Algebra & Number Theory
- Algebra Number Theory
- Volume 12, Number 10 (2018), 2445-2470.
Degree and the Brauer–Manin obstruction
Let be a smooth projective variety of degree over a number field and suppose that is a counterexample to the Hasse principle explained by the Brauer–Manin obstruction. We consider the question of whether the obstruction is given by the -primary subgroup of the Brauer group, which would have both theoretic and algorithmic implications. We prove that this question has a positive answer in the case of torsors under abelian varieties, Kummer surfaces and (conditional on finiteness of Tate–Shafarevich groups) bielliptic surfaces. In the case of Kummer surfaces we show, more specifically, that the obstruction is already given by the -primary torsion, and indeed that this holds for higher-dimensional Kummer varieties as well. We construct a conic bundle over an elliptic curve that shows that, in general, the answer is no.
Algebra Number Theory, Volume 12, Number 10 (2018), 2445-2470.
Received: 19 December 2017
Revised: 12 July 2018
Accepted: 23 August 2018
First available in Project Euclid: 14 February 2019
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Creutz, Brendan; Viray, Bianca. Degree and the Brauer–Manin obstruction. Algebra Number Theory 12 (2018), no. 10, 2445--2470. doi:10.2140/ant.2018.12.2445. https://projecteuclid.org/euclid.ant/1550113228