Date: 
May 8 (Thu), 2008, 15:30  17:30 
Place: 
Room 630, 6th floor, Research Centers Building, Kashiwa Campus of the University of Tokyo. 
Speaker: 
Yukinobu Toda (IPMU) 
Title: 
Limit stable objects on CalabiYau 3folds. 
Abstract: 
The purpose of this talk is to introduce the notion of
limit stability on the category of perverse coherent sheaves
on CalabiYau 3folds, and construct new enumerative invariants
of curves via limit stable objects. I will show that such invariants
are generalizations of stable pair invariants introduced by
Pandharipande
and Thomas. I will also propose a conjectual wallcrossing formula of
our new invariants, and show that such a formula will solve the
rationality conjecture of the generating functions of stable pair
invariants.
