Realisation of abelian varieties as automorphism groups

preprint2022arXivOpen access

Abstract

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

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