BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:On the Calculus underlying Donaldson-Thomas theory - Behrend\, KB 
 (University of British Columbia)
DTSTART:20110127T153000Z
DTEND:20110127T163000Z
UID:TALK29658@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:On a manifold there is the graded algebra of polyvector fields
  with its Lie-Schouten bracket\, and the module of de Rham differentials w
 ith exteriour differentiation.  This package is called a "calculus".  The 
 moduli space of sheaves (or derived category objects) on a Calabi-Yau thre
 efold has a kind of "virtual calculus" on it.  In particular\, this moduli
  space has virtual de Rham cohomology groups\, which categorify Donaldson-
 Thomas invariants\, at least conjecturally.  We describe some attempts at 
 constructing such a virtual calculus. This is work in progress.\n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR