KMS states on finite-graph C*-algebras

Tsuyoshi Kajiwara, Yasuo Watatani

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


We study Kubo-Martin-Schwinger (KMS) states on finite-graph C*-algebras with sinks and sources. We compare finite-graph C*-algebras with C*-algebras associated with complex dynamical systems of rational functions. We show that if the inverse temperature β is large, then the set of extreme β-KMS states is parametrized by the set of sinks of the graph. This means that the sinks of a graph correspond to the branched points of a rational function from the point of KMS states. Since we consider graphs with sinks and sources, left actions of the associated bimodules are not injective. Then the associated graph C*-algebras are realized as (relative) Cuntz-Pimsner algebras studied by Katsura. We need to generalize Laca-Neshvyev's theorem of the construction of KMS states on Cuntz-Pimsner algebras to the case that left actions of bimodules are not injective.

Original languageEnglish
Pages (from-to)83-104
Number of pages22
JournalKyushu Journal of Mathematics
Issue number1
Publication statusPublished - Jul 25 2013
Externally publishedYes


  • C*-correspondences
  • Graph C*-algebras
  • KMS states

ASJC Scopus subject areas

  • General Mathematics


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