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arXiv 1111.2343math.RT
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Graham簇与幂零锥上的反常层

Graham's Variety and Perverse Sheaves on the Nilpotent Cone

Amber Russell

摘要:

在最近的工作中,格雷厄姆构建了一个映射到幂零锥的变体,在某些方面类似于斯普林格决议。一个方面,其中格雷厄姆的地图不同的是,它不是在一般的同构的主要轨道,而是普遍的覆叠映射。这个映射在幂零锥上产生一个半单的反常层,我们在这里讨论这个反常层的和项的描述问题。对于类型$A_n$,关键工具是已知的施普林格纤维的仿射铺设的组合描述。

英文摘要:

In recent work, Graham has constructed a variety with a map to the nilpotent cone which is similar in some ways to the Springer resolution. One aspect in which Graham's map differs is that it is not in general an isomorphism over the principal orbit, but rather the universal covering map. This map gives rise to a certain semisimple perverse sheaf on the nilpotent cone, and we discuss here the problem of describing the summands of this perverse sheaf. For type $A_n$, a key tool is a known combinatorial description of an affine paving of Springer fibers.

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