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arXiv 0909.1860math.RTmath.RA
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抛物范畴O的奇异块与有限W-代数

Singular blocks of parabolic category O and finite W-algebras

Ben Webster

摘要:

证明了半单李代数的抛物范畴O(包括奇异抛物范畴)的每一个整无穷小块都可以实现为同一李代数的有限W-代数上的“厚”范畴O的一个满子范畴.构造这个有限W-代数的幂零性由块的中心特征标决定,所取的子范畴是由依赖于原抛物的双边理想所杀死的子范畴。所讨论的等价性是由Milicic-Soergel和Losev的等价性导出的。我们还证明了一个结果的一些独立的利益:奇异块的抛物范畴O可以几何实现为“部分Whittaker层”的部分旗品种。

英文摘要:

We show that each integral infinitesimal block of parabolic category O (including singular ones) for a semi-simple Lie algebra can be realized as a full subcategory of a "thick" category O over a finite W-algebra for the same Lie algebra. The nilpotent used to construct this finite W-algebra is determined by the central character of the block, and the subcategory taken is that killed by a two-sided ideal depending on the original parabolic. The equivalences in question are induced by those of Milicic-Soergel and Losev. We also give a proof of a result of some independent interest: the singular blocks of parabolic category O can be geometrically realized as "partial Whittaker sheaves" on partial flag varieties.

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