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arXiv · 2508.01527

Semi-infinite parabolic IC-sheaf II: the Ran space version

Gurbir Dhillon·Sergey Lysenko
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Abstract

This paper is a sequel to arXiv:2310.0638. Let G be a split reductive group. We define the parabolic semi-infinite category on the Ran version of the affine Grassmanian Gr_{G,Ran}. We study the semi-infinite parabolic IC-sheaf in this category. We provide several descriptions of this object, one as certain colimit, another as an intermediate extension in certain category. We relate the global and local semi-infinite categories of sheaves. We also relate the intersection cohomology sheaf of the Drinfeld compactification of Bun_P with the semi-infinite parabolic IC-sheaf.

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Gurbir Dhillon, Sergey Lysenko. 2025-08-03. Semi-infinite parabolic IC-sheaf II: the Ran space version. https://arxiv.org/abs/2508.01527

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