Growth of maps, distortion in groups and symplectic geometry

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In the present paper we study two sequences of real numbers associated to a symplectic diffeomorphism: • The uniform norm of the differential of its n-th iteration; • The word length of its n-th iteration, where we assume that our diffeomorphism lies in a finitely generated group of symplectic diffeomorphisms. We find lower bounds for the growth rates of these sequences in a number of situations. These bounds depend on the symplectic geometry of the manifold rather than on the specific choice of a diffeomorphism. They are obtained by using recent results of Schwarz on Floer homology. As an application, we prove non-existence of certain non-linear symplectic representations for finitely generated groups.

Original languageEnglish
Pages (from-to)655-686
Number of pages32
JournalInventiones Mathematicae
Issue number3
StatePublished - 2002


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