Families of abelian varieties with many isogenous fibres
- Resource Type
- Working Paper
- Authors
- Orr, Martin
- Source
- Journal f\"ur die reine und angewandte Mathematik, 2015, Issue 705, 211-231
- Subject
- Mathematics - Algebraic Geometry
Mathematics - Number Theory
11G18, 14K02
- Language
Let Z be a subvariety of the moduli space of principally polarised abelian varieties of dimension g over the complex numbers. Suppose that Z contains a Zariski dense set of points which correspond to abelian varieties from a single isogeny class. A generalisation of a conjecture of Andr\'e and Pink predicts that Z is a weakly special subvariety. We prove this when dim Z = 1 using the Pila--Zannier method and the Masser--W\"ustholz isogeny theorem. This generalises results of Edixhoven and Yafaev when the Hecke orbit consists of CM points and of Pink when it consists of Galois generic points.
Comment: Gap in Lemma 3.3 found and corrected by Gabriel Dill