Non-density Conjecture for bounded-height subsets of abelian varieties

Let AA be an abelian variety of dimension gg, let VAV\subset A be an irreducible subvariety of dimension dd, and let ΓA\Gamma\subset A be a subgroup of finite rank. The variety VV is weak-transverse if it is not contained in any proper algebraic subgroup of AA, and transverse if it is not contained in any translate of a proper algebraic subgroup. For a height-induced seminorm, let Oε={ξA:ξε}\mathcal{O}_\varepsilon=\{\xi\in A:\|\xi\|\leq\varepsilon\}, Γε=Γ+Oε\Gamma_\varepsilon=\Gamma+\mathcal{O}_\varepsilon, and VK0=VOK0V_{K_0}=V\cap\mathcal{O}_{K_0}. Define Sk(Ve,F)=VecodBk(B+F)S_k(V^e,F)=V^e\cap\bigcup_{\operatorname{cod}B\geq k}(B+F). For all real K0K_0, there exists an effective ε>0\varepsilon>0 such that:

  1. If VV is weak-transverse, then Sd+1(VK0,Oε)S_{d+1}(V_{K_0},\mathcal{O}_\varepsilon) is not Zariski-dense in VV.
  2. If VV is transverse, then Sd+1(VK0,Γε)S_{d+1}(V_{K_0},\Gamma_\varepsilon) is not Zariski-dense in VV.

The source proves that the two parts are equivalent. This conjecture would imply effective Bogomolov-type statements, and its transverse part also implies a Mordell–Lang plus Bogomolov theorem.

Sources & referencesView supporting material

Primary source

Viada Evelina, “Lower bounds for the normalized height and non-dense subsets of varieties in an abelian variety”, arXiv:0806.0487 (2008).

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