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802.0303
Matthew Lehner
M. J. Lehner, C.-Y. Wen, J.-H. Wang, S. L. Marshall, M. E. Schwamb, Z.-W. Zhang, F. B. Bianco, J. Giammarco, R. Porrata, C. Alcock, T. Axelrod, Y.-I. Byun, W. P. Chen, K. H. Cook, R. Dave, S.-K. King, T. Lee, H.-C. Lin and S.-Y. Wang
The Taiwanese-American Occultation Survey: The Multi-Telescope Robotic Observatory
11 pages, 11 figures
PASP 121 (2009) 138-152
10.1086/597516
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Taiwanese-American Occultation Survey (TAOS) operates four fully automatic telescopes to search for occultations of stars by Kuiper Belt Objects. It is a versatile facility that is also useful for the study of initial optical GRB afterglows. This paper provides a detailed description of the TAOS multi-telescope system, control software, and high-speed imaging.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 18:39:55 GMT" }, { "version": "v2", "created": "Mon, 16 Mar 2009 15:52:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Lehner", "M. J.", "" ], [ "Wen", "C. -Y.", "" ], [ "Wang", "J. -H.", "" ], [ "Marshall", "S. L.", "" ], [ "Schwamb", "M. E.", "" ], [ "Zhang", "Z. -W.", "" ], [ "Bianco", "F. B.", "" ], [ "Giammarco", "J.", "" ], [ "Porrata", "R.", "" ], [ "Alcock", "C.", "" ], [ "Axelrod", "T.", "" ], [ "Byun", "Y. -I.", "" ], [ "Chen", "W. P.", "" ], [ "Cook", "K. H.", "" ], [ "Dave", "R.", "" ], [ "King", "S. -K.", "" ], [ "Lee", "T.", "" ], [ "Lin", "H. -C.", "" ], [ "Wang", "S. -Y.", "" ] ]
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802.0304
Michael Marthaler
M. Marthaler, Gerd Sch\"on, Alexander Shnirman
Photon-Number Squeezing in Circuit Quantum Electrodynamics
5 pages, 5 figures
Phys. Rev. Lett. 101, 147001 (2008).
10.1103/PhysRevLett.101.147001
null
cond-mat.other cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A superconducting single-electron transistor (SSET) coupled to an anharmonic oscillator, e.g., a Josephson junction-L-C circuit, can drive the latter to a nonequilibrium photon number state. By biasing the SSET in a regime where the current is carried by a combination of inelastic quasiparticle tunneling and coherent Cooper-pair tunneling (Josephson quasiparticle cycle), cooling of the oscillator as well as a laser like enhancement of the photon number can be achieved. Here we show, that the cut-off in the quasiparticle tunneling rate due to the superconducting gap, in combination with the anharmonicity of the oscillator, may create strongly squeezed photon number distributions. For low dissipation in the oscillator nearly pure Fock states can be produced.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 21:21:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Marthaler", "M.", "" ], [ "Schön", "Gerd", "" ], [ "Shnirman", "Alexander", "" ] ]
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802.0305
David Delphenich
David Delphenich
Generalized Madelung transformations for quantum wave equations I: generalized spherical coordinates for field spaces
42 pages
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Madelung transformation of the space in which a quantum wave function takes its values is generalized from complex numbers to include field spaces that contain orbits of groups that are diffeomorphic to spheres. The general form for the resulting real wave equations then involves structure constants for the matrix algebra that is associated with the group action. The particular cases of the algebras of complex numbers, quaternions, and complex quaternions, which pertain to the Klein-Gordon equation, the relativistic Pauli equation, and the bi-Dirac equation, resp., are then discussed.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 21:48:37 GMT" } ]
2008-02-05T00:00:00
[ [ "Delphenich", "David", "" ] ]
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802.0306
Alastair Craw
Emiko Dupont
A Symplectic Isotopy of a Dehn Twist on CP^n x CP^{n+1}
20 pages, 6 figures
null
10.1112/jlms/jdp020
null
math.SG math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The complex manifold CP^n x CP^{n+1} with symplectic form \sigma_\mu=\sigma_{CP^n}+\mu\sigma_{CP^{n+1}}, where \sigma_{CP^n} and \sigma_{CP^{n+1}} are normalized Fubini-Study forms, n a natural number and \mu>1 a real number, contains a natural Lagrangian sphere L^{\mu}. We prove that the Dehn twist along L^{\mu} is symplectically isotopic to the identity for all \mu>1. This isotopy can be chosen so that it pointwise fixes a complex hypersurface in CP^n x CP^{n+1} and lifts to the blow-up of CP^n x CP^{n+1} along a complex n-dimensional submanifold.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 21:51:07 GMT" } ]
2014-02-26T00:00:00
[ [ "Dupont", "Emiko", "" ] ]
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802.0307
Ovidiu Munteanu
Ovidiu Munteanu
On a characterization of the complex hyperbolic space
null
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider a compact K\"{a}hler manifold $M^m$ with Ricci curvature lower bound $Ric_M\geq -2(m+1) .$ Assume that its universal cover $% \widetilde{M}$ has maximal bottom of spectrum $\lambda_1(\widetilde{M}%) =m^2.$ Then we prove that $\widetilde{M}$ is isometric to the complex hyperbolic space $\Bbb{CH}^m.$
[ { "version": "v1", "created": "Sun, 3 Feb 2008 22:05:08 GMT" } ]
2008-02-05T00:00:00
[ [ "Munteanu", "Ovidiu", "" ] ]
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802.0308
Bob Eisenberg
Bob Eisenberg
Bubble Gating Currents in Ionic Channels
Typo corrected
null
null
null
q-bio.BM q-bio.QM
null
Bubbles in ion channel proteins have been proposed to be the bistable gates that control current flow. Gating currents associated with channel gating would then be an electrical signature of bubble breaking and formation, arising from the change in dielectric coefficient as the bubble breaks or forms. A bubble would have a dielectric coefficient of 1. A filled bubble would have a dielectric coefficient (say) between 30 and 80. Transporters, pumps, and channels would be expected to have gating currents.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 22:19:22 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 11:06:35 GMT" } ]
2008-02-05T00:00:00
[ [ "Eisenberg", "Bob", "" ] ]
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802.0309
Fredy Ochoa
R. Martinez and F. Ochoa
Mass-matrix ansatz and constraints on $B_{s}^{0}-\bar{B}_{s}^{0}$ mixing in 331 models
To be published at Physical Revew D
Phys.Rev.D77:065012,2008
10.1103/PhysRevD.77.065012
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Comparing the theoretically predicted and measured values of the mass difference of the $B^{0}_{s}$ system, we estimate the lower bound on the mass of the $Z^{\prime}$ boson of models based on the $SU(3)_{c} \otimes SU(3)_{L} \otimes U(1)_X$ gauge group. By assuming zero-texture approaches of the quark mass matrices, we find the ratio of the measured value to the theoretical prediction from the Standard Model and the $Z^{\prime}$ contribution from the 331 models of the mass difference of the $B^{0}_{s}$ system. We find lower bounds on the $Z^{\prime}$ mass ranging between 1 TeV and 30 TeV for the two most popular 331 models, and four different zero-textures ans\"atze. The above results are expressed as a function of the weak angle associated to the $b-s-Z^{\prime}$ couplings.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 22:21:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Martinez", "R.", "" ], [ "Ochoa", "F.", "" ] ]
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802.031
Fredy Ochoa
N. Gutierrez, R. Martinez, F. Ochoa
$Z^{\prime}$ boson signal at Tevatron and LHC in a 331 model
null
null
null
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyse the possibilities to detect a new $Z^{\prime}$ boson in di-electron events at Tevatron and LHC in the framework of the 331 model with right-handed neutrinos. Using $p\bar{p}$ collision data collected by the CDF II detector at Fermilab Tevatron, we find that the 331 $Z^{\prime}$ boson is excluded with masses below 920 GeV. For an integrated luminosity of $100 fb^{-1}$ at LHC, and considering a central value $M_{Z^{\prime}}=1500$ GeV, we obtain the invariant mass distribution in the process $pp\to Z^{\prime}\to e^{+}e^{-}$, where a huge peak, corresponding to 800 signal events, is found above the SM background. The number of di-electron events vary from 10000 to 1 in the mass range of $M_{Z^{\prime}}=1000-5000$ GeV.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 22:36:18 GMT" } ]
2008-02-05T00:00:00
[ [ "Gutierrez", "N.", "" ], [ "Martinez", "R.", "" ], [ "Ochoa", "F.", "" ] ]
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802.0311
Guendelman Eduardo I
E.I. Guendelman
Photon and Axion Splitting in an Inhomogeneous Magnetic Field
9 pages, latex
Phys.Lett.B662:445-448,2008
10.1016/j.physletb.2008.03.050
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The axion photon system in an external magnetic field, when the direction of propagation of axions and photons is orthogonal to the direction of the external magnetic field, displays a continuous axion-photon duality symmetry in the limit the axion mass is neglected. The conservation law that follow in this effective 2+1 dimensional theory from this symmetry is obtained. The magnetic field interaction is seen to be equivalent to first order to the interaction of a complex charged field with an external electric potential, where this ficticious "electric potential" is proportional to the external magnetic field. This allows one to solve for the scattering amplitudes using already known scalar QED results. From the scalar QED analog the axion and the photon are symmetric and antisymmetric combinations of particle and antiparticle. If one considers therefore scattering experiments in which the two spatial dimensions of the effective theory are involved non trivially, one observes that both particle and antiparticle components of photons and axions are preferentially scattered in different directions, thus producing the splitting or decomposition of the photon and axion into their particle and antiparticle components in an inhomogeneous magnetic field. This observable in principle effect is of first order in the axion photon coupling, unlike the "light shining through a wall phenomena ", which is second order.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 22:39:24 GMT" } ]
2010-10-27T00:00:00
[ [ "Guendelman", "E. I.", "" ] ]
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802.0312
Jaroslaw Zalesny
Jaroslaw Zalesny
The simple complex numbers
LateX, 4 figures
null
null
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new simple geometrical interpretation of complex numbers is presented. It differs from their usual interpretation as points in the complex plane. From the new point of view the complex numbers are rather operations on vectors than points. Moreover, in this approach the real, imaginary and complex numbers have similar interpretation. They are simply some operations on vectors. The presented interpretation is simpler, more natural, and better adjusted to possible applications in geometry and physics than the usual one, especially for describing rotations in a plane. The relation of the new approach to the usual interpretation and especially to the notion of complex plane is also clarified in the paper. The new interpretation of complex numbers gives new insight into their applications in physics, which is demonstrated by some elementary examples in mechanics and optics
[ { "version": "v1", "created": "Sun, 3 Feb 2008 23:26:25 GMT" } ]
2008-02-05T00:00:00
[ [ "Zalesny", "Jaroslaw", "" ] ]
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802.0313
Damien James Martin
Jamison Galloway, Damien Martin and David Stancato
Comments on "Gauge Fields and Unparticles"
7 pages, comment on arXiv:0801.0892; references added
null
null
null
hep-th hep-ph
null
The derivation of Feynman rules for unparticles carrying standard model quantum numbers is discussed. In particular, this note demonstrates that an application of Mandelstam's approach to constructing a gauge-invariant action reproduces for unparticles the vertices one obtains through the usual minimal coupling scheme; other non-trivial requirements are satisfied as well. This approach is compared to an alternative method 0801.0892 that has recently been constructed by A. L. Licht.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 23:33:04 GMT" }, { "version": "v2", "created": "Sat, 9 Feb 2008 00:26:25 GMT" } ]
2008-03-02T00:00:00
[ [ "Galloway", "Jamison", "" ], [ "Martin", "Damien", "" ], [ "Stancato", "David", "" ] ]
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802.0314
Fran\c{c}ois Nicolas
Morris Michael and Francois Nicolas and Esko Ukkonen
On the complexity of finding gapped motifs
Published in Journal of Discrete Algorithms
null
10.1016/j.jda.2009.12.001
null
cs.CC cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 00:08:40 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 09:12:24 GMT" }, { "version": "v3", "created": "Fri, 4 Dec 2009 14:19:13 GMT" }, { "version": "v4", "created": "Wed, 10 Feb 2010 19:26:58 GMT" }, { "version": "v5", "created": "Wed, 18 Aug 2010 01:00:49 GMT" }, { "version": "v6", "created": "Wed, 1 Sep 2010 13:21:53 GMT" } ]
2010-09-02T00:00:00
[ [ "Michael", "Morris", "" ], [ "Nicolas", "Francois", "" ], [ "Ukkonen", "Esko", "" ] ]
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802.0315
Alexander Bolonkin
Alexander Bolonkin, Joseph Friedlander
Protection of Cities from Small Rockets, Missiles, Projectiles and Mortar Shells
21 pages, 10 figures, 2 tables
null
null
null
physics.gen-ph physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The authors suggest a low cost closed AB-Dome, which may protect small cities such as Sederot from rockets, mortar shells, chemical and biological weapons. The offered AB-Dome is also very useful in peacetime because it protects the city from outside weather (violent storms, hail) and creates a fine climate within the Dome. The roughly hemispherical AB-Dome is a gigantic inflated thin transparent film, located at altitude up to 1 - 5 kilometers, which converts the city into a closed-loop air system. The film may be armored with a basalt or steel grille or cloth pocket-retained stones that destroy (by collision or detonation) incoming rockets, shells and other projectiles. Such an AB-Dome would even protect the city in case of a third-party nuclear war involving temporary poisoning of the Earth atmosphere by radioactive dust. The building of the offered dome is easy; the film spreads on the ground, the fan engines turn on and the cover rises to the needed altitude and is supported there by a small internal overpressure. The offered method is cheaper by thousands of times than protection of a city by current anti-rocket systems. The AB-Dome may be also used (height is up to 1-5 and more kilometers) for TV, communication, long distance location, tourism, suspended high speed and altitude windmills (energy), illumination and entertainment (projected messages and pictures). The authors developed the theory of AB-Dome, made estimations, computations and computed a typical project. Discussion and results are at the end of the article.
