Revista Matemática Iberoamericana

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Volume 33, Issue 1, 2017, pp. 169–182
DOI: 10.4171/RMI/931

Published online: 2017-02-22

Twists of non-hyperelliptic curves

Elisa Lorenzo García[1]

(1) Université de Rennes I, France

In this paper we present a method for computing the set of twists of a non-singular projective curve defined over an arbitrary (perfect) field $k$. The method is based on a correspondence between twists and solutions to a Galois embedding problem. When in addition, this curve is non-hyperelliptic we show how to compute equations for the twists. If $k=\mathbb{F}_q$ the method then becomes an algorithm, since in this case, it is known how to solve the Galois embedding problems that appear. As an example we compute the set of twists of the non-hyperelliptic genus 6 curve $x^7-y^3-1=0$ when we consider it defined over a number field such that $[k(\zeta_{21}):k]=12$. For each twist equations are exhibited.

Keywords: Twists, non-hyperelliptic curves, Galois embedding problems

Lorenzo García Elisa: Twists of non-hyperelliptic curves. Rev. Mat. Iberoam. 33 (2017), 169-182. doi: 10.4171/RMI/931