Harish-Chandra theories, Ennola $d$-ality and Rouquier blocks for spetses

Abstract

It has been shown that the theory of unipotent characters of finite reductive groups admits a generalisation to objects whose Weyl group is a spetsial complex reflection group, called spetses. In this paper we prove several natural properties satisfied by the unipotent characters of spetses, in particular the validity of all Harish-Chandra theories as well as the existence of Ennola $d$-alities for all integers $d$, Alvis--Curtis duality, and compatibility with Rouquier blocks of relative Hecke algebras.