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arxiv: 2509.04613 · v2 · pith:TCJ2XAV2new · submitted 2025-09-04 · 🧮 math.GR · math.GT· math.LO

Hyperfiniteness of the boundary action of virtually special groups

classification 🧮 math.GR math.GTmath.LO
keywords actionboundarygroupshyperfinitenessvirtuallyactingcomplexconsidered
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We prove that for any countable group acting virtually specially on a CAT(0) cube complex, the orbit equivalence relation induced by its action on the Roller boundary is hyperfinite. This can be considered as a generalization of hyperfiniteness of the boundary action of cubulated hyperbolic groups by Huang-Sabok-Shinko.

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