Year: 2026
Type: preprint
Abstract: Let $Γ$ be a Coxeter graph, and let $S$ be its vertex set. An elemental complex over $Γ$ is an abstract simplicial complex $\mathcal D$ on $S$ that contains every pair $\{s, t\}$ with $s \neq t$ and $m_{s,t} \neq \infty$. To each elemental complex $\mathcal D$, we associate a cube complex $Ξ_{\mathcal D}$ on which the virtual Artin group ${\rm VA} [Γ]$ acts. We prove that $Ξ_{\mathcal D}$ is connected, simply connected, and locally regular; that the action of ${\rm VA}[Γ]$ on $Ξ_{\mathcal D}$ is regular, cocompact, and by isometries; and that the stabilizers of cells are parabolic subgroups. We finally prove that $Ξ_{\mathcal D}$ is CAT(0) if and only if ${\mathcal D}$ is a flag complex.
Source: arXiv (Cornell University)
Authors: Mateos, José Galvez, Paris, Luis
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Funder: Agence Nationale de la Recherche
OpenAlex ID: W7171702935