Symmetric periodic Reeb orbits on the sphere

Abreu, Miguel; Liu, Hui; Macarini, Leonardo

doi:10.1090/tran/9216

Symmetric periodic Reeb orbits on the sphere
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by Miguel Abreu, Hui Liu and Leonardo Macarini;

Trans. Amer. Math. Soc. 377 (2024), 6751-6770

DOI: https://doi.org/10.1090/tran/9216

Published electronically: July 16, 2024

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Abstract:

A long standing conjecture in Hamiltonian Dynamics states that every contact form on the standard contact sphere $S^{2n+1}$ has at least $n+1$ simple periodic Reeb orbits. In this work, we consider a refinement of this problem when the contact form has a suitable symmetry and we ask if there are at least $n+1$ simple symmetric periodic orbits. We show that there is at least one symmetric periodic orbit for any contact form and at least two symmetric closed orbits whenever the contact form is dynamically convex.

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