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Showing 2008Show all

201 papers · 1 filter

math.AG2008★ 10 cited

Torelli theorem for the Deligne--Hitchin moduli space

Indranil Biswas, Tomas L. Gomez, Norbert Hoffmann +1

Fix integers and , with if . Given a compact connected Riemann surface of genus , let $\MDH(X)$ denote the corresponding $\text{SL}(r, {\ma…

cond-mat.mes-hall2008★ 6 cited

Thermal States of Anyonic Systems

S. Iblisdir, D. Perez-Garcia, M. Aguado +1

A study of the thermal properties of two-dimensional topological lattice models is presented. This work is relevant to assess the usefulness of these systems as a quantum memory. F…

math.SG2008★ 17 cited

Some remarks on the size of tubular neighborhoods in contact topology and fillability

Klaus Niederkrüger, Francisco Presas

The well-known tubular neighborhood theorem for contact submanifolds states that a small enough neighborhood of such a submanifold N is uniquely determined by the contact structure…

math-ph2008

Superintegrable potentials on 3D Riemannian and Lorentzian spaces with non-constant curvature

Angel Ballesteros, Alberto Enciso, Francisco J. Herranz +1

A quantum sl(2,R) coalgebra is shown to underly the construction of a large class of superintegrable potentials on 3D curved spaces, that include the non-constant curvature analogu…

hep-ph2008★ 43 cited

Quark mass dependence of the pion vector form factor

Feng-Kun Guo, Christoph Hanhart, Felipe J. Llanes-Estrada +1

We examine the quark mass dependence of the pion vector form factor, particularly the curvature (mean quartic radius). We focus our study on the consequences of assuming that the c…

astro-ph2008★ 3 cited

Cosmological density perturbations in modified gravity theories

A. de la Cruz-Dombriz, A. Dobado, A. L. Maroto

In the context of f(R) theories of gravity, we study the cosmological evolution of scalar perturbations by using a completely general procedure. We find that the exact fourth-order…

astro-ph2008★ 21 cited

MAGIC Observations of PG 1553+113 during a Multiwavelength Campaign in July 2006

MAGIC Collaboration, Albert

The active galactic nucleus PG 1553+113 was observed by the MAGIC telescope in July 2006 during a multiwavelength campaign, in which telescopes in the optical, X-ray, and very high…

quant-ph2008★ 2 cited

Wigner function for twisted photons

I. Rigas, L. L. Sanchez-Soto, A. B. Klimov +2

A comprehensive theory of the Weyl-Wigner formalism for the canonical pair angle-angular momentum is presented, with special emphasis in the implications of rotational periodicity…

cond-mat.dis-nn2008★ 17 cited

The Spin Glass Phase in the Four-State, Three-Dimensional Potts Model

A. Cruz, L. A. Fernandez, A. Gordillo-Guerrero +17

We perform numerical simulations, including parallel tempering, on the Potts glass model with binary random quenched couplings using the JANUS application-oriented computer. We fin…

astro-ph2008

On the dark energy rest frame and the CMB

Jose Beltran Jimenez, Antonio L. Maroto

Dark energy is usually parametrized as a perfect fluid with negative pressure and a certain equation of state. Besides, it is supposed to interact very weakly with the rest of the…

hep-ph2008★ 1 cited

eta/s is critical (at phase transitions)

Antonio Dobado, Felipe J. Llanes-Estrada, Juan M. Torres-Rincon

The viscosity over entropy density ratio, or KSS number, can help isolate the critical point in the hadron phase-diagram in Relativistic Heavy Ion Collisions. We argue that this qu…

astro-ph2008★ 20 cited

Avoiding the dark energy coincidence problem with a cosmic vector

Jose Beltran Jimenez, Antonio L. Maroto

We show that vector theories on cosmological scales are excellent candidates for dark energy. We consider two different examples, both are theories with no dimensional parameters n…

math-ph2008★ 69 cited

Superintegrability on N-dimensional curved spaces: Central potentials, centrifugal terms and monopoles

