Limits of KMS states on Toeplitz algebras of finite graphs

Abstract

The structure of KMS states of Toeplitz algebras associated to finite graphs equipped with the gauge action is determined by an Huef--Laca--Raeburn--Sims. Their results imply that extremal KMS states of type I correspond to vertices, while extremal KMS states at critical inverse temperatures correspond to minimal strongly connected components. The purpose of this article is to clarify the role of non-minimal components and the relation between vertices and minimal components in the KMS-structure. For each component $C_0$ and each vertex $v\in C_0$, the KMS states at the critical inverse temperature of $v$ obtained by the limit of type I KMS states associated to $v$ uniquely decomposes into a convex combination of KMS states associated to minimal components. We show that for each minimal component $C$, the coefficient of the KMS state associated to $C$ is nonzero if and only if there exists a maximal path from $C$ to $C_0$ in the graph of components.

21 pages. Minor Revisions are added in pp.11-12

References in corpus (3)

• Graph inverse semigroups, groupoids and their C*-algebras
• Partial actions and KMS states on relative graph $C^{\ast }$-algebras
• C*-dynamical invariants and Toeplitz algebras of graphs