Spectra and joint dynamics of Poisson suspensions for rank-one automorphisms

Valery V. Ryzhikov

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arXiv · 2411.02024

Spectra and joint dynamics of Poisson suspensions for rank-one automorphisms

Valery V. Ryzhikov

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Abstract

For every natural $n>1$, there is an operator $T$ of dynamical origin such that its tensor power $T^{\otimes n}$ has singular spectrum, and $T^{\otimes (n+1)}$ has absolutely continuous one. For a set $D$ of positive measure there are mixing zero entropy automorphisms $S,T$ such that $S^nD\cap T^nD=\varnothing$ for all $n>0$. The following answers, in particular, Frantzikinakis-Host's question. If $ p(n+1)- p(n), \ \ q(n+1)- q(n)\ \to\ +\infty$, then there is a divergent sequence $ \sum_{n=1}^{N} \mu(S^{ p(n)}C\cap T^{ q(n)}C)/N$ for some set $C$ and automorphisms $S,T$ of simple singular spectrum.

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BibTeX RIS

Valery V. Ryzhikov. 2024-11-04. Spectra and joint dynamics of Poisson suspensions for rank-one automorphisms. https://arxiv.org/abs/2411.02024

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