English

On superspecial hyperelliptic curves of genus 5 whose automorphism groups contain $(\mathbb{Z}/2\mathbb{Z})^3$

Algebraic Geometry 2026-03-24 v1 Number Theory

Abstract

While the numbers of superspecial curves of genus at most 3 are well understood, and several computational approaches have been developed to count superspecial curves of genus 4 with large automorphism groups, much less is known in higher genera. In this paper, we construct a feasible algorithm to enumerate superspecial hyperelliptic curves of genus 5 whose automorphism groups contain (Z/2Z)3(\mathbb{Z}/2\mathbb{Z})^3. We implement and executing our algorithm in Magma, we succeeded in enumerating such superspecial curves in every characteristic 11<p<100011 < p < 1000.

Keywords

Cite

@article{arxiv.2603.21569,
  title  = {On superspecial hyperelliptic curves of genus 5 whose automorphism groups contain $(\mathbb{Z}/2\mathbb{Z})^3$},
  author = {Ryo Ohashi and Momonari Kudo},
  journal= {arXiv preprint arXiv:2603.21569},
  year   = {2026}
}

Comments

24 pages, comments welcome!