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arXiv 1111.4230math.RTmath.AG
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Whittaker函数与Demazure算子

Whittaker Functions and Demazure Operators

Ben Brubaker, Daniel Bump, Anthony Licata

摘要:

我们考虑了一个由外尔群索引的分裂半单p-adic群的非分歧主列表示的Whittaker模型中Iwahori固定向量的自然基.我们表明,该基础的元素可以计算从另一个应用Demazure Lusztig运营商。精确的身份涉及校正项,这可以通过一个组合算法计算,这是相同的计算的纤维的Bott-Samelson决议的舒伯特品种。Demazure-Lusztig算子满足普通Hecke算子所满足的辫子关系和二次关系,这导致仿射Hecke代数对L-群的极大环面上的函数的作用.这个作用之前由Lusztig使用旗簇的等变K理论描述,导致Kazhdan和Lusztig证明了Deligne-Langlands猜想。本文应用该作用量给出了岩堀惠特克函数基向量的一个简单公式。

英文摘要:

We consider a natural basis of the Iwahori fixed vectors in the Whittaker model of an unramified principal series representation of a split semisimple p- adic group, indexed by the Weyl group. We show that the elements of this basis may be computed from one another by applying Demazure-Lusztig operators. The precise identities involve correction terms, which may be calculated by a combinatorial algorithm that is identical to the computation of the fibers of the Bott-Samelson resolution of a Schubert variety. The Demazure-Lusztig operators satisfy the braid and quadratic relations satisfied by the ordinary Hecke operators, and this leads to an action of the affine Hecke algebra on functions on the maximal torus of the L-group. This action was previously described by Lusztig using equivariant K-theory of the flag variety, leading to the proof of the Deligne-Langlands conjecture by Kazhdan and Lusztig. In the present paper, the action is applied to give a simple formula for the basis vectors of the Iwahori Whittaker functions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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