Intersecting Surface Defects and Instanton Partition Functions

Understand

We analyze intersecting surface defects inserted in interacting four-dimensional 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.