KMS states on C*-algebras associated to local homeomorphisms

Zahra Afsar; Astrid an Huef; Iain Raeburn

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arXiv · 1402.5712

KMS states on C*-algebras associated to local homeomorphisms

Zahra Afsar·Astrid an Huef·Iain Raeburn

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Abstract

For every Hilbert bimodule over a C*-algebra, there are natural gauge actions of the circle on the associated Toeplitz algebra and Cuntz-Pimsner algebra, and hence natural dynamics obtained by lifting these gauge actions to actions of the real line. We study the KMS states of these dynamics for a family of bimodules associated to local homeomorphisms on compact spaces. For inverse temperatures larger than a certain critical value, we find a large simplex of KMS states on the Toeplitz algebra, and we show that all KMS states on the Cuntz-Pimsner algebra have inverse temperature at most this critical value. We illustrate our results by considering the backward shift on the one-sided path space of a finite graph, where we can use recent results about KMS states on graph algebras to see what happens below the critical value. Our results about KMS states on the Cuntz-Pimsner algebra of the shift show that recent constraints on the range of inverse temperatures obtained by Thomsen are sharp.

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BibTeX RIS

Zahra Afsar, Astrid an Huef, Iain Raeburn. 2014-03-11. KMS states on C*-algebras associated to local homeomorphisms. https://arxiv.org/abs/1402.5712

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