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arXiv · 2601.14842

Contactomorphic vertically convex domains

Jan Eyll·Jonas Fritsch·Kai Zehmisch
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Abstract

We consider the standard Darboux space equipped with the radial symmetric contact form. We study co-orientation preserving contactomorphisms between relatively compact domains up to the boundary. We determine the contactomorphism classes among all strict vertically convex domains over a round ball in the Liouville hyperplane that are radially symmetric about the Reeb axis and whose boundary coincide along a neighbourhood of the common equator. The total invariant is the mean curvature of the bounding sphere at the umbilic points with the same sign. Replacing the Liouville hyperplane by codisc bundles of closed non-Besse Riemannian manifolds or finite symplectisations of closed non-Besse strict contact manifolds analogous results are formulated in terms of characteristic length and total characteristic action, resp.

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Jan Eyll, Jonas Fritsch, Kai Zehmisch. 2026-01-21. Contactomorphic vertically convex domains. https://arxiv.org/abs/2601.14842

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