Graph products and measure equivalence: classification, rigidity, and quantitative aspects

A Escalier, C Horbez - arXiv preprint arXiv:2401.04635, 2024 - arxiv.org
We study graph products of groups from the viewpoint of measured group theory. We first
establish a full measure equivalence classification of graph products of countably infinite …

Stable cylinders and fine structures for hyperbolic groups and curve graphs

H Petyt, D Spriano, A Zalloum - arXiv preprint arXiv:2501.13600, 2025 - arxiv.org
In 1995, Rips and Sela asked if torsionfree hyperbolic groups admit globally stable
cylinders. We establish this property for all residually finite hyperbolic groups and curve …

A Quantitative Selberg's Lemma

T Gelander, R Slutsky - arXiv preprint arXiv:2311.15976, 2023 - arxiv.org
We show that an arithmetic lattice $\Gamma $ in a semi-simple Lie group $ G $ contains a
torsion-free subgroup of index $\delta (v) $ where $ v=\mu (G/\Gamma) $ is the co-volume of …

Commensurated hyperbolic subgroups

N Lazarovich, A Margolis, M Mj - Transactions of the American …, 2024 - ams.org
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 …

Failure of quasi-isometric rigidity for infinite-ended groups

N Lazarovich, E Stark - arXiv preprint arXiv:2310.03644, 2023 - arxiv.org
We prove that an infinite-ended group whose one-ended factors have finite-index subgroups
and are in a family of groups with a nonzero multiplicative invariant is not quasi-isometrically …

Marked Length Spectrum and Arithmeticity

Y Hao - 2023 - search.proquest.com
Marked Length Spectrum and Arithmeticity Marked Length Spectrum and Arithmeticity
Abstract This dissertation considers the marked length spectrum of negatively curved closed …