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arXiv 2007.16164math.AGmath.CV
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线性代数群中光滑簇嵌入的存在性

Existence of Embeddings of Smooth Varieties into Linear Algebraic Groups

Peter Feller, Immanuel van Santen

摘要:

证明了维数为$d$的光滑仿射簇嵌入维数至少为$2d+2$的单代数群.我们这样做是通过建立嵌入的存在性顺利仿射品种到总空间的某些主丛。对于后者,我们采用并建立在灵活的仿射品种由于Kaliman的参数横截性的结果。通过调整一个基于Chow群的参数,由于布洛赫,Murthy,和Szpiro,我们表明,我们的结果是最佳的可能改善的约束$2d+1$。为了研究嵌入方法的极限,我们利用齐性空间的有理同调群计算,建立了复光滑簇的有理同调的一个控制结果.

英文摘要:

We prove that every smooth affine variety of dimension $d$ embeds into every simple algebraic group of dimension at least $2d+2$. We do this by establishing the existence of embeddings of smooth affine varieties into the total space of certain principal bundles. For the latter we employ and build upon parametric transversality results for flexible affine varieties due to Kaliman. By adapting a Chow-group-based argument due to Bloch, Murthy, and Szpiro, we show that our result is optimal up to a possible improvement of the bound to $2d+1$. In order to study the limits of our embedding method, we use rational homology group calculations of homogeneous spaces and we establish a domination result for rational homology of complex smooth varieties.

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