Daniel Ruberman (Brandeis)

Title: Applications of Heegaard-Floer theory to link concordance

Abstract: Invariants derived from Heegaard-Floer theory have proved to  
be very powerful in investigating smooth knot concordance. I will  
discuss some applications of these invariants, especially the so- 
called correction term (or d-invariant) to problems of link  
concordance.  For example, answering a question of Jim Davis, I will  
describe links with trivial (two-variable) Alexander polynomial and  
unknotted components that are not concordant to the Hopf link.