Persistence probabilities of fractional Lévy fields indexed by hyperbolic space and other Riemannian manifolds

Abstract: We study the persistence probability of fractional Lévy fields, i.e. the analogue of fractional Brownian motion with generalised (multi-dimensional) index sets. First, we compute the persistence exponent of the hyperbolic fractional Lévy field. The result matches the rate obtained in Molchan (1999) for Euclidean space and the one in Aurzada/Helmer (2026) for the sphere. This enables us to study persistence for fractional Lévy fields indexed by a large class of Riemannian manifolds (whenever that process exists) through a local comparison argument with the spherical and hyperbolic case.