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Field of moduli and field of definition for curves of genus 2

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arxiv math/0207015 v1 pith:GYQJKFK6 submitted 2002-07-02 math.NT math.AG

classification math.NTmath.AG
keywords definedmodulicurvepointcurvesfieldcorrespondinggenus
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Let M_2 be the moduli space that classifies genus 2 curves. If a curve C is defined over a field k, the corresponding moduli point P=[C] is defined over k. Mestre solved the converse problem for curves with Aut(C) isomorphic to C_2. Given a moduli point defined over k, Mestre finds an obstruction to the existence of a corresponding curve defined over k, that is an element in Br_2(k) not always trivial. In this paper we prove that for all the other possibilities of Aut(C), every moduli point defined over k is represented by a curve defined over k. We also give an explicit construction of such a curve in terms of the coordinates of the moduli point.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Genus 2 Supersingular Isogeny Oblivious Transfer

    cs.CR 2019-06 unverdicted novelty 6.0 of 10

    Extends Barreto-Oliveira-Benits supersingular isogeny oblivious transfer from elliptic curves to principally polarized supersingular abelian surfaces of genus 2.

  2. Undeniable signatures based on isogenies of supersingular hyperelliptic curves

    cs.CR 2019-08 conditional novelty 4.0 of 10

    This paper proposes an undeniable signature scheme built from isogenies of genus-2 supersingular hyperelliptic curves.

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