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Topological approach to phase transitions and inequivalence of statistical ensembles

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  • Kastner, Michael

Abstract

The relation between thermodynamic phase transitions in classical systems and topology changes in their state space is discussed for systems in which equivalence of statistical ensembles does not hold. As an example, the spherical model with mean field-type interactions is considered. Exact results for microcanonical and canonical quantities are compared with topological properties of a certain family of submanifolds of the state space. Due to the observed ensemble inequivalence, a close relation is expected to exist only between the topological approach and one of the statistical ensembles. It is found that the observed topology changes can be interpreted meaningfully when compared to microcanonical quantities.

Suggested Citation

  • Kastner, Michael, 2006. "Topological approach to phase transitions and inequivalence of statistical ensembles," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 359(C), pages 447-454.
    • Handle: RePEc:eee:phsmap:v:359:y:2006:i:c:p:447-454
    DOI: 10.1016/j.physa.2005.06.063
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