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arxiv: 1711.01541 · v3 · pith:NXDDNMRGnew · submitted 2017-11-05 · 🧮 math.NT

No transcendental Brauer-Manin obstructions on abelian varieties

classification 🧮 math.NT
keywords brauergroupabelianbrauer-maninobstructionorthogonalresultsthere
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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.

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