Continuous orbit equivalence for bounded speedups of free Z2\mathbb{Z}^2-odometers

Let (XG,σG)(X_{\mathfrak{G}},\sigma_{\mathfrak{G}}) be a free Z2\mathbb{Z}^2-odometer, and let S:Z2X\mathbf{S}:\mathbb{Z}^2\curvearrowright X be a minimal speedup of σG\sigma_{\mathfrak{G}} with bounded speedup cocycle p\mathbf{p}. Two actions are continuously orbit equivalent when there is a homeomorphism between their phase spaces mapping orbits continuously to orbits in both directions. The continuous orbit-equivalence conjecture. The Z2\mathbb{Z}^2-odometer (XG,S)(X_{\mathfrak{G}},\mathbf{S}) is continuously orbit equivalent to (XG,σG)(X_{\mathfrak{G}},\sigma_{\mathfrak{G}}). This is motivated by the example preceding the conjecture, where continuously orbit-equivalent odometers are not isomorphic; the claim is stated as an open problem, at least in the d=2d=2 case.

Sources & referencesView supporting material

Primary source

Aimee S. A. Johnson and David M. McClendon, “Topological speedups of Z^d-actions”, arXiv:2103.02012 (2021).

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