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arXiv · 1802.05901

An affineness criterion for algebraic groups and applications

C. Sancho de Salas·F. Sancho de Salas·J. B. Sancho de Salas
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Abstract

We prove that a smooth and connected algebraic group $G$ is affine if and only if any invertible sheaf on any normal $G$-variety is $G$-invariant. For the proof, a key ingredient is the following result: if $G$ is a connected and smooth algebraic group and $\mathcal L$ is a $G$-invariant invertible sheaf on a $G$-variety $X$, then the action of $G$ on $X$ extends to a projective action on the complete linear ${\mathbb P}(H^0(X,{\mathcal L})$. As an application of the affineness criterion, we give a new and simple proof of Chevalley-Barsotti Theorem on the structure of algebraic groups.

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C. Sancho de Salas, F. Sancho de Salas, J. B. Sancho de Salas. 2018-02-16. An affineness criterion for algebraic groups and applications. https://arxiv.org/abs/1802.05901

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