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101 papers · 1 filter

hep-th2004★ 2 cited

A Haldane-Shastry spin chain of BC_N type in a constant magnetic field

A. Enciso, F. Finkel, A. Gonzalez-Lopez +1

We compute the spectrum of the trigonometric Sutherland spin model of BC_N type in the presence of a constant magnetic field. Using Polychronakos's freezing trick, we derive an exa…

cond-mat.mtrl-sci2004★ 15 cited

Igniting homogeneous nucleation

J. C. Neu, L. L. Bonilla, A. Carpio

Transient homogeneous nucleation is studied in the limit of large critical sizes. Starting from pure monomers, three eras of transient nucleation are characterized in the classic B…

hep-th2004★ 184 cited

Vertex functions and infrared fixed point in Landau gauge SU(N) Yang-Mills theory

Reinhard Alkofer, Christian S. Fischer, Felipe J. Llanes-Estrada

The infrared behaviour of vertex functions in an SU(N) Yang-Mills theory in Landau gauge is investigated employing a skeleton expansion of the Dyson-Schwinger equations. The three-…

hep-th2004★ 30 cited

Trouble with space-like noncommutative field theory

V. Gayral, J. M. Gracia-Bondia, F. Ruiz Ruiz

It is argued that the one-loop effective action for a space-like noncommutative scalar field theory does not exist. This indicates that such theories are not renormalizable already…

cond-mat.dis-nn2004★ 67 cited

Localization properties of a one-dimensional tight-binding model with non-random long-range inter-site interactions

F. A. B. F. de Moura, A. V. Malyshev, M. L. Lyra +2

We perform both analytical and numerical studies of the one-dimensional tight-binding Hamiltonian with stochastic uncorrelated on-site energies and non-fluctuating long-range hoppi…

cond-mat.mes-hall2004★ 6 cited

Transport suppression in heterostructures driven by an ac gate voltage

Miguel Rey, Michael Strass, Sigmund Kohler +2

We explore the possibility of inducing in heterostructures driven by an ac gate voltage the coherent current suppression recently found for nanoscale conductors in oscillating fiel…

nucl-th2004★ 42 cited

Superscaling, Scaling Functions and Nucleon Momentum Distributions in Nuclei

A. N. Antonov, M. K. Gaidarov, M. V. Ivanov +4

The scaling functions and from the - and -scaling analyses of inclusive electron scattering from nuclei are explored within the coherent density fluctuation m…

nucl-th2004★ 13 cited

Fluctuations in the level density of a Fermi gas

P. Leboeuf, A. G. Monastra, A. Relano

We present a theory that accurately describes the counting of excited states of a noninteracting fermionic gas. At high excitation energies the results reproduce Bethe's theory. At…

math.AG2004★ 1 cited

On rational cuspidal projective plane curves

J. Fernández de Bobadilla, I. Luengo-Velasco, A. Melle-Hernández +1

In the open problem of classification of rational cuspidal plane curves it is essential to find good necessary conditions on the type of singularities of a curve C in order C to ex…

astro-ph2004

Branon dark matter: an introduction

J. A. R. Cembranos, A. Dobado, A. L. Maroto

This is a brief introduction to branon physics and its role in the dark matter problem. We pay special attention to the phenomenological consequences, both in high-energy particle…

hep-ph2004★ 119 cited

Light scalars as tetraquarks or two-meson states from large Nc and unitarized Chiral Perturbation Theory

J. R. Pelaez

By means of unitarized Chiral Perturbation Theory it is possible to obtain a remarkable description of meson-meson scattering amplitudes up to 1.2 GeV, and generate poles associate…

cond-mat.str-el2004★ 12 cited

Universality Classes of Diagonal Quantum Spin Ladders

M. A. Martin-Delgado, J. Rodriguez-Laguna, G. Sierra

We find the classification of diagonal spin ladders depending on a characteristic integer in terms of ferrimagnetic, gapped and critical phases. We use the finite algorithm D…

quant-ph2004★ 1 cited

On Disagreement about Nonperturbative Corrections in Triple-well Potential

Masatoshi Sato, Toshiaki Tanaka

We examine in detail nonperturbative corrections for low lying energies of a symmetric triple-well potential with non-equivalent vacua, for which there have been disagreement about…

quant-ph2004★ 249 cited

Localizable Entanglement

M. Popp, F. Verstraete, M. A. Martin-Delgado +1

We consider systems of interacting spins and study the entanglement that can be localized, on average, between two separated spins by performing local measurements on the remaining…

hep-ph2004★ 128 cited

The pion-pion scattering amplitude

J. R. Pelaez, F. J. Yndurain

We obtain reliable scattering amplitudes consistent with experimental data, both at low and high energies, and fulfilling appropriate analyticity properties. We do this by fir…

hep-ph2004★ 11 cited

Two-meson cloud contribution to the baryon antidecuplet binding

A. Hosaka, T. Hyodo, F. J. Llanes-Estrada +3

We study the two-meson virtual cloud contribution to the self-energy of the SU(3) antidecuplet, to which the Theta+ pentaquark is assumed to belong. This is motivated by the large…

nlin.SI2004★ 8 cited

Exact Solutions of Integrable 2D Contour Dynamics

Luis Martinez Alonso, Elena Medina

A class of exact solutions of the dispersionless Toda hierarchy constrained by a string equation is obtained. These solutions represent deformations of analytic curves with a finit…

math-ph2004★ 2 cited

A geometric approach to the equilibrium shapes of self-gravitating fluids

Daniel Peralta-Salas

The classification of the possible equilibrium shapes that a self-gravitating fluid can take in a Riemannian manifold is a classical problem in mathematical physics. In this paper…

nucl-th2004

Hadronic aspects of exotic baryons

E. Oset, S. Sarkar, M. J. Vicente Vacas +4

In this talk I look into three different topics, addressing first the possibility that the is a bound state of , exploiting the results of this study to find out the co…

gr-qc2004★ 27 cited

The Pioneer anomaly as acceleration of the clocks

Antonio F. Ranada

This work proposes an explanation of the Pioneer anomaly, the unmodelled and as yet unexplained blueshift detected in the microwave signal of the Pioneer 10 and other spaceships by…

nlin.SI2004★ 6 cited

Integrable Deformations of Algebraic Curves

Y. Kodama, B. Konopelchenko, L. Martinez Alonso

A general scheme for determining and studying integrable deformations of algebraic curves, based on the use of Lenard relations, is presented. We emphasize the use of several types…

cond-mat.supr-con2004★ 23 cited

Vortex-glass transition in superconducting Nb/Cu superlattices

J. E. Villegas, J. L. Vicent

Nb/Cu superconducting superlattices have been fabricated by dc magnetron sputtering. This system shows a vortex glass transition with critical exponents similar to high temperature…

astro-ph2004★ 31 cited

Early-type galaxies in the Coma cluster: a new piece in the calcium puzzle

A. J. Cenarro, P. Sanchez-Blazquez, N. Cardiel +1

We present measurements of the CaII triplet and the Ca4227 Lick-index for a sample of early-type galaxies in the Coma cluster, deriving, for the first time, their corresponding rel…

nlin.SI2004★ 8 cited

Solutions of the Dispersionless Toda Hierarchy Constrained by String Equations

Luis Martinez Alonso, Elena Medina

Solutions of the Riemann-Hilbert problem implementing the twistorial structure of the dispersionless Toda (dToda) hierarchy are obtained. Two types of string equations are consider…