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arXiv math/0010270math.QA
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小量子群上模范畴的另一种实现

Another realization of the category of modules over the small quantum group

S. Arkhipov, D. Gaitsgory

摘要:

设$g$是一个半单单连通李代数,$U_\ell$是相应的幂次可分的量子群,其中$\ell$是偶数阶单位根单位根.另外,令$u_\ell\subset U_\ell$为相应的“小”量子群。本文建立了$U_\ell$和$u_\ell$的表示范畴之间的关系:我们证明了$u_\ell$ -模范畴与$U_\ell$ -模范畴是自然等价的,后者对于由量子Frobenius映射$U_\ell\ti U(\check g)$提升的表示具有{ \it Hecke本征性质},其中$g$是Langlands对偶李代数.这种描述允许在具有Hecke特征属性的仿射旗簇上的反常层方面来表达范畴$u_\ell$ -mod中的正则链接类。此外,它可以作为程序的基础,以理解范畴$u_\ell$ -mod和相应仿射代数在临界水平上的表示范畴之间的联系。

英文摘要:

Let $g$ be a semi-simple simply-connected Lie algebra and let $U_\ell$ be the corresponding quantum group with divided powers, where $\ell$ is an even order root of unity. Let in addition $u_\ell\subset U_\ell$ be the corresponding "small" quantum group. In this paper we establish the following relation between the categories of representations of $U_\ell$ and $u_\ell$: We show that the category of $u_\ell$-modules is naturally equivalent to the category of $U_\ell$-modules, which have a {\it Hecke eigen-property} with respect to representations lifted by means of the quantum Frobenius map $U_\ell\ti U(\check g)$, where $g$ is the Langlands dual Lie algebra. This description allows to express the regular linkage class in the category $u_\ell$-mod in terms of perverse sheaves on the affine flag variety with a Hecke eigen-property. Moreover, it can serve as a basis to the program to understand the connection between the category $u_\ell$-mod and the category of representations of the corresponding affine algebra at the critical level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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