Symplectic Dynamics/Geometry Seminar

Topic: Local rigidity and C^0 symplectic and contact topology

Speaker: Mike Usher

Affiliation: University of Georgia

Date & Time: Monday November 11th, 2019, 3:30pm - 4:30pm

Location: Simonyi Hall 101


I will explain how coisotropic submanifolds of symplectic manifolds can be distinguished among all submanifolds by a criterion ("local rigidity") related to the Hofer energy necessary to disjoin open sets from them. This criterion is invariant under symplectic homeomorphisms, leading to a simplified proof of the Humiliere-Leclercq-Seyfaddini theorem that a symplectic-homeomorphic image of a coisotropic submanifold that is smooth is coisotropic. Moreover much of this picture extends to the contact context, allowing one to extend the class of C^0-limits of contactomorphisms which are known to map Legendrian submanifolds to Legendrian submanifolds.