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C1-generic symplectic diffeomorphisms: partial hyperbolicity and zero centre Lyapunov exponents

Published online by Cambridge University Press:  26 March 2009

Jairo Bochi
Affiliation:
Departamento de Matemática, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente, 225, Rio de Janeiro, CEP 22453-900, Brazil ([email protected])

Abstract

We prove that if f is a C1-generic symplectic diffeomorphism then the Oseledets splitting along almost every orbit is either trivial or partially hyperbolic. In addition, if f is not Anosov then all the exponents in the centre bundle vanish. This establishes in full a result announced by Mañé at the International Congress of Mathematicians in 1983. The main technical novelty is a probabilistic method for the construction of perturbations, using random walks.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2010

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