Sigma models with local couplings: a new integrability -- RG flow connection

Ben Hoare, Nat Levine, Arkady A. Tseytlin

We consider several classes of $\sigma$-models (on groups and symmetric spaces, $\eta$-models, $\lambda$-models) with local couplings that may depend on the 2d coordinates, e.g. on time $\tau$. We…