Vojta's height conjecture for log-general-type pairs over function fields

Let (X,D)({\mathcal X},{\mathcal D}) be a pair over a function field F=k(B)F=k(B) whose generic fiber (X,D)(X,D) is a pair of log general type. For a point PX(L)P\in{\mathcal X}(L) corresponding to a cover BPBB_P\to B of degree nn, with field extension LFL\supset F, define

χ(P)=χ(BP)n.\chi(P)=\frac{\chi(B_P)}{n}.

Let ND(1)(P)N_D^{(1)}(P) be the cardinality of the support of PDP^*D.

Vojta's function-field conjecture. For every ε>0\varepsilon>0 there exist a constant CC and a proper closed subvariety ZZ such that, for all P(XZ)(F)P\in({\mathcal X}\setminus Z)(\overline F),

hKX+D(P)C(χ(P)+ND(1)(P))+O(1).h_{K_{\mathcal X}+D}(P)\leq C\bigl(\chi(P)+N_D^{(1)}(P)\bigr)+O(1).

This is the function-field analogue of Vojta's main conjecture for log-general-type pairs. The source presents it as conjectural and relates bounded-height density to isotriviality.

Sources & referencesView supporting material

Primary source

Kenneth Ascher and Amos Turchet, “Hyperbolicity of varieties of log general type”, arXiv:2001.10475 (2020).

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