Spectral gap and exponential mixing on geometrically finite hyperbolic manifolds

Abstract

Let M=Γ∖Hd+1 be a geometrically finite hyperbolic manifold with critical exponent exceeding d∕2. We obtain a precise asymptotic expansion of the matrix coefficients for the geodesic flow in L2(T1(M)), with exponential error term essentially as good as the one given by the spectral gap for the Laplace operator on L2(M) due to Lax and Phillips. Combined with the work of Bourgain, Gamburd, and Sarnak and its generalization by Golsefidy and Varjú on expanders, this implies uniform exponential mixing for congruence covers of M when Γ is a Zariski-dense subgroup contained in an arithmetic subgroup of SO∘(d,1).