$, with Dirichlet boundary, and the geometry of $\Omega$. For this class of operators Krein's formula yields an explicit representation of the resolvent in terms of the integral kernel of the unperturbed one, $(-\Delta_{\Omega}^{D}+z) ^{-1}$. We use a moving plane analysis to characterize the behaviour of the ground-state energy of the Hamiltonian with respect to the point-interaction position and the shape of $\Omega$, in particular, we establish some conditions showing how to place the interaction to optimize the principal eigenvalue.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:15:31 GMT" } ]
2019-12-10T00:00:00
[ [ "Exner", "Pavel", "" ], [ "Mantile", "Andrea", "" ] ]
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711.4248
Ayman Kachmar
Ayman Kachmar
Magnetic vortices for a Ginzburg-Landau type energy with discontinuous constraint
34 pages
null
null
null
math.AP math-ph math.MP
null
This paper is devoted to an analysis of vortex-nucleation for a Ginzburg-Landau functional with discontinuous constraint. This functional has been proposed as a model for vortex-pinning, and usually accounts for the energy resulting from the interface of two superconductors. The critical applied magnetic field for vortex nucleation is estimated in the London singular limit, and as a by-product, results concerning vortex-pinning and boundary conditions on the interface are obtained.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:25:11 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 19:19:09 GMT" } ]
2007-11-28T00:00:00
[ [ "Kachmar", "Ayman", "" ] ]
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711.4249
Ivan Dmitriev
I.A. Dmitriev, A.D. Mirlin, and D.G. Polyakov
Fractional microwave-induced resistance oscillations
3 pages, 2 figures; Proceedings of EP2DS17 to be published in Physica E; less technical version of arXiv:0707.0990
null
10.1016/j.physe.2007.09.003
null
cond-mat.mes-hall cond-mat.dis-nn
null
We develop a systematic theory of microwave-induced oscillations in magnetoresistivity of a 2D electron gas in the vicinity of fractional harmonics of the cyclotron resonance, observed in recent experiments. We show that in the limit of well-separated Landau levels the effect is dominated by the multiphoton inelastic mechanism. At moderate magnetic field, two single-photon mechanisms become important. One of them is due to resonant series of multiple single-photon transitions, while the other originates from microwave-induced sidebands in the density of states of disorder-broadened Landau levels.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:49:09 GMT" } ]
2007-11-28T00:00:00
[ [ "Dmitriev", "I. A.", "" ], [ "Mirlin", "A. D.", "" ], [ "Polyakov", "D. G.", "" ] ]
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711.425
Mairan Teodoro
A. Damineli (1), M. F. Corcoran (3 and 4), D. J. Hillier (2), O. Stahl (5), R. S. Levenhagen (1), N. V. Leister (1), J. H. Groh (1), M. Teodoro (1), J. F. Albacete Colombo (6), F. Gonzalez (7), J. Arias (8), H. Levato (7), M. Grosso (7), N. Morrell (9), R. Gamen (7), G. Wallerstein (10), V. Niemela (11) ((1) Instituto de Astronomia, Geof\'isica e Ci\^encias Atmosf\'ericas, Universidade de S\~ao Paulo, Brazil (2) Department of Physics and Astronomy, University of Pittsburgh, USA (3) CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, USA (4) Universities Space Research Association, USA (5) ZAH, Landessternwarte, Germany (6) Facultad de Ciencias Astronomicas y Geofisicas de La Plata (FCAGLP) (7) Complejo Astronomico El Leoncito, Argentina (8) Departamento de F\'isica, Universidad de La Serena, Chile (9) Las Campanas Observatory, Carnegie Observatories, Chile (10) Department of Astronomy, University of Washington, USA (11) In memoriam)
The periodicity of the eta Carinae events
9 pages, 4 EPS figures, submitted to MNRAS
null
10.1111/j.1365-2966.2007.12815.x
null
astro-ph
null
Extensive spectral observations of eta Carinae over the last cycle, and particularly around the 2003.5 low excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and well defined period. We have combined the cycle lengths derived from the many lines in the optical spectrum with those from broad-band X-rays, optical and near-infrared observations, and obtained a period length of 2022.7+-1.3 d. Spectroscopic data collected during the last 60 years yield an average period of 2020+-4 d, consistent with the present day period. The period cannot have changed by more than $\Delta$P/P=0.0007 since 1948. This confirms the previous claims of a true, stable periodicity, and gives strong support to the binary scenario. We have used the disappearance of the narrow component of HeI 6678 to define the epoch of the Cycle 11 minimum, T_0=JD 2,452,819.8. The next event is predicted to occur on 2009 January 11 (+-2 days). The dates for the start of the minimum in other spectral features and broad-bands is very close to this date, and have well determined time delays from the HeI epoch.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:14:18 GMT" } ]
2016-08-14T00:00:00
[ [ "Damineli", "A.", "", "3 and 4" ], [ "Corcoran", "M. F.", "", "3 and 4" ], [ "Hillier", "D. J.", "" ], [ "Stahl", "O.", "" ], [ "Levenhagen", "R. S.", "" ], [ "Leister", "N. V.", "" ], [ "Groh", "J. H.", "" ], [ "Teodoro", "M.", "" ], [ "Colombo", "J. F. Albacete", "" ], [ "Gonzalez", "F.", "" ], [ "Arias", "J.", "" ], [ "Levato", "H.", "" ], [ "Grosso", "M.", "" ], [ "Morrell", "N.", "" ], [ "Gamen", "R.", "" ], [ "Wallerstein", "G.", "" ], [ "Niemela", "V.", "" ] ]
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711.4251
Andr\'e Chailloux
Andr\'e Chailloux and Iordanis Kerenidis
The role of help in Classical and Quantum Zero-Knowledge
22 pages, 0 figures, This paper will be be superseded by joint work with Dragos Florin Ciocan and Salil Vadhan and will be presented at TCC'08
null
null
null
quant-ph
null
We study the role of help in Non-Interactive Zero-Knowledge protocols and its relation to the standard interactive model. In the classical case, we show that help and interaction are equivalent, answering an open question of Ben-Or and Gutfreund. This implies a new complete problem for the class SZK, the Image Intersection Density. For this problem, we also prove a polarization lemma which is stronger than the previously known one. In the quantum setting, we define the notion of quantum help and show in a more direct way that help and interaction are again equivalent. Moreover, we define quantum Non-Interactive Zero-Knowledge with classical help and prove that it is equal to the class of languages that have classical honest-Verifier Zero Knowledge protocols secure against quantum Verifiers. Last, we provide new complete problems for all these quantum classes. Similar results were independently discovered by Dragos Florin Ciocan and Salil Vadhan.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:48:51 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 14:47:49 GMT" } ]
2007-11-29T00:00:00
[ [ "Chailloux", "André", "" ], [ "Kerenidis", "Iordanis", "" ] ]
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711.4252
Eric Jurgenson
E.D. Jurgenson, S.K. Bogner, R.J. Furnstahl, R.J. Perry
Decoupling in the Similarity Renormalization Group for Nucleon-Nucleon Forces
13 pages, 14 figures
Phys.Rev.C78:014003,2008
10.1103/PhysRevC.78.014003
null
nucl-th cond-mat.str-el hep-ph
null
Decoupling via the Similarity Renormalization Group (SRG) of low-energy nuclear physics from high-energy details of the nucleon-nucleon interaction is examined for two-body observables and few-body binding energies. The universal nature of this decoupling is illustrated and errors from suppressing high-momentum modes above the decoupling scale are shown to be perturbatively small.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:32:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Jurgenson", "E. D.", "" ], [ "Bogner", "S. K.", "" ], [ "Furnstahl", "R. J.", "" ], [ "Perry", "R. J.", "" ] ]
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711.4253
Eduard Simioni
Eduard Simioni
Production and Testing of the LHCb Outer Tracker Front End Readout Electronics
5 pages
TWEPP 2007 proceedings
null
null
physics.ins-det
null
The LHCb Outer Tracker is a straw drift detector with a modular design and a total of 53760 readout channels distributed over a sensitive area of 12 double layers of 6x5 m2 each. The main electronics readout requirement is the precise (0.5 ns) drift time measurement at an occupancy of 4% and 1 MHz readout. A total of 128 channels are read out by one Front-End box. About half of the FE-Boxes have been built. Quality Assurance during the production has been performed on single FE-Box components. The assembled FE-Box is finally commissioned using a special FE-Tester. The FE-Tester is a programmable pulser with a time resolution of 150 ps capable to simulate all the functionality of the readout mimicking the real detector. Consequently, problems have been found and solved resulting in good overall performance.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:58:10 GMT" } ]
2007-11-28T00:00:00
[ [ "Simioni", "Eduard", "" ] ]
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711.4254
Tian-Jun Li
Tian-Jun Li, Yongbin Ruan
Uniruled symplectic divisors
45 pages
null
null
null
math.SG math.AG
null
This is a paper devoted to the symplectic birational geometry program where many basic notions are defined in terms of genus 0 GW invariants. We show that the existence of a positive uniruled symplectic divisor often implies that the ambient manifold has a nonzero uniruled genus 0 GW invariant, hence is uniruled as well. This confirms a part of the dichotomy on uniruled symplectic divisors. In addition, it gives a rather general construction of uniruled symplectic manifolds, generalizing some beautiful results of McDuff.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 13:59:01 GMT" } ]
2007-11-28T00:00:00
[ [ "Li", "Tian-Jun", "" ], [ "Ruan", "Yongbin", "" ] ]
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711.4255
K. Werner
K. Werner, J. Barnstedt, W. Gringel, N. Kappelmann, H. Becker-Ross, S. Florek, R. Graue, D. Kampf, A. Reutlinger, C. Neumann, B. Shustov, A. Moisheev, E. Skripunov
HIRDES - The High-Resolution Double-Echelle Spectrograph for the World Space Observatory Ultraviolet (WSO/UV)
Accepted for publication in Advances in Space Research
Adv.Space Res.41:1992-1997,2008
10.1016/j.asr.2007.11.029
TUE 01/2007
astro-ph
null
The World Space Observatory Ultraviolet (WSO/UV) is a multi-national project grown out of the needs of the astronomical community to have future access to the UV range. WSO/UV consists of a single UV telescope with a primary mirror of 1.7m diameter feeding the UV spectrometer and UV imagers. The spectrometer comprises three different spectrographs, two high-resolution echelle spectrographs (the High-Resolution Double-Echelle Spectrograph, HIRDES) and a low-dispersion long-slit instrument. Within HIRDES the 102-310nm spectral band is split to feed two echelle spectrographs covering the UV range 174-310nm and the vacuum-UV range 102-176nm with high spectral resolution (R>50,000). The technical concept is based on the heritage of two previous ORFEUS SPAS missions. The phase-B1 development activities are described in this paper considering performance aspects, design drivers, related trade-offs (mechanical concepts, material selection etc.) and a critical functional and environmental test verification approach. The current state of other WSO/UV scientific instruments (imagers) is also described.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:00:12 GMT" } ]
2009-06-23T00:00:00
[ [ "Werner", "K.", "" ], [ "Barnstedt", "J.", "" ], [ "Gringel", "W.", "" ], [ "Kappelmann", "N.", "" ], [ "Becker-Ross", "H.", "" ], [ "Florek", "S.", "" ], [ "Graue", "R.", "" ], [ "Kampf", "D.", "" ], [ "Reutlinger", "A.", "" ], [ "Neumann", "C.", "" ], [ "Shustov", "B.", "" ], [ "Moisheev", "A.", "" ], [ "Skripunov", "E.", "" ] ]
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711.4256
Kaspar von Braun
