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Journal of Statistical Physics

, Volume 177, Issue 3, pp 485–505 | Cite as

On Entropy Minimization and Convergence

  • S. DostoglouEmail author
  • A. Hughes
  • Jianfei Xue
Article
  • 106 Downloads

Abstract

We examine the minimization of information entropy for measures on the phase space of bounded domains, subject to constraints that are averages of grand canonical distributions. We describe the set of all such constraints and show that it equals the set of averages of all probability measures absolutely continuous with respect to the standard measure on the phase space (with the exception of the measure concentrated on the empty configuration). We also investigate how the set of constrains relates to the domain of the microcanonical thermodynamic limit entropy. We then show that, for fixed constraints, the parameters of the corresponding grand canonical distribution converge, as volume increases, to the corresponding parameters (derivatives, when they exist) of the thermodynamic limit entropy. The results hold when the energy is the sum of any stable, tempered interaction potential that satisfies the Gibbs variational principle (e.g. Lennard-Jones) and the kinetic energy. The same tools and the strict convexity of the thermodynamic limit pressure for continuous systems (valid whenever the Gibbs variational principle holds) give solid foundation to the folklore local homeomorphism between thermodynamic and macroscopic quantities.

Keywords

Entropy minimization Thermodynamic limit Grand canonical ensemble Strict convexity Convex conjugate 

Mathematics Subject Classification

82B05 82B21 

Notes

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Authors and Affiliations

  1. 1.Department of MathematicsUniversity of MissouriColumbiaUSA
  2. 2.Department of MathematicsUniversity of ArizonaTucsonUSA

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