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Article Dans Une Revue International Mathematics Research Notices Année : 2021

Duality for Commutative Group Stacks

Résumé

Abstract We study in this article the dual of a (strictly) commutative group stack $G$ and give some applications. Using the Picard functor and the Picard stack of $G$, we first give some sufficient conditions for $G$ to be dualizable. Then, for an algebraic stack $X$ with suitable assumptions, we define an Albanese morphism $a_X: X\longrightarrow A^1(X)$ where $A^1(X)$ is a torsor under the dual commutative group stack $A^0(X)$ of $\textrm{Pic}_{X/S}$. We prove that $a_X$ satisfies a natural universal property. We give two applications of our Albanese morphism. On the one hand, we give a geometric description of the elementary obstruction and of universal torsors (standard tools in the study of rational varieties over number fields). On the other hand, we give some examples of algebraic stacks that satisfy Grothendieck’s section conjecture.
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Dates et versions

hal-03544367 , version 1 (26-01-2022)

Identifiants

Citer

Sylvain Brochard. Duality for Commutative Group Stacks. International Mathematics Research Notices, 2021, 2021 (3), pp.2321-2388. ⟨10.1093/imrn/rnz161⟩. ⟨hal-03544367⟩
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