Kaspar von Braun, David R. Ciardi (Caltech)
Observational Window Functions in Planet Transit Searches
8 pages, 6 figures; to appear in the Proceedings of the 249th IAU Meeting: "Exoplanets: Detection, Formation and Dynamics" (Suzhou, China); added referee's comments
null
10.1017/S1743921308016451
null
astro-ph
null
Window functions describe, as a function of orbital period, the probability that an existing planetary transit is detectable in one's data for a given observing strategy. We show the dependence of this probability upon several strategy and astrophysical parameters, such as length of observing run, observing cadence, length of night, and transit duration. The ability to detect a transit is directly related to the intrinsic noise of the observations. In our simulations of the window function, we explicitly address non-correlated (gaussian or white) noise and correlated (red) noise and discuss how these two different noise components affect window functions in different manners.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 01:58:23 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 00:17:42 GMT" } ]
2009-11-13T00:00:00
[ [ "von Braun", "Kaspar", "", "Caltech" ], [ "Ciardi", "David R.", "", "Caltech" ] ]
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711.4257
Ralf Hofmann
Jochen Keller, Ralf Hofmann, and Francesco Giacosa
Correlation of energy density in deconfining SU(2) Yang-Mills thermodynamics
22 pages, 8 figures, v6: formulas (6), (7), (11), (12), (18), (20) altered, figures (2), (6), (7), (8) altered, figures (1), (4), (5) exchanged, no qualitative changes in the results and no change of our conclusions
Int.J.Mod.Phys.A23:5181-5200,2008
10.1142/S0217751X08042535
KA-TP-34-2007
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the two-point correlation of the energy density for the massless mode in deconfining SU(2) Yang-Mills thermodynamics and point towards a possible application for the physics of cold, dilute, and stable clouds of atomic hydrogen within the Milky Way.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:04:48 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 11:00:18 GMT" }, { "version": "v3", "created": "Thu, 21 Feb 2008 10:28:41 GMT" }, { "version": "v4", "created": "Thu, 15 May 2008 14:01:06 GMT" }, { "version": "v5", "created": "Mon, 22 Sep 2008 08:08:53 GMT" }, { "version": "v6", "created": "Wed, 29 Oct 2008 19:47:28 GMT" } ]
2009-02-11T00:00:00
[ [ "Keller", "Jochen", "" ], [ "Hofmann", "Ralf", "" ], [ "Giacosa", "Francesco", "" ] ]
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711.4258
Ulrich Kuhl
R. Hoehmann, U. Kuhl, H.-J. Stoeckmann
Algebraic fidelity decay for local perturbations
4 pages, 5 figures
PRL 100, 124101 (2008)
10.1103/PhysRevLett.100.124101
null
quant-ph cond-mat.mes-hall
null
From a reflection measurement in a rectangular microwave billiard with randomly distributed scatterers the scattering and the ordinary fidelity was studied. The position of one of the scatterers is the perturbation parameter. Such perturbations can be considered as {\em local} since wave functions are influenced only locally, in contrast to, e. g., the situation where the fidelity decay is caused by the shift of one billiard wall. Using the random-plane-wave conjecture, an analytic expression for the fidelity decay due to the shift of one scatterer has been obtained, yielding an algebraic $1/t$ decay for long times. A perfect agreement between experiment and theory has been found, including a predicted scaling behavior concerning the dependence of the fidelity decay on the shift distance. The only free parameter has been determined independently from the variance of the level velocities.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:04:55 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 12:00:08 GMT" } ]
2010-06-07T00:00:00
[ [ "Hoehmann", "R.", "" ], [ "Kuhl", "U.", "" ], [ "Stoeckmann", "H. -J.", "" ] ]
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711.4259
Guihua Chen
YongYao Li, HuaRong Zhang, YongZhu Chen, JianYing Zhou
Coherent control of light field with electromagnetically induced transparency in a dark state Raman coherent tripod system
null
null
null
null
quant-ph
null
The coherent superposition of two-atomic levels induced by coherent population trapping is employed in a standard $\Lambda$ type scheme to form a tripod-like system. A weak probe pulse scanning across the system is shown to experience a crossover from absorption to transparent and then to amplification. Consequently the group velocity of the probe pulse can be controlled to propagate either as a subluminal, a standard, a superluminal or even a negative speed. It is shown that the propagation behavior of the light field is entirely determined and controlled by the initial states of the coherent superposition.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:05:14 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 06:19:46 GMT" } ]
2008-01-02T00:00:00
[ [ "Li", "YongYao", "" ], [ "Zhang", "HuaRong", "" ], [ "Chen", "YongZhu", "" ], [ "Zhou", "JianYing", "" ] ]
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711.426
Roland Donninger
Roland Donninger
Spectral Properties and Stability of Self-Similar Wave Maps
PhD thesis University of Vienna, 143 pages, some typos corrected
null
null
null
math-ph math.MP
null
In this thesis the Cauchy problem and in particular the question of singularity formation for co--rotational wave maps from 3+1 Minkowski space to the three--sphere $S^3$ is studied. Numerics indicate that self--similar solutions of this model play a crucial role in dynamical time evolution. In particular, it is conjectured that a certain solution $f_0$ defines a universal blow up pattern in the sense that the future development of a large set of generic blow up initial data approaches $f_0$. Thus, singularity formation is closely related to stability properties of self--similar solutions. In this work, the problem of linear stability is studied by functional analytic methods. In particular, a complete spectral analysis of the perturbation operators is given and well--posedness of the linearized Cauchy problem is proved by means of semigroup theory and, alternatively, the functional calculus for self--adjoint operators. These results lead to growth estimates which provide information on the stability of self--similar wave maps. Finally, convergence properties of $f_n$ for large $n$ and the spectra of the corresponding perturbation operators are investigated. The thesis is intended to be self--contained as far as possible, i.e. all the mathematical requirements are carefully introduced, including proofs for many results which could be found elsewhere.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:06:02 GMT" } ]
2007-11-28T00:00:00
[ [ "Donninger", "Roland", "" ] ]
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711.4261
Francesco Mainardi
Francesco Mainardi, Gianni Pagnini, Rudolf Gorenflo
Some aspects of fractional diffusion equations of single and distributed order
14 pages. International Symposium on "Analytic Function Theory, Fractional Calculus and Their Applications", University of Victoria (British Columbia, Canada), 22-27 August 2005
Applied Mathematics and Computation, Vol. 187, No 1, pp. 295-305 (2007)
10.1016/j.amc.2006.08.126
null
math-ph cond-mat.dis-nn cond-mat.stat-mech math.MP
null
The time fractional diffusion equation is obtained from the standard diffusion equation by replacing the first-order time derivative with a fractional derivative of order $\beta \in (0,1)$. The fundamental solution for the Cauchy problem is interpreted as a probability density of a self-similar non-Markovian stochastic process related to a phenomenon of sub-diffusion (the variance grows in time sub-linearly). A further generalization is obtained by considering a continuous or discrete distribution of fractional time derivatives of order less than one. Then the fundamental solution is still a probability density of a non-Markovian process that, however, is no longer self-similar but exhibits a corresponding distribution of time-scales.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:17:55 GMT" } ]
2008-05-27T00:00:00
[ [ "Mainardi", "Francesco", "" ], [ "Pagnini", "Gianni", "" ], [ "Gorenflo", "Rudolf", "" ] ]
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711.4262
Thibault Lagache
T. Lagache, E. Dauty, D. Holcman
Toward a quantitative analysis of virus and plasmid trafficking in cells
10 pages, 6 figures
null
null
null
q-bio.QM q-bio.SC
null
Intracellular transport of DNA carriers is a fundamental step of gene delivery. We present here a theoretical approach to study generically a single virus or DNA particle trafficking in a cell cytoplasm. Cellular trafficking has been studied experimentally mostly at the macroscopic level, but very little has been done so far at the microscopic level. We present here a physical model to account for certain aspects of cellular organization, starting with the observation that a viral particle trajectory consists of epochs of pure diffusion and epochs of active transport along microtubules. We define a general degradation rate to describe the limitations of the delivery of plasmid or viral particles to the nucleus imposed by various types of direct and indirect hydrolysis activity inside the cytoplasm. Following a homogenization procedure, which consists of replacing the switching dynamics by a single steady state stochastic description, not only can we study the spatio-temporal dynamics of moving objects in the cytosol, but also estimate the probability and the mean time to go from the cell membrane to a nuclear pore. Computational simulations confirm that our model can be used to analyze and interpret viral trajectories and estimate quantitatively the success of nuclear delivery.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:22:35 GMT" } ]
2007-11-28T00:00:00
[ [ "Lagache", "T.", "" ], [ "Dauty", "E.", "" ], [ "Holcman", "D.", "" ] ]
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711.4263
Nicola Bartolo
N. Bartolo (1 and 2), S. Matarrese (1 and 2), M. Pietroni (2), A. Riotto (2 and 3), D. Seery (4) ((1) Physics Dept. Padova, Italy; (2) INFN, Padova, Italy; (3) CERN, Switzerland; (4) Centre for Theoretical Cosmology, Cambridge, UK)
On the Physical Significance of Infra-red Corrections to Inflationary Observables
11 pages; LateX file; 5 figures. Some coefficients in Eq.(A6) corrected; References added
JCAP 0801:015,2008
10.1088/1475-7516/2008/01/015
null
astro-ph gr-qc hep-ph hep-th
null
Inflationary observables, like the power spectrum, computed at one- and higher-order loop level seem to be plagued by large infra-red corrections. In this short note, we point out that these large infra-red corrections appear only in quantities which are not directly observable. This is in agreement with general expectations concerning infra-red effects.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:26:48 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 18:38:45 GMT" } ]
2009-06-23T00:00:00
[ [ "Bartolo", "N.", "", "1 and 2" ], [ "Matarrese", "S.", "", "1 and 2" ], [ "Pietroni", "M.", "", "2 and 3" ], [ "Riotto", "A.", "", "2 and 3" ], [ "Seery", "D.", "" ] ]
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711.4264
Teppo Mattsson
Teppo Mattsson
Dark energy as a mirage
33 pages, 2 figs; v2: minor clarifications, results unchanged; v3: matches the version published in General Relativity and Gravitation
Gen.Rel.Grav.42:567-599,2010
10.1007/s10714-009-0873-z
HIP-2007-64/TH
