Meeting id 611 507 9832


초록: The Hofer-Zehnder capacity is the supremum of the Hofer norm over the admissible Hamiltonians. By a result of Lu, it is bounded by the symplectic area of a curve for a non-vanishing Gromov-Witten invariant with 2 point insertions. The purpose of the talk is to explain how to find such invariants using Hamiltonian circle actions. I will review a computation on the Seidel representation by McDuff and Tolman, and then use this to obtain the desired invariant.