Alvis-Curtis Duality for Finite General Linear Groups and a Generalized Mullineux Involution

Abstract

We study the effect of Alvis-Curtis duality on the unipotent representations of ${\mathrm{GL}}_n(q)$ in non-defining characteristic $\ell$. We show that the permutation induced on the simple modules can be expressed in terms of a generalization of the Mullineux involution on the set of all partitions, which involves both $\ell$ and the order of $q$ modulo $\ell$.