High-degree Gromov-Thurston manifolds from the same or non-isometric GT-pairs are homotopy inequivalent when branching degrees are I-unrelated or have large prime factors.
On metric relative hyperbolicity
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abstract
We show the equivalence of several characterizations of relative hyperbolicity for metric spaces, and obtain extra information about geodesics in a relatively hyperbolic space. We apply this to characterize hyperbolically embedded subgroups in terms of nice actions on (relatively) hyperbolic spaces. We also study the divergence of (properly) relatively hyperbolic groups, in particular showing that it is at least exponential. Our main tool is the generalization of a result proved by Bowditch for hyperbolic spaces: if a family of paths in a space satisfies a list of properties specific to geodesics in a relatively hyperbolic space then the space is relatively hyperbolic and the paths are close to geodesics.
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Distinguishing Gromov-Thurston manifolds using algebraic Dehn fillings
High-degree Gromov-Thurston manifolds from the same or non-isometric GT-pairs are homotopy inequivalent when branching degrees are I-unrelated or have large prime factors.