Cutoff for geodesic paths on hyperbolic manifolds

Abstract

We establish new instances of the cutoff phenomenon for geodesic paths and for the Brownian motion on compact hyperbolic manifolds. We prove that for any fixed compact hyperbolic manifold, the geodesic path started on a spatially localized initial condition exhibits cutoff. Our work also extends results obtained by Golubev and Kamber on hyperbolic surfaces of large volume to any dimension. Our proof builds upon a spectral strategy introduced by Lubetzky and Peres for Ramanujan graphs and on a detailed spectral analysis of the spherical mean operator.

30 pages. Post-publication corrected version: in Proposition 2.3, the constant c_d is corrected by removal of a factor 1/2. Otherwise the manuscript agrees with the published paper