English

A geometric linear Chabauty comparison theorem

Number Theory 2021-12-13 v3 Algebraic Geometry

Abstract

The Chabauty-Coleman method is a pp-adic method for finding all rational points on curves of genus gg whose Jacobians have Mordell-Weil rank r<gr < g. Recently, Edixhoven and Lido developed a geometric quadratic Chabauty method that was adapted by Spelier to cover the case of geometric linear Chabauty. We compare the geometric linear Chabauty method and the Chabauty-Coleman method and show that geometric linear Chabauty can outperform Chabauty-Coleman in certain cases. However, as Chabauty-Coleman remains more practical for general computations, we discuss how to strengthen Chabauty-Coleman to make it theoretically equivalent to geometric linear Chabauty. We apply these methods to genus 2 and genus 3 curves.

Cite

@article{arxiv.2102.04967,
  title  = {A geometric linear Chabauty comparison theorem},
  author = {Sachi Hashimoto and Pim Spelier},
  journal= {arXiv preprint arXiv:2102.04967},
  year   = {2021}
}

Comments

fixed minor issues and updated exposition; to appear in Acta Arithmetica

R2 v1 2026-06-23T22:59:22.936Z