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arXiv · 2009.03865

Quasi-isometry invariants of weakly special square complexes

Sangrok Oh
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Abstract

We define the intersection complex for the universal cover of a compact weakly special square complex and show that it is a quasi-isometry invariant. By using this quasi-isometry invariant, we study the quasi-isometric classification of 2-dimensional right-angled Artin groups and planar graph 2-braid groups. Our results cover two well-known cases of 2-dimensional right-angled Artin groups: (1) those whose defining graphs are trees and (2) those whose outer automorphism groups are finite. Finally, we show that there are infinitely many graph 2-braid groups which are quasi-isometric to right-angled Artin groups and infinitely many which are not.

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Sangrok Oh. 2020-09-08. Quasi-isometry invariants of weakly special square complexes. https://doi.org/10.1016/j.topol.2021.107945

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