Dynamical foundations of nonextensive statistical mechanics

Details Dynamical foundations of nonextensive statistical mechanics Dynamical foundations of nonextensive statistical mechanics

2001-05-18

arxiv.org/abs/cond-mat/0105374v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.87.180601

We construct classes of stochastic differential equations with fluctuating friction forces that generate a dynamics correctly described by Tsallis statistics and nonextensive statistical mechanics. These systems generalize the way in which ordinary Langevin equations underly ordinary statistical mechanics to the more general nonextensive case. As a main example, we construct a dynamical model of velocity fluctuations in a turbulent flow, which generates probability densities that very well fit experimentally measured probability densities in Eulerian and Lagrangian turbulence. Our approach provides a dynamical reason why many physical systems with fluctuations in temperature or energy dissipation rate are correctly described by Tsallis statistics.

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