# Flow invariant subsets for geodesic flows of manifolds with non-positive curvature

Reinold, B (2004). Flow invariant subsets for geodesic flows of manifolds with non-positive curvature. Ergodic Theory and Dynamical Systems, 24(6):1981-1990.

## Abstract

Consider a closed, smooth manifold M of non-positive curvature. Write p:UM→M for the unit tangent bundle over M and let ℛ > denote the subset consisting of all vectors of higher rank. This subset is closed and invariant under the geodesic flow φ on UM. We define the structured dimension s-dim ℛ > which, essentially, is the dimension of the set p(ℛ > ) of base points of ℛ > .
The main result of this paper holds for manifolds with s-dim ℛ > <dim M/2: for every ε>0, there is an ε-dense, flow invariant, closed subset Ξ ε ⊂UM∖ℛ > such that p(Ξ ε )=M.

Consider a closed, smooth manifold M of non-positive curvature. Write p:UM→M for the unit tangent bundle over M and let ℛ > denote the subset consisting of all vectors of higher rank. This subset is closed and invariant under the geodesic flow φ on UM. We define the structured dimension s-dim ℛ > which, essentially, is the dimension of the set p(ℛ > ) of base points of ℛ > .
The main result of this paper holds for manifolds with s-dim ℛ > <dim M/2: for every ε>0, there is an ε-dense, flow invariant, closed subset Ξ ε ⊂UM∖ℛ > such that p(Ξ ε )=M.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Institute of Mathematics 510 Mathematics English 2004 29 Nov 2010 16:26 05 Apr 2016 13:24 Cambridge University Press 0143-3857 Copyright © 2004 Cambridge University Press https://doi.org/10.1017/S0143385704000197 http://www.ams.org/mathscinet-getitem?mr=2106774http://www.zentralblatt-math.org/zbmath/search/?q=an%3A1127.53070
Permanent URL: https://doi.org/10.5167/uzh-21817