Monday, February 22 2021
16:00 - 17:30

IMSc Webinar

Synopsis Meeting: Surface Defects from Fractional Branes

Sujoy Mahato


We show that the Gukov-Witten type monodromy defects of N=4 supersymmetric Yang-Mills theory in four dimensions can be realized in perturbative Type II B string theory by considering an orbifold background of the Kanno-Tachikawa type and placing stacks of fractional D3-branes whose world-volume extends partially along the orbifold directions. In particular, we show that turning on a constant background value for some scalar fields in the closed string twisted sectors induces a non-trivial profile for the gauge field and one of the complex scalars of the world-volume theory, and that this profile exactly matches the singular behaviour that one expects for a Gukov-Witten surface defect in the N = 4 super Yang-Mills theory. We also give evidence for our proposal by showing consistency of S-duality properties of the continuous parameters defining the defect.
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