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The Generalized Canonical Ensemble and Its Universal Equivalence with the Microcanonical Ensemble

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Abstract

This paper shows for a general class of statistical mechanical models that when the microcanonical and canonical ensembles are nonequivalent on a subset of values of the energy, there often exists a generalized canonical ensemble that satisfies a strong form of equivalence with the microcanonical ensemble that we call universal equivalence. The generalized canonical ensemble that we consider is obtained from the standard canonical ensemble by adding an exponential factor involving a continuous function g of the Hamiltonian. For example, if the microcanonical entropy is C2, then universal equivalence of ensembles holds with g taken from a class of quadratic functions, giving rise to a generalized canonical ensemble known in the literature as the Gaussian ensemble. This use of functions g to obtain ensemble equivalence is a counterpart to the use of penalty functions and augmented Lagrangians in global optimization. linebreak Generalizing the paper by Ellis et al. [J. Stat. Phys. 101:999–1064 (2000)], we analyze the equivalence of the microcanonical and generalized canonical ensembles both at the level of equilibrium macrostates and at the thermodynamic level. A neat but not quite precise statement of one of our main results is that the microcanonical and generalized canonical ensembles are equivalent at the level of equilibrium macrostates if and only if they are equivalent at the thermodynamic level, which is the case if and only if the generalized microcanonical entropy s–g is concave. This generalizes the work of Ellis et al., who basically proved that the microcanonical and canonical ensembles are equivalent at the level of equilibrium macrostates if and only if they are equivalent at the thermodynamic level, which is the case if and only if the microcanonical entropy s is concave.

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Authors and Affiliations

  1. Department of Mathematics and Statistics, University of Massachusetts, Amherst, MA, 01003, USA

    Marius Costeniuc, Richard S. Ellis & Bruce Turkington

  2. School of Mathematical Sciences, Queen Mary, University of London, London, E1 4NS, UK

    Hugo Touchette

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  1. Marius Costeniuc
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  2. Richard S. Ellis
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  3. Hugo Touchette
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  4. Bruce Turkington
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Correspondence to Richard S. Ellis.

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Costeniuc, M., Ellis, R.S., Touchette, H. et al. The Generalized Canonical Ensemble and Its Universal Equivalence with the Microcanonical Ensemble. J Stat Phys 119, 1283–1329 (2005). https://doi.org/10.1007/s10955-005-4407-0

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