Construction of central elements in the affine Hecke algebra via nearby cycles

Construction of central elements in the affine Hecke algebra via nearby cycles
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通过邻近周期构造仿射赫克代数的中心元素

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发表时间:
1999
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通讯作者:
D. Gaitsgory
D. Gaitsgory
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作者:
D. Gaitsgory

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0.1。概述。设G是有限域Fq上的连通约化群,G(K)是局部域K=Fq((T))上的对应群。设G(O)⊂G(K)是G(K)的极大紧子群(这里O=FQ[[t]]),Hsph表示G(K)关于G(O)的Hecke代数。换言之,作为向量空间的HSPH由紧支撑的双G(O)不变函数G(K)→Q组成,其乘积由下式定义
0.1. Overview. Let G be a connected reductive group over a finite field Fq and let G(K) be the corresponding group over the local field K = Fq((t)). Let G(O) ⊂ G(K) be a maximal compact subgroup of G(K) (here O = Fq[[t]]) and let Hsph denote the Hecke algebra of G(K) with respect to G(O). In other words, Hsph as a vector space consists of compactly supported bi–G(O)–invariant functions G(K) → Q and the product is defined by