Extensions of multicurve stabilizers are hierarchically hyperbolic
arXiv:2107.14116 · doi:10.2140/gt.2025.29.3187
Abstract
For a closed and orientable surface of genus at least 2, we prove the surface group extensions of the stabilizers of multicurves are hierarchically hyperbolic groups. This answers a question of Durham, Dowdall, Leininger, and Sisto. We also include an appendix that employs work of Charney, Cordes, and Sisto to characterize the Morse boundaries of hierarchically hyperbolic groups whose largest acylindrical action on a hyperbolic space is on a quasi-tree.
arXiv commentVersion accepted to Geometry & Topology
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