Constructing KMS states from infinite-dimensional spectral triples
Abstract
We construct KMS-states from Li1-summable semifinite spectral triples and show that in several important examples the construction coincides with well-known direct constructions of KMS-states for naturally defined flows. Under further summability assumptions the constructed KMS-state can be computed in terms of Dixmier traces. For closed manifolds, we recover the ordinary Lebesgue integral. For Cuntz-Pimsner algebras with their gauge flow, the construction produces KMS-states from traces on the coefficient algebra and recovers the Laca-Neshveyev correspondence. For a discrete group acting on its Stone-Cech boundary, we recover the Patterson-Sullivan measures on the Stone-Cech boundary for a flow defined from the Radon-Nikodym cocycle.
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