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arXiv · 1311.1975

Grassmannians and Koszul duality

Jan Weidner
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Abstract

Let $X$ 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 $\mathcal O$ is governed by a Koszul-algebra in small examples.

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Jan Weidner. 2014-06-13. Grassmannians and Koszul duality. https://doi.org/10.1007/s00209-014-1345-z

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