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