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October  2008, 2(4): 719-740. doi: 10.3934/jmd.2008.2.719

2-Frame flow dynamics and hyperbolic rank-rigidity in nonpositive curvature

David Constantine 1,

1. 

Department of Mathematics,University of Michigan, Ann Arbor,MI 48109, United States

Received  May 2008 Revised  September 2008 Published  October 2008

This paper presents hyperbolic rank-rigidity results for nonpositively curved spaces of rank 1. Let $M$ be a compact, rank-1 manifold with nonpositive sectional curvature and suppose that along every geodesic in $M$ there is a parallel vector field making curvature $-a^2$ with the geodesic direction. We prove that $M$ has constant curvature equal to $-a^2$ if $M$ is odd-dimensional or if $M$ is even-dimensional and has sectional curvature pinched as follows: $-\Lambda^2 < K < -\lambda^2$ where $\lambda/\Lambda >.93$. When $-a^2$ is the upper curvature bound this gives a shorter proof of the hyperbolic rank-rigidity theorem of Hamenstädt, subject to the pinching condition in even dimension; in all other cases it is a new result. We also present a rigidity result using only an assumption on maximal Lyapunov exponents in direct analogy with work done by Connell. The proof uses the dynamics of the frame flow, developed by Brin for negatively curved manifolds; portions of his work are adapted here for use in the nonpositively curved, rank-1 situation.
Keywords: Rank-rigidity, frame flow, hyperbolic rank.
Mathematics Subject Classification: Primary: 53C24, 53C35; Secondary: 37D40.
Citation: David Constantine. 2-Frame flow dynamics and hyperbolic rank-rigidity in nonpositive curvature. Journal of Modern Dynamics, 2008, 2 (4) : 719-740. doi: 10.3934/jmd.2008.2.719
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