Rotation Vectors for Homeomorphisms of Non-Positively Curved Manifolds

Details Rotation Vectors for Homeomorphisms of Non-Positively Curved Manifolds Rotation Vectors for Homeomorphisms of Non-Positively Curved Manifolds

2009-12-30

arxiv.org/abs/1001.0053v4

Mathematics

Dynamical Systems

Scientific paper

Rotation vectors, as defined for homeomorphisms of the torus that are isotopic to the identity, are generalized to such homeomorphisms of any complete Riemannian manifold with non-positive sectional curvature. These generalized rotation vectors are shown to exist for almost every orbit of such a dynamical system with respect to any invariant measure with compact support. The concept is then extended to flows and, as an application, it is shown how non-null rotation vectors can be used to construct a measurable semi-conjugacy between a given flow and the geodesic flow of a manifold.

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