[ { "version": "v1", "created": "Sun, 3 Feb 2008 23:57:58 GMT" } ]
2008-02-05T00:00:00
[ [ "Bolonkin", "Alexander", "" ], [ "Friedlander", "Joseph", "" ] ]
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802.0316
Yuan Xu
Yuan Xu
Fourier series and approximation on hexagonal and triangular domains
19 pages, 2 figures
null
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several problems on Fourier series and trigonometric approximation on a hexagon and a triangle are studied. The results include Abel and Ces\`aro summability of Fourier series, degree of approximation and best approximation by trigonometric functions, both direct and inverse theorems. One of the objective of this study is to demonstrate that Fourier series on spectral sets enjoy a rich structure that allow an extensive theory for Fourier expansions and approximation.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 00:04:44 GMT" } ]
2008-02-05T00:00:00
[ [ "Xu", "Yuan", "" ] ]
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802.0317
Adam Rennie
A. L. Carey, A. Rennie, K. Tong
Spectral flow invariants and twisted cyclic theory from the Haar state on SU_q(2)
25 pages, 1 figure
null
10.1016/j.geomphys.2009.07.005
null
math.OA math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [CPR2], we presented a K-theoretic approach to finding invariants of algebras with no non-trivial traces. This paper presents a new example that is more typical of the generic situation. This is the case of an algebra that admits only non-faithful traces, namely SU_q(2), and also KMS states. Our main results are index theorems (which calculate spectral flow), one using ordinary cyclic cohomology and the other using twisted cyclic cohomology, where the twisting comes from the generator of the modular group of the Haar state. In contrast to the Cuntz algebras studied in [CPR2], the computations are considerably more complex and interesting, because there are nontrivial `eta' contributions to this index.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 00:15:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Carey", "A. L.", "" ], [ "Rennie", "A.", "" ], [ "Tong", "K.", "" ] ]
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802.0318
Janka Petravic
Janka Petravic
Force autocorrelation function in linear response theory and the origin of friction
24 pages text and figures
null
10.1063/1.2972977
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vanishing of the equilibrium Green-Kubo fluctuation expression for the friction coefficient of a massive particle moving in a finite-volume liquid is usually interpreted as an unphysical consequence of the finite volume. Here I show that it is a physical consequence of the finite mass of the rest of the system, which allows it to be dragged by the moving particle. As a consequence, it is sufficient to have two infinite masses in the liquid for the friction coefficient to be finite. In addition, I give the physical interpretation of different friction coefficients for two infinite-mass particles moving in the liquid.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 00:16:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Petravic", "Janka", "" ] ]
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802.0319
Cheng-Wei Chiang
Abdesslam Arhrib, Rachid Benbrik, and Cheng-Wei Chiang
Probing triple Higgs couplings of the Two Higgs Doublet Model at Linear Collider
21 pages and 9 figures; one figure and some discussions added, version to appear in PRD
Phys.Rev.D77:115013,2008
10.1103/PhysRevD.77.115013
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study double Higgs production at the future Linear Collider in the framework of the Two Higgs Doublet Models through the following channels: $e^+e^- \to \Phi_i \Phi_j Z$, $\Phi_i=h^0, H^0, A^0, H^\pm$. All these processes are sensitive to triple Higgs couplings. Hence observations of them provide information on the triple Higgs couplings that help reconstructing the scalar potential. We also discuss the double Higgs-strahlung $e^+e^- \to h^0 h^0 Z$ in the decoupling limit where $h^0$ mimics the SM Higgs boson. The processes $e^+e^- \to h^0 h^0 Z$ and $e^+e^- \to h^0 H^0 Z$ are also discussed in the fermiophobic limit where distinctive signatures such as $4\gamma +X$, $2\gamma +X$ and $6\gamma +X$ are expected in the Type-I Two Higgs Doublet Model.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 00:49:31 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 10:16:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Arhrib", "Abdesslam", "" ], [ "Benbrik", "Rachid", "" ], [ "Chiang", "Cheng-Wei", "" ] ]
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802.032
Dennis DeTurck
Dennis DeTurck and Herman Gluck
Linking integrals in the n-sphere
14 pages, 2 figures
null
null
null
math.GT math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let K and L be disjoint closed oriented submanifolds of the n-sphere, with dimensions adding up to n-1. We define a map from their join K*L to the n-sphere whose degree up to sign equals their linking number, and then use this to find the desired linking integral.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 01:25:44 GMT" } ]
2008-02-05T00:00:00
[ [ "DeTurck", "Dennis", "" ], [ "Gluck", "Herman", "" ] ]
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802.0321
Cristina Manuel
Massimo Mannarelli and Cristina Manuel
Transport theory for cold relativistic superfluids from an analogue model of gravity
14 pages
Phys.Rev.D77:103014,2008
10.1103/PhysRevD.77.103014
null
hep-ph astro-ph gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We write a covariant transport equation for the phonon excitations of a relativistic superfluid valid at small temperatures. The hydrodynamical equations for this system are derived from the effective field theory associated to the superfluid phonons. We describe how to construct the kinetic theory for the phonon quasiparticles using a relativistic generalization of the analogue model of gravity developed by Unruh. This gravity analogy relies on the equivalence between the action of a phonon field moving in a superfluid background with that of a boson propagating in a given curved space-time. Exploiting this analogy we obtain continuity equations for the phonon current, entropy and energy-momentum tensor in a covariant form, valid in any reference frame. Our aim is to shed light on some aspects of transport phenomena of relativistic superfluidity. In particular, we are interested in the low temperature regime of the color flavor locked phase, which is a color superconducting and superfluid phase of high density QCD that may be realized in the core of neutron stars.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 14:41:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Mannarelli", "Massimo", "" ], [ "Manuel", "Cristina", "" ] ]
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802.0322
David Kubiznak
Valeri P. Frolov, David Kubiznak
Higher-Dimensional Black Holes: Hidden Symmetries and Separation of Variables
33 pages, no figures, updated references and corrected typos
Class.Quant.Grav.25:154005,2008
10.1088/0264-9381/25/15/154005
Alberta-Thy-02-08
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we discuss hidden symmetries in rotating black hole spacetimes. We start with an extended introduction which mainly summarizes results on hidden symmetries in four dimensions and introduces Killing and Killing-Yano tensors, objects responsible for hidden symmetries. We also demonstrate how starting with a principal CKY tensor (that is a closed non-degenerate conformal Killing-Yano 2-form) in 4D flat spacetime one can "generate" 4D Kerr-NUT-(A)dS solution and its hidden symmetries. After this we consider higher-dimensional Kerr-NUT-(A)dS metrics and demonstrate that they possess a principal CKY tensor which allows one to generate the whole tower of Killing-Yano and Killing tensors. These symmetries imply complete integrability of geodesic equations and complete separation of variables for the Hamilton-Jacobi, Klein-Gordon, and Dirac equations in the general Kerr-NUT-(A)dS metrics.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 01:54:00 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 01:56:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Frolov", "Valeri P.", "" ], [ "Kubiznak", "David", "" ] ]
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802.0323
Marina Chugunova
Marina Chugunova, Vladimir Strauss
Factorization of the Indefinite Convection-Diffusion Operator
8 pages
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that some non-self-adjoint differential operator admits factorization and apply this new representation of the operator to construct explicitly its domain. We also show that this operator is J-self-adjoint in some Krein space.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 01:56:10 GMT" } ]
2008-02-05T00:00:00
[ [ "Chugunova", "Marina", "" ], [ "Strauss", "Vladimir", "" ] ]
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802.0324
C.Clare Worley
C.C.Worley, P.L.Cottrell and E.C.Wylie de Boer
s- and r-process element abundances in the CMD of 47 Tucanae using the Robert Stobie Spectrograph on SALT
7 pages, 11 figures
null
10.1071/AS07031
null
astro-ph
null
A recent study by Wylie et al 2006 has revealed that s-process element abundances are enhanced relative to iron in both red giant branch and asymptotic giant branch stars of 47 Tucanae. A more detailed investigation into s-process element abundances throughout the colour-magnitude diagram of 47 Tucanae is vital in order to determine whether the observed enhancements are intrinsic to the cluster. This paper explores this possibility through observational and theoretical means. The visibility of s- and r-process element lines in synthetic spectra of giant and dwarf stars throughout the colour magnitude diagram of 47 Tucanae has been explored. It was determined that a resolving power of 10 000 was sufficient to observe s-process element abundance variations in globular cluster giant branch stars. These synthetic results were compared with the spectra of eleven 47 Tucanae giant branch stars observed during the performance verification of the Robert Stobie Spectrograph on the Southern African Large Telescope. Three s-process elements, Zr, Ba, Nd, and one r-process element, Eu, were investigated. No abundance variations were found such that [X/Fe] = 0.0 +/- 0.5 dex. It was concluded that this resolving power, R ~ 5000, was not sufficient to obtain exact abundances but upper limits on the s-process element abundances could be determined.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 02:34:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Worley", "C. C.", "" ], [ "Cottrell", "P. L.", "" ], [ "de Boer", "E. C. Wylie", "" ] ]
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802.0325
Yue Chongxing
Chong-Xing Yue, Li Ding, Wei Ma
The new charged gauge boson $W'$ and the subprocess $eq\to\nu q'$ at $e^{+}e^{-}$ and $ep$ colliders
18 pages, 6 figures, typos corrected, references added
Eur.Phys.J.C55:615-622,2008
10.1140/epjc/s10052-008-0618-2
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the framework of the little Higgs models and the three-site Higgsless model, we discuss the contributions of the new charged gauge boson $W'$ to the process $eq\to\nu q'$ and the possibility of detecting $W'$ via this process in future high energy linear $e^{+}e^{-}$ collider $(ILC)$ and $ep$ collider $(THERA)$ experiments. Our numerical results show that the process $eq\to\nu q'$ is rather sensitive to the coupling $W'ff'$ and one can use this process to distinguish different new physics models in future $ILC$ and $THERA$ experiments.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 02:01:51 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 11:36:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Yue", "Chong-Xing", "" ], [ "Ding", "Li", "" ], [ "Ma", "Wei", "" ] ]
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802.0326
David Garcia-Alvarez
D.Garcia-Alvarez (Imperial College London), J.J.Drake (SAO), V.L.Kashyap (SAO), L.Lin (SAO), B.Ball (SAO)
Coronal Structure and Abundances in Young Fast Rotators
22 pages, 8 figures, 6 tables. Accepted by ApJ
null
10.1086/587611
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
AB Dor, Speedy Mic and Rst137B are in their early post-T Tauri evolutionary phase (<100Myr), at the age of fastest rotation in the life of late-type stars. They straddle the coronal saturation-supersaturation boundary first defined by young stars in open clusters. High resolution Chandra X-ray spectra have been analysed to study their coronal properties as a function of coronal activity parameters Rossby number, $L_X/L_{bol}$ and a coronal temperature index. Plasma emission measure distributions as a function of temperature show broad peaks at T~10e7K. Differences between stars suggest that as supersaturation is reached the DEM slope below the temperature of peak DEM becomes shallower, while the DEM drop-off above this temperature becomes more pronounced. A larger sample comprising our three targets and 22 active stars studied in the recent literature reveals a general increase of plasma at T>10e7 toward the saturated-supersaturated boundary but a decline beyond this among supersaturated stars. All three of the stars studied in detail here show lower coronal abundances of the low FIP elements Mg, Si and Fe, relative to the high FIP elements S, O and Ne, as compared to the solar mixture. The coronal Fe abundances of the stellar sample are inversely correlated with Lx/Lbol, declining slowly with rising Lx/Lbol, but with a much more sharp decline at Lx/Lbol>3x10e-4. For dwarfs the Fe abundance is also well-correlated with Rossby number. The coronal O/Fe ratios for dwarfs show a clear increase with decreasing Rossby number, apparently reaching saturation at [O/Fe]=0.5 at the coronal supersaturation boundary. Similar increases in O/Fe with increasing coronal temperature and $L_X/L_{bol}$ are seen.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 02:11:36 GMT" } ]
2015-05-13T00:00:00
[ [ "Garcia-Alvarez", "D.", "", "Imperial College London" ], [ "Drake", "J. J.", "", "SAO" ], [ "Kashyap", "V. L.", "", "SAO" ], [ "Lin", "L.", "", "SAO" ], [ "Ball", "B.", "", "SAO" ] ]
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802.0327
Adam Showman
Adam P. Showman, Curtis S. Cooper, Jonathan J. Fortney, and Mark S. Marley
Atmospheric Circulation of Hot Jupiters: Three-dimensional circulation models of HD 209458b and HD 189733b with Simplified Forcing
17 pages, 14 figures, submitted for publication in ApJ
null
10.1086/589325
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present global, three-dimensional numerical simulations of the atmospheric circulation on HD 209458b and HD 189733b and calculate the infrared spectra and light curves predicted by these simulations, which we compare with available observations. Radiative heating/cooling is parameterized with a simplified Newtonian relaxation scheme. Our simulations develop day-night temperature contrasts that vary strongly with pressure. At low pressure (<10 mbar), air flows from the substellar point toward the antistellar point, both along the equator and over the poles. At deeper levels, the flow develops an eastward equatorial jet with speeds of 3-4 km/sec, with weaker westward flows at high latitudes. This basic flow pattern is robust to variations in model resolution, gravity, radiative time constant, and initial temperature structure. Nightside spectra show deep absorption bands of H2O, CO, and/or CH4, whereas on the dayside these absorption bands flatten out or even flip into emission. This results from the strong effect of dynamics on the vertical temperature-pressure structure; the temperature decreases strongly with altitude on the nightside but becomes almost isothermal on the dayside. In Spitzer bandpasses, our predicted planet-to-star flux ratios vary by a factor of 2-10 with orbital phase, depending on the wavelength and chemistry. For HD 189733b, where a detailed 8-micron light curve has been obtained, we correctly produce the observed phase offset of the flux maximum, but we do not explain the flux minimum and we overpredict the total flux variation. This discrepancy likely results from the simplifications inherent in the Newtonian relaxation scheme and provides motivation for incorporating realistic radiative transfer in future studies.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 02:28:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Showman", "Adam P.", "" ], [ "Cooper", "Curtis S.", "" ], [ "Fortney", "Jonathan J.", "" ], [ "Marley", "Mark S.", "" ] ]
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802.0328
Yunkyu Bang
Yunkyu Bang
Effects of phonon interaction on the pairing in the high-T$c$ superconductors
9 pages, 10 figures
Phys. Rev. B 78, 075116 (2008)
10.1103/PhysRevB.78.075116
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effects of phonon interaction on the superconducting pairing in the background of a d-wave gap, mediated by antiferromagnetic (AFM) spin fluctuations, using coupled BCS gap equations. We found that phonon interaction can induce a s-wave component to the d-wave gap in the (D+S) form with an interaction anisotropy and in the (D+$i$S) form without anisotropy, respectively. In either case, however, T$_c$ is not enhanced compared to the pure d-wave pairing without phonon interaction. On the other hand, anisotropic phonon interaction can dramatically enhance the d-wave pairing itself and therefore T$_c$, together with the AFM spin fluctuation interaction. This (D$_{AFM}$ + D$_{ph}$) type pairing exhibits strongly reduced isotope coefficient despite the large enhancement of T$_c$ by phonon interaction. Finally, we study the combined type of (D$_{AFM}$ + D$_{ph}$ +$i$S)) gap and calculate the penetration depth and specific heat to be compared with the experiments.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 03:00:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Bang", "Yunkyu", "" ] ]
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802.0329
Tohya Hiroshima
Tohya Hiroshima
Bound entangled states with non-positive partial transpose exist
This paper has been withdrawn by the author, due a crucial error in the optimization. For the last one month I have been trying to remove the error, but it seems to take a lot of time so I decided to withdraw this paper for the moment
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the author, due a crucial error in the optimization. For the last one month I have been trying to remove the error, but it seems to take a lot of time so I decided to withdraw this paper for the moment.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 03:02:26 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 05:02:14 GMT" }, { "version": "v3", "created": "Mon, 10 Mar 2008 10:32:26 GMT" }, { "version": "v4", "created": "Mon, 31 Mar 2008 03:27:28 GMT" }, { "version": "v5", "created": "Wed, 7 May 2008 08:02:38 GMT" } ]
2008-05-07T00:00:00
[ [ "Hiroshima", "Tohya", "" ] ]
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802.033
Stefano Ansoldi
Stefano Ansoldi
Spherical black holes with regular center: a review of existing models including a recent realization with Gaussian sources
LaTeX, 36 pages, 10 figures. To appear in the proceedings of "BH2, Dynamics and Thermodynamics of Blackholes and Naked Singularities", May 10-12 2007, Milano, Italy (conference website: http://www.mate.polimi.it/bh2)
null
null
KUNS-2108
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review, in a historical perspective, some results about black hole spacetimes with a regular center. We then see how their properties are realized in a specific solution that recently appeared; in particular we analyze in detail the (necessary) violation of the strong energy condition.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 03:13:00 GMT" } ]
2008-02-05T00:00:00
[ [ "Ansoldi", "Stefano", "" ] ]
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802.0331
George Lowther
George Lowther
Nondifferentiable functions of one-dimensional semimartingales
Published in at http://dx.doi.org/10.1214/09-AOP476 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2010, Vol. 38, No. 1, 76-101
10.1214/09-AOP476
IMS-AOP-AOP476
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider decompositions of processes of the form $Y=f(t,X_t)$ where $X$ is a semimartingale. The function $f$ is not required to be differentiable, so It\^{o}'s lemma does not apply. In the case where $f(t,x)$ is independent of $t$, it is shown that requiring $f$ to be locally Lipschitz continuous in $x$ is enough for an It\^{o}-style decomposition to exist. In particular, $Y$ will be a Dirichlet process. We also look at the case where $f(t,x)$ can depend on $t$, possibly discontinuously. It is shown, under some additional mild constraints on $f$, that the same decomposition still holds. Both these results follow as special cases of a more general decomposition which we prove, and which applies to nondifferentiable functions of Dirichlet processes. Possible applications of these results to the theory of one-dimensional diffusions are briefly discussed.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 03:22:04 GMT" }, { "version": "v2", "created": "Sun, 17 Aug 2008 20:16:04 GMT" }, { "version": "v3", "created": "Tue, 26 Jan 2010 09:15:56 GMT" } ]
2010-01-26T00:00:00
[ [ "Lowther", "George", "" ] ]
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802.0332
Boldizsar Kalmar
Boldizsar Kalmar
Cobordisms of fold maps of 4-manifolds into the space
11 pages, revised version
null
null
null
math.GT math.AT
null
We compute the oriented cobordism group of fold maps of 4-manifolds into the space with all the possible restrictions (and also with no restriction) to the singular fibers. We also give geometric invariants which describe completely the cobordism group of fold maps.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 15:45:24 GMT" }, { "version": "v2", "created": "Sun, 23 Mar 2008 14:02:01 GMT" }, { "version": "v3", "created": "Mon, 12 May 2008 16:12:53 GMT" } ]
2008-05-12T00:00:00
[ [ "Kalmar", "Boldizsar", "" ] ]
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802.0333
Lan Zhou
Yu Guo, Lan Zhou, Le-Man Kuang, C.P. Sun
Magneto-Optical Stern-Gerlach Effect in Atomic Ensemble
7 pages, 5 figures
Phys. Rev. A 78, 013833 (2008)
10.1103/PhysRevA.78.013833
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the birefringence of the quantized polarized light in a magneto-optically manipulated atomic ensemble as a generalized Stern-Gerlach Effect of light. To explain this engineered birefringence microscopically, we derive an effective Shr\"odinger equation for the spatial motion of two orthogonally polarized components, which behave as a spin with an effective magnetic moment leading to a Stern-Gerlach split in an nonuniform magnetic field. We show that electromagnetic induced transparency (EIT) mechanism can enhance the magneto-optical Stern-Gerlach effect of light in the presence of a control field with a transverse spatial profile and a inhomogeneous magnetic field.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 05:11:34 GMT" }, { "version": "v2", "created": "Mon, 26 May 2008 03:47:30 GMT" }, { "version": "v3", "created": "Wed, 20 Aug 2008 14:18:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Guo", "Yu", "" ], [ "Zhou", "Lan", "" ], [ "Kuang", "Le-Man", "" ], [ "Sun", "C. P.", "" ] ]
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802.0334
Masashi Shiraishi
Ryo Nouchi, Haruo Tomita, Akio Ogura, Masashi Shiraishi, Hiromichi Kataura
Logic Ciucuits Using Solution-processed Single-walled Carbon Nanotue Transistors
12 PAGES, 3 FIGURES
Applied Physics Letters 92, 253507 (2008).
