Prime Torsion in the Brauer Group of an Elliptic Curve

2019/09/11 by Charlotte Ure, Ure, Charlotte
Computer Science · Mathematics · #14H52 (Secondary) #16K50 (Primary) 14F22 #Algebraic Geometry (math.AG) #Algebraic Geometry and Number Theory #Coding theory and cryptography #FOS: Mathematics #Finite Group Theory Research

paper · pdf · doi:10.48550/arxiv.1909.05317

openalex publication_date 2019/09/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We give an algorithm to explicitly determine all elements of the q-torsion (for q an odd prime) of the Brauer group of an elliptic curve over any base field of characteristic different from q, containing a primitive q-th root of unity. These elements of the Brauer group are given as tensor products of symbol algebras over the function field of the elliptic curve. We give sufficient conditions to determine if the Brauer classes that arise are trivial. Using our algorithm, we derive an upper bound on the symbol length of the prime torsion of Br(E)/Br(k).

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