On the coarse geometry of certain right-angled Coxeter groups

Abstract

Let $\Gamma$ be a connected, triangle-free, planar graph with at least five vertices that has no separating vertices or edges. If the graph $\Gamma$ is $\mathcal{C}\mathcal{F}\mathcal{S}$, we prove that the right-angled Coxeter group $G_{\Gamma }$ is virtually a Seifert manifold group or virtually a graph manifold group and we give a complete quasi-isometry classification of these such groups. Otherwise, we prove that $G_{\Gamma }$ is hyperbolic relative to a collection of $\mathcal{C}\mathcal{F}\mathcal{S}$ right-angled Coxeter subgroups of $G_{\Gamma }$. Consequently, the divergence of $G_{\Gamma }$ is linear, or quadratic, or exponential. We also generalize right-angled Coxeter groups which are virtually graph manifold groups to certain high dimensional right-angled Coxeter groups (our families exist in every dimension) and study the coarse geometry of this collection. We prove that strongly quasiconvex torsion free infinite index subgroups in certain graph of groups are free and we apply this result to our right-angled Coxeter groups.

arXiv comment38 pages, 6 figures. Minor changes and other updates to incorporate referee comments. To appear in Algebraic & Geometric Topology. arXiv admin note: text overlap with arXiv:1708.07818

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• Right-angled Artin subgroups of right-angled Coxeter and Artin groups
• Quasi-Isometries for certain Right-Angled Coxeter Groups
• Visual right-angled Artin subgroups of two-dimensional right-angled Coxeter groups
• RAAGedy right-angled Coxeter groups II: in the quasiisometry class of the tree RAAGs
• Flat braid groups, right-angled Artin groups, and commensurability