The Jordan-Hölder series for nearby cycles on some Shimura varieties and affine flag varieties

The Jordan-Hölder series for nearby cycles on some Shimura varieties and affine flag varieties
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Jordan-Hölder 系列用于一些 Shimura 品种和仿射旗品种的附近周期

DOI:
10.1515/crelle.2007.063
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发表时间:
2004
影响因子:
1.9
通讯作者:
T. Haines
T. Haines
中科院分区:
数学1区
文献类型:
--
作者:
Ulrich Goertz;T. Haines

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摘要 我们研究了某些 Shimura 簇和 Rapoport-Zink 局部模型上的邻近循环的 Jordan-Hölder 级数,以及仿射格拉斯曼到仿射旗簇(及其 p 进类似物)的 Beilinson 变形的有限维片段。我们根据某些上同调群给出了不可约成分的重数的公式,并且我们还提供了根据仿射赫克代数来计算重数的算法。
Abstract We study the Jordan-Hölder series for nearby cycles on certain Shimura varieties and Rapoport-Zink local models, and on finite-dimensional pieces of Beilinson's deformation of the affine Grassmannian to the affine flag variety (and their p-adic analogues). We give a formula for the multiplicities of irreducible constituents in terms of certain cohomology groups, and we also provide an algorithm to compute multiplicities, in terms of the affine Hecke algebra.