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We prove that the group of outer automorphisms of the free Coxeter group $W_n$ is acylindrically hyperbolic in the sense of Osin. As an application, we observe that any CAT(0) space admitting a geometric action by Out($W_n$) must contain a…

Group Theory · Mathematics 2020-09-22 Brendan Burns Healy

We classify the effective and transitive actions of a Lie group $G$ on an n-dimensional non-degenerate hyperboloid (also called real pseudo-hyperbolic space), under the assumption that $G$ is a closed, connected Lie subgroup of…

Differential Geometry · Mathematics 2018-03-21 Gabriel Baditoiu

We generalize a version of small cancellation theory to the class of acylindrically hyperbolic groups. This class contains many groups which admit some natural action on a hyperbolic space, including non-elementary hyperbolic and relatively…

Group Theory · Mathematics 2015-05-22 M. Hull

We show that quasi-isometries of (well-behaved) hierarchically hyperbolic groups descend to quasi-isometries of their maximal hyperbolic space. This has two applications, one relating to quasi-isometry invariance of acylindrical…

Group Theory · Mathematics 2025-01-08 Antoine Goldsborough , Mark Hagen , Harry Petyt , Jacob Russell , Alessandro Sisto

Building on previous results concerning hyperbolicity of groups of Fibonacci type, we give an almost complete classification of the (non-elementary) hyperbolic groups within this class. We are unable to determine the hyperbolicity status of…

Group Theory · Mathematics 2021-04-07 Ihechukwu Chinyere , Gerald Williams

In this article we describe the centres of all Dyer groups. We also give a complete classification of when a Dyer group $D(\Gamma)$ is hyperbolic or acylindricality hyperbolic, with conditions that can easily be read on the Dyer graph…

Group Theory · Mathematics 2024-10-31 Mireille Soergel , Nicolas Vaskou

We show that Morse elements are generic in acylindrically hyperbolic groups. As an application, we observe that fully irreducible outer automorphisms are generic in the outer automorphism group of a finite-rank free group.

Group Theory · Mathematics 2025-04-30 Inhyeok Choi

We prove that acylindrically hyperbolic groups are monotileable. That is, every finite subset of the group is contained in a finite tile. This provides many new examples of monotileable groups, and progress on the question of whether every…

Group Theory · Mathematics 2026-05-14 Joseph MacManus , Lawk Mineh

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…

Geometric Topology · Mathematics 2018-01-16 Sarah C. Mousley , Jacob Russell

The aim of these notes is to connect the theory of hyperbolic and relatively hyperbolic groups to the theory of manifolds and Kleinian groups. We survey some of the extensive work that has been done in the field, and explain many examples.…

Group Theory · Mathematics 2022-11-24 Michael Ben-Zvi , Jiayi Lou , Genevieve S. Walsh

The Vahlen group gives a way for presenting the hyperbolic space of every dimension of a group acting via M\"{o}bius transformations. As Vahlen groups and paravector Vahlen groups are now defined over any field of characteristic different…

Group Theory · Mathematics 2022-01-04 Shaul Zemel

In this paper we prove that whenever $G$ is hyperbolic relative to a family of exact, ressidually finite subgroups $\{H_1, \ldots, H_n\}$, the corresponding von Neumann algebra $\mathcal L(G)$ is solid relative to the family of subalgebras…

Operator Algebras · Mathematics 2025-09-25 Juan Felipe Ariza Mejia , Dulanji Nikethani Amaraweera , Ionut Chifan , Krishnendu Khan

Let $\Gamma$ be a finitely generated group which is hyperbolic relative to a finite family $\{H_1,...,H_n\}$ of subgroups. We prove that $\Gamma$ is uniformly embeddable in a Hilbert space if and only if each subgroup $H_i$ is uniformly…

Group Theory · Mathematics 2007-05-23 Marius Dadarlat , Erik Guentner

We characterize relatively hyperbolic groups whose reduced $C^*$-algebra is simple as those, which have no non-trivial finite normal subgroups.

Group Theory · Mathematics 2011-11-09 G. Arzhantseva , A. Minasyan

We show that if H is a non-elementary hyperbolic commensurated subgroup of infinite index in a hyperbolic group G, then H is virtually a free product of hyperbolic surface groups and free groups. We prove that whenever a one-ended…

Group Theory · Mathematics 2024-04-26 Nir Lazarovich , Alex Margolis , Mahan Mj

We prove that, for $C^1$-generic diffeomorphisms, if a homoclinic class is not hyperbolic, then there is a non-hyperbolic ergodic measure supported on it. This proves a conjecture by D\'iaz and Gorodetski [28]. We also discuss the…

Dynamical Systems · Mathematics 2015-07-30 Cheng Cheng , Sylvain Crovisier , Shaobo Gan , Xiaodong Wang , Dawei Yang

In this paper we show the statement in the title. To any Garside group of finite type, Wiest and the author associated a hyperbolic graph called the \emph{additional length graph} and they used it to show that central quotients of…

Group Theory · Mathematics 2020-10-27 Matthieu Calvez

This paper is a survey dedicated to the following question: given a group acting on some CAT(0) cube complex, how to exploit this action to determine whether or not the group is Gromov / relatively / acylindrically hyperbolic? As much as…

Group Theory · Mathematics 2019-04-29 Anthony Genevois

In this paper, we show that every irreducible $2$-dimensional Artin group $A_{\Gamma}$ of rank at least $3$ is acylindrically hyperbolic. We do this by studying the action of $A_{\Gamma}$ on its modified Deligne complex. Along the way, we…

Group Theory · Mathematics 2021-10-04 Nicolas Vaskou

We give examples of hyperbolic groups with finite-rank free subgroups of huge (Ackermannian) distortion.

Group Theory · Mathematics 2011-05-10 Noel Brady , Will Dison , Tim Riley