Expected hitting time estimates on finite graphs

Laurent Saloff-Coste; Yuwen Wang

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arXiv · 2312.01803

Expected hitting time estimates on finite graphs

Laurent Saloff-Coste·Yuwen Wang

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Abstract

The expected hitting time from vertex $a$ to vertex $b$, $H(a,b)$, is the expected value of the time it takes a random walk starting at $a$ to reach $b$. In this paper, we give estimates for $H(a,b)$ when the distance between $a$ and $b$ is comparable to the diameter of the graph, and the graph satisfies a Harnack condition. We show that, in such cases, $H(a,b)$ can be estimated in terms of the volumes of balls around $b$. Using our results, we estimate $H(a,b)$ on various graphs, such as rectangular tori, some convex traces in $\mathbb{Z}^d$, and fractal graphs. Our proofs use heat kernel estimates.

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BibTeX RIS

Laurent Saloff-Coste, Yuwen Wang. 2023-12-04. Expected hitting time estimates on finite graphs. https://arxiv.org/abs/2312.01803

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