A variant of the induction theorem for Springer representations

Details A variant of the induction theorem for Springer representations A variant of the induction theorem for Springer representations

2005-07-27

arxiv.org/abs/math/0507558v2

Mathematics

Representation Theory

18 pages. In this revised version, some errors are corrected. In particular some restrictions are added to the main results

Scientific paper

Let G be a simple algebraic group over C with the Weyl group W. For a unipotent element u of G, let B_u be the variety of Borel subgroups of G containing u. Let L be a Levi subgroup of a parabolic subgroup of G with the Weyl subgroup W_L. Assume that u is in L and let B_u^L be the corresponding variety for L. The induction theorem of Springer representations describes the W-module structure of H*(B_u) in terms of the W_L-module structure of H*(B_u^L). In this paper, we prove a certain refinement of the induction theorem by considering the action of a cyclic group of order e on H^*(B_u). As a corollary, we obtain a description of the values of Green functions at e-th root of unity.

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