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by the observed cosmic matter distribution, we present the following conjecture: due to the formation of voids and opaque structures, the average matter density on the path of the light from the well-observed objects changes from Omega_M ~ 1 in the homogeneous early universe to Omega_M ~ 0 in the clumpy late universe, so that the average expansion rate increases along our line of sight from EdS expansion Ht ~ 2/3 at high redshifts to free expansion Ht ~ 1 at low redshifts. To calculate the modified observable distance-redshift relations, we introduce a generalized Dyer-Roeder method that allows for two crucial physical properties of the universe: inhomogeneities in the expansion rate and the growth of the nonlinear structures. By treating the transition redshift to the void-dominated era as a free parameter, we find a phenomenological fit to the observations from the CMB anisotropy, the position of the baryon oscillation peak, the magnitude-redshift relations of type Ia supernovae, the local Hubble flow and the nucleosynthesis, resulting in a concordant model of the universe with 90% dark matter, 10% baryons, no dark energy, 15 Gyr as the age of the universe and a natural value for the transition redshift z_0=0.35. Unlike a large local void, the model respects the cosmological principle, further offering an explanation for the late onset of the perceived acceleration as a consequence of the forming nonlinear structures. Additional tests, such as quantitative predictions for angular deviations due to an anisotropic void distribution and a theoretical derivation of the model, can vindicate or falsify the interpretation that light propagation in voids is responsible for the perceived acceleration.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 20:47:32 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 09:45:53 GMT" }, { "version": "v3", "created": "Wed, 16 Sep 2009 15:19:53 GMT" } ]
2010-02-23T00:00:00
[ [ "Mattsson", "Teppo", "" ] ]
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711.4265
Timo Anguita
T. Anguita (1), R.W. Schmidt (1), E.L. Turner (2), J. Wambsganss (1), R.L. Webster (3), K.A. Loomis (4), D. Long (4), R. McMillan (4) ((1) ARI/Zentrum fuer Astronomie, University of Heidelberg, (2) Princeton University, (3) University of Melbourne, (4) Apache Point Observatory)
The multiple quasar Q2237+0305 under a microlensing caustic
Accepted for publication in A&A, 8 pages, 4 figures. Slightly modified compared to the original version: qualitative results unchanged, constraints on the r'/g' source size ratio now tighter due to correction of an error in the numerical treatment of the simulated light curves
null
10.1051/0004-6361:20078221
null
astro-ph
null
We use the high magnification event seen in the 1999 OGLE campaign light curve of image C of the quadruply imaged gravitational lens Q2237+0305 to study the structure of the quasar engine. We have obtained g'- and r'-band photometry at the Apache Point Observatory 3.5m telescope where we find that the event has a smaller amplitude in the r'-band than in the g'- and OGLE V-bands. By comparing the light curves with microlensing simulations we obtain constraints on the sizes of the quasar regions contributing to the g'- and r'-band flux. Assuming that most of the surface mass density in the central kiloparsec of the lensing galaxy is due to stars and by modeling the source with a Gaussian profile, we obtain for the Gaussian width 1.20 x 10^15 sqrt(M/0.1M_sun)cm < sigma_g' < 7.96 x 10^15 sqrt(M/0.1Msun) cm, where M is the mean microlensing mass, and a ratio sigma_r'/sigma_g'=1.25^{+0.45}_{-0.15}. With the limits on the velocity of the lensing galaxy from Gil-Merino et al. (2005) as our only prior, we obtain 0.60 x 10^15 sqrt(M/0.1Msun) cm < sigma_g' < 1.57 x 10^15 sqrt(M/0.1Msun) cm and a ratio sigma_r'/sigma_g'=1.45^{+0.90}_{-0.25} (all values at 68 percent confidence). Additionally, from our microlensing simulations we find that, during the chromatic microlensing event observed, the continuum emitting region of the quasar crossed a caustic at >72 percent confidence.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:57:04 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 17:19:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Anguita", "T.", "" ], [ "Schmidt", "R. W.", "" ], [ "Turner", "E. L.", "" ], [ "Wambsganss", "J.", "" ], [ "Webster", "R. L.", "" ], [ "Loomis", "K. A.", "" ], [ "Long", "D.", "" ], [ "McMillan", "R.", "" ] ]
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711.4266
Parimal Kar
Parimal Kar, Max Seel, Ulrich H.E. Hansmann, Siegfried Hoefinger
Dispersion Terms and Analysis of Size- Charge Dependence in an Enhanced Poisson Boltzmann Approach
null
J. Phys. Chem. B, 111 (30), 8910 -8918, 2007
null
null
physics.bio-ph physics.chem-ph
null
We implement a well-established concept to consider dispersion effects within a Poisson-Boltzmann approach of continuum solvation of proteins. The theoretical framework is particularly suited for boundary element methods. Free parameters are determined by comparison to experimental data as well as high-level quantum mechanical reference calculations. The method is general and can be easily extended in several directions. The model is tested on various chemical substances and found to yield good-quality estimates of the solvation free energy without obvious indication of any introduced bias. Once optimized, the model is applied to a series of proteins, and factors such as protein size or partial charge assignments are studied.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:32:32 GMT" } ]
2007-11-28T00:00:00
[ [ "Kar", "Parimal", "" ], [ "Seel", "Max", "" ], [ "Hansmann", "Ulrich H. E.", "" ], [ "Hoefinger", "Siegfried", "" ] ]
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711.4267
Linda \"Ostman
Linda Ostman, Ariel Goobar and Edvard Mortsell
Extinction properties of lensing galaxies
14 pages, 9 figures. Matches version accepted by A&A
Astron.Astrophys.485:403-415,2008
10.1051/0004-6361:20079187
null
astro-ph
null
Context. Observations of quasars shining through foreground galaxies, offer a way to probe the dust extinction curves of distant galaxies. Interesting objects for this study are found in strong gravitational lensing systems, where the foreground galaxies generate multiple images. Aims. The reddening law of lensing galaxies is investigated by studying the colours of gravitationally-lensed quasars, and a handful of other quasars where a foreground galaxy is detected. Methods. We compare the observed colours of quasars reported in the literature, with spectral templates reddened by different extinction laws and dust properties. The data consists of 21 quasar-galaxy systems, with a total of 48 images. The galaxies, which are both early- and late-type, have redshifts in the interval z=0.04-1.51. Results. We measure a difference in rest-frame B-V between the quasar images we study, and quasars without resolved foreground galaxies. This difference in colour is indicative of significant dust extinction in the intervening galaxy. Good fits to standard extinction laws were found for 22 of the images, corresponding to 13 different galaxies. Our fits imply a wide range of possible values for the total-to-selective extinction ratio, Rv. The distribution was found to be broad with a weighted mode of Rv=2.4 and a FWHM of 2.7 (sigma = 1.1). Thus the bulk of the galaxies for which good reddening fits could be derived, have dust properties compatible with the Milky Way value (Rv=3.1).
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:38:05 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 08:12:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Ostman", "Linda", "" ], [ "Goobar", "Ariel", "" ], [ "Mortsell", "Edvard", "" ] ]
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711.4268
Dan Roozemond
Arjeh M. Cohen, Gabor Ivanyos, Dan A. Roozemond
Simple Lie Algebras having Extremal Elements
11 pages
null
10.1016/S0019-3577(09)00003-2
null
math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let L be a simple finite-dimensional Lie algebra of characteristic distinct from 2 and from 3. Suppose that L contains an extremal element that is not a sandwich, that is, an element x such that [x, [x, L]] is equal to the linear span of x in L. In this paper we prove that, with a single exception, L is generated by extremal elements. The result is known, at least for most characteristics, but the proofs in the literature are involved. The current proof closes a gap in a geometric proof that every simple Lie algebra containing no sandwiches (that is, ad-nilpotent elements of order 2) is in fact of classical type.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:43:21 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 08:23:46 GMT" }, { "version": "v3", "created": "Wed, 17 Dec 2008 09:30:33 GMT" } ]
2011-06-17T00:00:00
[ [ "Cohen", "Arjeh M.", "" ], [ "Ivanyos", "Gabor", "" ], [ "Roozemond", "Dan A.", "" ] ]
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711.4269
Smarajit Karmakar
Pinaki Chaudhuri, Smarajit Karmakar and Chandan Dasgupta
Signatures of Dynamical Heterogeneity in the Structure of Glassy Free-energy Minima
5 pages, 5 figures
Phys. Rev. Lett. 100, 125701 (2008)
10.1103/PhysRevLett.100.125701
null
cond-mat.stat-mech cond-mat.soft
null
From numerical minimization of a model free energy functional for a system of hard spheres, we show that the width of the local peaks of the time-averaged density field at a glassy free-energy minimum exhibits large spatial variation, similar to that of the ``local Debye-Waller factor'' in simulations of dynamical heterogeneity. Molecular dynamics simulations starting from a particle configuration generated from the density distribution at a glassy free-energy minimum show similar spatial heterogeneity in the degree of localization, implying a direct connection between dynamical heterogeneity and the structure of glassy free energy minima.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:53:34 GMT" } ]
2008-12-23T00:00:00
[ [ "Chaudhuri", "Pinaki", "" ], [ "Karmakar", "Smarajit", "" ], [ "Dasgupta", "Chandan", "" ] ]
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711.427
Davide Sarchi
D. Sarchi, I. Carusotto, M. Wouters and V. Savona
Dynamics of coherent polaritons in double-well systems
null
null
null
null
cond-mat.other
null
We investigate the physics of coherent polaritons in a double-well configuration under a resonant pumping. For a continuous wave pump, bistability and self-pulsing regimes are identified as a function of the pump energy and intensity. The response to an additional probe pulse is characterized in the different cases and related to the Bogoliubov modes around the stationary state. Under a pulsed pump, a crossover from Josephson-like oscillations to self-trapping is predicted for increasing pump intensity. The accurateness of the effective two-mode model is assessed by comparing its predictions to a full solution of the non-equilibrium Gross-Pitaevskii equation.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:55:00 GMT" } ]
2007-11-28T00:00:00
[ [ "Sarchi", "D.", "" ], [ "Carusotto", "I.", "" ], [ "Wouters", "M.", "" ], [ "Savona", "V.", "" ] ]
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711.4271
Okan Ozer Dr
R. Koc, O. Ozer, H. Tutunculer, R. G. Yildirim
Solution of spin-boson systems in one and two-dimensional geometry via the asymptotic iteration method
13 pages, 5 figures. Please check "http://www1.gantep.edu.tr/~ozer/" for other studies of Nuclear Physics Group at University of Gaziantep
Eur. Phys. J. B 59, 375-383 (2007)
10.1140/epjb/e2007-00294-0
null
quant-ph
null
We consider solutions of the $2\times 2$ matrix Hamiltonian of physical systems within the context of the asymptotic iteration method. Our technique is based on transformation of the associated Hamiltonian in the form of the first order coupled differential equations. We construct a general matrix Hamiltonian which includes a wide class of physical models. The systematic study presented here reproduces a number of earlier results in a natural way as well as leading to new findings. Possible generalizations of the method are also suggested.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 14:57:38 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 06:01:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Koc", "R.", "" ], [ "Ozer", "O.", "" ], [ "Tutunculer", "H.", "" ], [ "Yildirim", "R. G.", "" ] ]
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711.4272
Gustavo Moreno A.
