English

Minimal Weierstrass models and regular models of hyperelliptic curves

Number Theory 2026-05-19 v2

Abstract

Let CC be a hyperelliptic curve of genus g2g\ge 2 over a discrete valuation field KK with perfect residue field. We study the minimal Weierstrass models of CC. When there is more than one such model, we find interesting properties on the minimal regular model and the canonical model of CC. For curves of genus 22, we characterize the existence of the stable reduction in terms of the minimal Weierstrass models. When there is more than one such model, we can compute the Euler factor of Jac(C)\mathrm{Jac}(C) and a volume form of the N\'eron model of Jac(C)\mathrm{Jac}(C), using two specific minimal Weierstrass models.

Keywords

Cite

@article{arxiv.2603.19065,
  title  = {Minimal Weierstrass models and regular models of hyperelliptic curves},
  author = {Qing Liu},
  journal= {arXiv preprint arXiv:2603.19065},
  year   = {2026}
}

Comments

Add {\S}1.7 on stably minimal Weierstrass models; more details for the extended Tate's algorithm {\S}2.2; Add {\S}3.5, {\S}3.6 on Tamagawa number and conductor of Jac(C). Minor changes in the rest of the paper