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Séminaire de Physique Théorique

# Surface defects and instanton-vortex interaction

## by Prof. Nikita SOPENKO (ITEP & IHES)

mardi 18 avril 2017 de au (Europe/Paris)
at IHES ( Amphithéâtre Léon Motchane )
35, route de Chartres, F-91440 Bures-sur-Yvette (France)
 Description I’ll present a general prescription for the 4d-2d partition function of half-BPS surface defects in d = 4, N = 2 gauge theories in Omega-background which is applicable for any surface defect obtained by gauging a 2d flavour symmetry using a 4d gauge group and reproduces known results obtained via the Higgsing procedure and Kanno-Tachikawa orbifold calculation for Gukov-Witten defects. The role of “negative vortices” which appear in the background of instantons will be emphasized. Organisé par Vasily PESTUN Contact Email: cecile@ihes.fr