No transcendental Brauer-Manin obstructions on abelian varieties

Abstract

Suppose $X$ is a torsor under an abelian variety $A$ over a number field. We show that any adelic point of $X$ that is orthogonal to the algebraic Brauer group of $X$ is orthogonal to the whole Brauer group of $X$. We also show that if there is a Brauer-Manin obstruction to the existence of rational points on $X$, then there is already an obstruction coming from the locally constant Brauer classes. These results had previously been established under the assumption that $A$ has finite Tate-Shafarevich group. Our results are unconditional.

v3: Fixed a gap in the proof of Lemma 13, and other minor changes

References in corpus (1)

• A higher dimensional generalization of Lichtenbaum duality in terms of the Albanese map