Deformations of surface defect moduli spaces

Abstract

Given a 4d $\mathcal{N}=2$ supersymmetric theory with an $\mathcal{N}=(2,2)$ supersymmetric surface defect, a marginal perturbation of the bulk theory induces a complex structure deformation of the defect moduli space. We describe a concrete way of computing this deformation using the bulk-defect OPE.

24 pages