Random Lie bracket on $\mathfrak{sl}_2(\mathbf{F}_p)$

Urban Jezernik; Matevž Miščič

Paper

Random Lie bracket on $\mathfrak{sl}_2(\mathbf{F}_p)$

Abstract

We study a random walk on the Lie algebra

where new elements are produced by randomly applying adjoint operators of two generators. Focusing on the generic case where the generators are selected at random, we analyze the limiting distribution of the random walk and the speed at which it converges to this distribution. These questions reduce to the study of a random walk on a cyclic group. We show that, with high probability, the walk exhibits a pre-cutoff phenomenon after roughly

steps. Notably, the limiting distribution need not be uniform and it depends on the prime divisors of

. Furthermore, we prove that by incorporating a simple random twist into the walk, we can embed a well-known affine random walk on

into the modified random Lie bracket, allowing us to show that the entire Lie algebra is covered in roughly

steps in the generic case.