Mixed hybrid conjecture for universal abelian schemes
Let be an abelian variety over , and let . Let be as in the definition referenced in the source, and let be a subset. Let be an irreducible component, and let be the image of .
Mixed hybrid conjecture. (1) The subvariety is weakly special. (2) If, for some , one has , then there exist and an abelian subscheme such that
Equivalently, is an irreducible component of
(3) In general, if is the generic point of and is the fibre of over , then there exist , a morphism , and an abelian subvariety such that
The first part is established by the cited theorem on the hybrid conjecture for ; the torsion and general fibre assertions describe the remaining mixed hybrid conjecture. The supplied context does not establish their resolution.
References
Primary source
Rodolphe Richard and Andrei Yafaev, “Hybrid Conjecture in a Mixed Shimura variety”, arXiv:2604.23376 (2026).
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