Unlikely intersections between isogeny orbits and curves
Gabriel A. DillUniversity of Oxford, UK
Fix an abelian variety 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 , also defined over the algebraic numbers, by abelian subvarieties of of codimension at least under all isogenies between 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.
Cite this article
Gabriel A. Dill, Unlikely intersections between isogeny orbits and curves. J. Eur. Math. Soc. 23 (2021), no. 7, pp. 2405–2438DOI 10.4171/JEMS/1057