We classify a "dense open" subset of categories with an action of a reductive group, which we call nondegenerate categories, entirely in terms of the root datum of the group. As an application of our methods, we also: (1) Upgrade an equivalence of Ginzburg and Lonergan, which identifies the category of bi-Whittaker $\mathcal{ D}$-modules on a reductive group with the category of $\tilde{ W}$-equivariant sheaves on a dual Cartan subalgebra $\mathfrak{ t}^*$ which descend to the coarse quotient $\mathfrak{ t}^*//\tilde{ W}$, to a monoidal equivalence (where $\tilde{ W}$ denotes the extended affine Weyl group) and (2) Show the parabolic restriction of a very central sheaf acquires a Weyl group equivariant structure such that the associated equivariant sheaf descends to the coarse quotient $\mathfrak{ t}^*//\tilde{ W}$, providing evidence for a conjecture of Ben-Zvi-Gunningham on parabolic restriction.
Categories: math.RT math.AG math.CT