C. D. Fosco, G. A. Moreno
Casimir effect in 2+1 dimensional noncommutative theories
12 pages, 3 figures
Phys.Lett.B659:901-905,2008
10.1016/j.physletb.2007.12.015
null
hep-th
null
We study the Dirichlet Casimir effect for a complex scalar field on two noncommutative spatial coordinates plus a commutative time. To that end, we introduce Dirichlet-like boundary conditions on a curve contained in the spatial plane, in such a way that the correct commutative limit can be reached. We evaluate the resulting Casimir energy for two different curves: (a) Two parallel lines separated by a distance $L$, and (b) a circle of radius $R$. In the first case, the resulting Casimir energy agrees exactly with the one corresponding to the commutative case, regardless of the values of $L$ and of the noncommutativity scale $\theta$, while for the latter the commutative behaviour is only recovered when $R >> \sqrt{\theta}$. Outside of that regime, the dependence of the energy with $R$ is substantially changed due to noncommutative corrections, becoming regular for $R \to 0$.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:03:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Fosco", "C. D.", "" ], [ "Moreno", "G. A.", "" ] ]
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711.4273
Jacob Sonnenschein
Victoria Mazo and Jacob Sonnenschein
Non critical holographic models of the thermal phases of QCD
11 figure minor corrections
JHEP0806:091,2008
10.1088/1126-6708/2008/06/091
null
hep-th
null
We analyze the thermal phases of a non critical holographic model of QCD. The model is based on a six dimensional background of $N_c$ non extremal D4 branes wrapping a spacial circle of radius $R$ and the compactified Euclidean time direction of radius $\beta=1/T$. We place in this background stacks of $N_f$ D4 and anti-D4 flavor probe branes with a separation distance $L$ at large radial direction. %The dual theory is a 4+1 dimensional $SU(N_c)$ gauge theory %compactified on a radius $R$ with anti-periodic boundary conditions for the fermions. The analysis of the DBI effective action yields the following phase diagram: At low temperature the system is in a confining phase with broken chiral symmetry. In the high temperature deconfining phase chiral symmetry can be either restored for $L>L_c=1.06 R$ or broken for $L<L_c$. All of these phase transitions are of first order. We analyze the spectrum of the low-spin and high-spin mesons. High spin mesons above certain critical angular momentum ``melt''. We detect (no) drag for (mesons) quarks moving in hot quark-gluon fluid. The results resemble the structure and properties of the thermal Sakai-Sugimoto model derived in hep-th/0604161.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:07:23 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 14:37:39 GMT" }, { "version": "v3", "created": "Wed, 16 Jan 2008 14:34:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Mazo", "Victoria", "" ], [ "Sonnenschein", "Jacob", "" ] ]
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711.4274
Egor Muljarov
E. A. Muljarov, R. Zimmermann
Exciton dephasing in quantum dots: Coupling to LO phonons via excited states
OECS10 contribution paper
phys. stat. sol. (b) 245, 1106 (2008)
10.1002/pssb.200777613
null
cond-mat.mes-hall
null
We have found a novel mechanism of spectral broadening and dephasing in quantum dots (QDs) due to the coupling to longitudinal-optical (LO) phonons. In theory, this mechanism comes into play only if the complete manifold of exciton levels (including those in the wetting-layer continuum) is taken into account. We demonstrate this nontrivial dephasing in different types of QDs, using the exactly solvable quadratic coupling model, here generalized to an arbitrary number of excitonic states.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:09:10 GMT" } ]
2012-05-16T00:00:00
[ [ "Muljarov", "E. A.", "" ], [ "Zimmermann", "R.", "" ] ]
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711.4275
J. Scott Berg
Robert B. Palmer, J. Scott Berg, Richard C. Fernow, Juan Carlos Gallardo, Harold G. Kirk, Yuri Alexahin, David Neuffer, Stephen Alan Kahn, Don Summers
A Complete Scheme of Ionization Cooling for a Muon Collider
3 pages, 6 figures
Conf.Proc.C070625:3193,2007
10.2172/921988
BNL-78088-2007-CP
physics.acc-ph
null
A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high Tc superconductor at 4 K. Preliminary simulations of each element are presented.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:34:49 GMT" } ]
2011-03-18T00:00:00
[ [ "Palmer", "Robert B.", "" ], [ "Berg", "J. Scott", "" ], [ "Fernow", "Richard C.", "" ], [ "Gallardo", "Juan Carlos", "" ], [ "Kirk", "Harold G.", "" ], [ "Alexahin", "Yuri", "" ], [ "Neuffer", "David", "" ], [ "Kahn", "Stephen Alan", "" ], [ "Summers", "Don", "" ] ]
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711.4276
George E. A. Matsas
George E. A. Matsas, Vicente Pleitez, Alberto Saa, Daniel A. T. Vanzella
The number of dimensional fundamental constants
7 pages, 2 figures, v2: Only changes in authors affiliations
null
null
null
physics.class-ph gr-qc hep-th physics.gen-ph
null
We revisit, qualify, and objectively resolve the seemingly controversial question about what is the number of dimensional fundamental constants in Nature. For this purpose, we only assume that all we can directly measure are space and time intervals, and that this is enough to evaluate any physical observable. We conclude that the number of dimensional fundamental constants is two. We emphasize that this is an objective result rather than a "philosophical opinion", and we let it clear how it could be refuted in order to prove us wrong. Our conclusion coincides with Veneziano's string-theoretical one but our arguments are not based on any particular theory. As a result, this implies that one of the three usually considered fundamental constants "G", "c" or "h" can be eliminated and we show explicitly how this can be accomplished.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:13:37 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 20:09:29 GMT" } ]
2007-12-04T00:00:00
[ [ "Matsas", "George E. A.", "" ], [ "Pleitez", "Vicente", "" ], [ "Saa", "Alberto", "" ], [ "Vanzella", "Daniel A. T.", "" ] ]
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711.4277
Bjoern Trauzettel
A. Komnik, B. Trauzettel, U. Weiss
Statistics of charge transfer through impurities in strongly correlated 1D metals
11 pages, review article
Ann. Phys. (Leipzig) 16, 661 (2007)
10.1002/andp.200710258
null
cond-mat.mes-hall cond-mat.str-el
null
We review recent advances in the field of full counting statistics (FCS) of charge transfer through impurities imbedded into strongly correlated one-dimensional metallic systems, modelled by Tomonaga-Luttinger liquids (TLLs). We concentrate on the exact analytic solutions for the cumulant generating function (CGF), which became available recently and apply these methods in order to obtain the FCS of a non-trivial contact between two crossed TLL.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:15:58 GMT" } ]
2007-11-28T00:00:00
[ [ "Komnik", "A.", "" ], [ "Trauzettel", "B.", "" ], [ "Weiss", "U.", "" ] ]
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711.4278
David J. Thompson
D. J. Thompson
Gamma-Ray Pulsar Studies with GLAST
8 pages, 5 figures. To appear in the proceedings of "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007, McGill University, Montreal, Canada
AIP Conf.Proc.983:56-63,2008
10.1063/1.2900301
null
astro-ph
null
Some pulsars have their maximum observable energy output in the gamma-ray band, offering the possibility of using these high-energy photons as probes of the particle acceleration and interaction processes in pulsar magnetospheres. After an extended hiatus between satellite missions, the recently-launched AGILE mission and the upcoming Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT) will allow gamma-ray tests of the theoretical models developed based on past discoveries. With its greatly improved sensitivity, better angular resolution, and larger energy reach than older instruments, GLAST LAT should detect dozens to hundreds of new gamma-ray pulsars and measure luminosities, light curves, and phase-resolved spectra with unprecedented resolution. It will also have the potential to find radio-quiet pulsars like Geminga, using blind search techniques. Cooperation with radio and X-ray pulsar astronomers is an important aspect of the LAT team's planning for pulsar studies.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:16:08 GMT" } ]
2009-06-23T00:00:00
[ [ "Thompson", "D. J.", "" ] ]
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711.4279
Patrizia Michetti
J. Franz, F.A. Gianturco, K.L. Baluja, J. Tennyson, R. Carey, R. Montuoro, R.R. Lucchese, T. Stoecklin
Correlation-Polarization Effects in Electron/Positron Scattering from Acetylene: A Comparison of Computational Models
null
null
10.1016/j.nimb.2007.12.019
null
physics.chem-ph
null
Different computational methods are employed to evaluate elastic (rotationally summed) integral and differential cross sections for low energy (below about 10 eV) positron scattering off gas-phase C$_2$H$_2$ molecules. The computations are carried out at the static and static-plus-polarization levels for describing the interaction forces and the correlation-polarization contributions are found to be an essential component for the correct description of low-energy cross section behavior. The local model potentials derived from density functional theory (DFT) and from the distributed positron model (DPM) are found to produce very high-quality agreement with existing measurements. On the other hand, the less satisfactory agreement between the R-matrix (RM) results and measured data shows the effects of the slow convergence rate of configuration-interaction (CI) expansion methods with respect to the size of the CI-expansion. To contrast the positron scattering findings, results for electron-C$_2$H$_2$ integral and differential cross sections, calculated with both a DFT model potential and the R-matrix method, are compared and analysed around the shape resonance energy region and found to produce better internal agreement.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:21:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Franz", "J.", "" ], [ "Gianturco", "F. A.", "" ], [ "Baluja", "K. L.", "" ], [ "Tennyson", "J.", "" ], [ "Carey", "R.", "" ], [ "Montuoro", "R.", "" ], [ "Lucchese", "R. R.", "" ], [ "Stoecklin", "T.", "" ] ]