10.1063/1.2949686
null
cond-mat.mtrl-sci cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This letter reports on the realization of logic circuits employing solution-processed networks of single-walled carbon nanotubes. We constructed basic logic gates (inverter, NAND and NOR) with n- and p-type field-effect transistors fabricated by solution-based chemical doping. Complementary metal-oxide-semiconductor inverters exhibited voltage gains of up to 20, which illustrates the great potential of carbon nanotube networks for printable flexible electronics.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 05:13:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Nouchi", "Ryo", "" ], [ "Tomita", "Haruo", "" ], [ "Ogura", "Akio", "" ], [ "Shiraishi", "Masashi", "" ], [ "Kataura", "Hiromichi", "" ] ]
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802.0335
Motoki Kino
M. Kino (ISAS/Jaxa), F. Takahara (Osaka Univ.)
Invisible Plasma Content in Blazars? The Case of Markarian 421
4 pages, 2 figure for the proceedings of 'Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technology' (3-7 December 2007, ISAS/JAXA, Sagamihara, Japan)
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Invisible plasma content in blazar jets such as protons and/or thermal electron-positron ($e^{\pm}$) pairs is explored through combined arguments of dynamical and radiative processes. By comparing physical quantities required by the internal shock model with those obtained through the observed radio-to-gamma-ray spectra for Mrk 421, we find the existence of a copious amount of invisible plasma in the jet. We speculate that the blazar sequence could arise from variations of total amount and/or blending ratio of $e^{\pm}$ pair and electron-proton plasma.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 05:34:47 GMT" } ]
2008-02-05T00:00:00
[ [ "Kino", "M.", "", "ISAS/Jaxa" ], [ "Takahara", "F.", "", "Osaka Univ." ] ]
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802.0336
Minzu Wang
The Belle Collaboration: J. H. Chen, M.-Z. Wang, et al
Observation of B0 to p pbar K*0 with a large K*0 polarization
11 pages, 4 figures (8 figure files), submitted to Phys.Rev.Lett
Phys.Rev.Lett.100:251801,2008
10.1103/PhysRevLett.100.251801
Belle Preprint 2008-5; KEK Preprint 2007-77
hep-ex
null
We observe the decay B0 to p pbar K*0 with a branching fraction of (1.18^{+0.29}_{-0.25} (stat.) \pm 0.11 (syst.)) \times 10^{-6}. The statistical significance is 7.2 sigma for the signal in the low ppbar mass region. We study the decay dynamics of B0 to p pbar K*0 and compare it with B+ to p pbar K*+. The K*0 meson is found to be almost 100% polarized (with a fraction of (101 \pm 13 \pm 3)% in the helicity zero state), while the K*+ meson has a (32 \pm 17 \pm 9)% fraction in the helicity zero state. The direct CP asymmetries for B0 to p pbar K*0 and B+ to p pbar K*+ are measured to be -0.08\pm 0.20\pm 0.02 and -0.01\pm 0.19\pm 0.02, respectively. We also study the characteristics of the low mass ppbar enhancements near threshold and the associated angular distributions. In addition, we report improved measurements of the branching fractions BF(B+ to p pbar K*+) = (3.38^{+0.73}_{-0.60} \pm 0.39) \times 10^{-6} and BF(B0 to p pbar K0) = (2.51^{+0.35}_{-0.29} \pm 0.21) \times 10^{-6}, which supersede our previous measurements. These results are obtained from a 492 fb^{-1} data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 06:27:24 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 03:34:37 GMT" }, { "version": "v3", "created": "Fri, 30 May 2008 07:46:19 GMT" } ]
2009-02-19T00:00:00
[ [ "The Belle Collaboration", "", "" ], [ "Chen", "J. H.", "" ], [ "Wang", "M. -Z.", "" ] ]
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802.0337
Tatsuhiko Yagasaki
Taras Banakh, Kotaro Mine, Katsuro Sakai and Tatsuhiko Yagasaki
Homeomorphism and diffeomorphism groups of non-compact manifolds with the Whitney topology
21 pages, Sections 3, 5.2, 5.3, 6, 7 in the previous version (arXiv: 0802.0337v1) will be included in another paper cited as Ref. [6]
null
null
null
math.GT math.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a non-compact n-manifold M let H(M) denote the group of homeomorphisms of M endowed with the Whitney topology and H_c(M) the subgroup of H(M) consisting of homeomorphisms with compact support. It is shown that the group H_c(M) is locally contractible and the identity component H_0(M) of H(M) is an open normal subgroup in H_c(M). This induces the topological factorization H_c(M) \approx H_0(M) \times \M_c(M) for the mapping class group \M_c(M) = H_c(M)/H_0(M) with the discrete topology. Furthermore, for any non-compact surface M, the pair (H(M), H_c(M)) is locally homeomorphic to (\square^w l_2,\cbox^w l_2) at the identity id_M of M. Thus the group H_c(M) is an (l_2 \times R^\infty)-manifold. We also study topological properties of the group D(M) of diffeomorphisms of a non-compact smooth n-manifold M endowed with the Whitney C^\infty-topology and the subgroup D_c(M) of D(M) consisting of all diffeomorphisms with compact support. It is shown that the pair (D(M),D_c(M)) is locally homeomorphic to (\square^w l_2, \cbox^w l_2) at the identity id_M of M. Hence the group D_c(M) is a topological (l_2 \times R^\infty)-manifold for any dimension n.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 06:29:49 GMT" }, { "version": "v2", "created": "Wed, 24 Feb 2010 03:48:25 GMT" } ]
2010-02-24T00:00:00
[ [ "Banakh", "Taras", "" ], [ "Mine", "Kotaro", "" ], [ "Sakai", "Katsuro", "" ], [ "Yagasaki", "Tatsuhiko", "" ] ]
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802.0338
Motomu Tsuda
Kazunari Shima and Motomu Tsuda
On N = 2 superfield for N = 2 vector supermultiplet in two dimensional spacetime
8 pages, some discussions changed, references added
Mod.Phys.Lett.A23:1167-1173,2008
10.1142/S0217732308027096
null
hep-th
null
We focus on the superfield formulation for a N = 2 vector supermultiplet in two dimensional spacetime and explicitly show that the Wess-Zumino gauge condition for a N = 2 superfield is compatible with familiar SUSY (plus U(1) gauge) transformations for the vector supermultiplet. N = 2 SUSY invariant mass and Yukawa interaction terms for the vector supermultiplet are also constructed from the superfield explicitly in addition to a free (kinetic) action.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 06:34:03 GMT" }, { "version": "v2", "created": "Sat, 16 Feb 2008 04:27:55 GMT" }, { "version": "v3", "created": "Mon, 3 Mar 2008 05:41:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Shima", "Kazunari", "" ], [ "Tsuda", "Motomu", "" ] ]
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802.0339
Ben Morris
Ben Morris
Improved mixing time bounds for the Thorp shuffle and L-reversal chain
20 pages
null
null
null
math.PR
null
We prove a theorem that reduces bounding the mixing time of a card shuffle to verifying a condition that involves only pairs of cards, then we use it to obtain improved bounds for two previously studied models. E. Thorp introduced the following card shuffling model in 1973. Suppose the number of cards n is even. Cut the deck into two equal piles. Drop the first card from the left pile or from the right pile according to the outcome of a fair coin flip. Then drop from the other pile. Continue this way until both piles are empty. We obtain a mixing time bound of O(log^4 n). Previously, the best known bound was O(log^{29} n) and previous proofs were only valid for n a power of 2. We also analyze the following model, called the L-reversal chain, introduced by Durrett. There are n cards arrayed in a circle. Each step, an interval of cards of length at most L is chosen uniformly at random and its order is reversed. Durrett has conjectured that the mixing time is O(max(n, n^3/L^3) log n). We obtain a bound that is within a factor O(log^2 n) of this,the first bound within a poly log factor of the conjecture.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 06:44:31 GMT" } ]
2008-02-05T00:00:00
[ [ "Morris", "Ben", "" ] ]
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802.034
Redouane Mecheri
R. Mecheri, E. Marsch (Max Planck Institute for Solar System Research)
Drift instabilities in the solar corona within the multi-fluid description
9 pages, 7 figures, accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20079221
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent observations revealed that the solar atmosphere is highly structured in density, temperature and magnetic field. The presence of these gradients may lead to the appearance of currents in the plasma, which in the weakly collisional corona can constitute sources of free energy for driving micro-instabilities. Such instabilities are very important since they represent a possible source of ion-cyclotron waves which have been conjectured to play a prominent role in coronal heating, but whose solar origin remains unclear. Considering a density stratification transverse to the magnetic field, this paper aims at studying the possible occurrence of gradient-induced plasma micro-instabilities under typical conditions of coronal holes. Taking into account the WKB (Wentzel-Kramers-Brillouin) approximation, we perform a Fourier plane waves analysis using the collisionless multi-fluid model. By neglecting the electron inertia, this model allows us to take into account ion-cyclotron wave effects that are absent from the one-fluid model of magnetohydrodynamics (MHD). Realistic models of density and temperature, as well as a 2-D analytical magnetic-field model, are used to define the background plasma in the open-field funnel in a polar coronal hole. The ray-tracing theory is used to compute the ray path of the unstable waves, as well as the evolution of their growth rates during the propagation. We demonstrate that in typical coronal hole conditions, and when assuming typical transverse density length scales taken from radio observations, the current generated by a relative electron-ion drift provides enough free energy for driving the mode unstable. This instability results from a coupling between oppositely propagating slow-mode waves.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:00:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Mecheri", "R.", "", "Max Planck Institute for Solar System Research" ], [ "Marsch", "E.", "", "Max Planck Institute for Solar System Research" ] ]
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802.0341
Christian Schunck H.
