A Law of Iterated Logarithm on Lamplighter Diagonal Products

Abstract

We prove a Law of Iterated Logarithm for random walks on a family of diagonal products constructed by Brieussel and Zheng (2021). This provides a wide variety of new examples of Law of Iterated Logarithm behaviours for random walks on groups. In particular, it follows that for any $\frac{1}{2}\le \beta \le 1$ there is a group $G$ and random walk $W_n$ on $G$ with $\mathbb{E}|W_n|\simeq n^{\beta }$ such that $$0<\mathrm{limsup}\frac{|W_n|}{n^{\beta }(\log \log n{)}^{1-\beta }}<\infty$$ and $$0<\mathrm{liminf}\frac{|W_n|(\log \log n{)}^{1-\beta }}{n^{\beta }}<\infty .$$

39 pages