Acylindrical actions for two-dimensional Artin groups of hyperbolic type

preprint2021arXivOpen access

Abstract

For a two-dimensional Artin group AA whose associated Coxeter group is hyperbolic, we prove that the action of AA on the hyperbolic space obtained by coning off certain subcomplexes of its modified Deligne complex is acylindrical. Moreover, if for each s∈Ss\in S there is t∈St\in S with mst<∞m_{st}< \infty, then this action is universal. As a consequence, for ∣S∣≥3|S|\geq 3, if AA is irreducible, then it is acylindrically hyperbolic. We also obtain the Tits alternative for AA, and we classify the subgroups of AA that virtually split as a direct product. A key ingredient in our approach is a simple criterion to show the acylindricity of an action on a two-dimensional CAT(−1)\mathrm{CAT}(-1) complex.

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