|Date: Thursday, November 18, 2021
Location: 3866 East Hall (3:00 PM to 4:00 PM)
Title: Probing homotopy 4-spheres using "nearly" symplectic geometry
Abstract: Most closed 4-manifolds don't admit symplectic forms, but they admit "near-symplectic" 2-forms that are symplectic away from some circles. I will introduce them to probe homotopy 4-spheres, by counting certain Riemann surfaces in the complement of these circles. The dream is that these will be sensitive enough to distinguish potentially exotic 4-spheres... but maybe it's a nightmare.
Speaker: Chris Gerig
Institution: SCGP, Stony Brook
Event Organizer: Linh Truong