Le Boudec's height lower-bound conjecture for quadratic twists

For integers A,BA,B with 4A3+27B204A^3+27B^2\neq 0, consider the quadratic twists

dy2=x3+Ax+Bdy^2=x^3+Ax+B

for positive square-free integers dd, and let ηd(A,B)\eta_d(A,B) be defined by

logηd(A,B)=min{h^E(d)(P):PE(d)(Q)E(d)(Q)tors},\log \eta_d(A,B)=\min\{\hat{h}_{E^{(d)}}(P):P\in E^{(d)}(\mathbb{Q})\setminus E^{(d)}(\mathbb{Q})_{\mathrm{tors}}\},

with ηd(A,B)=+\eta_d(A,B)=+\infty if the set is empty. Write S(X)S(X) for the set of positive square-free integers at most XX. Le Boudec's conjecture. For fixed ϵ>0\epsilon>0, the set of square-free dZ1d\in\mathbb{Z}_{\geq 1} such that

ηd(A,B)>ed1/2ϵ\eta_d(A,B)>e^{d^{1/2}-\epsilon}

has natural density 11 in S(X)S(X). This predicts that, for almost all quadratic twists in the family, the least nonzero canonical height is at least approximately d1/2d^{1/2} on the logarithmic scale.

Sources & referencesView supporting material

Primary source

Alan Zhao, “Heights of Rational Points on Mordell Curves”, arXiv:2108.10953 (2022).

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