Rémond's height conjecture for division groups

Let GammaoindentotiGamma oindent ot i be a finitely generated subgroup of QQ^*, and let GammadivGamma_{\mathrm{div}} be its division group. For alphaQalpha\in\overline{\mathbb{Q}}^*, write h(α)h(\alpha) for its absolute logarithmic Weil height.

Rémond's conjecture. The following forms are expected to hold:

  1. There is a positive constant cc, depending only on Γ\Gamma, such that
h(α)c[Q(Γdiv,α):Q(Γdiv)]h(\alpha)\geq \frac{c}{[\mathbb{Q}(\Gamma_{\mathrm{div}},\alpha):\mathbb{Q}(\Gamma_{\mathrm{div}})]}

for all αQΓdiv\alpha\in\overline{\mathbb{Q}}^*\setminus\Gamma_{\mathrm{div}}.

  1. For every ε>0\varepsilon>0, there is a positive constant cεc_\varepsilon, depending only on Γ\Gamma and ε\varepsilon, such that
h(α)cε[Q(Γdiv,α):Q(Γdiv)]1+εh(\alpha)\geq \frac{c_\varepsilon}{[\mathbb{Q}(\Gamma_{\mathrm{div}},\alpha):\mathbb{Q}(\Gamma_{\mathrm{div}})]^{1+\varepsilon}}

for all αQΓdiv\alpha\in\overline{\mathbb{Q}}^*\setminus\Gamma_{\mathrm{div}}.

  1. Small-height elements of Q(Γdiv)\mathbb{Q}(\Gamma_{\mathrm{div}})^* belong to Γdiv\Gamma_{\mathrm{div}}.
Sources & referencesView supporting material

Primary source

Arnaud Plessis, “A new way to tackle a conjecture of Rémond”, arXiv:2201.06226 (2023).

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