Acylindrically hyperbolic groups and their quasi-isometrically embedded subgroups
Abstract
We abstract the notion of an A/QI triple from a number of examples in geometric group theory. Such a triple (G,X,H) consists of a group G acting on a Gromov hyperbolic space X, acylindrically along a finitely generated subgroup H which is quasi-isometrically embedded by the action. Examples include strongly quasi-convex subgroups of relatively hyperbolic groups, convex cocompact subgroups of mapping class groups, many known convex cocompact subgroups of Out(Fn), and groups generated by powers of independent loxodromic WPD elements of a group acting on a Gromov hyperbolic space. We initiate the study of intersection and combination properties of A/QI triples. Under the additional hypothesis that G is finitely generated, we use a method of Sisto to show that H is stable. We apply theorems of Kapovich--Rafi and Dowdall--Taylor to analyze the Gromov boundary of an associated cone-off. We close with some examples and questions.
Cite
@article{arxiv.2105.02333,
title = {Acylindrically hyperbolic groups and their quasi-isometrically embedded subgroups},
author = {Carolyn R. Abbott and Jason F. Manning},
journal= {arXiv preprint arXiv:2105.02333},
year = {2022}
}
Comments
40 pages, 4 figures. Version 2 contains many corrections and improvements in response to referee comments. The most substantial changes are to our account of Sisto's stability argument in Section 5. Questions are now in a separate section