The Toeplitz noncommutative solenoid and its KMS states
Abstract
We use Katsura's topological graphs to define Toeplitz extensions of Latr\'emoli\`ere and Packer's noncommutative-solenoid C*-algebras. We identify a natural dynamics on each Toeplitz noncommutative solenoid and study the associated KMS states. Our main result shows that the space of extreme points of the KMS simplex of the Toeplitz noncommutative torus at a strictly positive inverse temperature is homeomorphic to a solenoid; indeed, there is an action of the solenoid group on the Toeplitz noncommutative solenoid that induces a free and transitive action on the extreme boundary of the KMS simplex. With the exception of the degenerate case of trivial rotations, at inverse temperature zero there is a unique KMS state, and only this one factors through Latr\'emoli\`ere and Packer's noncommutative solenoid.
Keywords
Cite
@article{arxiv.1608.01782,
title = {The Toeplitz noncommutative solenoid and its KMS states},
author = {Nathan Brownlowe and Mitchell Hawkins and Aidan Sims},
journal= {arXiv preprint arXiv:1608.01782},
year = {2016}
}
Comments
23 pages. v2: Minor corrections. This version accepted for publication in Ergodic Theory and Dynamical Systems