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SUMMARY:Naturality of Heegaard Floer homology - Andras Juhasz\, Imperial C
 ollege
DTSTART:20121128T160000Z
DTEND:20121128T170000Z
UID:TALK39961@talks.cam.ac.uk
CONTACT:Ivan Smith
DESCRIPTION:Previously\, the Heegaard Floer invariants of 3-manifolds and 
 links have only been defined up to isomorphism. This suffices for many app
 lications\, but to be able to talk about diffeomorphism or cobordism maps 
 on such groups one needs a functorial construction. We will provide the mi
 ssing ingredient for functoriality\, and define the action of the based ma
 pping class group. Our approach relies on the bifurcation analysis of 2-pa
 rameter families of gradient vector fields. This is joint work with Dylan 
 Thurston and Peter Ozsváth.
LOCATION:MR13
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