Seminar Event Detail


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   


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