Christian H. Schunck, Yong-il Shin, Andre Schirotzek, and Wolfgang Ketterle
Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
8 pages, 7 figures; Figures updated; New Figures added; Updated discussion of fit functions
Nature 454, 739-743 (2008)
10.1038/nature07176
null
cond-mat.supr-con cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fermionic superfluidity requires the formation of pairs. The actual size of these fermion pairs varies by orders of magnitude from the femtometer scale in neutron stars and nuclei to the micrometer range in conventional superconductors. Many properties of the superfluid depend on the pair size relative to the interparticle spacing. This is expressed in BCS-BEC crossover theories, describing the crossover from a Bardeen-Cooper-Schrieffer (BCS) type superfluid of loosely bound and large Cooper pairs to Bose-Einstein condensation (BEC) of tightly bound molecules. Such a crossover superfluid has been realized in ultracold atomic gases where high temperature superfluidity has been observed. The microscopic properties of the fermion pairs can be probed with radio-frequency (rf) spectroscopy. Previous work was difficult to interpret due to strong and not well understood final state interactions. Here we realize a new superfluid spin mixture where such interactions have negligible influence and present fermion-pair dissociation spectra that reveal the underlying pairing correlations. This allows us to determine the spectroscopic pair size in the resonantly interacting gas to be 2.6(2)/kF (kF is the Fermi wave number). The pairs are therefore smaller than the interparticle spacing and the smallest pairs observed in fermionic superfluids. This finding highlights the importance of small fermion pairs for superfluidity at high critical temperatures. We have also identified transitions from fermion pairs into bound molecular states and into many-body bound states in the case of strong final state interactions.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 07:51:01 GMT" }, { "version": "v2", "created": "Fri, 13 Jun 2008 17:55:27 GMT" } ]
2008-08-14T00:00:00
[ [ "Schunck", "Christian H.", "" ], [ "Shin", "Yong-il", "" ], [ "Schirotzek", "Andre", "" ], [ "Ketterle", "Wolfgang", "" ] ]
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802.0342
Bobak Nazer
Bobak Nazer and Michael Gastpar
The Case for Structured Random Codes in Network Capacity Theorems
23 pages, 7 figures, To appear in European Transactions on Telecommunication: Special Issue on New Directions in Information Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Random coding arguments are the backbone of most channel capacity achievability proofs. In this paper, we show that in their standard form, such arguments are insufficient for proving some network capacity theorems: structured coding arguments, such as random linear or lattice codes, attain higher rates. Historically, structured codes have been studied as a stepping stone to practical constructions. However, K\"{o}rner and Marton demonstrated their usefulness for capacity theorems through the derivation of the optimal rate region of a distributed functional source coding problem. Here, we use multicasting over finite field and Gaussian multiple-access networks as canonical examples to demonstrate that even if we want to send bits over a network, structured codes succeed where simple random codes fail. Beyond network coding, we also consider distributed computation over noisy channels and a special relay-type problem.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 07:14:40 GMT" } ]
2008-02-05T00:00:00
[ [ "Nazer", "Bobak", "" ], [ "Gastpar", "Michael", "" ] ]
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802.0343
D.N. Triantafyllopoulos
E. Iancu, M.S. Kugeratski, D.N. Triantafyllopoulos
Geometric Scaling in Mueller-Navelet Jets
24 pages
Nucl.Phys.A808:95-116,2008
10.1016/j.nuclphysa.2008.05.003
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We argue that the production of Mueller-Navelet jets at the LHC represents a convenient environment to study gluon saturation and high energy scattering in the presence of unitarity corrections. We show that, in a suitable range of transverse momenta for the produced jets, the cross section for the partonic subprocess should exhibit geometric scaling. We point out that, in the presence of a running coupling, the cross section for producing hard jets cannot be fully computed in perturbation theory, not even after taking into account the saturation effects: the non-perturbative physics affects the overall normalization of the cross section, but not also its geometric scaling behavior.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 07:17:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Iancu", "E.", "" ], [ "Kugeratski", "M. S.", "" ], [ "Triantafyllopoulos", "D. N.", "" ] ]
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802.0344
Toshihiko Masuda
Toshihiko Masuda, Reiji Tomatsu
Approximate innerness and central triviality of endomorphisms
57 pages
null
null
null
math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce the notions of approximate innerness and central triviality for endomorphisms on separable von Neumann factors, and we characterize them for hyperfinite factors by Connes-Takesaki modules of endomorphisms and modular endomorphisms which are introduced by Izumi. Our result is a generalization of the corresponding result obtained by Kawahigashi-Sutherland-Takesaki in automorphism case.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 07:28:59 GMT" } ]
2008-02-05T00:00:00
[ [ "Masuda", "Toshihiko", "" ], [ "Tomatsu", "Reiji", "" ] ]
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802.0345
A. M. Kamchatnov
E.G. Khamis, A. Gammal, G.A. El, Yu.G. Gladush, A.M. Kamchatnov
Nonlinear diffraction of light beams propagating in photorefractive media with embedded reflecting wire
18 pages
null
10.1103/PhysRevA.78.013829
null
nlin.PS
null
The theory of nonlinear diffraction of intensive light beams propagating through photorefractive media is developed. Diffraction occurs on a reflecting wire embedded in the nonlinear medium at relatively small angle with respect to the direction of the beam propagation. It is shown that this process is analogous to the generation of waves by a flow of a superfluid past an obstacle. The ``equation of state'' of such a superfluid is determined by the nonlinear properties of the medium. On the basis of this hydrodynamic analogy, the notion of the ``Mach number'' is introduced where the transverse component of the wave vector plays the role of the fluid velocity. It is found that the Mach cone separates two regions of the diffraction pattern: inside the Mach cone oblique dark solitons are generated and outside the Mach cone the region of ``ship waves'' is situated. Analytical theory of ``ship waves'' is developed and two-dimensional dark soliton solutions of the equation describing the beam propagation are found. Stability of dark solitons with respect to their decay into vortices is studied and it is shown that they are stable for large enough values of the Mach number.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:27:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Khamis", "E. G.", "" ], [ "Gammal", "A.", "" ], [ "El", "G. A.", "" ], [ "Gladush", "Yu. G.", "" ], [ "Kamchatnov", "A. M.", "" ] ]
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802.0346
Marco Genovese
G.Brida, M.Chekhova, M.Genovese, M.L.Rastello and I.Ruo-Berchera
Absolute calibration of Analog Detectors using Stimulated Parametric Down Conversion
null
Journal of Modern Optics 56 (2009) 401.
10.1080/09500340802318317
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spontaneous parametric down conversion has been largely exploited as a tool for absolute calibration of photon counting detectors, photomultiplier tubes or avalanche photodiodes working in Geiger regime. In this work we investigate the extension of this technique from very low photon flux of photon counting regime to the absolute calibration of analog photodetectors at higher photon flux. Moving toward higher photon rate, i.e. at high gain regime, with the spontaneous parametric down conversion shows intrinsic limitations of the method, while the stimulated parametric down conversion process, where a seed beam properly injected into the crystal in order to increase the photon generation rate in the conjugate arm, allows us to work around this problem. A preliminary uncertainty budget is discussed.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:48:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Brida", "G.", "" ], [ "Chekhova", "M.", "" ], [ "Genovese", "M.", "" ], [ "Rastello", "M. L.", "" ], [ "Ruo-Berchera", "I.", "" ] ]
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802.0347
Dr. Peter S"ule
P. S\"ule
Self-organized transient facilitated atomic transport in Pt/Al(111)
12 pages, 8 figures, full paper at: http://www.mfa.kfki.hu/~sule/papers/ptonal.pdf . J. Chem. Phys. (2008), in press
null
10.1063/1.2841452
null
cond-mat.mtrl-sci cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
During the course of atomic transport in a host material, impurity atoms need to surmount an energy barrier driven by thermodynamic bias or at ultra-low temperatures by quantum tunneling. In the present article we demonstrate using atomistic simulations that at ultra-low temperature transient inter-layer atomic transport is also possible without tunneling when the Pt/Al(111) impurity/host system self-organizes itself spontaneously into an intermixed configuration. No such extremely fast athermal concerted process has been reported before at ultra low temperatures. The outlined novel transient atomic exchange mechanism could be of general validity. We find that the source of ultra-low temperature heavy particle barrier crossing is intrinsic and no external bias is necessary for atomic intermixing and surface alloying in Pt/Al although the dynamic barrier height is few eV. The mechanism is driven by the local thermalization of the Al(111) surface in a self-organized manner arranged spontaneously by the system without any external stimulus. The core of the short lived thermalized region reaches the local temperature of $\sim 1000$ K (including few tens of Al atoms) while the average temperature of the simulation cell is $\sim 3$ K. The transient facilitated intermixing process also takes place with repulsive impurity-host interaction potential leading to negative atomic mobility hence the atomic injection is largely independent of the strength of the impurity-surface interaction. We predict that similar exotic behaviour is possible in other materials as well.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:12:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Süle", "P.", "" ] ]
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802.0348
Zhongshui Ma
Zhongshui Ma
Thermospin Hall effect generated by thermal influence and thermoelectric effect
16 pages
null
null
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we present the theoretical predication of a thermospin Hall effect, in which a transverse spin current can be generated in semiconductors in the presence of spin-orbit coupling by a frequency-dependent longitudinal temperature gradient. Because of the thermoelectric effect, there is no net charge current but there is a heat flow from the hot side to the cold side. We perform the theoretical calculation of dynamical thermospin Hall conductivity in a two-dimensional Rashba spintronic system. It has been shown that the direct interband optical transition dominates the ordering and manipulation of spin in the generation of a transverse intrinsic spin current. In view of the role of the thermoelectric effect, the contributions to the thermospin Hall effect are classified as that originating from a direct contribution of thermal electronic diffusion and that from the compensatory electron flow in balance with the thermal diffusion. For a finite system, the analysis yields evidence that the spin accumulation around the edges of a plate determines the magnetization. In equilibrium, a field created by a magnetization gradient emerges in the direction perpendicular to the temperature gradient. The experimental observation of the thermospin Hall effect is proposed by measuring the longitudinal temperature difference with the injection of a transverse spin current and by analyzing the Hall angle. In addition, in order to achieve pure spin accumulation in the spin Hall effect, an extension of the thermospin Hall effect for exciting electron-hole pairs in semiconductors is proposed.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:15:20 GMT" } ]
2008-02-05T00:00:00
[ [ "Ma", "Zhongshui", "" ] ]
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802.0349
Elijah Liflyand
E. Ostrovsky, E. Rogover
Exact exponential bounds for the random field maximum distribution via the majoring measures (generic chaining)
18 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper non-asymptotic exact exponential estimates are derived for the tail of maximum distribution of random field in the terms of majoring measures or, equally, generic chaining.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:39:00 GMT" } ]
2008-02-05T00:00:00
[ [ "Ostrovsky", "E.", "" ], [ "Rogover", "E.", "" ] ]
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802.035
Paolo Esposito
A. Pellizzoni (1), A. Tiengo (1), A. De Luca (1,2,3), P. Esposito (1,3,4), S. Mereghetti (1) ((1) INAF-IASF Milano, Italy, (2) IUSS Pavia, Italy, (3) Universit\`a di Pavia, DFNT, Italy, (4) INFN-Pavia, Italy)
PSR J0737-3039: Interacting Pulsars in X-Rays
Revised to match the final version. Typos corrected
The Astrophysical Journal, Volume 679, Issue 1, pp. 664-674 (2008)
10.1086/587053
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the results of a ~230 ks long X-ray observation of the relativistic double-pulsar system PSR J0737-3039 obtained with the XMM-Newton satellite in 2006 October. We confirm the detection in X-rays of pulsed emission from PSR J0737-3039A (PSR A), mostly ascribed to a soft non-thermal power-law component (photon index ~ 3.3) with a 0.2-3 keV luminosity of ~1.9E+30 erg/s (assuming a distance of 500 pc). For the first time, pulsed X-ray emission from PSR J0737-3039B (PSR B) is also detected in part of the orbit. This emission, consistent with thermal radiation with temperature kT=30 eV and a bolometric luminosity of ~1E+32 erg/s, is likely powered by heating of PSR B's surface caused by PSR A's wind. A hotter (~130 eV) and fainter (~5E+29 erg/s) thermal component, probably originating from back-falling particles heating polar caps of either PSR A or PSR B is also required by the data. No signs of X-ray emission from a bow-shock between PSR A's wind and the interstellar medium or PSR B's magnetosphere are present. The upper limit on the luminosity of such a shock component (~1E+29 erg/s) constrains the wind magnetization parameter sigma of PSR A to values greater than 1.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:39:46 GMT" }, { "version": "v2", "created": "Fri, 28 Mar 2008 23:53:58 GMT" } ]
2009-02-23T00:00:00
[ [ "Pellizzoni", "A.", "" ], [ "Tiengo", "A.", "" ], [ "De Luca", "A.", "" ], [ "Esposito", "P.", "" ], [ "Mereghetti", "S.", "" ] ]
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802.0351
Sunil Srinivasa
Sunil Srinivasa and Martin Haenggi
Path Loss Exponent Estimation in a Large Field of Interferers
Work underway
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In wireless channels, the path loss exponent (PLE) has a strong impact on the quality of links, and hence, it needs to be accurately estimated for the efficient design and operation of wireless networks. In this paper, we address the problem of PLE estimation in large wireless networks, which is relevant to several important issues in networked communications such as localization, energy-efficient routing, and channel access. We consider a large ad hoc network where nodes are distributed as a homogeneous Poisson point process on the plane and the channels are subject to Nakagami-m fading. We propose and discuss three distributed algorithms for estimating the PLE under these settings which explicitly take into account the interference in the network. In addition, we provide simulation results to demonstrate the performance of the algorithms and quantify the estimation errors. We also describe how to estimate the PLE accurately even in networks with spatially varying PLEs and more general node distributions.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 17:04:15 GMT" }, { "version": "v2", "created": "Sat, 7 Nov 2009 06:16:41 GMT" }, { "version": "v3", "created": "Mon, 23 Jan 2012 01:46:49 GMT" } ]
