English

Genus 3 curves whose Jacobians have endomorphisms by $Q(\zeta _7 + \overline{\zeta}_7)$

Algebraic Geometry 2014-11-11 v1

Abstract

In this work we consider constructions of genus three curves XX such that End(Jac(X))Q\mathrm{End}(\mathrm{Jac}(X)) \otimes Q contains the totally real cubic number field Q(ζ7+ζ7)Q(\zeta _ 7 + \overline{\zeta}_7). We construct explicit two-dimensional families defined over Q(s;t)Q(s; t) whose generic member is a nonhyperelliptic genus 3 curve with this property. The case when X is hyperelliptic was studied by the authors Hoffman and Wang in a previous work. We calculate the zeta function of one of these curves. Conjecturally this zeta function is described by a modular form.

Keywords

Cite

@article{arxiv.1411.2151,
  title  = {Genus 3 curves whose Jacobians have endomorphisms by $Q(\zeta _7 + \overline{\zeta}_7)$},
  author = {J. William Hoffman and Zhibin Liang and Yukiko Sakai and Haohao Wang},
  journal= {arXiv preprint arXiv:1411.2151},
  year   = {2014}
}