Jan 22, 2024
Expected hitting time estimates on finite graphs
Vienna Probability Seminar
Date: January 22, 2024 |
5:00 pm –
6:00 pm
Speaker:
Yuwen Wang , Universität Innsbruck
Location: Mondi 2 (I01.01.008), Central Building
Language:
English
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 talk, we shall discuss 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 using a formula in terms of the volumes of balls around b. We give an outline of the proof using Green functions and heat kernel estimates. Using this result, we can then estimate H(a,b) on various graphs, such as rectangular tori, some convex traces on the integer lattice, and fractal graphs.
Joint work with Laurent Saloff-Coste.
