Smooth quotients of generalized Fermat curves

DOI10.1007/S13163-022-00422-5arXiv2202.12663MaRDI QIDQ6392142

Rubén A. Hidalgo

Publication date: 25 February 2022

Abstract: A closed Riemann surface $S$ is called a generalized Fermat curve of type $(p,n)$, where $n,pgeq2$ are integers such that $(p-1)(n-1)>2$, if it admits a group $Hcong{mathbbZ}_p^n$ of conformal automorphisms with quotient orbifold $S/H$ of genus zero with exactly $n+1$ cone points, each one of order $p$; in this case $H$ is called a generalized Fermat group of type $(p,n)$. In this case, it is known that $S$ is non-hyperelliptic and that $H$ is its unique generalized Fermat group of type $(p,n)$. Also, explicit equations for them, as a fiber product of classical Fermat curves of degree $p$, are known. For $p$ a prime integer, we describe those subgroups $K$ of $H$ acting freely on $S$, together with algebraic equations for $S/K$, and determine those $K$ such that $S/K$ is hyperelliptic.

Mathematics Subject Classification ID

Compact Riemann surfaces and uniformization (30F10) Teichmüller theory for Riemann surfaces (30F60) Kleinian groups (aspects of compact Riemann surfaces and uniformization) (30F40) Automorphisms of curves (14H37)

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