Every residually finite hyperbolic group, and every curve graph of a finite-type surface, admits globally stable cylinders.
Property (QT) for 3-manifold groups
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abstract
According to Bestvina-Bromberg-Fujiwara, a finitely generated group is said to have property (QT) if it acts isometrically on a finite product of quasi-trees so that orbital maps are quasi-isometric embeddings. We prove that the fundamental group $\pi_1(M)$ of a compact, connected, orientable 3-manifold $M$ has property (QT) if and only if no summand in the sphere-disc decomposition of $M$ supports either Sol or Nil geometry. In particular, all compact, orientable, irreducible 3-manifold groups with nontrivial torus decomposition and not supporting Sol geometry have property (QT). In the course of our study, we establish property (QT) for the class of Croke-Kleiner admissible groups and of relatively hyperbolic groups under natural assumptions has property (QT).
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math.GT 1years
2025 1verdicts
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Stable cylinders and fine structures for hyperbolic groups and curve graphs
Every residually finite hyperbolic group, and every curve graph of a finite-type surface, admits globally stable cylinders.