Várilly-Alvarado, AnthonyViray, Bianca2018-11-092018-11-092017Várilly-Alvarado, Anthony and Viray, Bianca. "Abelian n -Division Fields of Elliptic Curves and Brauer Groups of Product Kummer & Abelian Surfaces." <i>Forum of Mathematics, Sigma,</i> 5, (2017) Cambridge University Press: https://doi.org/10.1017/fms.2017.16.https://hdl.handle.net/1911/103304Let Y be a principal homogeneous space of an abelian surface, or a K3 surface, over a finitely generated extension of Q. In 2008, Skorobogatov and Zarhin showed that the Brauer group modulo algebraic classes BrY/Br1Y is finite. We study this quotient for the family of surfaces that are geometrically isomorphic to a product of isogenous non-CM elliptic curves, as well as the related family of geometrically Kummer surfaces; both families can be characterized by their geometric Néron–Severi lattices. Over a field of characteristic 0, we prove that the existence of a strong uniform bound on the size of the odd torsion of BrY/Br1Y is equivalent to the existence of a strong uniform bound on integers n for which there exist non-CM elliptic curves with abelian n-division fields. Using the same methods we show that, for a fixed prime ℓ, a number field k of fixed degree r, and a fixed discriminant of the geometric Néron–Severi lattice, #(BrY/Br1Y)[ℓ∞] is bounded by a constant that depends only on ℓ, r, and the discriminant.engThis is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.Journal articledivision-fieldshttps://doi.org/10.1017/fms.2017.16