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Semiinfinite sheaves on affine flag varieties

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arxiv 2503.18412 v2 pith:TYXEU6LQ submitted 2025-03-24 math.RT

Pramod N. Achar , Gurbir Dhillon , Simon Riche This is my paper · ORCID
classification math.RT
keywords flagsheavesaffinecategoryfieldgroupreductivesemiinfinite
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We study a category of semiinfinite sheaves on the affine flag variety of a connected reductive algebraic group, with coefficients in a field (of arbitrary characteristic different from that of the base field), generalizing some results of Gaitsgory and showing that this category behaves like familiar categories of sheaves on flag varieties in many respects. Our interest is motivated by expected relations with representation theory of the Lie algebra of the Langlands dual reductive group.

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  1. Modular intersection cohomology of Drinfeld's compactifications

    math.RT 2025-05 accept novelty 6.0 of 10

    In good characteristic, the stalks of intersection cohomology complexes on Drinfeld's compactifications and Zastava schemes are described by the q-analogue of Kostant's partition function, independently of the coeffic...

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