Decomposition numbers for perverse sheaves

Details Decomposition numbers for perverse sheaves Decomposition numbers for perverse sheaves

2008-03-17

arxiv.org/abs/0803.2326v1

Mathematics

Algebraic Geometry

Scientific paper

The purpose of this article is to set foundations for decomposition numbers of perverse sheaves, to give some methods to calculate them in simple cases, and to compute them concretely in two situations: for a simple (Kleinian) surface singularity, and for the closure of the minimal non-trivial orbit in a simple Lie algebra. This work has applications to modular representation theory, for Weyl groups using the nilpotent cone of the corresponding semisimple Lie algebra, and for reductive algebraic group schemes using the affine Grassmannian of the Langlands dual group.

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