Relative dynamical Bogomolov conjecture for split polarized endomorphisms

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Let KK be the base field, let ℓ≥2\ell\geq 2, and let F:P1ℓ→P1ℓ\mathbf{F}:\mathbb{P}^{\ell}_1\to\mathbb{P}^{\ell}_1 be an isotrivial-free split polarized endomorphism over KK with polarization degree at least 22. Let V⊂P1ℓ\mathbf{V}\subset\mathbb{P}^{\ell}_1 be an irreducible projective subvariety defined over KK such that

dim⁡V<ℓ−1.\dim \mathbf{V}<\ell-1.

Assume that V\mathbf{V} is not contained in an F\mathbf{F}-preperiodic subvariety other than P1ℓ\mathbb{P}^{\ell}_1. Write h^F\hat{h}_{F} for the fiber-wise height associated with F\mathbf{F}.

Relative dynamical Bogomolov conjecture. There exists ϵ=ϵ(F,V)>0\epsilon=\epsilon(\mathbf{F},\mathbf{V})>0 such that

{P∈V(Q‾):h^F(P)≤ϵ}\left\{P\in\mathbf{V}(\overline{\mathbb{Q}}):\hat{h}_{F}(P)\leq\epsilon\right\}

is not Zariski dense in V\mathbf{V}.

This is presented as a generalization suggested by the Pink–Zilber conjectures and as a dynamical analogue of the relative Bogomolov conjecture. The source states it as a proposed general principle; the paper proves particular relative and geometric Bogomolov results, but does not establish this full statement.

References

Primary source

Niki Myrto Mavraki and Harry Schmidt, “On the dynamical Bogomolov conjecture for families of split rational maps”, arXiv:2201.10455 (2024).

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