49 citations · 69 across the 4 of their papers we have counts for
4 papers
Mixing, Ergodicity and the Fluctuation-Dissipation Theorem in complex systems
M. H. Vainstein, I. V. L. Costa, F. A. Oliveira
Complex systems such as glasses, gels, granular materials, and systems far from equilibrium exhibit violation of the ergodic hypothesis (EH) and of the fluctuation-dissipation theo…
Non-exponential relaxation for anomalous diffusion
Mendeli H. Vainstein, Ismael V. L. Costa, Rafael Morgado +1
We study the relaxation process in normal and anomalous diffusion regimes for systems described by a generalized Langevin equation (GLE). We demonstrate the existence of a very gen…
Stochastic description of the dynamics of the random-exchange Heisenberg chain
M. H. Vainstein, R. Morgado, F. A. Oliveira +2
We study the diffusion process in a Heisenberg chain with correlated spatial disorder, with a power spectrum in the momentum space behaving as , using a stochastic descript…
Breakdown of the Fluctuation-Dissipation Theorem for fast superdiffusion
Ismael V. L. Costa, Rafael Morgado, Marcos V. B. T. Lima +1
We study anomalous diffusion for one-dimensional systems described by a generalized Langevin equation. We show that superdiffusion can be classified in slow superdiffusion and fast…