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arXiv · 1604.06516

The centralizer of Komuro-expansive flows and expansive R^d-actions

Wescley Bonomo·Jorge Rocha·Paulo Varandas
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Abstract

In this paper we study the centralizer of flows and $\mathbb R^d$-actions on compact Riemannian manifolds. We prove that the centralizer of every $C^\infty$ Komuro-expansive flow with non-ressonant singularities is trivial, meaning it is the smallest possible, and deduce there exists an open and dense subset of geometric Lorenz attractors with trivial centralizer. We show that $\mathbb R^d$-actions obtained as suspension of $\mathbb Z^d$-actions are expansive if and only if the same holds for the $\mathbb Z^d$-actions. We also show that homogeneous expansive $\mathbb R^d$-actions have quasi-trivial centralizers, meaning that it consists of orbit invariant, continuous linear reparametrizations of the $\mathbb R^d$-action. In particular, homogeneous Anosov $\mathbb R^d$-actions have quasi-trivial centralizer.

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Wescley Bonomo, Jorge Rocha, Paulo Varandas. 2016-04-22. The centralizer of Komuro-expansive flows and expansive R^d-actions. https://arxiv.org/abs/1604.06516

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