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arXiv 1710.02471math.AGmath.GR
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球面簇的等变模型

Equivariant models of spherical varieties

Mikhail Borovoi, Giuliano Gagliardi

摘要:

设$G$是特征为0的代数闭域$k$上的连通半单群.设$Y=G/H$是$G$的球面齐性空间,$Y'$是$Y$的球面嵌入.令$k_0$为$k$的子字段。令$G_0$是$G$的$k_0$模型($k_0$形式)。证明了若$G_0$是分裂群的内形式,且$G$的子群$H$是球闭的,则$Y$存在$G_0$ -等变$k_0$ -模型.如果我们用$H$与它在$G$中的正规化子重合的更强假设来代替$H$是球闭的假设,则$Y$和$Y'$允许相容的$G_0$ -等变$k_0$ -模型,并且这些模型是唯一的。

英文摘要:

Let $G$ be a connected semisimple group over an algebraically closed field $k$ of characteristic 0. Let $Y=G/H$ be a spherical homogeneous space of $G$, and let $Y'$ be a spherical embedding of $Y$. Let $k_0$ be a subfield of $k$. Let $G_0$ be a $k_0$ -model ($k_0$-form) of $G$. We show that if $G_0$ is an inner form of a split group and if the subgroup $H$ of $G$ is spherically closed, then $Y$ admits a $G_0$-equivariant $k_0$-model. If we replace the assumption that $H$ is spherically closed by the stronger assumption that $H$ coincides with its normalizer in $G$, then $Y$ and $Y'$ admit compatible $G_0$-equivariant $k_0$-models, and these models are unique.

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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