English

Automorphism groups of origami curves

Geometric Topology 2019-07-26 v1

Abstract

A closed Riemann surface SS (of genus at least one) is called an origami curve if it admits a non-constant holomorphic map β:SE\beta:S \to E with at most one branch value, where EE is a genus one Riemann surface. In this case, (S,β)(S,\beta) is called an origami pair and Aut(S,β){\rm Aut}(S,\beta) is the group of conformal automorphisms ϕ\phi of SS such that β=βϕ\beta=\beta \circ \phi. Let GG be a finite group. It is a known fact that GG can be realized as a subgroup of Aut(S,β){\rm Aut}(S,\beta) for a suitable origami pair (S,β)(S,\beta). It is also known that GG can be realized as a group of conformal automorphisms of a Riemann surface XX of genus g2g \geq 2 and with quotient orbifold X/GX/G also of genus γ2\gamma \geq 2. Given a conformal action of GG on a surface XX as before, we prove that there is an origami pair (S,β)(S,\beta), where SS has genus gg and GAut(S,β)G \cong {\rm Aut}(S,\beta) such that the actions of Aut(S,β){\rm Aut}(S,\beta) on SS and that of GG on XX are topologically equivalent.

Keywords

Cite

@article{arxiv.1907.10692,
  title  = {Automorphism groups of origami curves},
  author = {Ruben A. Hidalgo},
  journal= {arXiv preprint arXiv:1907.10692},
  year   = {2019}
}