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quant-ph2004★ 54 cited

Economical quantum cloning in any dimension

Thomas Durt, Jaromir Fiurasek, Nicolas J. Cerf

The possibility of cloning a d-dimensional quantum system without an ancilla is explored, extending on the economical phase-covariant cloning machine found in [Phys. Rev. A {\bf 60…

hep-th2004★ 19 cited

CPT-conserving Hamiltonians and their nonlinear supersymmetrization using differential charge-operators C

B. Bagchi, A. Banerjee, E. Caliceti +4

A brief overview is given of recent developments and fresh ideas at the intersection of PT and/or CPT-symmetric quantum mechanics with supersymmetric quantum mechanics (SUSY QM). W…

hep-th2004★ 30 cited

From very-extended to overextended gravity and M-theories

Francois Englert, Marc Henneaux, Laurent Houart

The formulation of gravity and M-theories as very-extended Kac-Moody invariant theories encompasses, for each very-extended algebra G+++, two distinct actions invariant under the o…

math-ph2004★ 189 cited

Dirac oscillator with nonzero minimal uncertainty in position

C. Quesne, V. M. Tkachuk

In the context of some deformed canonical commutation relations leading to isotropic nonzero minimal uncertainties in the position coordinates, a Dirac equation is exactly solved f…

hep-th2004★ 3 cited

Selfduality of d=2 Reduction of Gravity Coupled to a Sigma-Model

Louis Paulot

Dimensional reduction in two dimensions of gravity in higher dimension, or more generally of d=3 gravity coupled to a sigma-model on a symmetric space, is known to possess an infin…

quant-ph2004★ 35 cited

Scalar and vector modulation instabilities induced by vacuum fluctuations in fibers: numerical study

E. Brainis, D. Amans, S. Massar

We study scalar and vector modulation instabilities induced by the vacuum fluctuations in birefringent optical fibers. To this end, stochastic coupled nonlinear Schrodinger equatio…

astro-ph2004★ 41 cited

Search for extraterrestrial point sources of high energy neutrinos with AMANDA-II using data collected in 2000-2002

The AMANDA Collaboration, M. Ackermann

The results of a search for point sources of high energy neutrinos in the northern hemisphere using data collected by AMANDA-II in the years 2000, 2001 and 2002 are presented. In p…

quant-ph2004★ 3 cited

Measurement of the total energy of an isolated system by an internal observer

S. Massar, S. Popescu

We consider the situation in which an observer internal to an isolated system wants to measure the total energy of the isolated system (this includes his own energy, that of the me…

hep-ph2004★ 8 cited

Mass and decays of Brout-Englert-Higgs scalar with extra generations

J. -M. Frere, A. N. Rozanov, M. I. Vysotsky

The higher bound on the mass of the Brout-Englert-Higgs scalar boson (BEH boson for brevity) arising from radiative corrections is not stable when the Standard Model is extended to…

astro-ph2004★ 110 cited

Photodisintegration of Ultra-High-Energy Cosmic Rays revisited

E. Khan, S. Goriely, D. Allard +5

Recent microscopic and phenomenological calculations of giant dipole resonances for A <= 56 nuclei are presented. The derived photodisintegration cross sections are exhaustively co…

hep-th2004★ 60 cited

Planar plane-wave matrix theory at the four loop order: Integrability without BMN scaling

Thomas Fischbacher, Thomas Klose, Jan Plefka

We study SU(N) plane-wave matrix theory up to fourth perturbative order in its large N planar limit. The effective Hamiltonian in the closed su(2) subsector of the model is explici…

gr-qc2004★ 70 cited

Generalized Smarr relation for Kerr AdS black holes from improved surface integrals

G. Barnich, G. Compere

By using suitably improved surface integrals, we give a unified geometric derivation of the generalized Smarr relation for higher dimensional Kerr black holes which is valid both i…

nlin.CD2004★ 10 cited

Entropy production in diffusion-reaction systems: The reactive random Lorentz gas

Laszlo Matyas, Pierre Gaspard

We report the study of a random Lorentz gas with a reaction of isomerization between the two colors of moving particles elastically bouncing on hard disks.…

quant-ph2004★ 71 cited

Multipartite Asymmetric Quantum Cloning

S. Iblisdir, A. Acin, N. Gisin +3

We investigate the optimal distribution of quantum information over multipartite systems in asymmetric settings. We introduce cloning transformations that take identical replic…

astro-ph2004★ 509 cited

High-energy particle acceleration in the shell of a supernova remnant

H. E. S. S. Collaboration, :, F. Aharonian

A significant fraction of the energy density of the interstellar medium is in the form of high-energy charged particles (cosmic rays). The origin of these particles remains uncerta…

physics.class-ph2004★ 5 cited

Special Relativity: Einstein's Spherical Waves versus Poincare's Ellipsoidal Waves

Dr. Yves Pierseaux

We show that the image by the Lorentz transformation of a spherical (circular) light wave, emitted by a moving source, is not a spherical (circular) light wave but an ellipsoidal (…

math.GT2004★ 10 cited

Homologie de contact des varietes toroidales

Frederic Bourgeois, Vincent Colin

We show that contact homology distinguishes infinitely many tight contact structures on any orientable, toroidal, irreducible 3-manifold. As a consequence of the contact homology c…

hep-th2004★ 169 cited

Massive graviton as a testable cold dark matter candidate

S. L. Dubovsky, P. G. Tinyakov, I. I. Tkachev

We construct a consistent model of gravity where the tensor graviton mode is massive, while linearized equations for scalar and vector metric perturbations are not modified. The Fr…

hep-th2004★ 35 cited

Monopoles Can be Confined by 0, 1 or 2 Vortices

Roberto Auzzi, Stefano Bolognesi, Jarah Evslin

There are three types of monopole in gauge theories with fundamental matter and N=2 supersymmetry broken by a superpotential. There are unconfined 0-monopoles and also 1 and 2-mono…

astro-ph2004★ 47 cited

Deflections of cosmic rays in a random component of the Galactic magnetic field

P. G. Tinyakov, I. I. Tkachev

We express the mean square deflections of the ultra-high energy cosmic rays (UHECR) caused by the random component of the Galactic magnetic field (GMF) in terms of the GMF power sp…

astro-ph2004★ 22 cited

A comparative study of correlations between arrival directions of ultra-high-energy cosmic rays and positions of their potential astrophysical sources

D. S. Gorbunov, S. V. Troitsky

We consider various classes of persistent extragalactic astrophysical sources which have been suggested in literature as possible emitters of ultra-high-energy cosmic rays (UHECR).…

astro-ph2004

Rotation-induced mixing in red giant stars

A. Palacios, C. Charbonnel, S. Talon +1

Red giant stars, both in the field and in globular clusters, present abundance anomalies that can not be explained by standard stellar evolution models. Some of these peculiarities…

astro-ph2004★ 1 cited

How to reconcile the C and s-process abundances in the metal-poor star V453 Oph ?

Pieter Deroo, Stephane Goriely, Lionel Siess +2

In this poster we present a detailed chemical analysis of the RV Tauri star of low intrinsic metallicity, V453 Oph ([Fe/H]=-2.2), which shows a mild but clear s-process surface ove…

quant-ph2004★ 6 cited

Multipartite Nonlocal Quantum Correlations Resistant to Imperfections

H. Buhrman, P. Hoyer, S. Massar +1

We use techniques for lower bounds on communication to derive necessary conditions in terms of detector efficiency or amount of super-luminal communication for being able to reprod…