Entropy rigidity for cusped Hitchin representations

TL;DR

This paper proves an entropy rigidity theorem for Hitchin representations of geometrically finite Fuchsian groups, extending previous results and introducing new classes of groups and representations to unify various existing theories.

Contribution

It introduces (1,1,2)-hypertransverse groups and transverse representations, generalizing entropy and limit set results for a broader class of discrete groups.

Findings

Hausdorff dimension equals simple root entropy for (1,1,2)-hypertransverse groups

Generalization of entropy rigidity from closed surface groups to geometrically finite groups

Unified framework for studying limit sets and entropy in diverse group classes

Abstract

We establish an entropy rigidity theorem for Hitchin representations of all geometrically finite Fuchsian groups which generalizes a theorem of Potrie and Sambarino for Hitchin representations of closed surface groups. In the process, we introduce the class of (1,1,2)-hypertransverse groups and show for such a group that the Hausdorff dimension of its conical limit set agrees with its (first) simple root entropy, providing a common generalization of results of Bishop and Jones, for Kleinian groups, and Pozzetti, Sambarino and Wienhard, for Anosov groups. We also introduce the theory of transverse representations of projectively visible groups as a tool for studying discrete subgroups of linear groups which are not necessarily Anosov or relatively Anosov.