Events Calendar
Sign Up

Free Event

Michael Willis (UCLA)

Title: Generalizing Rasmussen's s-invariant, and applications

Abstract: I will discuss a method to define Khovanov and Lee homology for links in connected sums of copies of S1 times S2.  From here we can define an s-invariant that gives genus bounds on oriented cobordisms between links.  I will discuss some applications to surfaces in certain 4-manifolds, including a proof that the s-invariant cannot detect exotic 4-balls coming from Gluck twists of the standard 4-ball.  If time allows, I will also discuss our new combinatorial proof of the slice Bennequin inequality in S1 times S2.  All of this is joint work with Ciprian Manolescu, Marco Marengon, and Sucharit Sarkar.

Event Details

See Who Is Interested

0 people are interested in this event