Brauer groups and quotient stacks

Abstract

A natural question is to determine which algebraic stacks are qoutient stacks. In this paper we give some partial answers and relate it to the old question of whether, for a scheme X, the natural map from the Brauer goup (equivalence classes of Azumaya algebras) to the cohomological Brauer group (the torsion subgroup of $H^2(X,{\mathbb{G}}_m)$ is surjective.

American J. Math, to appear. (Latex2e, 17pp)

References in corpus (1)

• Quotients by Groupoids