Positive topological entropy of Reeb flows on spherizations

Details Positive topological entropy of Reeb flows on spherizations Positive topological entropy of Reeb flows on spherizations

2010-08-26

arxiv.org/abs/1008.4566v1

Mathematics

Dynamical Systems

29 pages, 3 figures

Scientific paper

Let M be a closed manifold whose based loop space is ``complicated''. Examples are rationally hyperbolic manifolds and manifolds whose fundamental group has exponential growth. We prove that the topological entropy of any Reeb flow on the spherization of T*M is positive. Moreover, given q in M, for almost every q' in M the number of Reeb orbits from the fiber over q to the fiber over q' grows exponentially in time. If M is a surface of higher genus, we also obtain exponential growth of the number of closed Reeb orbits.

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