  Let W be a complex reflection group, acting on a complex vector space H. Kato
has recently introduced the notion of a "Kostka system," which is a certain
collection of finite-dimensional W-equivariant modules for the symmetric
algebra on H. In this paper, we show that Kostka systems can be used to
construct "exotic" t-structures on the derived category of finite-dimensional
modules, and we prove a derived-equivalence result for these t-structures.

Representation Theory