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Artículo
Resonant activation in a simple kinetic model
(American Physical Society, 1994)
We present a very simple Markovian kinetic model displaying a stochastic resonant behavior which is similar to the one found in the escape of a particle over a fluctuating potential barrier. The basic mechanism that is ...
Artículo
Fourier state of a fluidized granular gas
(European Physical Society, 2001)
It is shown that the Boltzmann equation for smooth inelastic hard disks or spheres admits a solution describing a steady state characterized by uniform pressure and linear temperature profile. Such a state has been observed ...
Artículo
Nonequilibrium entropy of a gas
(American Physical Society, 1992)
The Boltzmann entropy of a dilute gas under uniform shear flow is analyzed. The entropy variation associated with viscous heating is evaluated and compared with the local equilibrium expression. For interaction potentials ...
Artículo
Memory effects in the relaxation of ising models
(IOP Publishing Ltd., 2002)
It is analytically shown that the one-dimensional Ising model with Glauber dynamics exhibits short-time memory effects when submitted to an abrupt change in temperature. These effects are qualitatively similar to those ...
Artículo
Transversal inhomogeneities in dilute vibrofluidized granular fluids
(American Physical Society, 2002)
The spontaneous symmetry breaking taking place in the direction perpendicular to the energy flux in a dilute vibrofluidized granular system is investigated, using both a hydrodynamic description and simulation methods. The ...
Artículo
Aging in the one-dimensional Ising model with Glauber dynamics
(IOP Publishing Ltd., 1997-10-01)
We study the zero-temperature limit of the one-dimensional Ising model with nearest-neighbor interactions and Glauber dynamics. An exact evolution equation is derived for the spin-spin two-time correlation functions following ...
Artículo
Anharmonic double-phonon excitations in the interacting boson model
(American Physical Society, 2002-12-01)
Double−γ vibrations in deformed nuclei are analyzed in the context of the interacting boson model. A simple extension of the original version of the model towards higher-order interactions is required to explain the observed ...
Artículo
Metallicity maps of the globular cluster system in the galaxy
(IOP Publishing Ltd., 1993-01-10)
The spatial metallicity distribution in the Galaxy, as depicted by the globular cluster system, is analyzed. Two metallicity maps (on the ω - |Z| plane) corresponding to the halo and disk subsamples (Zinn 1985) have been ...
Artículo
Orientational transitions in a nematic liquid crystal confined by competing surfaces
(American Physical Society, 2001)
The effect of confinement on the orientational structure of a nematic liquid crystal model has been investigated by using a version of density-functional theory. We have focused on the case of a nematic confined by opposing ...
Artículo
Anharmonic double-γ vibrations in nuclei and their description in the interacting boson model
(American Physical Society, 2000-04-01)
Double-γ vibrations in deformed nuclei are studied in the context of the interacting boson model with special reference to their anharmonic character. It is shown that large anharmonicities can be obtained with interactions ...