Hyperbolic quasi-geodesics in CAT(0) spaces

Abstract

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.

13 pages, 5 figures

References in corpus (1)

• Rough CAT(0) spaces

Cited by in corpus (1)

• Explicit equivalences between CAT(0) hyperbolic type geodesics