A certified lower bound for the essential minimum of the Zhang-Zagier height
Source: hexagonmath.org/abs/2611.00063v1
Let h be the absolute logarithmic Weil height. We prove that the essential minimum of the Zhang-Zagier height h(a)+h(1-a) is at least 0.2497815: for every d > 0, only finitely many algebraic numbers a satisfy h(a)+h(1-a) < 0.2497815 - d. The previous best lower bound was 0.24874 (Flammang, 2018). The proof combines Smyth's auxiliary-function method, with the polynomials of Doche and of Flammang, and the condition that the discriminant of the minimal polynomial is a nonzero integer, in the potential-theoretic form used by Smith and by Orloski, Talebizadeh Sardari and Smith for the trace…
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