On the Flux Conjectures
Francois Lalonde, Dusa McDuff, Leonid Polterovich
Abstract
The ``Flux conjecture'' for symplectic manifolds states that the group of Hamiltonian diffeomorphisms is C1-closed in the group of all symplectic diffeomorphisms. We prove the conjecture for spherically rational manifolds and for those whose minimal Chern number on 2-spheres either vanishes or is large enough. We also confirm a natural version of the Flux conjecture for symplectic torus actions. In some cases we can go further and prove that the group of Hamiltonian diffeomorphisms is C0-closed in the identity component of the group of all symplectic diffeomorphisms.
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