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It is shown that neither the Schrödinger equation nor the Klein-Gordon one with logarithmic nonlinearities have dissipative solutions. In the case of one-dimensional space, numerical experiments with different Cauchy data, in the nonrelativistic[...]texto impreso
It is shown that the Schrödinger equation nor the Klein-Gordon one with logarithmic nonlinearities have dissipative solutions. In the case of one-dimensional space, numerical experiments with different Cauchy data, in the nonrelativistic case, l[...]texto impreso
Brito, Ricardo ; Soto, R. | 2007-12In this paper we present a method to calculate Casimir Forces for non equilibrium systems with long range correlations. The origin of the force are the fluctuating fields, and the modification that the external, macroscopic objects induce in the[...]texto impreso
Brito, Ricardo ; Soto, R. | 2009-12It has been recently reported that a granular mixture in which grains differ in their restitution coefficients presents segregation: the more inelastic particles sink to the bottom. When other segregation mechanisms as buoyancy and the Brazil nu[...]texto impreso
An adiabatic piston, separating two granular gases prepared in the same macroscopic state, is found to eventually collapse to one of the sides. This new instability is explained by a simple macroscopic theory which is furthermore in qualitative [...]texto impreso
The solutions of the homogeneous nonlinear Boltzmann equation for inelastic Maxwell models, when driven by different types of thermostats, show, in general, overpopulated high energy tails of the form similar toexp(-ac), with power law tails and[...]texto impreso
Casimir forces can appear between intrusions placed in different media driven by several fluctuation mechanisms, either in equilibrium or out of it. Herein, we develop a general formalism to obtain such forces from the dynamical equations of the[...]texto impreso
The time dependence of deviations from the Gaussian state in a freely cooling homogeneous system of smooth inelastically colliding spheres is investigated by kinetic theory. We determine the full time dependence of the coefficients of an expansi[...]texto impreso
Rodríguez Parrondo, Juan Manuel ; Blanco, J. M. ; Cao García, Francisco Javier ; Brito, Ricardo | E D P Sciences | 1998-08-01The efficiency of different types of Brownian motors is calculated analytically and numerically. We find that motors based on flashing ratchets present a,low efficiency and an unavoidable entropy production. On the other hand, a certain class of[...]texto impreso
A collisional model of a confined quasi-two-dimensional granular mixture is considered to analyze homogeneous steady states. The model includes an effective mechanism to transfer the kinetic energy injected by vibration in the vertical direction[...]texto impreso
The total energy E(t) in a fluid of inelastic particles is dissipated through inelastic collisions. When such systems are prepared in a homogeneous initial state and evolve undriven, E(t) decays initially as t^(?2) ~ exp[?2?? ] (known as Haff's [...]texto impreso
A lattice gas automaton lacks Galilei invariance, and equilibria of systems moving with a finite speed \u --> \ are not simply related by a Galilei transformation to the equilibrium distribution in the rest frame. In the hydrodynamic description[...]texto impreso
In the present work, we propose a method to determine fluctuation-induced forces in nonequilibrium systems. These forces are the analog of the well-known Casimir forces, which were originally introduced in quantum field theory and later extended[...]texto impreso
We present a generalization of the Green-Kubo expressions for thermal transport coefficients mu in complex fluids of the generic form mu=mu(infinity)+integral(infinity)(0) dtV(-1) (0), i.e. a sum of an instantaneous transp[...]texto impreso
Muñoz Tapia, R. ; Brito, Ricardo ; Rodríguez Parrondo, Juan Manuel | American Physical Society | 2017-09-26Passive filters allowing the exchange of particles in a narrow band of energy are currently used in microrefrigerators and energy transducers. In this Rapid Communication, we analyze their thermal properties using linear irreversible thermodynam[...]
