Gibbs entropy and irreversible thermodynamics

Details Gibbs entropy and irreversible thermodynamics Gibbs entropy and irreversible thermodynamics

1999-08-25

arxiv.org/abs/cond-mat/9908367v1

Physics

Condensed Matter

Statistical Mechanics

19 pages, 4 eps figures, LaTeX2e

Scientific paper

10.1088/0951-7715/13/6/303

Recently a number of approaches has been developed to connect the microscopic dynamics of particle systems to the macroscopic properties of systems in nonequilibrium stationary states, via the theory of dynamical systems. This way a direct connection between dynamics and Irreversible Thermodynamics has been claimed to have been found. However, the main quantity used in these studies is a (coarse-grained) Gibbs entropy, which to us does not seem suitable, in its present form, to characterize nonequilibrium states. Various simplified models have also been devised to give explicit examples of how the coarse-grained approach may succeed in giving a full description of the Irreversible Thermodynamics. We analyze some of these models pointing out a number of difficulties which, in our opinion, need to be overcome in order to establish a physically relevant connection between these models and Irreversible Thermodynamics.

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