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Area-preserving diffeomorphisms of the torus whose rotation sets have non-empty interior

Published online by Cambridge University Press:  13 August 2013

SALVADOR ADDAS-ZANATA*
Affiliation:
Instituto de Matemática e Estatística, Universidade de São Paulo, Rua do Matão 1010, Cidade Universitária, 05508-090 São Paulo, SP, Brazil email [email protected]

Abstract

In this paper we consider ${C}^{1+ \epsilon } $ area-preserving diffeomorphisms of the torus $f$, either homotopic to the identity or to Dehn twists. We suppose that $f$ has a lift $\widetilde {f} $ to the plane such that its rotation set has interior and prove, among other things, that if zero is an interior point of the rotation set, then there exists a hyperbolic $\widetilde {f} $-periodic point $\widetilde {Q} \in { \mathbb{R} }^{2} $ such that ${W}^{u} (\widetilde {Q} )$ intersects ${W}^{s} (\widetilde {Q} + (a, b))$ for all integers $(a, b)$, which implies that $ \overline{{W}^{u} (\widetilde {Q} )} $ is invariant under integer translations. Moreover, $ \overline{{W}^{u} (\widetilde {Q} )} = \overline{{W}^{s} (\widetilde {Q} )} $ and $\widetilde {f} $ restricted to $ \overline{{W}^{u} (\widetilde {Q} )} $ is invariant and topologically mixing. Each connected component of the complement of $ \overline{{W}^{u} (\widetilde {Q} )} $ is a disk with diameter uniformly bounded from above. If $f$ is transitive, then $ \overline{{W}^{u} (\widetilde {Q} )} = { \mathbb{R} }^{2} $ and $\widetilde {f} $ is topologically mixing in the whole plane.

Type
Research Article
Copyright
© Cambridge University Press, 2013 

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