Morse quasi-geodesics behave locally-to-globally in mapping class groups, CAT(0) groups, 3-manifold groups, and relatively hyperbolic groups, giving new combination theorems for stable subgroups.
Regular Languages for Contracting Geodesics
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abstract
Let $G$ be a finitely generated group. We show that for any finite generating set $A$, the language consisting of all geodesics in $Cay(G,A)$ with a contracting property is a regular language. As an application, we show that any finitely generated group containing an infinite contracting geodesic must be either virtually $\mathbb{Z}$ or acylindrically hyperbolic.
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2019 1verdicts
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The local-to-global property for Morse quasi-geodesics
Morse quasi-geodesics behave locally-to-globally in mapping class groups, CAT(0) groups, 3-manifold groups, and relatively hyperbolic groups, giving new combination theorems for stable subgroups.