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arXiv 1409.4464math.RT
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Character公式与$\mathfrak{sl}_2[t]$的倾斜模实现

Character formulae and a realization of tilting modules for $\mathfrak{sl}_2[t]$

Matthew Bennett, Vyjayanthi Chari

摘要:

本文研究了与$\mathfrak{sl}_2$相关的当前代数的分次模范畴。该范畴具有许多优良的性质,包括作者在以前的工作中建立的倾斜理论。证明了$\mathfrak{sl}_2[t]$的不可分解倾斜模是基本整体Weyl模的外幂,并给出了标准滤子和余标准滤子的滤子重数.我们的结果的一个有趣的结果(这是从抽象的定义是显而易见的)是,一个不可分解的倾斜模允许一个自由的右作用的环的对称多项式在许多变量。此外,如果我们对这个环中的增广理想取模,得到的$\mathfrak{sl}_2[t]$ -模同构于局部Weyl模的对偶。

英文摘要:

In this paper we study the category of graded modules for the current algebra associated to $\mathfrak{sl}_2$. The category enjoys many nice properties, including a tilting theory which was established in previous work of the authors. We show that the indecomposable tilting modules for $\mathfrak{sl}_2[t]$ are the exterior powers of the fundamental global Weyl module and give the filtration multiplicities in the standard and costandard filtration. An interesting consequence of our result (which is far from obvious from the abstract definition) is that an indecomposable tilting module admits a free right action of the ring of symmetric polynomials in finitely many variables. Moreover, if we go modulo the augmentation ideal in this ring, the resulting $\mathfrak{sl}_2[t]$-module is isomorphic to the dual of a local Weyl module.

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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