Integrable Kondo problems

14 Mar 2020 · Gaiotto Davide, Lee Ji Hoon, Wu Jingxiang ·

We discuss the integrability and wall-crossing properties of chiral Kondo problems, where an 1d impurity is coupled to a 2d chiral CFT and triggers a defect RG flow. We review several new and old examples inspired by constructions in four-dimensional Chern-Simons theory and by affine Gaudin models.