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711.428
Saverio Pascazio
Paolo Facchi, Giuseppe Marmo and Saverio Pascazio
Quantum Zeno dynamics and quantum Zeno subspaces
20 pages, 9 figures. Dedicated to George Sudarshan on the occasion of his 75th birthday. Review of the quantum Zeno dynamics in its three different formulations. Proposal of a novel experiment in Section 10
J.Phys.Conf.Ser.196:012017,2009
10.1088/1742-6596/196/1/012017
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A quantum Zeno dynamics can be obtained by means of frequent measurements, frequent unitary kicks or a strong continuous coupling and yields a partition of the total Hilbert space into quantum Zeno subspaces, among which any transition is hindered. We focus on the "continuous" version of the quantum Zeno effect and look at several interesting examples. We first analyze these examples in practical terms, towards applications, then propose a novel experiment.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:22:20 GMT" }, { "version": "v2", "created": "Fri, 20 Mar 2009 09:45:01 GMT" } ]
2014-11-18T00:00:00
[ [ "Facchi", "Paolo", "" ], [ "Marmo", "Giuseppe", "" ], [ "Pascazio", "Saverio", "" ] ]
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711.4281
Yvonne C. Pachmayer
HADES Collaboration: G. Agakishiev, C. Agodi, H. Alvarez Pol, A. Balanda, R. Bassini, G. Bellia, D. Belver, A. Belyaev, A. Blanco, M. Boehmer, A. Bortolotti, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, E. Castro, T. Christ, M. Destefanis, J. Diaz, F. Dohrmann, A. Dybczak, T. Eberl, L. Fabbietti, P. Finocchiaro, P. Fonte, J. Friese, I. Froehlich, T. Galatyuk, J. A. Garzon, R. Gernhaeuser, A. Gil, C. Gilardi, M. Golubeva, D. Gonzalez Diaz, E. Grosse, F. Guber, M. Heilmann, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovic, B. Kaempfer, K. Kanaki, T. Karavicheva, D. Kirschner, I. Koenig, W. Koenig, B. W. Kolb, R. Kotte, A. Kozuch, A. Krasa, F. Krizek, R. Kruecken, W. Kuehn, A. Kugler, A. Kurepin, J. Lamas Valverde, S. Lang, J. S. Lange, K. Lapidus, L. Lopes, L. Maier, A. Mangiarotti, J. Marin, J. Markert, V. Metag, B. Michalska, D. Mishra, E. Moriniere, J. Mousa, M. Muench, C. Muentz, L. Naumann, R. Novotny, J. Otwinowski, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, T. Perez, J. Pietraszko, R. Pleskac, W. Przygoda, B. Ramstein, A. Reshetin, M. Roy Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, A. Schmah, R. Simon, Y. Sobolev, S. Spataro, B. Spruck, H. Stroebele, J. Stroth, C. Sturm, M. Sudol, A. Tarantola, K. Teilab, P. Tlusty, A. Toia, M. Traxler, R. Trebacz, H. Tsertos, I. Veretenkin, V. Wagner, M. Weber, H. Wen, M. Wisniowski, T. Wojcik, J. Wuestenfeld, S. Yurevich, Y. Zanevsky, P. Zhou, P. Zumbruch
Study of dielectron production in C+C collisions at 1 AGeV
submitted to Physics Letters B
Phys.Lett.B663:43-48,2008
10.1016/j.physletb.2008.03.062
null
nucl-ex
null
The emission of e+e- pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the pi0-Dalitz to the rho/omega! invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:31:38 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 14:02:58 GMT" }, { "version": "v3", "created": "Fri, 21 Mar 2008 16:23:31 GMT" } ]
2008-11-26T00:00:00
[ [ "HADES Collaboration", "", "" ], [ "Agakishiev", "G.", "" ], [ "Agodi", "C.", "" ], [ "Pol", "H. Alvarez", "" ], [ "Balanda", "A.", "" ], [ "Bassini", "R.", "" ], [ "Bellia", "G.", "" ], [ "Belver", "D.", "" ], [ "Belyaev", "A.", "" ], [ "Blanco", "A.", "" ], [ "Boehmer", "M.", "" ], [ "Bortolotti", "A.", "" ], [ "Boyard", "J. L.", "" ], [ "Braun-Munzinger", "P.", "" ], [ "Cabanelas", "P.", "" ], [ "Castro", "E.", "" ], [ "Christ", "T.", "" ], [ "Destefanis", "M.", "" ], [ "Diaz", "J.", "" ], [ "Dohrmann", "F.", "" ], [ "Dybczak", "A.", "" ], [ "Eberl", "T.", "" ], [ "Fabbietti", "L.", "" ], [ "Finocchiaro", "P.", "" ], [ "Fonte", "P.", "" ], [ "Friese", "J.", "" ], [ "Froehlich", "I.", "" ], [ "Galatyuk", "T.", "" ], [ "Garzon", "J. A.", "" ], [ "Gernhaeuser", "R.", "" ], [ "Gil", "A.", "" ], [ "Gilardi", "C.", "" ], [ "Golubeva", "M.", "" ], [ "Diaz", "D. Gonzalez", "" ], [ "Grosse", "E.", "" ], [ "Guber", "F.", "" ], [ "Heilmann", "M.", "" ], [ "Hennino", "T.", "" ], [ "Holzmann", "R.", "" ], [ "Ierusalimov", "A.", "" ], [ "Iori", "I.", "" ], [ "Ivashkin", "A.", "" ], [ "Jurkovic", "M.", "" ], [ "Kaempfer", "B.", "" ], [ "Kanaki", "K.", "" ], [ "Karavicheva", "T.", "" ], [ "Kirschner", "D.", "" ], [ "Koenig", "I.", "" ], [ "Koenig", "W.", "" ], [ "Kolb", "B. W.", "" ], [ "Kotte", "R.", "" ], [ "Kozuch", "A.", "" ], [ "Krasa", "A.", "" ], [ "Krizek", "F.", "" ], [ "Kruecken", "R.", "" ], [ "Kuehn", "W.", "" ], [ "Kugler", "A.", "" ], [ "Kurepin", "A.", "" ], [ "Valverde", "J. Lamas", "" ], [ "Lang", "S.", "" ], [ "Lange", "J. S.", "" ], [ "Lapidus", "K.", "" ], [ "Lopes", "L.", "" ], [ "Maier", "L.", "" ], [ "Mangiarotti", "A.", "" ], [ "Marin", "J.", "" ], [ "Markert", "J.", "" ], [ "Metag", "V.", "" ], [ "Michalska", "B.", "" ], [ "Mishra", "D.", "" ], [ "Moriniere", "E.", "" ], [ "Mousa", "J.", "" ], [ "Muench", "M.", "" ], [ "Muentz", "C.", "" ], [ "Naumann", "L.", "" ], [ "Novotny", "R.", "" ], [ "Otwinowski", "J.", "" ], [ "Pachmayer", "Y. C.", "" ], [ "Palka", "M.", "" ], [ "Parpottas", "Y.", "" ], [ "Pechenov", "V.", "" ], [ "Pechenova", "O.", "" ], [ "Perez", "T.", "" ], [ "Pietraszko", "J.", "" ], [ "Pleskac", "R.", "" ], [ "Przygoda", "W.", "" ], [ "Ramstein", "B.", "" ], [ "Reshetin", "A.", "" ], [ "Stephan", "M. Roy", "" ], [ "Rustamov", "A.", "" ], [ "Sadovsky", "A.", "" ], [ "Sailer", "B.", "" ], [ "Salabura", "P.", "" ], [ "Schmah", "A.", "" ], [ "Simon", "R.", "" ], [ "Sobolev", "Y.", "" ], [ "Spataro", "S.", "" ], [ "Spruck", "B.", "" ], [ "Stroebele", "H.", "" ], [ "Stroth", "J.", "" ], [ "Sturm", "C.", "" ], [ "Sudol", "M.", "" ], [ "Tarantola", "A.", "" ], [ "Teilab", "K.", "" ], [ "Tlusty", "P.", "" ], [ "Toia", "A.", "" ], [ "Traxler", "M.", "" ], [ "Trebacz", "R.", "" ], [ "Tsertos", "H.", "" ], [ "Veretenkin", "I.", "" ], [ "Wagner", "V.", "" ], [ "Weber", "M.", "" ], [ "Wen", "H.", "" ], [ "Wisniowski", "M.", "" ], [ "Wojcik", "T.", "" ], [ "Wuestenfeld", "J.", "" ], [ "Yurevich", "S.", "" ], [ "Zanevsky", "Y.", "" ], [ "Zhou", "P.", "" ], [ "Zumbruch", "P.", "" ] ]
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711.4282
Wieslaw Laskowski
P. Badziag, C. Brukner, W. Laskowski, T. Paterek, M. Zukowski
Experimentally friendly geometrical criteria for entanglement
4 pages, journal version
Phys. Rev. Lett. 100, 140403 (2008)
10.1103/PhysRevLett.100.140403
null
quant-ph
null
We present an intuitive geometrical entanglement criterion. It allows formulation of simple and experimentally friendly sufficient conditions for entanglement. The conditions are illustrated with several examples. Moreover, a generalization of our approach is a necessary and sufficient separability condition. It can be associated with a family of entanglement identifiers, which is strictly richer than the family of entanglement witnesses.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 18:51:55 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 16:01:43 GMT" } ]
2015-05-13T00:00:00
[ [ "Badziag", "P.", "" ], [ "Brukner", "C.", "" ], [ "Laskowski", "W.", "" ], [ "Paterek", "T.", "" ], [ "Zukowski", "M.", "" ] ]
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711.4283
Dmitry Matyushov V
Vitaliy Kapko, Dmitry V. Matyushov, and C. Austen Angell
Thermodynamics and Dynamics of a Monoatomic Glass-Former. Constant Pressure and Constant Volume Behavior
14 pages, 14 figures
null
10.1063/1.2883693
null
cond-mat.soft cond-mat.stat-mech
null
We report constant-volume and constant-pressure simulations of the thermodynamic and dynamic properties of the low-temperature liquid and crystalline phases of the modified Stillinger-Weber (mSW) model. We have found an approximately linear increase of the effective Gaussian width of the distribution of inherent structures. This effect comes from non-Gaussianity of the landscape and is consistent with the predictions of the Gaussian excitations model representing the thermodynamics of the configurational manifold as an ensemble of excitations, each carrying an excitation entropy. The mSW model provides us with both the configurational and excess entropies, with the difference mostly attributed to vibrational anharmonicity. We therefore can address the distinction between the excess thermodynamic quantities often used in the Adam-Gibbs (AG) equation. We find a new break in the slope of the constant pressure AG plot when the excess entropy is used in the AG equation. The simulation diffusivity data are equally well fitted by applying a new equation, derived within the Gaussian excitations model, that emphasizes enthalpy over entropy as the thermodynamic control variable for transport in viscous liquids.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:36:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Kapko", "Vitaliy", "" ], [ "Matyushov", "Dmitry V.", "" ], [ "Angell", "C. Austen", "" ] ]
