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arXiv 2007.12638math.RT
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分次李代数的宇称层研究

Study of parity sheaves arising from graded Lie algebra

Tamanna Chatterjee

摘要:

设$G$是一个复的、连通的、约化的代数群,$χ:\mathbb{C}^\times \to G$是一个固定的余特征标,它定义了$\mathfrak{g}$上的一个分次,$\mathfrak{g}$是$G$的李代数。令$G_0$为$χ(\mathbb{C}^\times)$的中心化器。本文在关于域$\Bbbk$和群$G$的一些假设下,研究了$\mathfrak{g}_n$上的$G_0$ -等变宇称层.关于$G$的假设对于$GL_n$成立,并且对于任何$G$,它恢复了Lusztig在特征$0$中的结果。主要结果是每一个宇称层都是某个尖点对的抛物归纳的直和项。

英文摘要:

Let $G$ be a complex, connected, reductive, algebraic group, and $χ:\mathbb{C}^\times \to G$ be a fixed cocharacter that defines a grading on $\mathfrak{g}$, the Lie algebra of $G$. Let $G_0$ be the centralizer of $χ(\mathbb{C}^\times)$. In this paper, we study $G_0$-equivariant parity sheaves on $\mathfrak{g}_n$, under some assumptions on the field $\Bbbk$ and the group $G$. The assumption on $G$ holds for $GL_n$ and for any $G$, it recovers results of Lusztig in characteristic $0$. The main result is that every parity sheaf occurs as a direct summand of the parabolic induction of some cuspidal pair.

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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