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arXiv 2102.02581math.AG
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阿贝尔簇作为自同构群的实现

Realisation of abelian varieties as automorphism groups

Mathieu Florence

摘要:

设$A/F$是域上的阿贝尔簇.是否存在一个光滑的投射$F$簇$X$,使得$A$同构于$X/F$的自同构群方案?我们证明了这个问题的答案是肯定的,当且仅当$A$在$F$的代数闭包上只有1000个自同构。当使用$F=\mathbb C$时,该结果是由于Lombardo和Maffei。当$F$是代数闭的时,它是由Blanc和Brion独立得到的。

英文摘要:

Let $A/F$ be an abelian variety over a field. Does there exist a smooth projective $F$-variety $X$, such that $A$ is isomorphic to the automorphism group scheme of $X/F$? We show that the answer is positive, if and only if $A$ has only finitely many automorphisms, over an algebraic closure of $F$. When $F=\mathbb C$, this result is due to Lombardo and Maffei. When $F$ is algebraically closed, it was obtained independently by Blanc and Brion.

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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