Ergodicity and annular homeomorphisms of the torus

Details Ergodicity and annular homeomorphisms of the torus Ergodicity and annular homeomorphisms of the torus

2012-01-27

arxiv.org/abs/1201.5803v1

Mathematics

Dynamical Systems

10 pages

Scientific paper

Let $f: \mathbb{T}^2 \to \mathbb{T}^2$ be a homeomorphism homotopic to the identity and $F: \mathbb{R}^2 \to \mathbb{R}^2$ a lift of $f$ such that the rotation set $\rho(F)$ is a line segment of rational slope containing a point in $\mathbb{Q}^2$. We prove that if $f$ is ergodic with respect to the Lebesgue measure on the torus and the average rotation vector (with respect to same measure) does not belong to $\mathbb{Q}^2$ then some power of $f$ is an annular homeomorphism.

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