Grassmannians and Koszul duality
arXiv:1311.1975 · doi:10.1007/s00209-014-1345-z
Abstract
Let be a partial flag variety, stratified by orbits of the Borel. We give a criterion for the category of modular perverse sheaves to be equivalent to modules over a Koszul ring. This implies that modular category is governed by a Koszul-algebra in small examples.
35 pages