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arXiv 1612.03120math.RT
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量子群单位根分解数的Fock空间模型

A Fock space model for decomposition numbers for quantum groups at roots of unity

Arun Ram, Martina Lanini, Paul Sobaje

摘要:

在本文中,我们构造了一个“抽象Fock空间”的一般李型,作为一个推广的无限楔形$q$ -Fock空间熟悉的类型$A$。具体来说,对于每个正整数$\ell$,我们定义了一个$\mathbb{Z}[q,q^{-1}]$ -模块$\mathcal{F}_{\ell}$与酒吧对合指定的发电机和“矫直关系”改编自那些出现在柏原-三和-斯特恩制定的$q$ -Fock空间。通过将$\mathcal{F}_{\ell}$与相应的仿射Hecke代数联系起来,我们证明了抽象Fock空间具有标准基和规范基,对于这些基,转移阵产生抛物仿射Kazhdan-Lusztig多项式.这一性质和方便的组合标记的基地$\mathcal{F}_{\ell}$占主导地位的积分权重使$\mathcal{F}_{\ell}$一个有用的组合工具,用于确定量子群的Weyl模的分解数在单位根。

英文摘要:

In this paper we construct an "abstract Fock space" for general Lie types that serves as a generalisation of the infinite wedge $q$-Fock space familiar in type $A$. Specifically, for each positive integer $\ell$, we define a $\mathbb{Z}[q,q^{-1}]$-module $\mathcal{F}_{\ell}$ with bar involution by specifying generators and "straightening relations" adapted from those appearing in the Kashiwara-Miwa-Stern formulation of the $q$-Fock space. By relating $\mathcal{F}_{\ell}$ to the corresponding affine Hecke algebra we show that the abstract Fock space has standard and canonical bases for which the transition matrix produces parabolic affine Kazhdan-Lusztig polynomials. This property and the convenient combinatorial labeling of bases of $\mathcal{F}_{\ell}$ by dominant integral weights makes $\mathcal{F}_{\ell}$ a useful combinatorial tool for determining decomposition numbers of Weyl modules for quantum groups at roots of unity.

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