Hyperbolic quasi-geodesics in CAT(0) spaces

Details Hyperbolic quasi-geodesics in CAT(0) spaces Hyperbolic quasi-geodesics in CAT(0) spaces

2011-12-19

arxiv.org/abs/1112.4246v1

Mathematics

Geometric Topology

13 pages, 5 figures

Scientific paper

We prove that in CAT(0) spaces a quasi-geodesic is Morse if and only if it is contracting. Specifically, in our main theorem we prove that for $\gamma$ a quasi-geodesic in a CAT(0) space X, the following four statements are equivalent: (i) $\gamma$ is Morse, (ii) $\gamma$ is (b,c)--contracting, (iii), $\gamma$ is strongly contracting, and (iv) in every asymptotic cone $X_{\omega},$ any two distinct points in the ultralimit $\gamma_{\omega}$ are separated by a cutpoint. As a corollary, we provide a converse to the usual Morse stability lemma in the CAT(0) setting. In addition, as a warm up we include an alternative proof of the fact that in CAT(0) spaces Morse quasi-geodesics have at least quadratic divergence, originally proven by Behrstock-Drutu.

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