Angel Ballesteros, Alberto Enciso, Francisco J. Herranz +1

The N-dimensional Hamiltonian H formed by a curved kinetic term (depending on a function f), a central potential (depending on a function U), a Dirac monopole term, and N centrifug…

astro-ph2008★ 112 cited

The June 2008 flare of Markarian 421 from optical to TeV energies

The Agile Collaboration, Webt Collaboration, Magic Collaboration +2

We present optical, X-ray, high energy ( GeV) and very high energy ( GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken betwee…

nucl-th2008

Recent topics of mesic atoms and mesic nuclei -- mesic nuclei exist ?--

J. Yamagata-Sekihara, S. Hirenzaki, D. Cabrera +1

We study -meson production in nuclei to investigate the in-medium modification of the -meson spectral function at finite density. We consider (), () and ($π^…

hep-ph2008★ 47 cited

Local Two-Photon Couplings and the J=0 Fixed Pole in Real and Virtual Compton Scattering

Stanley J. Brodsky, Felipe J. Llanes-Estrada, Adam P. Szczepaniak

The local coupling of two photons to the fundamental quark currents of a hadron gives an energy-independent contribution to the Compton amplitude proportional to the charge squared…

cond-mat.mtrl-sci2008★ 44 cited

Structure and magnetism in ultrathin iron oxides characterized by low energy electron microscopy

Benito Santos, Elena Loginova, Arantzazu Mascaraque +3

We have grown epitaxial films a few atomic layers thick of iron oxides on ruthenium. We characterize the growth by low energy electron microscopy. Using selected area diffraction a…

cond-mat.stat-mech2008★ 15 cited

Thermalization dynamics close to a quantum phase transition

Dario Patanè, Alessandro Silva, Fernando Sols +1

We investigate the dissipative dynamics of a quantum critical system in contact with a thermal bath. In analogy with the standard protocol employed to analyze aging, we study the r…

quant-ph2008★ 55 cited

Competing many-body interactions in systems of trapped ions

A. Bermudez, D. Porras, M. A. Martin-Delgado

We propose and theoretically analyse an experimental configuration in which lasers induce 3-spin interactions between trapped ions.By properly choosing the intensities and frequenc…

hep-lat2008★ 35 cited

Unifying all classical spin models in a Lattice Gauge Theory

G. De las Cuevas, W. Dür, H. J. Briegel +1

We show that the partition function of all classical spin models, including all discrete Standard Statistical Models and all abelian discrete Lattice Gauge Theories (LGTs), can be…

astro-ph2008★ 61 cited

Reliability of the detection of the Baryon Acoustic Peak

Vicent J. Martinez, Pablo Arnalte-Mur, Enn Saar +5

The correlation function of the distribution of matter in the universe shows, at large scales, baryon acoustic oscillations, which were imprinted prior to recombination. This featu…

cond-mat.stat-mech2008★ 54 cited

Coarse-grained models for fluids and their mixtures: Comparison of Monte Carlo studies of their phase behavior with perturbation theory and experiment

B. M. Mognetti, P. Virnau, L. Yelash +4

The prediction of the equation of state and the phase behavior of simple fluids (noble gases, carbon dioxide, benzene, methane, short alkane chains) and their mixtures by Monte Car…

astro-ph2008★ 125 cited

Improving the performance of the single-dish Cherenkov telescope MAGIC through the use of signal timing

MAGIC Collaboration

The Cherenkov light flashes produced by Extensive Air Showers are very short in time. A high bandwidth and fast digitizing readout, therefore, can minimize the influence of the bac…

hep-th2008★ 17 cited

Non Abelian Chern-Simons-Higgs solutions in (2+1) dimensions

Francisco Navarro-Lerida, Eugen Radu, D. H. Tchrakian

Non Abelian vortices of a SU(2) Chern-Simons--Higgs theory in 2+1 dimensions are constructed numerically. They represent natural counterparts of the U(1) solutions considered by Ho…