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Thermodynamics with generalized ensembles: The class of dual orthodes

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  • Campisi, Michele

Abstract

We address the problem of the foundation of generalized ensembles in statistical physics. The approach is based on Boltzmann's concept of orthodes. These are the statistical ensembles that satisfy the heat theorem, according to which the heat exchanged divided by the temperature is an exact differential. This approach can be seen as a mechanical approach alternative to the well established information-theoretic one based on the maximization of generalized information entropy. Our starting point are the Tsallis escort ensembles which have been previously proved to be orthodes, and have been proved to interpolate between canonical and microcanonical ensembles. Here we shall see that the Tsallis escort ensembles belong to a wider class of orthodes that include the most diverse types of ensembles. All such ensembles admit both a microcanonical-like parametrization (via the energy), and a canonical-like one (via the parameter β). For this reason we name them “dual”. One central result used to build the theory is a generalized equipartition theorem. The theory is illustrated with a few examples and the equivalence of all the dual orthodes is discussed.

Suggested Citation

  • Campisi, Michele, 2007. "Thermodynamics with generalized ensembles: The class of dual orthodes," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 385(2), pages 501-517.
    • Handle: RePEc:eee:phsmap:v:385:y:2007:i:2:p:501-517
    DOI: 10.1016/j.physa.2007.07.004
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    References listed on IDEAS

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    1. Martı́nez, S & Pennini, F & Plastino, A & Tessone, C, 2002. "On the equipartition and virial theorems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 305(1), pages 48-51.
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