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arXiv · 2110.15646

On the spectral theory of groups of automorphisms of $S$-adic nilmanifolds

Bachir Bekka·Yves Guivarc'h
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Abstract

Let $S=\{p_1, \dots, p_r,\infty\}$ for prime integers $p_1, \dots, p_r.$ Let $X$ be an $S$-adic compact nilmanifold, equipped with the unique translation invariant probability measure $\mu.$ We characterize the countable groups $\Gamma$ of automorphisms of $X$ for which the Koopman representation $\kappa$ on $L^2(X,\mu)$ has a spectral gap. More specifically, we show that $\kappa$ does not have a spectral gap if and only if there exists a non-trivial $\Gamma$-invariant quotient solenoid (that is, a finite-dimensional, connected, compact abelian group) on which $\Gamma$ acts as a virtually abelian group.

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Bachir Bekka, Yves Guivarc'h. 2021-10-29. On the spectral theory of groups of automorphisms of $S$-adic nilmanifolds. https://arxiv.org/abs/2110.15646

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