Random Schr\"odinger operators and convolution on wreath products

TL;DR

This paper establishes a spectral link between random Schr"odinger operators and convolution operators on wreath products, leading to new criteria for absolute continuity, Lifschitz tail estimates, and Green function moments.

Contribution

It generalizes previous results by connecting Schr"odinger operators with convolution operators on wreath products, providing new analytical tools and formulas.

Findings

Criterion for absolute continuity of convolutions on wreath products

Lifschitz tail estimates for Schr"odinger operators on Cayley graphs

Exact formula for the second moment of the Green function

Abstract

We establish a spectral correspondence between random Schr\"odinger operators and deterministic convolution operators on wreath products, generalizing previous results that relate Lamplighter groups to Schr\"odinger operators with Bernoulli potentials. Using this correspondence in both directions, we obtain an elementary criterion for the absolute continuity of convolutions on wreath products, Lifschitz tail estimates for Schr\"odinger operators on Cayley graphs of polynomial growth, and an exact formula for the second moment of the Green function, expressed in terms of the wreath product with an Abelian group of lamps.