[ 0.0119852843, 0.110291481, -0.0559761003, -0.0442289338, -0.0685292035, -0.0348263159, 0.0025612973, -0.0498460829, 0.0160088707, -0.0277926717, 0.0469398201, -0.0078640068, -0.1025740057, 0.0845502838, 0.0173154697, 0.1304155141, -0.0197821297, 0.0576856658, -0.054315377, 0.009219449, -0.0870902166, -0.086845994, -0.0944657773, 0.0578322001, -0.0228959825, 0.0388560109, 0.0215893853, 0.0123943593, -0.0050798557, -0.0484295823, 0.0623747632, -0.0152517771, 0.0046707806, -0.0330923274, -0.0725344718, 0.1811163872, 0.0314804502, 0.0465002172, -0.0105993142, -0.035876479, -0.0813753754, -0.0026773037, -0.0452058278, 0.1581593454, 0.0697503239, -0.0093415612, -0.0101047605, 0.0463292599, 0.0520685203, -0.0198676083, -0.1083376855, -0.0072534475, 0.0545107573, -0.1059931368, 0.0074976711, -0.0695549473, 0.0112953521, 0.0284520742, -0.0089752255, -0.013456733, 0.0320910104, -0.124944903, -0.0130415522, -0.0228837729, -0.0835733935, -0.0089324862, -0.0778097063, 0.1208419427, 0.0486982316, 0.0472084656, -0.0307477787, -0.0591510087, 0.0176573824, -0.0145068951, -0.1057977602, -0.0305524003, 0.0510427803, 0.021650441, -0.0475992225, 0.0421530306, 0.0063070804, -0.0379768051, 0.0425926335, 0.0455721654, -0.0288428329, -0.0321886986, 0.0130903972, 0.0225784928, -0.0154105229, -0.033409819, 0.0399061739, 0.0549503602, 0.0076991557, 0.0450104512, 0.0593952313, -0.0798611864, 0.1106822342, -0.0047104671, 0.0575391315, -0.0149587085, -0.0513846911, 0.0247520842, -0.0029413707, 0.0038740004, 0.1574755162, -0.0242880583, -0.1086307541, -0.0906070396, -0.0476969108, 0.0292580128, 0.1030624509, -0.0977872163, -0.00330618, -0.0237996113, -0.0446929596, -0.076686278, -0.0992037132, -0.0007334347, -0.1323693097, 0.0644750893, 0.0339471102, 0.0095613627, 0.0506520197, -0.0652566031, 0.0625213012, 0.0060659093, -0.0048570014, -0.0907535702, -0.0403946191, 0.0687245801, 0.1340300292, -0.0546572916, -0.0146778515, -0.1286571026, -0.0044296095, -0.0931469649, 0.0143603608, 0.0401259735, 0.1448735744, 0.0495774373, 0.0255458113, 0.0821080506, 0.0372197106, 0.0147511186, 0.0208933484, 0.1242610812, 0.0080960197, 0.0035778789, -0.0032329129, -0.0387827419, -0.0804473236, -0.0422018766, 0.0596394576, -0.0809846222, 0.1025740057, -0.0696037859, 0.0891416967, 0.1270940751, 0.0820592046, -0.0703853071, -0.0321154334, 0.0444243141, -0.0339715332, 0.0097933756, 0.0159111824, 0.0675523058, -0.0168270208, -0.0156791694, -0.0511893146, -0.1315877885, 0.0386362076, -0.009860537, -0.0578810461, -0.0747813359, 0.0759047642, -0.0264982842, 0.0833291709, -0.0858690962, -0.0549992062, 0.0499681942, -0.0326038785, -0.004017482, 0.0877740383, -0.1716405004, -0.0312118046, -0.019672228, -0.0274507571, 0.136863023, 0.051824294, -0.0224930141, -0.0595906116, 0.0394421481, 0.1065792739, -0.0024697133, -0.0205148011, -0.090313971, -0.0046585696, 0.0810823068, 0.0529477261, 0.1218188405, 0.0410296023, -0.024165947, 0.0370243303, -0.1516141444, -0.0172788352, 0.0192570481, 0.022187734, 0.0597859919, -0.1347138584, 0.003712202, 0.0626678318, 0.017462004, 0.0770770386, 0.0335319303, -0.0446929596, -0.0108069042, -0.0716064274, 0.0306012444, 0.0562203228, 0.0899232104, -0.0562691689, -0.0176085383, 0.0168636553, 0.0700433925, 0.0562691689, 0.0236652885, 0.0399794392, -0.1068723425, 0.0462804139, 0.0440335535, -0.0125897378, 0.0413715169, -0.0492355227, 0.0142870937, -0.0043502366, -0.0896301419, 0.0247398727, 0.0756116956, 0.0594440773, -0.0156303253, -0.0598836802, 0.0654031411, -0.0318956301, 0.0448883399, 0.0146412179, 0.0963707194, -0.0613978691, -0.0137620121, -0.0316514075, 0.0000200101, -0.0165217407, -0.0639377981, -0.0068260557, -0.0133834658, -0.008731002, -0.1031601429 ]
711.4284
Ruth Britto
Ruth Britto, Bo Feng
Integral Coefficients for One-Loop Amplitudes
32 pages, 1 figure
JHEP0802:095,2008
10.1088/1126-6708/2008/02/095
ITFA-2007-53
hep-ph hep-th
null
We present a set of algebraic functions for evaluating the coefficients of the scalar integral basis of a general one-loop amplitude. The functions are derived from unitarity cuts, but the complete cut-integral procedure has been carried out in generality so that it never needs to be repeated. Where the master integrals are known explicitly, the results here can be used as a black box with tree-level amplitudes as input and one-loop amplitudes as output.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:27:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Britto", "Ruth", "" ], [ "Feng", "Bo", "" ] ]
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711.4285
Roman Khymyn S
B. A. Ivanov, A. Yu. Galkin, R. S. Khymyn, A. Yu. Merkulov
Non-linear dynamics and two-dimensional solitons for spin $ S=1$ ferromagnets with biquadratic exchange
11 pages, 7 figures, MikTEX
null
10.1103/PhysRevB.77.064402
null
cond-mat.other
null
We develop a consistent semiclassical theory of spin dynamics for an isotropic ferromagnet with a spin $ S=1$ taking into consideration both bilinear and biquadratic over spin operators exchange interaction. For such non-Heisenberg magnets, a peculiar class of spin oscillations and waves, for which the quantum spin expectation value $ {\rm {\bf m}}=<{\rm {\bf S}}>$ does not change it direction, but changes in length, is presented. Such ``longitudinal'' excitations do not exist in regular magnets, dynamics of which are described in terms of the Landau-Lifshitz equation or by means of the spin Heisenberg Hamiltonian. We demonstrate the presence of non-linear uniform oscillations and waves, as well as self-localized dynamical excitations (solitons) with finite energy. A possibility of excitation of such oscillations by ultrafast laser pulse is discussed.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:41:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Ivanov", "B. A.", "" ], [ "Galkin", "A. Yu.", "" ], [ "Khymyn", "R. S.", "" ], [ "Merkulov", "A. Yu.", "" ] ]
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711.4286
Jaros{\l}aw Miszczak
D. Markham, J.A. Miszczak, Z. Puchala, K. Zyczkowski
Quantum state discrimination: a geometric approach
12 pages, 2 figures
Phys. Rev. A 77, 042111 (2008)
10.1103/PhysRevA.77.042111
null
quant-ph
null
We analyse the problem of finding sets of quantum states that can be deterministically discriminated. From a geometric point of view this problem is equivalent to that of embedding a simplex of points whose distances are maximal with respect to the Bures distance (or trace distance). We derive upper and lower bounds for the trace distance and for the fidelity between two quantum states, which imply bounds for the Bures distance between the unitary orbits of both states. We thus show that when analysing minimal and maximal distances between states of fixed spectra it is sufficient to consider diagonal states only. Hence considering optimal discrimination, given freedom up to unitary orbits, it is sufficient to consider diagonal states. This is illustrated geometrically in terms of Weyl chambers.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:41:26 GMT" } ]
2008-06-09T00:00:00
[ [ "Markham", "D.", "" ], [ "Miszczak", "J. A.", "" ], [ "Puchala", "Z.", "" ], [ "Zyczkowski", "K.", "" ] ]
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711.4287
George Lusztig
G. Lusztig
Unipotent classes and special Weyl group representations
31 pages
null
null
null
math.RT
null
We show that various invariants of a unipotent conjugacy class in a connected semisimple group can be recovered purely in terms of data involving the Weyl group.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:49:18 GMT" } ]
2007-11-28T00:00:00
[ [ "Lusztig", "G.", "" ] ]
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711.4288
Pedro Pina Avelino
P. P. Avelino, L.M.G. be\c{c}a, C.J.A.P. Martins
Linear and non-Linear Instabilities in Unified Dark Energy Models
6 pages, accepted for publication in Physical Review D
Phys. Rev. D77:063515,2008
10.1103/PhysRevD.77.063515
null
astro-ph
null
We revisit the paradigm of unified dark energy discussing in detail the averaging problem in this type of scenarios, highlighting the need for a full non-linear treatment. We also address the question of if and how models with one or several dark fluids can be observationally distinguished. Simpler and physically clearer derivations of some key results, most notably on the relation between the generalized Chaplygin gas and the standard ($\Lambda$CDM) `concordance' model and on a Jeans-type small-scale instability of some coupled dark energy/dark matter models are presented.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:10:55 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 15:47:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Avelino", "P. P.", "" ], [ "beça", "L. M. G.", "" ], [ "Martins", "C. J. A. P.", "" ] ]
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711.4289
Martha Evonuk
M. Evonuk
The role of density stratification in generating zonal flow structures in a rotating fluid
15 pages, 5 figures, accepted to ApJ
null
10.1086/524938
null
astro-ph
null
Local generation of vorticity occurs in rotating density-stratified fluids as fluid parcels move radially, expanding or contracting with respect to the background density stratification. Thermal convection in rotating 2D equatorial simulations demonstrates this mechanism. The convergence of the vorticity into zonal flow structures as a function of radius depends on the shape of the density profile, with the prograde jet forming in the region of the disk where the greatest number of density scale heights occurs. The number of stable jets that form in the fluid increases with decreasing Ekman number and decreases with increasing thermal driving. This local form of vorticity generation via the density stratification is likely to be of great importance in bodies that are quickly rotating, highly turbulent, and have large density changes, such as Jovian planets. However, it is likely to be of lesser importance in the interiors of planets such as the Earth, which have smaller density stratifications and are less turbulent.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:54:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Evonuk", "M.", "" ] ]
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711.429
Roland Hoffmann
Thomas DeGrand, Roland Hoffmann, Johannes Najjar
More about QCD on compact spaces
9 pages, 8 figures, JHEP style
JHEP0801:032,2008
10.1088/1126-6708/2008/01/032
null
hep-lat
null
