Strict hyperbolization and special cubulation

Geometry Topology Seminar
Monday, April 25, 2022 - 2:00pm for 1 hour (actually 50 minutes)
skies 006
Ruffoni, Lorenzo – Tufts University –
Beibei Liu

Abstract: Gromov introduced some “hyperbolization” procedures, i.e. some procedures that turn a given polyhedron into a space of non-positive curvature. Charney and Davis developed a refined “strict hyperbolization” procedure that outputs a space of strictly negative curvature. Their procedure has been used to construct new examples of manifolds and groups with negative curvature, and other prescribed features. We construct actions of the resulting groups on CAT(0) cube complexes. As an application, we obtain that they are virtually special, hence linear over the integers and residually finite. This is joint work with J. Lafont.