2012-01-24T00:00:00
[ [ "Srinivasa", "Sunil", "" ], [ "Haenggi", "Martin", "" ] ]
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802.0352
Sergei Zvyagin
S. A. Zvyagin, J. Wosnitza, A. K. Kolezhuk, V. S. Zapf, M. Jaime, A. Paduan-Filho, V. N. Glazkov, S. S. Sosin, A. I. Smirnov
Spin Dynamics of $Ni Cl_2-4SC(NH_2)_2$ in the Field-Induced Ordered Phase
4 pages, 3 figures
null
10.1103/PhysRevB.77.092413
null
cond-mat.str-el cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
$Ni Cl_2$-$4SC(NH_2)_2$ (known as DTN) is a spin-1 material with a strong single-ion anisotropy that is regarded as a new candidate for Bose-Einstein condensation (BEC) of spin degrees of freedom. We present a systematic study of the low-energy excitation spectrum of DTN in the field-induced magnetically ordered phase by means of high-field electron spin resonance measurements at temperatures down to 0.45 K. We argue that two gapped modes observed in the experiment can be consistently interpreted within a four-sublattice antiferromagnet model with a finite interaction between two tetragonal subsystems and unbroken axial symmetry. The latter is crucial for the interpretation of the field-induced ordering in DTN in terms of BEC.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:41:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Zvyagin", "S. A.", "" ], [ "Wosnitza", "J.", "" ], [ "Kolezhuk", "A. K.", "" ], [ "Zapf", "V. S.", "" ], [ "Jaime", "M.", "" ], [ "Paduan-Filho", "A.", "" ], [ "Glazkov", "V. N.", "" ], [ "Sosin", "S. S.", "" ], [ "Smirnov", "A. I.", "" ] ]
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802.0353
Tsuyoshi Yamamoto
T. Yamamoto, M. Watanabe, J. Q. You, Yu. A. Pashkin, O. Astafiev, Y. Nakamura, F. Nori, and J. S. Tsai
Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
Accepted for publication in PRB. 11 pages, 7 figures
Phys. Rev. B 77, 064505 (2008)
10.1103/PhysRevB.77.064505
null
cond-mat.mes-hall cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have designed and experimentally implemented a circuit of inductively-coupled superconducting charge qubits, where a Josephson junction is used as an inductance, and the coupling between the qubits is controlled by an applied magnetic flux. Spectroscopic measurements on the circuit are in good agreement with theoretical calculations. We observed anticrossings which originate from the coupling between the qubit and the plasma mode of the Josephson junction. Moreover, the size of the anticrossing depends on the external magnetic flux, which demonstrates the controllability of the coupling.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:42:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Yamamoto", "T.", "" ], [ "Watanabe", "M.", "" ], [ "You", "J. Q.", "" ], [ "Pashkin", "Yu. A.", "" ], [ "Astafiev", "O.", "" ], [ "Nakamura", "Y.", "" ], [ "Nori", "F.", "" ], [ "Tsai", "J. S.", "" ] ]
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802.0354
M. B. Paranjape
Garnik Alexanian, R. MacKenzie, M. B. Paranjape, Jonathan Ruel
Path integration and perturbation theory with complex Euclidean actions
11 pages, no figures, version to be published in PRD
Phys.Rev.D77:105014,2008
10.1103/PhysRevD.77.105014
UdeM-GPP-TH-08-165
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Euclidean path integral quite often involves an action that is not completely real {\it i.e.} a complex action. This occurs when the Minkowski action contains $t$-odd CP-violating terms. Analytic continuation to Euclidean time yields an imaginary term in the Euclidean action. In the presence of imaginary terms in the Euclidean action, the usual method of perturbative quantization can fail. Here the action is expanded about its critical points, the quadratic part serving to define the Gaussian free theory and the higher order terms defining the perturbative interactions. For a complex action, the critical points are generically obtained at complex field configurations. Hence the contour of path integration does not pass through the critical points and the perturbative paradigm cannot be directly implemented. The contour of path integration has to be deformed to pass through the complex critical point using a generalized method of steepest descent, in order to do so. Typically, what is done is that only the real part of the Euclidean action is considered, and its critical points are used to define the perturbation theory. In this article we present a simple 0+1-dimensional example, of $N$ scalar fields interacting with a U(1) gauge field, in the presence of a Chern-Simons term, where alternatively, the path integral can be done exactly, the procedure of deformation of the contour of path integration can be done explicitly and the standard method of only taking into account the real part of the action can be followed. We show explicitly that the standard method does not give a correct perturbative expansion.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:47:20 GMT" }, { "version": "v2", "created": "Fri, 4 Apr 2008 04:44:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Alexanian", "Garnik", "" ], [ "MacKenzie", "R.", "" ], [ "Paranjape", "M. B.", "" ], [ "Ruel", "Jonathan", "" ] ]
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802.0355
Seoktae Koh
Seoktae Koh
Trans-Planckian Physics and Non-Commutative Inflation
11pages, 1 figure, To appear in the Proceedings of the CospA 2007, Taiwan
Mod.Phys.Lett.A23:1598-1605,2008
10.1142/S0217732308027990
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Non-commutativity of spacetime at the Planck scale may deform the usual dispersion relations. And these deformed dispersion relations could lead to the accelerating phase without a scalar field. In this paper, we have calculated the spectral index and the running of spectral index in a non-commutative inflation model. Non-commutative inflation with thermal radiation gives a scale invariant spectrum in the limit $w \to -1$ and negative running spectral index which are consistent with the WMAP 3-year results.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 08:50:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Koh", "Seoktae", "" ] ]
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802.0356
Hu Chen
Hu Chen, Jie Yan
Effects of kink and flexible hinge defects on mechanical responses of short double stranded DNA molecules
9 pages with 9 figures. Theoretical calculation based on transfer matrix. Minor updates, a new figure and more discussions are added
PHYSICAL REVIEW E 77, 041907 (2008)
10.1103/PhysRevE.77.041907
null
q-bio.BM q-bio.QM
null
We predict various detectable mechanical responses to the presence of local DNA defects which are defined as short DNA segments exhibiting mechanical properties obviously different from the 50 nm persistence length based semiflexible polymer model. The defects discussed are kinks and flexible hinges either permanently fixed on DNA or thermally excited. Their effects on extension shift, the effective persistence length, the end-to-end distance distribution, and the cyclization probability are computed using a transfer-matrix method. Our predictions will be useful in future experimental designs to study DNA nicks or mismatch base pairs, mechanics of specific DNA sequences, and specific DNA-protein interaction using magnetic tweezer, fluorescence resonance energy transfer or plasmon resonance technique, and the traditional biochemistry cyclization probability measurements.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:09:18 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 10:46:14 GMT" } ]
2009-05-04T00:00:00
[ [ "Chen", "Hu", "" ], [ "Yan", "Jie", "" ] ]
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802.0357
Mohamed Boucetta
Mohamed Boucetta-Alberto Medina
Polynomial Poisson structures on affine solvmanifolds
17 pages
null
null
null
math.SG math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A $n$-dimensional Lie group $G$ equipped with a left invariant symplectic form $\om^+$ is called a symplectic Lie group. It is well-known that $\om^+$ induces a left invariant affine structure on $G$. Relatively to this affine structure we show that the left invariant Poisson tensor $\pi^+$ corresponding to $\om^+$ is polynomial of degree 1 and any right invariant $k$-multivector field on $G$ is polynomial of degree at most $k$. If $G$ is unimodular, the symplectic form $\om^+$ is also polynomial and the volume form $\wedge^{\frac{n}2}\om^+$ is parallel. We show also that any left invariant tensor field on a nilpotent symplectic Lie group is polynomial, in particular, any left invariant Poisson structure on a nilpotent symplectic Lie group is polynomial. Because many symplectic Lie groups admit uniform lattices, we get a large class of polynomial Poisson structures on compact affine solvmanifolds.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:00:45 GMT" } ]
2008-02-05T00:00:00
[ [ "Medina", "Mohamed Boucetta-Alberto", "" ] ]
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802.0358
Qing-Yu Cai
Yong-gang Tan and Qing-yu Cai
Classical Correlation in Quantum Dialogue
Here we point out the erroneous use of classical communication results in the insecurity of quantum dialogue protocols. Int. J. Quant. Inf. (In press)
Int. J. Quant. Inf. 6, 325-329 (2008)
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Classical communications are used in the post-processing procedure of quantum key distribution. Since the security of quantum key distribution is based on the principles of quantum mechanics, intuitively the secret key can only be derived from the quantum states. We find that classical communications are incorrectly used in the so-called quantum dialogue type protocols. In these protocols, public communications are used to transmit secret messages. Our calculations show that half of Alice's and Bob's secret message is leaked through classical channel. By applying Holevo bound, we can see that the quantum efficiency claimed in the quantum dialogue type of protocols is not achievable.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:10:42 GMT" } ]
2008-05-05T00:00:00
[ [ "Tan", "Yong-gang", "" ], [ "Cai", "Qing-yu", "" ] ]
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802.0359
Yng-Ing Lee
Yng-Ing Lee and Mu-Tao Wang
Hamiltonian stationary cones and self-similar solutions in higher dimension
18 pages
null
null
null
math.DG math.AP
null
In [LW], we construct examples of two-dimensional Hamiltonian stationary self-shrinkers and self-expanders for Lagrangian mean curvature flows, which are asymptotic to the union of two Schoen-Wolfson cones. These self-shrinkers and self-expanders can be glued together to yield solutions of the Brakke flow - a weak formulation of the mean curvature flow. Moreover, there is no mass loss along the Brakke flow. In this paper, we generalize these results to higher dimension. We construct new higher dimensional Hamiltonian stationary cones of different topology as generalizations of the Schoen-Wolfson cones. Hamiltonian stationary self-shrinkers and self-expanders that are asymptotic to these Hamiltonian stationary cones are also constructed. They can also be glued together to produce eternal solutions of the Brakke flow without mass loss. Finally, we show the same conclusion holds for those Lagrangian self-similar examples recently found by Joyce, Tsui and the first author in [JLT].
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:40:16 GMT" } ]
2008-02-05T00:00:00
[ [ "Lee", "Yng-Ing", "" ], [ "Wang", "Mu-Tao", "" ] ]
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802.036
Anne Decourchelle
Anne Decourchelle (SAp/AIM, CEA Saclay)
Supernova remnants, planetary nebulae and superbubbles: prospects for new XMM-Newton observations
4 pages, 1 figure, invited review for "XMM-Newton: The next decade", AN in press
Astron.Nachr.329:178-181,2008
10.1002/asna.200710907
null
astro-ph
null
Important results achieved over the last years on supernova remnants, planetary nebulae and superbubbles are briefly reviewed in the context of X-ray observations. I intend to review the important open scientific questions in these fields, and the specific contributions that can be made by XMM-Newton.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:53:46 GMT" } ]
2009-06-23T00:00:00
[ [ "Decourchelle", "Anne", "", "SAp/AIM, CEA Saclay" ] ]
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802.0361
Anton Deitmar
Anton Deitmar, Nikolaos Diamantis
Automorphic forms of higher order
LaTeX, 24 pages
Journal of the London Mathematical Society. 80, 18-34 (2009)
10.1112/jlms/jdp015
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper a theory of Hecke operators for higher order modular forms is established. The definition of cusp forms and attached L-functions is extended beyond the realm of parabolic invariants. The role of representation theoretic methods is clarified and, motivated by higher order forms, new convolution products of L-functions are introduced.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:38:42 GMT" }, { "version": "v2", "created": "Fri, 5 Sep 2008 07:15:27 GMT" }, { "version": "v3", "created": "Sun, 12 Oct 2008 09:35:49 GMT" }, { "version": "v4", "created": "Fri, 1 Sep 2017 08:29:44 GMT" } ]
2017-09-04T00:00:00
[ [ "Deitmar", "Anton", "" ], [ "Diamantis", "Nikolaos", "" ] ]
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802.0362
Jan-Joris van Es
J. J. P. van Es, S. Whitlock, T. Fernholz, A. H. van Amerongen, N. J. van Druten
Three-dimensional character of atom-chip-based rf-dressed potentials
9 pages, 7 figures
Phys. Rev. A 77, 063623 (2008)
10.1103/PhysRevA.77.063623
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally investigate the properties of radio-frequency-dressed potentials for Bose-Einstein condensates on atom chips. The three-dimensional potential forms a connected pair of parallel waveguides. We show that rf-dressed potentials are robust against the effect of small magnetic-field variations on the trap potential. Long-lived dipole oscillations of condensates induced in the rf-dressed potentials can be tuned to a remarkably low damping rate. We study a beam-splitter for Bose-Einstein condensates and show that a propagating condensate can be dynamically split in two vertically separated parts and guided along two paths. The effect of gravity on the potential can be tuned and compensated for using a rf-field gradient.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:42:28 GMT" } ]
2010-10-08T00:00:00
[ [ "van Es", "J. J. P.", "" ], [ "Whitlock", "S.", "" ], [ "Fernholz", "T.", "" ], [ "van Amerongen", "A. H.", "" ], [ "van Druten", "N. J.", "" ] ]
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802.0363
Stefan Schramm
A. Mishra, S. Schramm, W. Greiner
Kaons and antikaons in asymmetric nuclear matter
null
Phys.Rev.C78:024901,2008
10.1103/PhysRevC.78.024901
null
nucl-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The properties of kaons and antikaons and their modification in isospin asymmetric nuclear matter are investigated using a chiral SU(3) model. These isospin dependent medium effects are important for asymmetric heavy ion collision experiments. In the present work, the medium modifications of the energies of the kaons and antikaons, within the asymmetric nuclear matter, arise due to the interactions of kaons and antikaons with the nucleons and scalar mesons. The values of the parameters in the model are obtained by fitting the saturation properties of nuclear matter and kaon-nucleon scattering lengths. The pion-nucleon scattering lengths are also calculated within the chiral effective model and compared with earlier results from the literature. The density dependence of the isospin asymmetry is seen to be appreciable for the kaon and antikaon optical potentials. This can be particularly relevant for the future accelerator facility FAIR at GSI, where experiments using neutron rich beams are planned to be used in the study of compressed baryonic matter.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:45:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Mishra", "A.", "" ], [ "Schramm", "S.", "" ], [ "Greiner", "W.", "" ] ]
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802.0364
Christian Kramberger
C. Kramberger, R. Hambach, C. Giorgetti, M. H. Rummeli, M. Knupfer, J. Fink, B. Buchner, L. Reining, E. Einarsson, S. Maruyama, F. Sottile, K. Hannewald, V. Olevano, A.G. Marinopoulos, T. Pichler
Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene
null
Phys. Rev. Lett. 100, 196803 (2008)
10.1103/PhysRevLett.100.196803