We present some results about spontaneous breaking of global symmetries for four-flavor, three color QCD on compact spaces with two short directions. When the two short directions have equal length and identical boundary conditions, there is a single transition. When the two short directions have boundary conditions of opposite parity and are of roughly equal extent, the C-breaking and deconfinement transitions separate. When the two short dimensions are of different length, the transitions are modified in qualitative agreement with expectations from dimensional reduction. These features resemble the situation in pure gauge simulations at small and large number of colors.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 15:58:33 GMT" } ]
2008-11-26T00:00:00
[ [ "DeGrand", "Thomas", "" ], [ "Hoffmann", "Roland", "" ], [ "Najjar", "Johannes", "" ] ]
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711.4291
Artur Avila
Artur Avila and David Damanik
Absolute Continuity of the Integrated Density of States for the Almost Mathieu Operator with Non-Critical Coupling
13 pages, to appear in Inv. Math
Invent. Math. 172 (2008), 439-453
10.1007/s00222-007-0105-7
null
math.DS math-ph math.MP math.SP
null
We show that the integrated density of states of the almost Mathieu operator is absolutely continuous if and only if the coupling is non-critical. We deduce for subcritical coupling that the spectrum is purely absolutely continuous for almost every phase, settling the measure-theoretical case of Problem 6 of Barry Simon's list of Schr\"odinger operator problems for the twenty-first century.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:08:40 GMT" } ]
2015-02-24T00:00:00
[ [ "Avila", "Artur", "" ], [ "Damanik", "David", "" ] ]
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711.4292
Christophe Le Poncin-Lafitte
Christophe Le Poncin-Lafitte and Pierre Teyssandier
Influence of mass multipole moments on the deflection of a light ray by an isolated axisymmetric body
9 pages. Submitted to Physical Review D
Phys.Rev.D77:044029,2008; Erratum-ibid.D77:069901,2008
10.1103/PhysRevD.77.044029 10.1103/PhysRevD.77.069901
null
astro-ph gr-qc
null
Future space astrometry missions are planned to measure positions and/or parallaxes of celestial objects with an accuracy of the order of the microarcsecond. At such a level of accuracy, it will be indispensable to take into account the influence of the mass multipole structure of the giant planets on the bending of light rays. Within the parametrized post-Newtonian formalism, we present an algorithmic procedure enabling to determine explicitly this influence on a light ray connecting two points located at a finite distance. Then we specialize our formulae in the cases where 1) the light source is located at space infinity, 2) both the light source and the observer are located at space infinity. We examine in detail the cases where the unperturbed ray is in the equatorial plane or in a meridian plane.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:18:27 GMT" } ]
2014-11-18T00:00:00
[ [ "Poncin-Lafitte", "Christophe Le", "" ], [ "Teyssandier", "Pierre", "" ] ]
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711.4293
Sarika Jalan
Fatihcan Atay, Sarika Jalan, J\"urgen Jost
Randomness, chaos, and structure
null
Complexity, 15 (1) pp. 29-35 (2009)
null
null
nlin.CD
null
We show how a simple scheme of symbolic dynamics distinguishes a chaotic from a random time series and how it can be used to detect structural relationships in coupled dynamics. This is relevant for the question at which scale in complex dynamics regularities and patterns emerge.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:25:27 GMT" } ]
2009-10-26T00:00:00
[ [ "Atay", "Fatihcan", "" ], [ "Jalan", "Sarika", "" ], [ "Jost", "Jürgen", "" ] ]
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711.4294
Ivan Dmitriev
I.A. Dmitriev and R.A. Suris
Quantum dot cascade laser: Arguments in favor
4 pages, 2 figures; Proceedings of MSS13 to be published in Physica E
null
10.1016/j.physe.2007.09.055
null
cond-mat.other
null
Quantum cascade lasers are recognized as propitious candidates for future terahertz optoelectronics. Here we demonstrate several definite advantages of quantum dot cascade structures over quantum well devices, which suffer fundamental performance limitations owing to continuous carrier spectrum. The discrete spectrum of quantum dots opens an opportunity to control the non-radiative relaxation and optical loss and also provides for more flexibility in the choice of an optical and electrical design of the laser.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:34:41 GMT" } ]
2007-11-28T00:00:00
[ [ "Dmitriev", "I. A.", "" ], [ "Suris", "R. A.", "" ] ]
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711.4295
Junegone Chay
Junegone Chay
Transverse-momentum-dependent parton distribution function in soft-collinear effective theory
25 pages, 6 figures, added references
null
null
MIT-CTP 3904
hep-ph
null
Transverse-momentum-dependent parton distribution functions are analyzed in semi-inclusive deep inelastic scattering at low transverse momentum using soft-collinear effective theory. The transverse-momentum-dependent parton distribution functions are defined on the lightcone without distorting the lightcone path nor adding additional soft Wilson lines. In this approach, the comparison between the integrated and unintegrated parton distribution functions becomes transparent. The procedure of computing radiative corrections in dimensional regularization is explained in detail, and the divergence, which is a product of infrared and ultraviolet divergence, is cancelled. The renormalization group equation for the transverse-momentum-dependent parton distribution functions is derived. It depends only on the relevant physical quantities and exhibits a nontrivial scaling behavior because the longitudinal momentum fraction and the transverse momentum are coupled in the renormalization group equation.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:30:02 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 19:30:48 GMT" } ]
2007-11-29T00:00:00
[ [ "Chay", "Junegone", "" ] ]
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711.4296
L\'aszl\'o Demk\'o
L. Demk\'o, I. K\'ezsm\'arki, G. Mih\'aly, N. Takeshita, Y. Tomioka, Y. Tokura
Multicritical end-point of the first-order ferromagnetic transition in colossal magnetoresistive manganites
4 pages, 4 figures
null
10.1103/PhysRevLett.101.037206
null
cond-mat.str-el
null
We have studied the bandwidth-temperature-magnetic field phase diagram of RE(0.55)Sr(0.45)MnO(3) colossal magnetoresistance manganites with ferromagnetic metallic (FM) ground state. The bandwidth (or equivalently the double exchange interaction) was controlled both via chemical substitution and hydrostatic pressure with a focus on the vicinity of the critical pressure p* where the character of the zero-field FM transition changes from first to second order. Below p* the first-order FM transition extends up to a critical magnetic field, H_cr. It is suppressed by pressure and approaches zero on the larger bandwidth side where the surface of the first-order FM phase boundary is terminated by a multicritical end-point (p*~32 kbar, T*~188 K, H*=0). The change in the character of the transition and the decrease of the CMR effect is attributed to the reduced CO/OO fluctuations.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:33:34 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 15:02:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Demkó", "L.", "" ], [ "Kézsmárki", "I.", "" ], [ "Mihály", "G.", "" ], [ "Takeshita", "N.", "" ], [ "Tomioka", "Y.", "" ], [ "Tokura", "Y.", "" ] ]
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711.4297
Mairan Teodoro
A. Damineli (1), D. J. Hillier (2), M. F. Corcoran (3 and 4), O. Stahl (5), J. H. Groh (1), J. Arias (8), M. Teodoro (1), N. Morrell (9), R. Gamen (7), F. Gonzalez (7), N. V. Leister (1), H. Levato (7), R. S. Levenhagen (1), M. Grosso (7), J. F. Albacete Colombo (6), G. Wallerstein (10) ((1) Instituto de Astronomia, Geof\'isica e Ci\^encias Atmosf\'ericas, Universidade de S\~ao Paulo, Brazil (2) Department of Physics and Astronomy, University of Pittsburgh, USA (3) CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, USA (4) Universities Space Research Association, USA (5) ZAH, Landessternwarte, Germany (6) Facultad de Ciencias Astronomicas y Geofisicas de La Plata (FCAGLP) (7) Complejo Astronomico El Leoncito, Argentina (8) Departamento de F\'isica, Universidad de La Serena, Chile (9) Las Campanas Observatory, Carnegie Observatories, Chile (10) Department of Astronomy, University of Washington, USA)
A multispectral view of the periodic events in eta Carinae
16 pages, 7 EPS figures, accepted for publication on MNRAS
null
10.1111/j.1365-2966.2008.13214.x
null
astro-ph
null
A full description of the 5.5-yr low excitation events in Eta Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first, the 'slow variation' component, is revealed by slow changes in the ionization level of circumstellar matter across the whole cycle and is caused by gradual changes in the wind-wind collision shock-cone orientation, angular opening and gaseous content. The second, the 'collapse' component, is restricted to around the minimum, and is due to a temporary global collapse of the wind-wind collision shock. High energy photons (E > 16 eV) from the companion star are strongly shielded, leaving the Weigelt objects at low ionization state for >6 months. High energy phenomena are sensitive only to the 'collapse', low energy only to the 'slow variation' and intermediate energies to both components. Simple eclipses and mechanisms effective only near periastron (e.g., shell ejection or accretion onto the secondary star) cannot account for the whole 5.5-yr cycle. We find anti-correlated changes in the intensity and the radial velocity of P Cygni absorption profiles in FeII 6455 and HeI 7065 lines, indicating that the former is associated to the primary and the latter to the secondary star. We present a set of light curves representative of the whole spectrum, useful for monitoring the next event (2009 January 11).
