English

Unlikely intersections between isogeny orbits and curves

Number Theory 2021-10-05 v5 Algebraic Geometry

Abstract

Fix an abelian variety A0A_0 and a non-isotrivial abelian scheme over a smooth irreducible curve, both defined over the algebraic numbers. Consider the union of all images of translates of a fixed finite-rank subgroup of A0A_0, also defined over the algebraic numbers, by abelian subvarieties of A0A_0 of codimension at least kk under all isogenies between A0A_0 and some fiber of the abelian scheme. We characterize the curves inside the abelian scheme which are defined over the algebraic numbers, dominate the base curve and potentially intersect this set in infinitely many points. Our proof follows the Pila-Zannier strategy.

Keywords

Cite

@article{arxiv.1801.05701,
  title  = {Unlikely intersections between isogeny orbits and curves},
  author = {Gabriel Andreas Dill},
  journal= {arXiv preprint arXiv:1801.05701},
  year   = {2021}
}

Comments

34 pages, accepted to JEMS, minor revisions

R2 v1 2026-06-22T23:47:53.309Z