Counting and boundary limit theorems for representations of Gromov-hyperbolic groups

Abstract

Given a Gromov-hyperbolic group G endowed with a finite symmetric generating set, we study the statistics of counting measures on the spheres of the associated Cayley graph under linear representations of G. More generally, we obtain a weak law of large numbers for subadditive functions, echoing the classical Fekete lemma. For strongly irreducible and proximal representations, we prove a counting central limit theorem with a Berry-Esseen type error rate and exponential large deviation estimates. Moreover, in the same setting, we show convergence of interpolated normalized matrix norms along geodesic rays to Brownian motion and a functional law of iterated logarithm, paralleling the analogous results in the theory of random matrix products. Our counting large deviation estimates provide a positive answer to a question of Kaimanovich-Kapovich-Schupp. In most cases, our counting limit theorems will be obtained from stronger almost sure limit laws for Patterson-Sullivan measures on the boundary of the group.Contents 42 9. On a question of Kaimanovich-Kapovich-Schupp 47 References 49