English

Triangular curves and cyclotomic Zariski tuples

Algebraic Geometry 2019-11-28 v2

Abstract

The purpose of this paper is to exhibit infinite families of conjugate projective curves in a number field whose complement have the same abelian fundamental group, but are non-homeomorphic. In particular, for any d>3d>3 we find Zariski tuples parametrized by the dd-roots of unity up to complex conjugation. As a consequence, for any divisor mm of dd, m1,2,3,4,6m\neq 1,2,3,4,6, we find arithmetic Zariski ϕ(m)2\frac{\phi(m)}{2}-tuples with coefficients in the corresponding cyclotomic field. These curves have abelian fundamental group and they are distinguished using a linking invariant.

Keywords

Cite

@article{arxiv.1904.09305,
  title  = {Triangular curves and cyclotomic Zariski tuples},
  author = {Enrique Artal Bartolo and Jose I. Cogolludo-Agustin and Jorge Martín-Morales},
  journal= {arXiv preprint arXiv:1904.09305},
  year   = {2019}
}

Comments

15 pages, 3 figures. To appear in Collectanea Mathematica

R2 v1 2026-06-23T08:45:00.598Z