English

Regular dessins with moduli fields of the form $\mathbb{Q}(\zeta_p,\sqrt[p]{q})$

Algebraic Geometry 2021-10-01 v1

Abstract

Gareth Jones asked during the 2014 SIGMAP conference for examples of regular dessins with nonabelian fields of moduli. In this paper, we first construct dessins whose moduli fields are nonabelian Galois extensions of the form Q(ζp,qp)\mathbb{Q}(\zeta_p,\sqrt[p]{q}), where pp is an odd prime and ζp\zeta_p is a ppth root of unity and qQq\in\mathbb{Q} is not a ppth power, and we then show that their regular closures have the same moduli fields. Finally, in the special case p=q=3p=q=3 we give another example of a regular dessin with moduli field Q(ζ3,33)\mathbb{Q}(\zeta_3,\sqrt[3]{3}) of degree 219342^{19}\cdot3^4 and genus 1415577714155777.

Keywords

Cite

@article{arxiv.2109.14945,
  title  = {Regular dessins with moduli fields of the form $\mathbb{Q}(\zeta_p,\sqrt[p]{q})$},
  author = {Nicolas Daire and Fumiharu Kato and Yoshiaki Uchino},
  journal= {arXiv preprint arXiv:2109.14945},
  year   = {2021}
}

Comments

18 pages, 12 figures