Hyperfiniteness of boundary actions of acylindrically hyperbolic groups
Group Theory
2024-09-17 v2 Logic
Abstract
We prove that for any countable acylidrically hyperbolic group , there exists a generating set of such that the corresponding Cayley graph is hyperbolic, , the natural action of on is acylindrical, and the natural action of on the Gromov boundary is hyperfinite. This result broadens a class of groups that admit a non-elementary acylindrical action on a hyperbolic space with hyperfinite boundary action.
Cite
@article{arxiv.2307.09790,
title = {Hyperfiniteness of boundary actions of acylindrically hyperbolic groups},
author = {Koichi Oyakawa},
journal= {arXiv preprint arXiv:2307.09790},
year = {2024}
}
Comments
Section 5 "Application to topologically amenable actions" was added. Appeared in Forum of Mathematics, Sigma