Homology of affine Springer fibers in the unramified case
Homology of affine Springer fibers in the unramified case
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未分支情况下仿射施普林格纤维的同源性
DOI:
10.1215/s0012-7094-04-12135-9
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发表时间:
2003
影响因子:
2.5
通讯作者:
R. Macpherson
中科院分区:
文献类型:
--
作者:
M. Goresky;R. Kottwitz;R. Macpherson
Assuming a certain “purity” conjecture, we derive a formula for the (complex) cohomology groups of the affine Springer fiber corresponding to any unramified regular semisimple element. We use this calculation to present a complex analog of the fundamental lemma for function fields. We show that the “kappa” orbital integral that arises in the fundamental lemma is equal to the Lefschetz trace of the Frobenius acting on the etale cohomology of a related variety.