Affordable Access

Abelian $n$-division fields of elliptic curves and Brauer groups of product Kummer & abelian surfaces

Authors
  • Várilly-Alvarado, Anthony
  • Viray, Bianca
Type
Preprint
Publication Date
Jun 30, 2016
Submission Date
Jun 29, 2016
Identifiers
arXiv ID: 1606.09240
Source
arXiv
License
Yellow
External links

Abstract

Let Y be a principal homogeneous space of an abelian surface, or a K3 surface, over a finitely generated extension of the rational numbers. In 2008, Skorobogatov and Zarhin showed that the Brauer group modulo algebraic classes Br Y/Br_1 Y is finite. We study this quotient for a family of principal homogeneous spaces of abelian surfaces, as well as a related family of geometrically Kummer surfaces of Picard rank 19. Over fields of characteristic 0, we relate the existence of a nontrivial transcendental Brauer class on Y to the commutativity of the Galois group of an associated n-division field. For a fixed number field k, prime l, and a certain geometric N\'eron-Severi lattice, we show that the l-primary part of #(Br Y/Br_1 Y) is bounded, independent of Y. We prove the equivalence among strong uniform boundedness statements for #(Br Y/Br_1 Y), for the existence of abelian n-division fields, and for rational points on certain modular curves.

Report this publication

Statistics

Seen <100 times