Functorial Bogomolov-type lower bound for transverse subvarieties

Let (A,L)(A,\mathcal{L}) be a polarized abelian variety of dimension gg defined over a number field K\mathbb{K}, and let XAX\subset A be a transverse subvariety with finite stabilizer. Let ψ:AA\psi:A\to A be an isogeny. Write μψL(X)\mu_{\psi^*\mathcal{L}}(X) for the essential minimum associated with the pulled-back polarization, and let codX\operatorname{cod}X denote the codimension of XX. Then Functorial Bogomolov-type bound.

μψL(X)>c(g,[K:Q],hL(A))minη=±η(degψLAdegψLX)12codX+η.\mu_{\psi^*\mathcal{L}}(X)>c\bigl(g,[\mathbb{K}:\mathbb{Q}],h_{\mathcal{L}}(A)\bigr)\min_{\eta'=\pm\eta}\left(\frac{\deg_{\psi^*\mathcal{L}}A}{\deg_{\psi^*\mathcal{L}}X}\right)^{\frac{1}{2\operatorname{cod}X}+\eta'}.

Here c(g,[K:Q],hL(A))c(g,[\mathbb{K}:\mathbb{Q}],h_{\mathcal{L}}(A)) depends only on gg, [K:Q][\mathbb{K}:\mathbb{Q}], and hL(A)h_{\mathcal{L}}(A). The bound is proposed as a functorial effective lower bound for the essential minimum, uniform under isogenies and depending on the polarization through the displayed degrees.

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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