Introduction to Nonextensive Statistical Mechanics and Thermodynamics

Details Introduction to Nonextensive Statistical Mechanics and Thermodynamics Introduction to Nonextensive Statistical Mechanics and Thermodynamics

2003-09-04

arxiv.org/abs/cond-mat/0309093v1

Physics

Condensed Matter

Statistical Mechanics

To appear in the Proceedings of the 1953-2003 Jubilee "Enrico Fermi" International Summer School of Physics {\it The Physics o

Scientific paper

In this lecture we briefly review the definition, consequences and applications of an entropy, $S_q$, which generalizes the usual Boltzmann-Gibbs entropy $S_{BG}$ ($S_1=S_{BG}$), basis of the usual statistical mechanics, well known to be applicable whenever ergodicity is satisfied at the microscopic dynamical level. Such entropy $S_q$ is based on the notion of $q$-exponential and presents properties not shared by other available alternative generalizations of $S_{BG}$. The thermodynamics proposed in this way is generically {\it nonextensive} in a sense that will be qualified. The present framework seems to describe quite well a vast class of natural and artificial systems which are not ergodic nor close to it. The a priori calculation of $q$ is necessary to complete the theory and we present some models where this has already been achieved.

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