Communications in Mathematical Physics

, Volume 352, Issue 3, pp 905–933 | Cite as

Dyson’s Spike for Random Schroedinger Operators and Novikov–Shubin Invariants of Groups

  • Marcin KotowskiEmail author
  • Bálint Virág


We study one dimensional Schroedinger operators with random edge weights and their expected spectral measures \({\mu_H}\) near zero. We prove that the measure exhibits a spike of the form \({\mu_H(-\varepsilon,\varepsilon) \sim \frac{C}{\mid{{\rm log}\varepsilon}\mid^2}}\) (first observed by Dyson), without assuming independence or any regularity of edge weights. We also identify the limiting local eigenvalue distribution, which is different from Poisson and the usual random matrix statistics. We then use the result to compute Novikov–Shubin invariants for various groups, including lamplighter groups and lattices in the Lie group Sol.


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© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.University of TorontoTorontoCanada

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