(HoRSe seminar) Joyce-Song wall-crossing as an asymptotic expansion I

(HoRSe seminar) Joyce-Song wall-crossing as an asymptotic expansion I

Tue, 06/03/2012
14:00 		Jacopo Stoppa (Cambridge) Algebraic and Symplectic Geometry Seminar Add to calendar SR1
(HoRSe seminar) Joyce-Song wall-crossing as an asymptotic expansion I
Joyce and Song expressed the wall-crossing behaviour of Donaldson-Thomas invariants using a sum over graphs. Joyce expected that these would have something to do with the Feynman diagrams of suitable physical theories. I will show how this can be achieved in the framework for wall-crossing proposed by Gaiotto, Moore and Neitzke. JS diagrams emerge from small corrections to a hyperkahler metric. The basics of GMN theory will be explained during the first talk.