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arXiv 1104.4828math.AGmath.RT
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$G$ -丛的模栈

The moduli stack of $G$-bundles

Jonathan Wang

摘要:

本文对$G$ -丛的模栈的几何性质作了初步的研究。对于基域上的代数群$G$和平面的、可表示的、投射态射影态射的概型的模栈$X \to S$,我们给出了模栈$Bun_G$是$S$上具有示意的、仿射对角的局部有限表示的代数栈的完整证明.在这个过程中,我们证明了$BG$和Hom栈的一些性质。然后,我们定义了一个水平结构上的$Bun_G$提供替代介绍准紧凑的开放子栈。最后,证明了当$G$是光滑的且$X \to S$是相对曲线时,$Bun_G$在$S$上是光滑的.

英文摘要:

In this paper, we give an expository account of the geometric properties of the moduli stack of $G$-bundles. For $G$ an algebraic group over a base field and $X \to S$ a flat, finitely presented, projective morphism of schemes, we give a complete proof that the moduli stack $Bun_G$ is an algebraic stack locally of finite presentation over $S$ with schematic, affine diagonal. In the process, we prove some properties of $BG$ and Hom stacks. We then define a level structure on $Bun_G$ to provide alternative presentations of quasi-compact open substacks. Finally, we prove that $Bun_G$ is smooth over $S$ if $G$ is smooth and $X \to S$ is a relative curve.

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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