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arxiv: 1304.2642 · v2 · pith:R4SWZF67new · submitted 2013-04-09 · 🧮 math.RT

Weyl group actions on the Springer sheaf

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keywords springeractionsgroupweylcorrespondencesheafagreeapplicable
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We show that two Weyl group actions on the Springer sheaf with arbitrary coefficients, one defined by Fourier transform and one by restriction, agree up to a twist by the sign character. This generalizes a familiar result from the setting of l-adic cohomology, making it applicable to modular representation theory. We use the Weyl group actions to define a Springer correspondence in this generality, and identify the zero weight spaces of small representations in terms of this Springer correspondence.

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