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have measured a strictly linear pi-plasmon dispersion along the axis of individualized single wall carbon nanotubes, which is completely different from plasmon dispersions of graphite or bundled single wall carbon nanotubes. Comparative ab initio studies on graphene based systems allow us to reproduce the different dispersions. This suggests that individualized nanotubes provide viable experimental access to collective electronic excitations of graphene, and it validates the use of graphene to understand electronic excitations of carbon nanotubes. In particular, the calculations reveal that local field effects (LFE) cause a mixing of electronic transitions, including the 'Dirac cone', resulting in the observed linear dispersion.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:50:33 GMT" } ]
2010-09-08T00:00:00
[ [ "Kramberger", "C.", "" ], [ "Hambach", "R.", "" ], [ "Giorgetti", "C.", "" ], [ "Rummeli", "M. H.", "" ], [ "Knupfer", "M.", "" ], [ "Fink", "J.", "" ], [ "Buchner", "B.", "" ], [ "Reining", "L.", "" ], [ "Einarsson", "E.", "" ], [ "Maruyama", "S.", "" ], [ "Sottile", "F.", "" ], [ "Hannewald", "K.", "" ], [ "Olevano", "V.", "" ], [ "Marinopoulos", "A. G.", "" ], [ "Pichler", "T.", "" ] ]
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802.0365
Marco Koschorreck
M. Koschorreck and M. W. Mitchell
Non-ideal atom-light interfaces: modeling real-world effects
null
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a model which describes coherent and incoherent processes in continuous-variable atom-light interfaces. We assume Gaussian states for light and atoms and formulate the system dynamics in terms of first and second moments of the angular momentum operators. Spatial and temporal inhomogeneities in light and atom variables are incorporated by partitioning the system into small homogeneous segments. Furthermore, other experimental imperfections as for instance limited detector time-resolution and atomic motion are simulated. The model is capable of describing many experimental situations ranging from room temperature vapor cells to sub-mK atomic clouds. To illustrate the method, we calculate the effect of detector time-resolution, spatial inhomogeneities and atomic motion on the spin squeezing dynamics of rubidium 87 on the D2 transition.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 09:56:34 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 15:07:10 GMT" } ]
2008-02-22T00:00:00
[ [ "Koschorreck", "M.", "" ], [ "Mitchell", "M. W.", "" ] ]
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802.0366
Ming-Hao Liu
Ming-Hao Liu, Son-Hsien Chen, Ching-Ray Chang
Current-induced spin polarization in spin-orbit-coupled two-dimensional electron systems
7 pages, 6 figures, 1 table, Phys. Rev. B, in press
Phys. Rev. B 78, 165316 (2008)
10.1103/PhysRevB.78.165316
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Current-induced spin polarization (CISP) is rederived in ballistic spin-orbit-coupled electron systems, based on equilibrium statistical mechanics. A simple and useful picture is correspondingly proposed to help understand the CISP and predict the polarization direction. Nonequilibrium Landauer-Keldysh formalism is applied to demonstrate the validity of the statistical picture, taking the linear Rashba-Dresselhaus [001] two-dimensional system as a specific example. Spin densities induced by the CISP in semiconductor heterostructures and in metallic surface states are compared, showing that the CISP increases with the spin splitting strength and hence suggesting that the CISP should be more observable on metal and semimetal surfaces due to the discovered strong Rashba splitting. An application of the CISP designed to generate a spin-Hall pattern in the inplane, instead of the out-of-plane, component is also proposed.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:02:41 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 08:43:42 GMT" }, { "version": "v3", "created": "Sun, 19 Oct 2008 07:30:37 GMT" } ]
2008-10-24T00:00:00
[ [ "Liu", "Ming-Hao", "" ], [ "Chen", "Son-Hsien", "" ], [ "Chang", "Ching-Ray", "" ] ]
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802.0367
Faruk Gungor
P. Basarab-Horwath, F. Gungor, V. Lahno
Symmetry classification of third-order nonlinear evolution equations
The authors withdraw this article due to substantial revisions to the content
null
null
null
nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a Lie-algebraic classification of third order quasilinear equations which admit non-trivial Lie point symmetries.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:05:10 GMT" }, { "version": "v2", "created": "Tue, 5 Oct 2010 13:16:24 GMT" }, { "version": "v3", "created": "Wed, 6 Oct 2010 10:56:26 GMT" } ]
2010-10-07T00:00:00
[ [ "Basarab-Horwath", "P.", "" ], [ "Gungor", "F.", "" ], [ "Lahno", "V.", "" ] ]
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802.0368
Surajit Sen
Mihir Ranjan Nath, Surajit Sen, Asoke Kumar Sen and Gautam Gangopadhyay
Dynamical symmetry breaking of lambda and vee-type three-level systems on quantization of the field modes
27 pages, 9 Figures
Pramana - Journal of Physics, Vol. 71, (2008) 77-97
null
null
quant-ph
http://creativecommons.org/licenses/publicdomain/
We develop a scheme to construct the Hamiltonians of the lambda, vee and cascade type of three-level configurations using the generators of SU(3) group. It turns out that this approach provides a well defined selection rule to give different Hamitonians for each configurations. The lambda and vee type configurations are exactly solved with different initial conditions while taking the two-mode classical and quantized fields . For the classical field, it is shown that the Rabi oscillation of the lambda model is similar to that of the vee model and the dynamics of the vee model can be recovered from lambda model and vice versa simply by inversion. We then proceed to solve the quantized version of both models introducing a novel Euler matrix formalism. It is shown that this dynamical symmetry exhibited in the Rabi oscillation of two configurations for the semiclassical models is completely destroyed on quantization of the field modes. The symmetry can be restored within the quantized models when the field modes are both in the coherent states with large average photon number which is depicted through the collapse and revival of the Rabi oscillations.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:06:16 GMT" } ]
2008-09-12T00:00:00
[ [ "Nath", "Mihir Ranjan", "" ], [ "Sen", "Surajit", "" ], [ "Sen", "Asoke Kumar", "" ], [ "Gangopadhyay", "Gautam", "" ] ]
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802.0369
Alice Garbagnati
Alice Garbagnati
Symplectic Automorphisms on Kummer Surfaces
13 pages
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nikulin proved that the isometries induced on the second cohomology group of a K3 surface $X$ by a finite abelian group $G$ of symplectic automorphisms are essentially unique. Moreover he computed the discriminant of the sublattice of $H^2(X, \Z)$ which is fixed by the isometries induced by $G$. However for certain groups these discriminants are not the same of those found for explicit examples. Here we describe Kummer surfaces for which this phenomena happens and we explain the difference.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:18:25 GMT" } ]
2008-02-05T00:00:00
[ [ "Garbagnati", "Alice", "" ] ]
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802.037
Timo Anguita
T. Anguita (1), C. Faure (1), A. Yonehara (1,2), J. Wambsganss (1), J.-P. Kneib (3), G. Covone (4) and D. Alloin (5) ((1) ARI/Zentrum fuer Astronomie, University of Heidelberg, (2) JSPS Fellowships for Research Abroad, (3) Laboratoire d'Astrophysique de Marseille, (4) INAF, Naples, (5) AIM, CEA/DSM-CNRS-Universite Paris 7)
Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing
13 pages, 18 figures. Accepted for publication in A&A: January 7, 2008
null
10.1051/0004-6361:20077306
null
astro-ph
null
CONTEXT: Gravitationally lensed quasars constitute an independent tool to derive H0 through time-delays; they offer as well the opportunity to study the mass distribution and interstellar medium of their lensing galaxies and, through microlensing they also allow one to study details of the emitting source. AIMS: For such studies, one needs to have an excellent knowledge of the close environment of the lensed images in order to model the lensing potential: this means observational data over a large field-of-view and spectroscopy at high spatial resolution. METHODS: We present VIMOS integral field observations around four lensed quasars: HE 0230-2130, RX J0911.4+0551, H 1413+117 and B 1359+154. Using the low, medium and high resolution modes, we study the quasar images and the quasar environments, as well as provide a detailed report of the data reduction. RESULTS: Comparison between the quasar spectra of the different images reveals differences for HE 0230-2130, RX J0911.4+0551 and H 1413+117: flux ratios between the images of the same quasar are different when measured in the emission lines and in the continuum. We have also measured the redshifts of galaxies in the neighborhood of HE 0230-2130 and RX J0911.4+0551 which possibly contribute to the total lensing potential. CONCLUSIONS: A careful analysis reveals that microlensing is the most natural explanation for the (de)magnification of the continuum emitting region of the background sources. In HE 0230-2130, image D is likely to be affected by microlensing magnification; in RX J0911.4+0551, images A1 and A3 are likely to be modified by microlensing de-magnification and in H 1413+117, at least image D is affected by microlensing.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:31:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Anguita", "T.", "" ], [ "Faure", "C.", "" ], [ "Yonehara", "A.", "" ], [ "Wambsganss", "J.", "" ], [ "Kneib", "J. -P.", "" ], [ "Covone", "G.", "" ], [ "Alloin", "D.", "" ] ]
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802.0371
Frithjof Anders
Frithjof B. Anders
On steady-state currents through nano-devices: a scattering-states numerical renormalization group approach to open quantum systems
4 pages, 6 figures
Phys. Rev. Lett. 101, 066804 (2008)
10.1103/PhysRevLett.101.066804
null
cond-mat.mes-hall cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a numerical renormalization group (NRG) approach to steady-state currents through nano-devices. A discretization of the scattering-states continuum ensures the correct boundary condition for an open quantum system. We introduce two degenerate Wilson chains for current carrying left and right-moving electrons reflecting time-reversal symmetry in the absence of a finite bias $V$. We employ the time-dependent NRG to evolve the known steady-state density operator for a non-interacting junction into the density operator of the fully interacting nano-device at finite bias. We calculate the temperature dependent current as function of $V$ and applied external magnetic field using a recently developed algorithm for non-equilibrium spectral functions.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:22:18 GMT" }, { "version": "v2", "created": "Thu, 15 Jan 2009 12:57:33 GMT" } ]
2009-01-15T00:00:00
[ [ "Anders", "Frithjof B.", "" ] ]
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802.0372
Anne Decourchelle
Anne Decourchelle (SAp/AIM, CEA Saclay)
Non-thermal acceleration mechanisms in supernova remnant shells
6 pages, 3 figures, invited talk at 'Simbol-X: the hard X-ray universe in focus', Bologna (Italy), 14-16 May, 2007. To appear in Memorie della SAIt
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A review of the main issues in the field of particle acceleration in Supernova Remnants is provided in the context of future X-ray observations with Simbol-X. After a summary of the nonthermal acceleration mechanisms at work, I briefly review the observations of supernova remnants in hard X-rays and in gamma rays. Open issues are discussed in this framework.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:44:39 GMT" } ]
2008-02-05T00:00:00
[ [ "Decourchelle", "Anne", "", "SAp/AIM, CEA Saclay" ] ]
[ 0.0441032648, 0.1293631941, -0.0695686489, -0.0427856781, -0.0581176095, 0.0056326888, -0.0083547058, -0.0531826429, 0.0728745982, -0.0801572651, -0.0958245844, 0.0215365756, -0.1016698852, -0.0149366567, -0.058596734, 0.0403421484, -0.0419472121, 0.0073725041, 0.1075151861, 0.0283161644, -0.0432887562, 0.009899877, 0.0262798928, -0.0193565655, -0.0009994204, -0.0877274051, 0.0361737795, -0.0011708566, 0.0969744772, -0.0958245844, 0.0247227419, -0.0393599495, -0.0732099786, -0.0144934682, -0.0874878466, 0.0798218772, -0.0346884988, -0.0376351066, -0.0825049654, 0.0047792513, 0.0049649114, -0.0016424933, -0.0941476524, 0.1045446247, -0.0940518305, 0.0463311858, -0.0680354536, -0.1130730063, -0.0186019465, 0.0768513158, -0.0743119642, 0.0956329331, 0.0462593175, -0.0045097447, -0.0907937959, -0.0758451596, 0.0745036155, 0.0003612138, -0.064058736, -0.0579259619, -0.0312867276, -0.1132646576, -0.0198356882, 0.0584529974, -0.0274777003, 0.0297535341, 0.0421388596, 0.1135521308, 0.0083187716, 0.0487986691, 0.0554345213, -0.0523202233, -0.0044648265, -0.0431450196, -0.0319335423, 0.0077797584, -0.0088517964, 0.0116546648, 0.0141341258, 0.0468103103, -0.0120858755, -0.0430971049, -0.0305680428, -0.039767202, -0.0782407746, 0.0196679961, 0.0275016557, -0.001224758, -0.0514578, 0.0080672326, 0.0345687196, 0.1160435677, -0.0353113599, -0.0089296531, 0.0195721705, -0.0034646576, 0.0324126668, -0.0491580106, 0.0977410749, 0.0889731273, -0.0162183102, 0.0004083774, 0.0181587581, -0.0949621648, 0.13242957, -0.0496371351, -0.0771867037, -0.0411806144, 0.0077078901, -0.032029368, 0.0449656844, -0.0371080711, -0.0995617434, 0.0526556075, -0.1274466962, -0.0323887095, -0.1040655002, -0.0098459758, 0.0034496849, 0.1333878189, -0.0125530204, 0.1907867491, -0.0904104933, 0.0869608074, 0.0160865523, -0.1177684143, 0.0435762294, -0.0343531147, -0.1086650789, -0.0397911593, 0.123805359, -0.0783365965, 0.0113192787, -0.1448867768, -0.0286275949, -0.059267506, -0.0504995547, -0.1631892622, -0.0189732686, 0.0637233481, 0.012361371, 0.0099118557, 0.0017577822, 0.0141461045, -0.0104209231, 0.0172604024, 0.0712455809, -0.0471696518, 0.0734974593, 0.0222193263, 0.0090374565, 0.0250581279, 0.0382340103, -0.0190451369, -0.0258247256, -0.0703831539, -0.02194383, 0.0770429671, -0.0423065536, -0.0348322354, -0.012696757, -0.0059441188, -0.1195890829, 0.0074383835, -0.0624297149, 0.0255132951, -0.1109648719, -0.0767075792, -0.1165226921, -0.0323407985, -0.0796302259, -0.120930627, -0.0347124562, 0.0191888735, -0.0148168765, 0.069329083, 0.0291067176, -0.04127644, -0.0707185417, 0.0726829469, -0.0244352687, 0.0426179841, 0.0769471377, -0.0757972449, 0.064777419, 0.0550991371, -0.0892606005, 0.0875836685, -0.0348082818, -0.0320772789, -0.028459901, 0.0081870127, -0.0161344651, 0.0900271982, -0.141341269, -0.0441272222, 0.0369643345, -0.084948495, -0.0198476668, -0.0189493112, 0.1273508668, 0.0331792608, 0.0827445313, -0.0706706345, -0.0058063711, -0.0362456478, 0.0943872184, 0.0090194894, -0.0311190337, 0.0400067642, 0.0531347319, -0.0256330762, 0.089021042, -0.039599508, -0.0641545579, -0.0457083285, 0.0295379274, 0.0937643573, 0.0229380094, 0.0408691838, 0.0037371588, -0.0183623862, 0.0888773054, 0.0407973155, -0.012361371, 0.1274466962, 0.0592195913, 0.0369643345, 0.0185420569, 0.0030963318, -0.0066777756, 0.1376041025, -0.0946267769, -0.0156313851, -0.0705748051, -0.0061387625, 0.0948184282, 0.0140981916, -0.00708503, -0.0573031008, -0.0189013984, 0.0632921383, 0.0789115429, 0.0492059253, -0.028459901, 0.0675563291, -0.0005199232, -0.0698082075, -0.0146731399, -0.0162901785, 0.0935247913, -0.0017862301, 0.0563927665, -0.0122176344, 0.0610881709, -0.0035125699 ]
802.0373
Guangyan Jia
Guangyan Jia and Shige Peng
Jensen's Inequality for g-Convex Function under g-Expectation
21 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A real valued function defined on}$\mathbb{R}$ {\small is called}$g${\small --convex if it satisfies the following \textquotedblleft generalized Jensen's inequality\textquotedblright under a given}$g${\small -expectation, i.e., }$h(\mathbb{E}^{g}[X])\leq \mathbb{E}% ^{g}[h(X)]${\small, for all random variables}$X$ {\small such that both sides of the inequality are meaningful. In this paper we will give a necessary and sufficient conditions for a }$C^{2}${\small -function being}$% g ${\small -convex. We also studied some more general situations. We also studied}$g${\small -concave and}$g${\small -affine functions.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:58:27 GMT" } ]
2008-02-05T00:00:00
[ [ "Jia", "Guangyan", "" ], [ "Peng", "Shige", "" ] ]
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802.0374
Itskovsky Matvey A.
