Tightness conjecture for nowhere Reeb-invariant compatible metrics

Let (M,ξ)(M,\xi) be a contact 3-manifold. Let XαX_\alpha be a Reeb vector field and JJ a complex structure on the contact distribution, and let θ\theta' denote the instantaneous rotation of a compatible metric. Tightness conjecture. If

LXαJ0\mathcal{L}_{X_\alpha}J\neq 0

everywhere, equivalently if there is a compatible metric with

Ricci(Xα)<θ22Ricci(X_\alpha)<\frac{\theta'^2}{2}

everywhere, then (M,ξ)(M,\xi) is tight. The conjecture proposes a contact-topological obstruction to globally realizing this curvature and Reeb-dynamical behavior, and is presented as a generalization of earlier results on conformally Anosov contact 3-manifolds.

Sources & referencesView supporting material

Primary source

Surena Hozoori, “Ricci Curvature, Reeb Flows and Contact 3-Manifolds”, arXiv:1911.11109 (2019).

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