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arXiv 0907.1177math.AGmath.RT
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简单射影空间中的球轨道闭包及其正规化

Spherical orbit closures in simple projective spaces and their normalizations

Jacopo Gandini

摘要:

设G是特征为0的代数闭域k上的单连通半单代数群,设V是有限维有理单G-模。如果G/H \subset P(V)是一个球面轨道,且X是它的闭包,则我们描述了X的轨道及其正规化轨道.如果G/H的奇妙完备化是严格的,则给出了G/H的正规化态射是同胚的充要组合条件。如果G是单缀群或H是对称子群,则这些条件平凡地满足。

英文摘要:

Let G be a simply connected semisimple algebraic group over an algebraically closed field k of characteristic 0 and let V be a rational simple G-module of finite dimension. If G/H \subset P(V) is a spherical orbit and if X is its closure, then we describe the orbits of X and those of its normalization. If moreover the wonderful completion of G/H is strict, then we give necessary and sufficient combinatorial conditions so that the normalization morphism is a homeomorphism. Such conditions are trivially fulfilled if G is simply laced or if H is a symmetric subgroup.

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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