Bounded Height Conjecture for unlikely intersections in 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\} and Γε=Γ+Oε\Gamma_\varepsilon=\Gamma+\mathcal{O}_\varepsilon. Define Sk(Ve,F)=VecodBk(B+F)S_k(V^e,F)=V^e\cap\bigcup_{\operatorname{cod}B\geq k}(B+F), with BB ranging over abelian subvarieties of codimension at least kk. Bounded Height Conjecture. There exists ε>0\varepsilon>0 and a nonempty Zariski-open set V0VV^0\subset V such that:

  1. If VV is weak-transverse, then Sd+1(V0,Oε)S_{d+1}(V^0,\mathcal{O}_\varepsilon) has bounded height.
  2. If VV is transverse, then Sd+1(V0,Γε)S_{d+1}(V^0,\Gamma_\varepsilon) has bounded height.

The conjecture is the height component of the preceding non-density statement. The source notes that the weak-transverse assertion implies the transverse one, whereas the converse does not hold in general.

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).

Additional references

2 papers in this index state this conjecture (2008). The statement above is taken from the most recent of them; the others are arXiv:0801.2071.

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