Long time behavior of the volume of the Wiener sausage on Dirichlet spaces

TL;DR

This paper investigates the long-term growth and fluctuation behaviors of the Wiener sausage volume on various Dirichlet spaces, extending classical Euclidean results to more general metric measure spaces.

Contribution

It provides the first detailed analysis of Wiener sausage volume growth on Dirichlet spaces with Ahlfors regularity and sub-Gaussian heat kernel estimates, including new fluctuation examples.

Findings

Growth rate of expectations matches Euclidean case on bounded modifications.

Almost sure behaviors are characterized under specific geometric and analytic conditions.

An example of fluctuating scaled means is constructed.

Abstract

In the present paper, we consider long time behaviors of the volume of the Wiener sausage on Dirichlet spaces. We focus on the volume of the Wiener sausage for diffusion processes on metric measure spaces other than the Euclid space equipped with the Lebesgue measure. We obtain the growth rate of the expectations and almost sure behaviors of the volumes of the Wiener sausages on metric measure Dirichlet spaces satisfying Ahlfors regularity and sub-Gaussian heat kernel estimates. We show that the growth rate of the expectations on a "bounded" modification of the Euclidian space is identical with the one on the Euclidian space equipped with the Lebesgue measure. We give an example of a metric measure Dirichlet space on which a scaled of the means fluctuates.