English

Conditional algorithmic Mordell

Number Theory 2024-08-22 v1 Algebraic Geometry

Abstract

We specify a Turing machine TMordellT_{\text{Mordell}} with the following properties. 1. On input (K,C/K)(K,C/K), with K/QK/\mathbb{Q} a number field and C/KC/K a smooth projective hyperbolic curve, if TMordellT_{\text{Mordell}} terminates, then it outputs C(K)C(K). 2. The Hodge, Tate, and Fontaine-Mazur conjectures imply that TMordellT_{\text{Mordell}} always terminates. Similarly we specify a Turing machine TShafarevichT_{\text{Shafarevich}} with the following properties. 1. On input (g,K,S,d)(g, K,S, d), with g,dZ+g, d \in \mathbb{Z}^+, K/QK/\mathbb{Q} a number field, and SS a finite set of places of KK, if TShafarevichT_{\text{Shafarevich}} terminates, then it outputs the finitely many polarized gg-dimensional abelian varieties A/KA/K, with polarization of degree dd, having good reduction outside SS. 2. The Hodge, Tate, and Fontaine-Mazur conjectures imply that TShafarevichT_{\text{Shafarevich}} always terminates.

Keywords

Cite

@article{arxiv.2408.11653,
  title  = {Conditional algorithmic Mordell},
  author = {Levent Alpöge and Brian Lawrence},
  journal= {arXiv preprint arXiv:2408.11653},
  year   = {2024}
}
R2 v1 2026-06-28T18:19:33.429Z