Length minimizing Hamiltonian paths for symplectically aspherical manifolds

Details Length minimizing Hamiltonian paths for symplectically aspherical manifolds Length minimizing Hamiltonian paths for symplectically aspherical manifolds

2002-06-21

arxiv.org/abs/math/0206220v2

Mathematics

Symplectic Geometry

23 pages, references added and final revisions made for publication

Scientific paper

In this paper we consider the length minimizing properties of Hamiltonian paths generated by quasi-autonomous Hamiltonians on symplectically aspherical manifolds. Motivated by the work of L. Polterovich and M. Schwarz, we study the role of the fixed global extrema in the Floer complex of the generating Hamiltonian. Our main result determines a natural condition on a fixed global maximum of a Hamiltonian which implies that the corresponding path minimizes the positive Hofer length. We use this to prove that a quasi-autonomous Hamiltonian generates a length minimizing path if it has under-twisted fixed global extrema and no periodic orbits with period one and action greater than the fixed extrema. This, in turn, allows us to produce new examples of autonomous Hamiltonian flows which are length minimizing for all times. These constructions are based on the geometry of coisotropic submanifolds. Finally, we give a new proof of the recent theorem of D. McDuff which states that quasi-autonomous Hamiltonians generate length minimizing paths over short time intervals.

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