Zhang's finiteness conjecture for small specializations of sections

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Let A→T0A\to T^0 be a non-isotrivial family of abelian varieties over a number field KK, with generic fiber AηA_{\eta} simple of dimension at least two. A section P:T0→AP:T^0\to A is non-torsion if it is not a torsion section, and hAt(Pt)h_{A_t}(P_t) denotes the canonical height of its specialization at tt. Zhang's conjecture. For each non-torsion section P:T0→AP:T^0\to A defined over Q‾\overline{\mathbb{Q}}, there exists an ϵ>0\epsilon>0 such that

{t∈T0(Q‾):hAt(Pt)≤ϵ}\{t\in T^0(\overline{\mathbb{Q}}): h_{A_t}(P_t)\le\epsilon\}

is finite. The conjecture predicts a strong finiteness property for points where a non-torsion section specializes to a point of uniformly small canonical height; it would make simultaneous sequences of small specializations highly constrained. Its status is not resolved in the supplied source context.

References

Primary source

Alexander Carney, “Specialization of canonical heights on abelian varieties”, arXiv:2110.07664 (2021).

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