English

Regular dessins d'enfants with dicyclic group of automorphisms

Algebraic Geometry 2018-09-17 v1

Abstract

Let GnG_{n} be the dicyclic group of order 4n4n. We observe that, up to isomorphisms, (i) for n2n \geq 2 even there is exactly one regular dessin d'enfant with automorphism group GnG_{n}, and (ii) for n3n \geq 3 odd there are exactly two of them. All of them are produced on very well known hyperelliptic Riemann surfaces. We observe, for each of these cases, that the isotypical decomposition, induced by the action of GnG_{n}, of its jacobian variety has only one component. If nn is even, then the action is purely-non-free, that is, every element acts with fixed points. In the case nn odd, the action is not purely-non-free in one of the actions and purely non-free for the other.

Keywords

Cite

@article{arxiv.1809.05429,
  title  = {Regular dessins d'enfants with dicyclic group of automorphisms},
  author = {Rubén A. Hidalgo and Saúl Quispe},
  journal= {arXiv preprint arXiv:1809.05429},
  year   = {2018}
}