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arXiv 1107.1871math.RTmath.GR
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关于Deligne-Lusztig簇的上同调

On the Cohomology of Deligne-Lusztig Varieties

David A. Craven

摘要:

本文提出了李型群的特殊Deligne-Lusztig簇的上同调的幂单特征标的度的一个猜想,并得到了它的一些推论,这些度是Broué交换亏群猜想的几何形式中的一个必要数据,可以用来在新的情况下验证这个几何猜想. Broué猜想的几何版本应该产生一个更组合定义的导出等价,称为反常等价。我们证明了我们的代数度是一个整数(这是不明显的),并有一个完美的等距正确的奇偶性,并验证了它诱导一个反常等价的所有幂幺块的群的李型循环亏损群,只要形状的布劳尔树是已知的(即,不是E7和E8)。它也被用来寻找一些非循环情况下的反常等价。本文是对李型群Broué猜想的一个导出等价证明的精确形式的数学描述的一个贡献。

英文摘要:

In this paper, we present a conjecture on the degree of unipotent characters in the cohomology of particular Deligne-Lusztig varieties for groups of Lie type, and derive consequences of it. These degrees are a necessary piece of data in the geometric version of Broué's abelian defect group conjecture, and can be used to verify this geometric conjecture in new cases. The geometric version of Broué's conjecture should produce a more combinatorially defined derived equivalence, called a perverse equivalence. We prove that our conjectural degree is an integer (which is not obvious) and has the correct parity for a perfect isometry, and verify that it induces a perverse equivalence for all unipotent blocks of groups of Lie type with cyclic defect groups, whenever the shape of the Brauer tree is known (i.e., not E7 and E8). It has also been used to find perverse equivalences for some non-cyclic cases. This paper is a contribution to the conjectural description of the exact form of a derived equivalence proving Broué's conjecture for groups of Lie type.

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