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:33:48 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 15:09:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Damineli", "A.", "", "3 and 4" ], [ "Hillier", "D. J.", "", "3 and 4" ], [ "Corcoran", "M. F.", "", "3 and 4" ], [ "Stahl", "O.", "" ], [ "Groh", "J. H.", "" ], [ "Arias", "J.", "" ], [ "Teodoro", "M.", "" ], [ "Morrell", "N.", "" ], [ "Gamen", "R.", "" ], [ "Gonzalez", "F.", "" ], [ "Leister", "N. V.", "" ], [ "Levato", "H.", "" ], [ "Levenhagen", "R. S.", "" ], [ "Grosso", "M.", "" ], [ "Colombo", "J. F. Albacete", "" ], [ "Wallerstein", "G.", "" ] ]
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711.4298
Svetoslav Ivanov
S. S. Ivanov, N. V. Vitanov
Steering quantum transitions between three crossing energy levels
10 pages, 6 figures
null
10.1103/PhysRevA.77.023406
null
quant-ph
null
We calculate the propagator and the transition probabilities for a coherently driven three-state quantum system. The energies of the three states change linearly in time, whereas the interactions between them are pulse-shaped. We derive a highly accurate analytic approximation by assuming independent pairwise Landau-Zener transitions occurring instantly at the relevant avoided crossings, and adiabatic evolution elsewhere. Quantum interferences are identified, which occur due to different possible evolution paths in Hilbert space between an initial and a final state. A detailed comparison with numerical results for Gaussian-shaped pulses demonstrates a remarkable accuracy of the analytic approximation. We use the analytic results to derive estimates for the half-width of the excitation profile, and for the parameters required for creation of a maximally coherent superposition of the three states. These results are of potential interest in ladder climbing in alkali atoms by chirped laser pulses, in quantum rotors, in transitions between Zeeman sublevels of a J=1 level in a magnetic field, and in control of entanglement of a pair of spin-1/2 particles. The results for the three-state system can be generalized, without essential difficulties, to higher dimensions.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:34:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Ivanov", "S. S.", "" ], [ "Vitanov", "N. V.", "" ] ]
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711.4299
Avatar Tulsi
Avatar Tulsi
Quantum computers can search rapidly by using almost any selective transformations
8 pages, Accepted for publication in PRA
null
10.1103/PhysRevA.78.022332
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The search problem is to find a state satisfying certain properties out of a given set. Grover's algorithm drives a quantum computer from a prepared initial state to the target state and solves the problem quadratically faster than a classical computer. The algorithm uses selective transformations to distinguish the initial state and target state from other states. It does not succeed unless the selective transformations are very close to phase-inversions. Here we show a way to go beyond this limitation. An important application lies in quantum error-correction, where the errors can cause the selective transformations to deviate from phase-inversions. The algorithms presented here are robust to errors as long as the errors are reproducible and reversible. This particular class of systematic errors arise often from imperfections in apparatus setup. Hence our algorithms offer a significant flexibility in the physical implementation of quantum search.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:39:39 GMT" }, { "version": "v2", "created": "Thu, 12 Jun 2008 12:22:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Tulsi", "Avatar", "" ] ]
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711.43
Alexander Kamenshchik
Alexander A. Andrianov, Francesco Cannata, Alexander Y. Kamenshchik and Daniele Regoli
Reconstruction of scalar potentials in two-field cosmological models
final version, to appear in JCAP
JCAP0802:015,2008
10.1088/1475-7516/2008/02/015
null
gr-qc astro-ph hep-th
null
We study the procedure of the reconstruction of phantom-scalar field potentials in two-field cosmological models. It is shown that while in the one-field case the chosen cosmological evolution defines uniquely the form of the scalar potential, in the two-field case one has an infinite number of possibilities. The classification of a large class of possible potentials is presented and the dependence of cosmological dynamics on the choice of initial conditions is investigated qualitatively and numerically for two particular models.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:42:15 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 17:59:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Andrianov", "Alexander A.", "" ], [ "Cannata", "Francesco", "" ], [ "Kamenshchik", "Alexander Y.", "" ], [ "Regoli", "Daniele", "" ] ]
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711.4301
E.G. van Putten
E.G. van Putten, I.M. Vellekoop, and A.P. Mosk
Spatial amplitude and phase modulation using commercial twisted nematic LCDs
10 pages, 6 figures
null
10.1364/AO.47.002076
null
physics.optics
null
We present a method for full spatial phase and amplitude control of a laser beam using a twisted nematic liquid crystal display combined with a spatial filter. By spatial filtering we combine four neighboring pixels into one superpixel. At each superpixel we are able to independently modulate the phase and the amplitude of light. We demonstrate experimentally the independent phase and amplitude modulation using this novel technique. Our technique does not impose special requirements on the spatial light modulator and allows precise control of fields even with imperfect modulators.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:44:01 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 16:23:36 GMT" } ]
2009-11-13T00:00:00
[ [ "van Putten", "E. G.", "" ], [ "Vellekoop", "I. M.", "" ], [ "Mosk", "A. P.", "" ] ]
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711.4302
Sergey Neshveyev
Sergey Neshveyev, Lars Tuset
Notes on the Kazhdan-Lusztig theorem on equivalence of the Drinfeld category and the category of Uq(g)-modules
40 pages
null
null
null
math.QA math.OA
null
We discuss the proof of Kazhdan and Lusztig of the equivalence of the Drinfeld category D(g,h) of g-modules and the category of finite dimensional Uq(g)-modules, q=exp(\pi ih), for h\in C\Q*. Aiming at operator algebraists the result is formulated as the existence for each h\in iR of a normalized unitary 2-cochain F on the dual \hat G of a compact simple Lie group G such that the convolution algebra of G with the coproduct twisted by F is *-isomorphic to the convolution algebra of the q-deformation G_q of G, while the coboundary of F^{-1} coincides with Drinfeld's KZ-associator defined via monodromy of the Knizhnik-Zamolodchikov equations.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 16:48:20 GMT" } ]
2007-11-28T00:00:00
[ [ "Neshveyev", "Sergey", "" ], [ "Tuset", "Lars", "" ] ]
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711.4303
Hiroaki Sugiyama
Hiroaki Sugiyama
More on Non-standard Interaction at MINOS
Talk given at 9th International Workshop on Neutrino Factories, Superbeams and Betabeams (NuFact07), Okayama, Japan, 6-11 Aug 2007
AIPConf.Proc.981:216-218,2008
10.1063/1.2898938
SISSA 88/2007/EP
hep-ph
null
We discuss about effects of the non-standard interaction of neutrinos with matter on the nu_e appearance search in the MINOS experiment. We consider the effects of the complex phase of the interaction and of the uncertainty on theta_23 also. We show that the oscillation probability can be so large that can not be explained by the ordinary oscillation. We show also how much constraints on the non-standard effects can be improved if the experiment does not observe nu_e appearance signal.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 17:09:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Sugiyama", "Hiroaki", "" ] ]
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711.4304
Thorsten Feldmann
M. Diehl (DESY Hamburg), Th. Feldmann (Univ. Siegen), P. Kroll (Univ. Wuppertal)
Form factors and other measures of strangeness in the nucleon
(22 pages, 19 figures, minor corrections, matches journal version)
Phys.Rev.D77:033006,2008
10.1103/PhysRevD.77.033006
DESY 07-209, SI-HEP-2007-18, WUB 07-11
hep-ph
null
We discuss the phenomenology of strange-quark dynamics in the nucleon, based on experimental and theoretical results for electroweak form factors and for parton densities. In particular, we construct a model for the generalized parton distribution that relates the asymmetry s(x)-sbar(x) between the longitudinal momentum distributions of strange quarks and antiquarks with the form factor F1^s(t), which describes the distribution of strangeness in transverse position space.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 17:10:17 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 14:24:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Diehl", "M.", "", "DESY Hamburg" ], [ "Feldmann", "Th.", "", "Univ. Siegen" ], [ "Kroll", "P.", "", "Univ.\n Wuppertal" ] ]
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711.4305
Karen Masters
Karen L. Masters (CfA), Christopher M. Springob (Washington State/NRL), John P. Huchra (CfA)
2MTF I. The Tully-Fisher Relation in the 2MASS J, H and K Bands
13 pages, 5 figures. AJ, accepted (scheduled for June 2008). v2 is as accepted by AJ and includes only minor textual changes from v1. v3 includes a 3 page erratum published as Masters et al. 2014. A coding error was discovered and corrected, resulting in small changes in the slope and offsets offsets of the TF relation. All qualitative results still hold. We apologise for the inconvenience
null
10.1088/0004-6256/135/5/1738
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The 2 Micron All-Sky Survey (2MASS) Tully-Fisher Survey (2MTF) aims to measure Tully-Fisher (TF) distances to all bright inclined spirals in the 2MASS Redshift Survey (2MRS). Essential to this project is a universal calibration of the TF relation in the 2MASS J (1.2 um), H (1.6 um) and K (2.2 um) bands. We present the first bias corrected or universal TF template in these bands. We find that the slope of the TF relation becomes steeper as the wavelength increases being close to L \propto v^4 in K-band and L \propto v^3.6 in J and H-bands. We also investigate the dependence on galaxy morphology showing that in all three bands the relation is steeper for later type spirals which also have a dimmer TF zeropoint than earlier type spirals. We correct the final relation to that for Sc galaxies. Finally we study the scatter from the TF relation fitting for a width dependent intrinsic scatter which is not found to vary significantly with wavelength.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 17:20:29 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 19:54:58 GMT" }, { "version": "v3", "created": "Thu, 10 Apr 2014 19:59:57 GMT" } ]
2014-04-11T00:00:00
[ [ "Masters", "Karen L.", "", "CfA" ], [ "Springob", "Christopher M.", "", "Washington\n State/NRL" ], [ "Huchra", "John P.", "", "CfA" ] ]
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711.4306
Romain Danneau
R. Danneau, F. Wu, M.F. Craciun, S. Russo, M.Y. Tomi, J. Salmilehto, A.F. Morpurgo, and P.J. Hakonen
Shot Noise in Ballistic Graphene
Phys. Rev. Lett. 100, 196802 (2008)
null
10.1103/PhysRevLett.100.196802
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have investigated shot noise in graphene field effect devices in the temperature range of 4.2--30 K at low frequency ($f$ = 600--850 MHz). We find that for our graphene samples with large width over length ratio $W/L$, the Fano factor $\mathfrak{F}$ reaches a maximum $\mathfrak{F} \sim$ 1/3 at the Dirac point and that it decreases strongly with increasing charge density. For smaller $W/L$, the Fano factor at Dirac point is significantly lower. Our results are in good agreement with the theory describing that transport at the Dirac point in clean graphene arises from evanescent electronic states.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 17:42:32 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 19:21:08 GMT" } ]
2008-07-01T00:00:00
[ [ "Danneau", "R.", "" ], [ "Wu", "F.", "" ], [ "Craciun", "M. F.", "" ], [ "Russo", "S.", "" ], [ "Tomi", "M. Y.", "" ], [ "Salmilehto", "J.", "" ], [ "Morpurgo", "A. F.", "" ], [ "Hakonen", "P. J.", "" ] ]
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711.4307
Jerome Martin
Jerome Martin and Jun'ichi Yokoyama
Generation of Large-Scale Magnetic Fields in Single-Field Inflation
33 pages, 5 figures
JCAP 0801:025,2008
10.1088/1475-7516/2008/01/025
null
astro-ph gr-qc hep-ph hep-th
null
We consider the generation of large-scale magnetic fields in slow-roll inflation. The inflaton field is described in a supergravity framework where the conformal invariance of the electromagnetic field is generically and naturally broken. For each class of inflationary scenarios, we determine the functional dependence of the gauge coupling that is consistent with the observations on the magnetic field strength at various astrophysical scales and, at the same time, avoid a back-reaction problem. Then, we study whether the required coupling functions can naturally emerge in well-motivated, possibly string-inspired, models. We argue that this is non trivial and can be realized only for a restricted class of scenarios. This includes power-law inflation where the inflaton field is interpreted as a modulus. However, this scenario seems to be consistent only if the energy scale of inflation is low and the reheating stage prolonged. Another reasonable possibility appears to be small field models since no back-reaction problem is present in this case but, unfortunately, the corresponding scenario cannot be justified in a stringy framework. Finally, large field models do not lead to sensible model building.
[ { "version": "v1", "created": "Tue, 27 Nov 2007 17:22:35 GMT" } ]
2009-06-23T00:00:00
[ [ "Martin", "Jerome", "" ], [ "Yokoyama", "Jun'ichi", "" ] ]
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