The Higher Rank Rigidity Theorem for Manifolds With No Focal Points

Details The Higher Rank Rigidity Theorem for Manifolds With No Focal Points The Higher Rank Rigidity Theorem for Manifolds With No Focal Points

2011-11-23

arxiv.org/abs/1111.5428v1

Mathematics

Differential Geometry

27 pages, 5 figures

Scientific paper

We say that a Riemannian manifold M has rank at least k if every geodesic in M admits at least k parallel Jacobi fields. The Rank Rigidity Theorem of Ballmann and Burns-Spatzier, later generalized by Eberlein-Heber, states that a complete, irreducible, simply connected Riemannian manifold M of rank at least 2 (the higher rank assumption), whose isometry group satisfies the condition that the recurrent vectors are dense in the unit tangent bundle SM (the duality condition), is a symmetric space of noncompact type. This includes, for example, higher rank M which admit a finite volume quotient. We adapt the method of Ballmann and Eberlein-Heber to prove a generalization of this theorem where the manifold M is assumed only to have no focal points. We then use this theorem to generalize to no focal points a result of Ballmann-Eberlein stating that for compact manifolds of nonpositive curvature, rank is an invariant of the fundamental group.

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