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Main Authors: Cerchia, Michael, Rakvi
Format: Preprint
Published: 2025
Subjects:
Online Access:https://arxiv.org/abs/2509.22895
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author Cerchia, Michael
Rakvi
author_facet Cerchia, Michael
Rakvi
contents We completely determine the $1085$ open subgroups $H$ of $\operatorname{GL}_2(\widehat{\mathbb{Z}})$ of prime-power level that satisfy $-I \in H$ and $\operatorname{det}(H)=\widehat{\mathbb{Z}}^{\times}$ for which the corresponding modular curve $X_H$ has infinitely many quadratic points. When $g(X_H)\geq 2$ this is equivalent to determining all the hyperelliptic modular curves of prime-power level and all the bielliptic modular curves of prime-power level that admit a degree two map to a positive rank elliptic curve. From the moduli perspective, this means that there are exactly 1085 subgroups $H$ of $\operatorname{GL}_2(\widehat{\mathbb{Z}})$ of prime-power level for which there are infinitely many elliptic curves $E/K$ over quadratic extensions such that $ρ_E(G_k)$ is conjugate to a subgroup of $H$.
format Preprint
id arxiv_https___arxiv_org_abs_2509_22895
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Modular curves of prime-power level with infinitely many quadratic points
Cerchia, Michael
Rakvi
Number Theory
We completely determine the $1085$ open subgroups $H$ of $\operatorname{GL}_2(\widehat{\mathbb{Z}})$ of prime-power level that satisfy $-I \in H$ and $\operatorname{det}(H)=\widehat{\mathbb{Z}}^{\times}$ for which the corresponding modular curve $X_H$ has infinitely many quadratic points. When $g(X_H)\geq 2$ this is equivalent to determining all the hyperelliptic modular curves of prime-power level and all the bielliptic modular curves of prime-power level that admit a degree two map to a positive rank elliptic curve. From the moduli perspective, this means that there are exactly 1085 subgroups $H$ of $\operatorname{GL}_2(\widehat{\mathbb{Z}})$ of prime-power level for which there are infinitely many elliptic curves $E/K$ over quadratic extensions such that $ρ_E(G_k)$ is conjugate to a subgroup of $H$.
title Modular curves of prime-power level with infinitely many quadratic points
topic Number Theory
url https://arxiv.org/abs/2509.22895