Fluctuation relations for anomalous dynamics

Details Fluctuation relations for anomalous dynamics Fluctuation relations for anomalous dynamics

2009-03-20

arxiv.org/abs/0903.3571v1

J.Stat.Mech. L03002 (2009)

Physics

Condensed Matter

Statistical Mechanics

Letter, 9 pages, no figures

Scientific paper

10.1088/1742-5468/2009/03/L03002

We consider work fluctuation relations (FRs) for generic types of dynamics generating anomalous diffusion: Levy flights, long-correlated Gaussian processes and time-fractional kinetics. By combining Langevin and kinetic approaches we calculate the probability distributions of mechanical and thermodynamical work in two paradigmatic nonequilibrium situations, respectively: a particle subject to a constant force and a particle in a harmonic potential dragged by a constant force. We check the transient FR for two models exhibiting superdiffusion, where a fluctuation-dissipation relation does not exist, and for two other models displaying subdiffusion, where there is a fluctuation-dissipation relation. In the two former cases the conventional transient FR is not recovered, whereas in the latter two it holds either exactly or in the long-time limit.

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