Dynamical Lang conjecture for rational maps

Fix an embedding of the moduli space Md\mathscr{M}_d in projective space, with associated height hMdh_{\mathscr{M}_d}. Let KK be a number field and d2d\geq2. Dynamical Lang conjecture. There is a positive constant C(K,d)C(K,d) such that

h^ϕ(P)C(K,d)max{log(NK/QRϕ),hMd(ϕ)},\widehat h_\phi(P)\geq C(K,d)\max\left\{\log\left(N_{K/\mathbb{Q}}\mathfrak{R}_\phi\right),h_{\mathscr{M}_d}(\langle\phi\rangle)\right\},

for all rational maps ϕK(z)\phi\in K(z) of degree dd and all non-preperiodic points PPK1P\in\mathbb{P}^1_K. This is a dynamical analogue of Lang's height conjecture and remains unresolved in the supplied text.

Sources & referencesView supporting material

Primary source

Robin Zhang, “The abcd conjecture, uniform boundedness, and dynamical systems”, arXiv:2206.09725 (2024).

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