Quasicanonical Gibbs distribution and Tsallis nonextensive statistics

Details Quasicanonical Gibbs distribution and Tsallis nonextensive statistics Quasicanonical Gibbs distribution and Tsallis nonextensive statistics

2002-04-17

arxiv.org/abs/cond-mat/0204359v1

Physica A 325 (2003) 409-425

Physics

Condensed Matter

Statistical Mechanics

22 pages, 1 eps-figure

Scientific paper

10.1016/S0378-4371(03)00253-X

We derive and study quasicanonical Gibbs distribution function which is characterized by the thermostat with finite number of particles (quasithermostat). We show that this naturally leads to Tsallis nonextensive statistics and thermodynamics, with Tsallis parameter q is found to be related to the number of particles in the quasithermostat. We show that the chi-square distribution of fluctuating temperature used recently by Beck can be partially understood in terms of normal random momenta of particles in the quasithermostat. Also, we discuss on the importance of the time scale hierarchy and fluctuating probability distribution functions in understanding of Tsallis distribution, within the framework of kinetics of dilute gas and weakly inhomogeneous systems.

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