Ribbon categories from ind-exact algebras: simple current case

Abstract

We give criteria for when finitely generated local modules over a commutative algebra $A$ in the ind-completion $\hat{\mathcal{C}}$ of a braided tensor category $\mathcal{C}$ inherit the structure of a (rigid, braided, ribbon) tensor category. We then apply this to simple current algebras $A={⨁}_{g\in \hat{I}“}{E}_g$, where $\hat{I}“$ is a subgroup of invertible objects in $\mathcal{C}$. Using a description of simple $A$-modules, we verify the required hypotheses for this class of algebras and deduce rigidity, braided, ribbon, and non-degeneracy properties for their finitely generated local modules. As applications, we construct examples of ribbon tensor categories from quantum supergroup categories for unrolled $\mathfrak{gl}(1|1)$.

v1: 50 pages. Comments welcome