Strongly continuous orbit equivalence of one-sided topological Markov shifts

TL;DR

The paper introduces a new notion of strongly continuous orbit equivalence for one-sided topological Markov shifts, linking it to topological conjugacy of their two-sided shifts and isomorphisms of associated Cuntz-Krieger algebras.

Contribution

It establishes a characterization of strongly continuous orbit equivalence via Cuntz-Krieger algebra isomorphisms and gauge action conjugacy, and provides an example distinguishing this from topological conjugacy.

Findings

Strongly continuous orbit equivalence implies topological conjugacy of two-sided shifts.

Characterization of equivalence via Cuntz-Krieger algebra isomorphisms.

Existence of shifts that are strongly orbit equivalent but not topologically conjugate.

Abstract

We will introduce a notion of strongly continuous orbit equivalence in one-sided topological Markov shifts. Strongly continuous orbit equivalence yields a topological conjugacy between their two-sided topological Markov shifts $(\bar{X}_A, \bar{\sigma}_A)$ and $(\bar{X}_B, \bar{\sigma}_B)$. We prove that one-sided topological Markov shifts $(X_A, \sigma_A)$ and $(X_B, \sigma_B)$ are strongly continuous orbit equivalent if and only if there exists an isomorphism bewteen the Cuntz-Krieger algebras ${\mathcal{O}}_A$ and ${\mathcal{O}}_B$ preserving their maximal commutative $C^*$-subalgebras $C(X_A)$ and $C(X_B)$ and giving cocycle conjugate gauge actions. An example of one-sided topological Markov shifts which are strongly continuous orbit equivalent but not one-sided topologically conjugate is presented.