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arXiv 2108.04286math.RT
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典型代数群的正特征的$\mathfrak{sl}_2$ -三元组

On $\mathfrak{sl}_2$-triples for classical algebraic groups in positive characteristic

Simon M. Goodwin, Rachel Pengelly

摘要:

设$k$是特征$p > 2$的代数闭域,令$n \in \mathbb Z_{>0}$,并取$G$是经典代数群$\mathrm{GL}_n(k)$,$\mathrm{SL}_n(k)$,$\mathrm{Sp}_n(k)$,$\mathrm O_n(k)$或$\mathrm{SO}_n(k)$之一,其中有$\mathfrak g = \operatorname{Lie} G$ .我们确定了$\mathfrak g$的幂零锥$\mathcal N$的最大$G$ -稳定闭子簇$\mathcal V$,使得$\mathcal V$中的$G$ -轨道与$\mathfrak{sl}_2$ -三元组$(e,h,f)$与$e,f \in \mathcal V$的$G$ -轨道成双射.这个结果决定了Jacobson-Morozov和Kostant关于$\mathfrak{sl}_2$ -三元组的定理在多大程度上适用于具有“小”奇特征的代数闭域上的经典代数群。

英文摘要:

Let $k$ be an algebraically closed field of characteristic $p > 2$, let $n \in \mathbb Z_{>0}$, and take $G$ to be one of the classical algebraic groups $\mathrm{GL}_n(k)$, $\mathrm{SL}_n(k)$, $\mathrm{Sp}_n(k)$, $\mathrm O_n(k)$ or $\mathrm{SO}_n(k)$, with $\mathfrak g = \operatorname{Lie} G$. We determine the maximal $G$-stable closed subvariety $\mathcal V$ of the nilpotent cone $\mathcal N$ of $\mathfrak g$ such that the $G$-orbits in $\mathcal V$ are in bijection with the $G$-orbits of $\mathfrak{sl}_2$-triples $(e,h,f)$ with $e,f \in \mathcal V$. This result determines to what extent the theorems of Jacobson--Morozov and Kostant on $\mathfrak{sl}_2$-triples hold for classical algebraic groups over an algebraically closed field of "small" odd characteristic.

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