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arXiv · 2610.41347

Cutoff for random Cayley graphs of finite groups

Haoran Zhu
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Abstract

We study the random walk on a Cayley graph of a finite group whose generators are chosen independently and uniformly at random. We show that, for every finite group, the walk exhibits cutoff with high probability whenever the number of generators is at least a constant multiple of the logarithm of the order of the group and small compared with every positive power of it. This holds for both undirected and directed Cayley graphs, in discrete and continuous time, and the lower bound on the number of generators is best possible, up to the value of the constant. The cutoff time is the time at which the expected entropy of the walk comes close to its maximum, and in general it depends on the structure of the group. This settles a conjecture of Aldous and Diaconis.

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Haoran Zhu. 2026-11-02. Cutoff for random Cayley graphs of finite groups. https://arxiv.org/abs/2610.41347

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