Intersection cohomology of Drinfeld's compactifications

Details Intersection cohomology of Drinfeld's compactifications Intersection cohomology of Drinfeld's compactifications

2000-12-15

arxiv.org/abs/math/0012129v2

Mathematics

Algebraic Geometry

Scientific paper

Let $X$ be a smooth complete curve, $G$ be a reductive group and $P\subset G$ a parabolic. Following Drinfeld, one defines a compactification $\widetilde{\on{Bun}}_P$ of the moduli stack of $P$-bundles on $X$. The present paper is concerned with the explicit description of the Intersection Cohomology sheaf of $\widetilde{\on{Bun}}_P$. The description is given in terms of the combinatorics of the Langlands dual Lie algebra $\check{\mathfrak g}$.

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