The structure of relatively hyperbolic groups in convex real projective geometry

TL;DR

This paper characterizes relatively hyperbolic groups acting on convex domains in real projective space, establishing a structure theorem and boundary correspondence analogous to CAT(0) space results.

Contribution

It provides a general structure theorem for relatively hyperbolic groups in convex projective geometry and characterizes them via invariant convex subsets.

Findings

Established a structure theorem for such groups.

Characterized groups through invariant convex subsets.

Connected Bowditch boundary with ideal boundary quotient.

Abstract

In this paper we prove a general structure theorem for relatively hyperbolic groups (with arbitrary peripheral subgroups) acting naive convex co-compactly on properly convex domains in real projective space. We also establish a characterization of such groups in terms of the existence of an invariant collection of closed unbounded convex subsets with good isolation properties. This is a real projective analogue of results of Hindawi-Hruska-Kleiner for ${\rm CAT}(0)$ spaces. We also obtain an equivariant homeomorphism between the Bowditch boundary of the group and a quotient of the ideal boundary.