M. A. Itskovsky, H. Cohen and T. Maniv
Far-field interaction of focused relativistic electron beams in electron energy loss spectroscopy of nanoscopic platelets
11 pages, 6 figures
null
10.1103/PhysRevB.78.045419
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A quantum mechanical scattering theory for relativistic, highly focused electron beams near nanoscopic platelets is presented, revealing a new excitation mechanism due to the electron wave scattering from the platelet edges. Radiative electromagnetic excitations within the light cone are shown to arise, allowed by the breakdown of momentum conservation along the beam axis in the inelastic scattering process. Calculated for metallic (silver and gold) and insulating (SiO2 and MgO) nanoplatelets, new radiative features are revealed above the main surface plasmon-polariton peak, and dramatic enhancements in the electron energy loss probability at gaps of the 'classical' spectra, are found. The corresponding radiation should be detectable in the vacuum far-field zone, with e-beams exploited as sensitive 'tip-detectors' of electronically excited nanostructures.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:58:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Itskovsky", "M. A.", "" ], [ "Cohen", "H.", "" ], [ "Maniv", "T.", "" ] ]
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802.0375
Mladen Mitic Mr
M. Mitic, K. D. Petersson, M. C. Cassidy, R. P. Starrett, E. Gauja, A. J. Ferguson, C. Yang, D. N. Jamieson, R. G. Clark and A. S. Dzurak
Bias spectroscopy and simultaneous SET charge state detection of Si:P double dots
7 pages, 6 figures
null
10.1088/0957-4484/19/26/265201
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a detailed study of low-temperature (mK) transport properties of a silicon double-dot system fabricated by phosphorous ion implantation. The device under study consists of two phosphorous nanoscale islands doped to above the metal-insulator transition, separated from each other and the source and drain reservoirs by nominally undoped (intrinsic) silicon tunnel barriers. Metallic control gates, together with an Al-AlOx single-electron transistor, were positioned on the substrate surface, capacitively coupled to the buried dots. The individual double-dot charge states were probed using source-drain bias spectroscopy combined with non-invasive SET charge sensing. The system was measured in linear (VSD = 0) and non-linear (VSD <> 0) regimes allowing calculations of the relevant capacitances. Simultaneous detection using both SET sensing and source-drain current measurements was demonstrated, providing a valuable combination for the analysis of the system. Evolution of the triple points with applied bias was observed using both charge and current sensing. Coulomb diamonds, showing the interplay between the Coulomb charging effects of the two dots, were measured using simultaneous detection and compared with numerical simulations.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 10:59:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Mitic", "M.", "" ], [ "Petersson", "K. D.", "" ], [ "Cassidy", "M. C.", "" ], [ "Starrett", "R. P.", "" ], [ "Gauja", "E.", "" ], [ "Ferguson", "A. J.", "" ], [ "Yang", "C.", "" ], [ "Jamieson", "D. N.", "" ], [ "Clark", "R. G.", "" ], [ "Dzurak", "A. S.", "" ] ]
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802.0376
Tomaso Belloni
Tomaso M. Belloni (INAF - Osservatorio Astronomico di Brera)
Noise components from black-hole binaries in our galaxy
Proc. SPIE Conference Fluctuations and Noise, Florence May 2-24, 2007 - 14 pages, 10 figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Accreting binaries containing a black hole are stellar systems composed of a normal star and a black hole. Because of the strong gravitational pull of the black hole, matter is removed from the companion star and falls into the compact ob ject. In falling, it forms an accretion disk of gas that spirals towards the center, heating up and emitting in X rays. The physics of such a structure is extremely complex and can be studied through observations with X-ray satellites. The time series derived from X-ray observations of bright black-hole binaries in the Galaxy show a complex phenomenology. Broad noise components with a variability of up to 40% are observed, as well as quasi-periodic features on time scales from 100 seconds down to a few milliseconds. The characteristic frequencies of the different components can change on very short time scales. However, some of these signals are elusive as they are very weak and are drowned in intrinsic and instrumental noise. The physical nature of these signals is still largely unknown, but it is clear that they originate from gas orbiting a few kilometers from the central black hole and accreting onto it. In addition of being important for the study of the accretion of matter onto a black hole, these observational properties constitute a unique probe for testing General Relativity in the strong field regime. I review the current observational status as well as the techniques used to study these signals.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 13:47:27 GMT" } ]
2008-02-05T00:00:00
[ [ "Belloni", "Tomaso M.", "", "INAF - Osservatorio Astronomico di Brera" ] ]
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802.0377
Maria Colonna
J.Rizzo, Ph.Chomaz, M.Colonna
A new approach to solve the Boltzmann-Langevin equation for fermionic systems
submitted to Nucl. Phys. A
Nucl.Phys.A806:40-64,2008
10.1016/j.nuclphysa.2008.02.304
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new method to introduce phase-space fluctuations in transport theories, corresponding to a full implementation of the Boltzmann-Langevin equation for fermionic systems. It is based on the procedure originally developed by Bauer et al. for transport codes employing the test particle method. In the new procedure, the Pauli principle is carefully checked, leading to a good reproduction of the correct fluctuations in the ``continuum limit'' ($h \to 0$). Accurate tests are carried out in one and two dimensional idealized systems, and finally results for a full 3D application are shown. We stress the reliability of this method, which can be easily plugged into existing tranport codes using test particles, and its general applicability to systems characterized by instabilities, like for instance multifragmentation processes.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:01:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Rizzo", "J.", "" ], [ "Chomaz", "Ph.", "" ], [ "Colonna", "M.", "" ] ]
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802.0378
Jos\'e Miguel Urbano
Jos\'e Francisco Rodrigues, Manel Sanch\'on and Jos\'e Miguel Urbano
The obstacle problem for nonlinear elliptic equations with variable growth and L^1-data
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of this paper is twofold: to prove, for L^1-data, the existence and uniqueness of an entropy solution to the obstacle problem for nonlinear elliptic equations with variable growth, and to show some convergence and stability properties of the corresponding coincidence set. The latter follow from extending the Lewy--Stampacchia inequalities to the general framework of L^1.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:08:06 GMT" } ]
2008-02-05T00:00:00
[ [ "Rodrigues", "José Francisco", "" ], [ "Sanchón", "Manel", "" ], [ "Urbano", "José Miguel", "" ] ]
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802.0379
Julien Vidal
S. Dusuel, K. P. Schmidt, J. Vidal
Creation and Manipulation of Anyons in the Kitaev Model
4 pages, 3 figures, published version
Phys. Rev. Lett. 100, 177204 (2008)
10.1103/PhysRevLett.100.177204
null
cond-mat.other quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the effect of local spin operators in the Kitaev model on the honeycomb lattice. We show, in perturbation around the isolated-dimer limit, that they create Abelian anyons together with fermionic excitations which are likely to play a role in experiments. We derive the explicit form of the operators creating and moving Abelian anyons without creating fermions and show that it involves multi-spin operations. Finally, the important experimental constraints stemming from our results are discussed.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:09:15 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 08:54:18 GMT" } ]
2008-05-06T00:00:00
[ [ "Dusuel", "S.", "" ], [ "Schmidt", "K. P.", "" ], [ "Vidal", "J.", "" ] ]
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802.038
Ute Ebert
T.M.P. Briels, E.M. van Veldhuizen, Ute Ebert
Positive streamers in ambient air and a N2:O2-mixture (99.8 : 0.2)
2 pages, 4 figures, paper is accepted for IEEE Trans. Plasma Sci. and scheduled to appear in June 2008
IEEE Transactions on Plasma Science 36, 906 (2008)
10.1109/TPS.2008.924510
null
physics.plasm-ph physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Photographs show distinct differences between positive streamers in air or in a nitrogen-oxygen mixture (0.2% O2). The streamers in the mixture branch more frequently, but the branches also extinguish more easily. Probably related to that, the streamers in the mixture propagate more in a zigzag manner while they are straighter in air. Furthermore, streamers in the mixture can become longer; they are thinner and more intense.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:17:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Briels", "T. M. P.", "" ], [ "van Veldhuizen", "E. M.", "" ], [ "Ebert", "Ute", "" ] ]
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802.0381
Tamas Biro S
T.S.Biro, K.Urmossy and G.G.Barnafoldi
Pion and Kaon Spectra from Distributed Mass Quark Matter
Talk given at SQM 2007
J.Phys.G35:044012,2008
10.1088/0954-3899/35/4/044012
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
After discussing some hints for possible masses of quasiparticles in quark matter on the basis of lattice equation of state, we present pion and kaon transverse spectra obtained by recombining quarks with distributed mass and thermal cut power-law momenta as well as fragmenting by NLO pQCD with intrinsic $k_T$ {and nuclear} broadening.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:20:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Biro", "T. S.", "" ], [ "Urmossy", "K.", "" ], [ "Barnafoldi", "G. G.", "" ] ]
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802.0382
Alcides Buss
Alcides Buss
A generalized Fourier inversion theorem
15 pages; some typos corrected
Bulletin Braz. Math. Soc. 39(4), 2008, 555-571
10.1007/s00574-008-0004-6
null
math.FA math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we define operator-valued Fourier transforms for suitable integrable elements with respect to the Plancherel weight of a (not necessarily Abelian) locally compact group. Our main result is a generalized version of the Fourier inversion Theorem for strictly-unconditionally integrable Fourier transforms. Our results generalize and improve those previously obtained by Ruy Exel in the case of Abelian groups.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:22:10 GMT" }, { "version": "v2", "created": "Thu, 26 Mar 2009 14:38:04 GMT" } ]
2009-03-26T00:00:00
[ [ "Buss", "Alcides", "" ] ]
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802.0383
Dmitry Talalaev
D. Talalaev
Bethe ansatz and Isomonodromic deformations
14 pages, extended version of the talk given at CQIS-2008, the hypothesis proved
null
10.1007/s11232-009-0051-1
ITEP-TH-03/08
math-ph math.MP nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study symmetries of the Bethe equations for the Gaudin model appeared naturally in the framework of the geometric Langlands correspondence under the name of Hecke operators and under the name of Schlesinger transformations in the theory of isomonodromic deformations, and particularly in the theory of Painlev\'e transcendents.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 13:26:02 GMT" }, { "version": "v2", "created": "Sat, 22 Nov 2008 08:53:36 GMT" } ]
2015-05-13T00:00:00
[ [ "Talalaev", "D.", "" ] ]
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802.0384
Constantinos Simserides Dr.
Constantinos Simserides
Purely orbital diamagnetic to paramagnetic fluctuation of quasi two-dimensional carriers under in-plane magnetic field
4 pages, 6 figures
EXTENDED VERSION in J. Phys.: Condens. Matter 21 (2009) 015304 (6pp)
10.1088/0953-8984/21/1/015304
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An external magnetic field, $H$, applied parallel to a quasi two-dimensional system modifies quantitatively and qualitatively the density of states. Using a self-consistent numerical approach, we study how this affects the entropy, $S$, the free energy, $F$, and the magnetization, $M$, for different sheet carrier concentrations, $N_s$. As a prototype system we employ III-V double quantum wells. We find that although $M$ is mainly in the opposite direction of $H$, the system is not linear. Surprisingly $\partial M / \partial H$ swings between negative and positive values, i.e., we predict an entirely orbital diamagnetic to paramagnetic fluctuation. This phenomenon is important compared to the ideal de Haas-van Alphen effect i.e. the corresponding phenomenon under perpendicular magnetic field.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:28:25 GMT" } ]
2008-12-05T00:00:00
[ [ "Simserides", "Constantinos", "" ] ]
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802.0385
Saak Gabriyelyan S.
S.S. Gabriyelyan
Absolute continuity and singularity of two probability measures on a filtered space
18 pages, no figures
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\mu$ and $\nu$ be fixed probability measures on a filtered space $(\Omega, {\cal F}, ({\cal F}_t)_{t\in {\bf R}^{+}})$. Denote by $\mu_T $ and $\nu_T $ (respectively, $\mu_{T-} $ and $\nu_{T-} $) the restrictions of the measures $\mu$ and $\nu$ on ${\cal F}_T $ (respectively, on ${\cal F}_{T-} $) for a stopping time $T$. We find the Hahn decomposition of $\mu_T $ and $\nu_T $ using the Hahn decomposition of the measures $\mu$, $\nu$, and the Hellinger process $h_t$ in the strict sense of order 1/2. The norm of the absolutely continuous component of $\mu_{T-} $ with respect to $\nu_{T-} $ is computed in terms of density processes and Hellinger integrals.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:29:44 GMT" }, { "version": "v2", "created": "Sun, 16 Mar 2008 11:40:53 GMT" }, { "version": "v3", "created": "Tue, 5 Apr 2011 19:13:18 GMT" }, { "version": "v4", "created": "Wed, 6 Apr 2011 08:44:04 GMT" } ]
2011-04-07T00:00:00
[ [ "Gabriyelyan", "S. S.", "" ] ]
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802.0386
Schmiedmayer Joerg
S. Aigner, L. Della Pietra, Y. Japha, O. Entin-Wohlman, T. David, R. Salem, R. Folman, J. Schmiedmayer
Long-Range Order in Electronic Transport through Disordered Metal Films
null
Science 319, 1226 - 1229, (2008)
10.1126/science.1152458
null
cond-mat.mtrl-sci cond-mat.other quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ultracold atom magnetic field microscopy enables the probing of current flow patterns in planar structures with unprecedented sensitivity. In polycrystalline metal (gold) films we observe long-range correlations forming organized patterns oriented at +/- 45 deg relative to the mean current flow, even at room temperature and at length scales orders of magnitude larger than the diffusion length or the grain size. The preference to form patterns at these angles is a direct consequence of universal scattering properties at defects. The observed amplitude of the current direction fluctuations scales inversely to that expected from the relative thickness variations, the grain size and the defect concentration, all determined independently by standard methods. This indicates that ultracold atom magnetometry enables new insight into the interplay between disorder and transport.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:32:54 GMT" } ]
2008-03-08T00:00:00
[ [ "Aigner", "S.", "" ], [ "Della Pietra", "L.", "" ], [ "Japha", "Y.", "" ], [ "Entin-Wohlman", "O.", "" ], [ "David", "T.", "" ], [ "Salem", "R.", "" ], [ "Folman", "R.", "" ], [ "Schmiedmayer", "J.", "" ] ]
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802.0387
Jos\'e Gaite
Jose Gaite
Geometry and scaling of cosmic voids
18 pages, A&A format, 11 EPS figure files
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
CONTEXT: Cosmic voids are observed in the distribution of galaxies and, to some extent, in the dark matter distribution. If these distributions have fractal geometry, it must be reflected in the geometry of voids; in particular, we expect scaling sizes of voids. However, this scaling is not well demonstrated in galaxy surveys yet. AIMS: Our objective is to understand the geometry of cosmic voids in relation to a fractal structure of matter. We intend to distinguish monofractal voids from multifractal voids, regarding their scaling properties. We plan to analyse voids in the distributions of mass concentrations (halos) in a multifractal and their relation to galaxy voids. METHODS: We make a statistical analysis of point distributions based on the void probability function and correlation functions. We assume that voids are spherical and devise a simple spherical void finder. For continuous mass distributions, we employ the methods of fractal geometry. We confirm the analytical predictions with numerical simulations. Smoothed mass distributions are suitable for the method of excursion sets. RESULTS: Voids are very nonlinear and non-perturbative structures. Voids reflect the fractal geometry of the matter distribution but not always directly: scaling sizes of voids imply fractal geometry, but fractal voids may have a complicated geometry and may not have scaling sizes. Proper multifractal voids are of this type. A natural multifractal biasing model implies that the voids in the galaxy distribution inherit the same complicated geometry. CONCLUSIONS: Current galaxy surveys as well as cosmological N-body simulations indicate that cosmic voids are proper multifractal voids. This implies the presence in the voids of galaxies or, at least, small dark matter halos.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:34:22 GMT" } ]
