The Weinstein conjecture for stable Hamiltonian structures

Details The Weinstein conjecture for stable Hamiltonian structures The Weinstein conjecture for stable Hamiltonian structures

2008-08-31

arxiv.org/abs/0809.0140v1

Mathematics

Symplectic Geometry

39 pages

Scientific paper

We use the equivalence between embedded contact homology and Seiberg-Witten Floer homology to obtain the following improvements on the Weinstein conjecture. Let Y be a closed oriented connected 3-manifold with a stable Hamiltonian structure, and let R denote the associated Reeb vector field on Y. We prove that if Y is not a T^2-bundle over S^1, then R has a closed orbit. Along the way we prove that if Y is a closed oriented connected 3-manifold with a contact form such that all Reeb orbits are nondegenerate and elliptic, then Y is a lens space. Related arguments show that if Y is a closed oriented 3-manifold with a contact form such that all Reeb orbits are nondegenerate, and if Y is not a lens space, then there exist at least three distinct embedded Reeb orbits.

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