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arXiv 1805.10550math.RT
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Z/m-分次李代数与反常层,IV

Z/m-graded Lie algebras and perverse sheaves, IV

George Lusztig, Zhiwei Yun

摘要:

设G是C上的约化群。设G的李代数g有一个以循环群Z/m为指标的给定分次(g_j),使得g_0包含g的一个Cartan子代数. G的子群G_0对应于g_0作用于g_1中幂零元幂零元的簇上,且具有多个轨道。我们感兴趣的是计算这些轨道的系数在不可约的G-等变局部系统中的“主块“的闭包的局部交上同调。我们表明,这些可以计算一个纯粹的组合算法。

英文摘要:

Let G be a reductive group over C. Assume that the Lie algebra g of G has a given grading (g_j) indexed by a cyclic group Z/m such that g_0 contains a Cartan subalgebra of g. The subgroup G_0 of G corresponding to g_0 acts on the variety of nilpotent elements in g_1 with finitely many orbits. We are interested in computing the local intersection cohomology of the closures of these orbits with coefficients in irreducible G-equivariant local systems which are in the "principal block". We show that these can be computed by a purely combinatorial algorithm.

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