Title

Modular perverse sheaves on flag varieties, II: Koszul duality and formality

Document Type

Article

Publication Date

1-1-2016

Abstract

Building on the theory of parity sheaves due to Juteau, Mautner, and Williamson, we develop a formalism of "mixed modular perverse sheaves" for varieties equipped with a stratification by affine spaces. We then give two applications: (1) a "Koszultype" derived equivalence relating a given flag variety to the Langlands dual flag variety and (2) a formality theorem for the modular derived category of a flag variety (extending a previous result of Riche, Soergel, and Williamson).

Publication Source (Journal or Book title)

Duke Mathematical Journal

First Page

161

Last Page

215

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