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arXiv 1201.1102math.RTmath.AG
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与$E_6$、$F_4$和$G_2$型李代数分次有关的表示的轨道闭包的几何

Geometry of orbit closures for the representations associated to gradings of Lie algebras of types $E_6$, $F_4$ and $G_2$

Witold Kraśkiewicz, Jerzy Weyman

摘要:

本文研究了$E_6$,$F_4$和$G_2$型单李代数上与各种分次有关的单代数群表示类的轨道闭包.对这些作用的轨道进行分类的方法是由温伯格提出的。给出了轨道的描述,退化偏序,并判定了轨道闭包的正规性。我们还研究了轨道闭合的有理奇点,Cohen-Macaulay和Gorenstein性质。我们给出了轨道闭包的定义理想的生成元。

英文摘要:

In this paper we investigate the orbit closures for the class of representations of simple algebraic groups associated to various gradings on a simple Lie algebras of type $E_6$, $F_4$ and $G_2$. The methods for classifying the orbits for these actions were developed by Vinberg. We give the orbit descriptions, the degeneration partial orders, and decide the normality of the orbit closures. We also investigate the rational singularities, Cohen-Macaulay and Gorenstein properties for the orbit closures. We give the generators of the defining ideals of orbit closures.

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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