Abstract
We construct a categorification of parabolic Verma modules for symmetrizable Kac–Moody algebras using KLR-like diagrammatic algebras.
We show that our construction arises naturally from a dg-enhancement of the cyclotomic quotients of the KLR-algebras.
As a consequence, we are able to recover the usual categorification of integrable modules.
We also introduce a notion of dg-2-representation for quantum Kac–Moody algebras, and in particular of parabolic 2-Verma modules.