Algebraic curves uniformized by congruence subgroups of triangle groups
Number Theory
2015-06-04 v1
Abstract
We construct certain subgroups of hyperbolic triangle groups which we call "congruence" subgroups. These groups include the classical congruence subgroups of SL_2(ZZ), Hecke triangle groups, and 19 families of arithmetic triangle groups associated to Shimura curves. We determine the field of moduli of the curves associated to these groups and thereby realize the groups PSL_2(q) and PGL_2(q) regularly as Galois groups.
Keywords
Cite
@article{arxiv.1506.01371,
title = {Algebraic curves uniformized by congruence subgroups of triangle groups},
author = {Pete L. Clark and John Voight},
journal= {arXiv preprint arXiv:1506.01371},
year = {2015}
}
Comments
48 pages, comments welcome!