Triangular curves and cyclotomic Zariski tuples

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 $d>3$ we find Zariski tuples parametrized by the $d$-roots of unity up to complex conjugation. As a consequence, for any divisor $m$ of $d$, $m\ne 1,2,3,4,6$, we find arithmetic Zariski $\frac{\varphi (m)}{2}$-tuples with coefficients in the corresponding cyclotomic field. These curves have abelian fundamental group and they are distinguished using a linking invariant.

15 pages, 3 figures. To appear in Collectanea Mathematica