English

Hierarchically hyperbolic groups are determined by their Morse boundaries

Geometric Topology 2018-01-16 v1 Group Theory

Abstract

We generalize a result of Paulin on the Gromov boundary of hyperbolic groups to the Morse boundary of proper, maximal hierarchically hyperbolic spaces admitting cocompact group actions by isometries. Namely we show that if the Morse boundaries of two such spaces each contain at least three points, then the spaces are quasi-isometric if and only if there exists a 2-stable, quasi-m\"obius homeomorphism between their Morse boundaries. Our result extends a recent result of Charney-Murray, who prove such a classification for CAT(0) groups, and is new for mapping class groups and the fundamental groups of 33-manifolds without Nil or Sol components.

Keywords

Cite

@article{arxiv.1801.04867,
  title  = {Hierarchically hyperbolic groups are determined by their Morse boundaries},
  author = {Sarah C. Mousley and Jacob Russell},
  journal= {arXiv preprint arXiv:1801.04867},
  year   = {2018}
}

Comments

20 pages, 2 figures

R2 v1 2026-06-22T23:45:29.239Z