Speaker:	Daniel Krefl (IPMU)
Title:	Instanton counting in Omega background and beyond
Date (JST):	Mon, Sep 13, 2010, 13:30 - 17:00
Place:	Seminar Room A
Abstract:	I will give a (more or less) pedagogical introduction into instanton counting in Omega background, which is a topic of current mathematical (cf. work of Nakajima et al., etc. ) and physical (due to its occurance in the context of AGT conjecture, relation to refined BPS state counting, etc.) interest. Especially, I will report on some results (cf. arXiv:1007.0263) obtained in collaboration with J. Walcher about the underlying (anti-)holomorphic structure of N=2 partition functions in the Omega background. As main examples I will discuss SU(2) gauge theory with and without flavors, however, trivially the results extend to every N=2 system which fits into a special geometry framework, especially local Calabi-Yau backgrounds. I will also discuss a surprising relation to orientifolds. The first half of the talk (~1h) is devoted to introduce the necessary background material. The talk will be powerpoint based.
Seminar Video:	[VIDEO]
Remarks:	There will be a tea break around 15:00-15:30

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