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SUMMARY:The motivic Donaldson-Thomas invariants of fat points - Davison \,
  B (Oxford)
DTSTART:20110406T153000Z
DTEND:20110406T163000Z
UID:TALK30565@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Recent work of Behrend\, Bryan and Szendroi gives a nice handl
 e on the degree zero motivic Donaldson-Thomas invariants of threefolds\, i
 n which the calculation of the invariants of a single point in smooth thre
 e dimensional space plays the key role. I will explain how fat points fit 
 naturally into the theory of 3-Calabi-Yau categories\, and also what kind 
 of contributions they make. In contrast with the smooth case\, the story h
 ere throws up complicated motives and monodromy actions\, and it is possib
 le to see directly here the role played by the concept of orientation data
 .\n\n
LOCATION:Seminar Room 1\, Newton Institute
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