Intersecting surface defects and instanton partition functions

Journal of High Energy Physics, Jul 2017

We analyze intersecting surface defects inserted in interacting four-dimensional $\mathcal{N}=2$ supersymmetric quantum field theories. We employ the realization of a class of such systems as the infrared fixed points of renormalization group flows from larger theories, triggered by perturbed Seiberg-Witten monopole-like configurations, to compute their partition functions. These results are cast into the form of a partition function of 4d/2d/0d coupled systems. Our computations provide concrete expressions for the instanton partition function in the presence of intersecting defects and we study the corresponding ADHM model.

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Yiwen Pan, Wolfger Peelaers. Intersecting surface defects and instanton partition functions, Journal of High Energy Physics, 2017, 73, DOI: 10.1007/JHEP07(2017)073