Entropy Rigidity for Maximal Representations

Abstract

Let $\hat{I}“\subset \mathsf{PSL}(2,\mathbb{R})$ be a lattice and $\ddot{I}:\hat{I}“\to \mathsf{Sp}(2n,\mathbb{R})$ be a maximal representation. We show that $\ddot{I}$ satisfies a measurable $(1,1,2)-$hypertransversality condition. With this we define a measurable Gromov product and the Bowen-Margulis-Sullivan measure associated to the unstable Jacobian introduced by Pozzetti, Sambarino and Wienhard. As a main application, we prove a strong entropy rigidity result for $\ddot{I}$.

43 pages