The rate of decay of the Wiener sausage in local Dirichlet space

TL;DR

This paper investigates the asymptotic decay rate of the Wiener sausage in local Dirichlet spaces with Gaussian heat kernel estimates, extending known Euclidean results to more general geometric contexts.

Contribution

It establishes the first asymptotic results for Wiener sausage decay in local Dirichlet spaces, including Riemannian manifolds with non-negative Ricci curvature.

Findings

Asymptotic behavior of negative exponential moments matches Euclidean case

Extension of results to diffusions on Riemannian manifolds

Use of coarse graining technique adapted for non-translation-invariant settings

Abstract

In the context of a heat kernel diffusion which admits a Gaussian type estimate with parameter beta on a local Dirichlet space, we consider the log asymptotic behavior of the negative exponential moments of the Wiener sausage. We show that the log asymptotic behavior up to time t^{beta}V(x,t) is V(x,t), which is analogous to the Euclidean result. Here V(x,t) represents the mass of the ball of radius t about a point x of the local Dirichlet space. The proof uses a known coarse graining technique to obtain the upper asymptotic, but must be adapted to for use without translation invariance in this setting. This result provides the first such asymptotics for several other contexts, including diffusions on complete Riemannian manifolds with non-negative Ricci curvature.