2008-02-05T00:00:00
[ [ "Gaite", "Jose", "" ] ]
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802.0388
I. A. B. Strachan
Ian A. B. Strachan
Weyl groups and Elliptic Solutions of the WDVV equations
Typographical errors corrected. One result weakened (though with changing the main result). Main theorem rewritten
Advances in Mathematics Volume 224, Issue 5, 1 August 2010, Pages 1801-1838
10.1016/j.aim.2010.01.013
null
math-ph math.DG math.MP nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A functional ansatz is developed which gives certain elliptic solutions of the Witten-Dijkgraaf-Verlinde-Verlinde (or WDVV) equation. This is based on the elliptic trilogarithm function introduced by Beilinson and Levin. For this to be a solution results in a number of purely algebraic conditions on the set of vectors that appear in the ansatz, this providing an elliptic version of the idea, introduced by Veselov, of a V-system. Rational and trigonometric limits are studied together with examples of elliptic V-systems based on various Weyl groups. Jacobi group orbit spaces are studied: these carry the structure of a Frobenius manifold. The corresponding almost dual structure is shown, in the A_N and B_N and conjecturally for an arbitrary Weyl group, to correspond to the elliptic solutions of the WDVV equations. Transformation properties, under the Jacobi group, of the elliptic trilogarithm are derived together with various functional identities which generalize the classical Frobenius-Stickelburger relations.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:39:16 GMT" }, { "version": "v2", "created": "Wed, 4 Nov 2009 11:07:40 GMT" } ]
2020-12-15T00:00:00
[ [ "Strachan", "Ian A. B.", "" ] ]
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802.0389
Oleg Derzhko
Taras Verkholyak, Oleg Derzhko, Taras Krokhmalskii, and Joachim Stolze
Dynamic properties of quantum spin chains: Simple route to complex behavior
null
Phys. Rev. B 76, 144418 (2007) (11 pages)
10.1103/PhysRevB.76.144418
null
cond-mat.str-el cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine dynamic structure factors of spin-1/2 chains with nearest-neighbor interactions of XX and Dzyaloshinskii-Moriya type, and with periodic and random changes in the sign of these interactions. This special kind of inhomogeneity can be eliminated from the Hamiltonian by suitable transformation of the spin variables. As a result, the dynamic structure factors of periodic or random chains can be computed from those of the uniform chains. Using the exact analytical and precise numerical results available for the uniform systems we illustrate the effects of regular alternation or random disorder on dynamic structure factors of quantum spin chains.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:42:31 GMT" } ]
2008-02-05T00:00:00
[ [ "Verkholyak", "Taras", "" ], [ "Derzhko", "Oleg", "" ], [ "Krokhmalskii", "Taras", "" ], [ "Stolze", "Joachim", "" ] ]
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802.039
P. B. Jones
P. B. Jones
Constraints on fall-back disks in radio pulsars and anomalous X-ray pulsars
To be published in Monthly Notices of the Royal Astronomical Society
null
10.1111/j.1365-2966.2008.13057.x
null
astro-ph
null
Calculations have been made of fall-back disk heating by the pulsar wind as distinct from the soft X-rays emitted by the neutron-star surface. The relation between these heating rates and measured near-infrared fluxes in the K and Ks bands places severe constraints on the inner radii of any fall-back disks that may be present in radio pulsars and in some anomalous X-ray pulsars. The lower limits found are so large that the disks concerned can have no significant effect on pulsar spin-down.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 11:58:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Jones", "P. B.", "" ] ]
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802.0391
Simon Vaughan
S. Vaughan (1), P. Uttley (2) ((1) University of Leicester, (2) University of Southampton)
Studying accreting black holes and neutron stars with time series: beyond the power spectrum
13 pages, 6 figures, in "Noise and Fluctuations" Proc. SPIE vol. 6603
null
null
null
astro-ph
null
The fluctuating brightness of cosmic X-ray sources, particularly accreting black holes and neutron star systems, has enabled enormous progress in understanding the physics of turbulent accretion flows, the behaviour of matter on the surfaces of neutron stars and improving the evidence for black holes. Most of this progress has been made by analysing and modelling time series data in terms of their power and cross spectra, as will be discussed in other articles in this volume. Recently, attempts have been made to make use of other aspects of the data, by testing for non-linearity, non-Gaussianity, time asymmetry and by examination of higher order Fourier spectra. These projects, which have been made possible by the vast increase in data quality and quantity over the past decade, are the subject of this article.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:14:24 GMT" } ]
2008-02-05T00:00:00
[ [ "Vaughan", "S.", "" ], [ "Uttley", "P.", "" ] ]
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802.0392
Emilio Santos Corchero
E. S. Corchero
Gravitational vacuum polarization as an alternative to dark matter
9 pages, no figures
null
null
null
gr-qc astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is assumed that the quantum vacuum may be studied as consisting of two contributions, with positive and negative energy respectively, which interact but slightly and may be displaced from each other. Then it is proposed that dark matter may be just an increase of the quantum vacuum energy, with respect to the normal dark energy level, induced by the gravitational field of galaxies or clusters. A simple model is worked out able to reproduce astronomical observations.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:51:12 GMT" } ]
2008-02-08T00:00:00
[ [ "Corchero", "E. S.", "" ] ]
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802.0393
Alexander Dietz
Alexander Dietz (for the LIGO Scientific Collaboration)
GRB-triggered searches for gravitational waves in LIGO data
5 pages, 3 figures, contributed talk, submitted to the proceedings of Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 2007
AIP Conf.Proc.1000:284-288,2008
10.1063/1.2943464
null
gr-qc astro-ph
null
The LIGO gravitational wave detectors have recently reached their design sensitivity and finished a two-year science run. During this period one year of data with unprecedented sensitivity has been collected. I will briefly describe the status of the LIGO detectors and the overall quality of the most recent science run. I also will present results of a search for inspiral waveforms in gravitational wave data coincident with the short gamma ray burst detected on 1st February 2007, with its sky location error box overlapping a spiral arms of M31. No gravitational wave signals were detected and a binary merger in M31 can be excluded at the 99% confidence level.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:21:14 GMT" } ]
2019-08-13T00:00:00
[ [ "Dietz", "Alexander", "", "for the LIGO Scientific Collaboration" ] ]
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802.0394
Stefan Weigert
Stefan Weigert and Michael Wilkinson
Mutually Unbiased Bases for Continuous Variables
5 pages, no figures, revised to be identical to published text
Phys. Rev. A 78, 020303(R) (2008)
10.1103/PhysRevA.78.020303
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The concept of mutually unbiased bases is studied for N pairs of continuous variables. To find mutually unbiased bases reduces, for specific states related to the Heisenberg-Weyl group, to a problem of symplectic geometry. Given a single pair of continuous variables, three mutually unbiased bases are identified while five such bases are exhibited for two pairs of continuous variables. For N = 2, the golden ratio occurs in the definition of these mutually unbiased bases suggesting the relevance of number theory not only in the finite-dimensional setting.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:20:18 GMT" }, { "version": "v2", "created": "Sun, 9 Nov 2008 14:58:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Weigert", "Stefan", "" ], [ "Wilkinson", "Michael", "" ] ]
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802.0395
Enqvist Kari
K. Enqvist, S. Nurmi, D. Podolsky, G.I. Rigopoulos (University of Helsinki and Helsinki Institute of Physics)
On the divergences of inflationary superhorizon perturbations
12 pages
JCAP 0804:025,2008
10.1088/1475-7516/2008/04/025
HIP-2008-05/TH
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the infrared divergences that appear to plague cosmological perturbation theory. We show that within the stochastic framework they are regulated by eternal inflation so that the theory predicts finite fluctuations. Using the $\Delta N$ formalism to one loop, we demonstrate that the infrared modes can be absorbed into additive constants and the coefficients of the diagrammatic expansion for the connected parts of two and three-point functions of the curvature perturbation. As a result, the use of any infrared cutoff below the scale of eternal inflation is permitted, provided that the background fields are appropriately redefined. The natural choice for the infrared cutoff would of course be the present horizon; other choices manifest themselves in the running of the correlators. We also demonstrate that it is possible to define observables that are renormalization group invariant. As an example, we derive a non-perturbative, infrared finite and renormalization point independent relation between the two-point correlators of the curvature perturbation for the case of the free single field.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:29:31 GMT" } ]
2009-06-23T00:00:00
[ [ "Enqvist", "K.", "", "University of\n Helsinki and Helsinki Institute of Physics" ], [ "Nurmi", "S.", "", "University of\n Helsinki and Helsinki Institute of Physics" ], [ "Podolsky", "D.", "", "University of\n Helsinki and Helsinki Institute of Physics" ], [ "Rigopoulos", "G. I.", "", "University of\n Helsinki and Helsinki Institute of Physics" ] ]
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802.0396
Tapan Mishra
Meetu Sethi Luthra, Tapan Mishra, Ramesh V. Pai, B. P. Das
Phase diagram of a bosonic ladder with two coupled chains
6 pages, 10 figures
null
null
null
cond-mat.stat-mech cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a bosonic ladder with two coupled chains using the finite size density matrix renormalisation group method. We show that in a commensurate bosonic ladder the critical on-site interaction ($U_C$) for the superfluid to Mott insulator transition becomes larger as the inter-chain hopping ($t_\bot$)increases. We analyze this quantum phase transition and obtain the phase diagram in the $t_\bot -U$ plane.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:38:58 GMT" } ]
2008-02-05T00:00:00
[ [ "Luthra", "Meetu Sethi", "" ], [ "Mishra", "Tapan", "" ], [ "Pai", "Ramesh V.", "" ], [ "Das", "B. P.", "" ] ]
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802.0397
Janusz Morawiec
Janusz Morawiec
On bounded solutions of a problem of R. Schilling
6 pages
Ann. Math. Sil. 8 (1994), 97-101
null
null
math.CA
null
The paper deals with locally bounded solutions of a Schilling's problem.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:43:37 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 08:17:25 GMT" } ]
2008-02-05T00:00:00
[ [ "Morawiec", "Janusz", "" ] ]
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802.0398
Ian Huston
Ian Huston, James E. Lidsey, Steven Thomas, John Ward
Gravitational Wave Constraints on Multi-Brane Inflation
18 pages, uses iopart.sty; v2: added references, version as published in JCAP
JCAP0805:016,2008
10.1088/1475-7516/2008/05/016
null
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A class of non-canonical inflationary models is identified, where the leading-order contribution to the non-Gaussianity of the curvature perturbation is determined by the sound speed of the fluctuations in the inflaton field. Included in this class of models is the effective action for multiple coincident branes in the finite n limit. The action for this configuration is determined using a powerful iterative technique, based upon the fundamental representation of SU(2). In principle the upper bounds on the tensor-scalar ratio that arise in the standard, single-brane DBI inflationary scenario can be relaxed in such multi-brane configurations if a large and detectable non-Gaussianity is generated. Moreover models with a small number of coincident branes could generate a gravitational wave background that will be observable to future experiments.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:46:04 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 12:04:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Huston", "Ian", "" ], [ "Lidsey", "James E.", "" ], [ "Thomas", "Steven", "" ], [ "Ward", "John", "" ] ]
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802.0399
S. V. Troitsky
Sergey Troitsky
Spectral energy distributions and high-energy emission of BL Lac type objects
v.2: selection effects quantified, discussion of Auger results on BL Lac correlations extended. 5 pages, 4 figures, mn2e.cls style. The definitive version is available at http://www.blackwellsynergy.com
Mon. Not. Roy. Astron. Soc. Lett., 388 (2008) L79
10.1111/j.1745-3933.2008.00503.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on identifications from the Veron and Quasars.org catalogs, we determine the optical-to-X-ray spectral indices for a sample of 201 BL Lac type objects (BLLs) and search for trends in the distribution of these indices of the sources detected in high-energy bands. We find that EGRET-detected sources are low-energy peaked and that the positional correlation with the arrival directions of ultra-high-energy cosmic rays from the previously studied AGASA, Yakutsk and High Resolution Fly's Eye samples is dominated by low-energy-peaked BLLs.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:49:42 GMT" }, { "version": "v2", "created": "Fri, 11 Jul 2008 05:01:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Troitsky", "Sergey", "" ] ]
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802.04
Paola Andreani
Robertio Vio (Chip Computers Consulting) and Paola Andreani (ESO, INAF-OAT)
A Modified ICA Approach for Signal Separation in CMB Maps
12 pages, 6 Encapsulated Postscript figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
AIMS: One of the most challenging and important problem of digital signal processing in Cosmology is the separation of foreground contamination from cosmic microwave background (CMB). This problem becomes even more difficult in situations, as the CMB polarization observations, where the amount of available "a priori" information is limited. In this case, it is necessary to resort to the "blind separation" methods. One important member of this class is represented by the "Independent Components Analysis" (ICA). In its original formulation, this method has various interesting characteristics, but also some limits. One of the most serious is the difficulty to take into account any information available in advance. In particular, ICA is not able to exploit the fact that emission of CMB is the same at all the frequencies of observations. Here, we show how to deal with this question. The connection of the proposed methodology with the "Internal Linear Composition" (ILC) technique is also illustrated. METHODS: A modification of the classic ICA approach is presented and its characteristics are analyzed both analytically and by means of numerical experiments. RESULTS: The modified version of ICA appears to provide more stable results and of better quality.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 12:54:03 GMT" } ]
2008-02-05T00:00:00
[ [ "Vio", "Robertio", "", "Chip Computers Consulting" ], [ "Andreani", "Paola", "", "ESO,\n INAF-OAT" ] ]
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802.0401
Khikmat Muminov
D. A. Abdushukurov, D.V.Bondarenko, Kh.Kh.Muminov, D.Yu.Chistyakov
Contribution of nano-scale effects to the total efficiency of converters of thermal neutrons on the basis of gadolinium foils
9 pages, 3 figures
null
null
null
physics.ins-det nucl-ex nucl-th
http://creativecommons.org/licenses/publicdomain/
We study the influence of nano-scale layers of converters made from natural gadolinium and its 157 isotope into the total efficiency of registration of thermal neutrons. Our estimations show that contribution of low-energy Auger electrons with the runs about nanometers in gadolinium, to the total efficiency of neutron converters in this case is essential and results in growth of the total efficiency of converters. The received results are in good consent to the experimental data.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 16:45:01 GMT" } ]
2008-02-05T00:00:00
[ [ "Abdushukurov", "D. A.", "" ], [ "Bondarenko", "D. V.", "" ], [ "Muminov", "Kh. Kh.", "" ], [ "Chistyakov", "D. Yu.", "" ] ]
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802.0402
Monika Winklmeier
Monika Winklmeier, Osanobu Yamada
On the local energy decay of solutions of the Dirac equation in the non-extreme Kerr-Newman metric, I
null
J. Phys. A: Math. Theor. 42 (2009) 295204
null
null
math-ph math.MP
null
We investigate the local energy decay of solutions of the Dirac equation in the non-extreme Kerr-Newman metric. First, we write the Dirac equation as a Cauchy problem and define the Dirac operator. It is shown that the Dirac operator is selfadjoint in a suitable Hilbert space. With the RAGE theorem, we show that for each particle its energy located in any compact region outside of the event horizon of the Kerr-Newman black hole decays in the time mean.
[ { "version": "v1", "created": "Mon, 4 Feb 2008 13:36:15 GMT" } ]
2009-07-20T00:00:00
[ [ "Winklmeier", "Monika", "" ], [ "Yamada", "Osanobu", "" ] ]
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