Bogomolov conjecture for powers of the multiplicative group

Let VGmNV\subset {\mathbb G}_m^N be an irreducible subvariety defined over Q\overline{\mathbb Q}. For each ϵ0\epsilon\geq 0, set

Sϵ:={P(Q)N:h(P)ϵ}.S_{\epsilon}:=\left\{P\in\left(\overline{\mathbb Q}^{*}\right)^N: h(P)\leq\epsilon\right\}.

Bogomolov conjecture. If, for each ϵ>0\epsilon>0, the set V(Q)SϵV(\overline{\mathbb Q})\cap S_{\epsilon} is Zariski dense in VV, then VV is a torsion translate of an algebraic subgroup of GmN{\mathbb G}_m^N.

This strengthens the torsion-point case of Laurent's theorem by replacing height zero with arbitrarily small height. The conjecture for every power of the multiplicative group was proved by Zhang.

Sources & referencesView supporting material

Primary source

Dragos Ghioca, “A Bogomolov type statement for function fields”, arXiv:1307.3748 (2013).

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