The asymptotic expansion conjecture for minimal Riesz 2-energy on the sphere

From papers

Let S2\mathbb{S}^2 be the unit sphere and let E2(S2;N)\mathcal{E}_2(\mathbb{S}^2;N) denote the minimal Riesz 22-energy of NN points on S2\mathbb{S}^2. Let γn(α)\gamma_n(\alpha) be the generalized Stieltjes constant appearing as the coefficient γn(α)n!\frac{\gamma_n(\alpha)}{n!} of (1s)n(1-s)^n in the Laurent expansion of the Hurwitz zeta function ζ(s,α)\zeta(s,\alpha) about s=1s=1. The asymptotic expansion conjecture.

E2(S2;N)=14N2logN+C2,2N2+o(N2),\mathcal{E}_2(\mathbb{S}^2;N)=\frac{1}{4}N^2\log N+C_{2,2}N^2+o(N^2),

where

C2,2=14(γlog(23π))+34π(γ1(23)γ1(13)).C_{2,2}=\frac{1}{4}\left(\gamma-\log(2\sqrt{3}\pi)\right)+\frac{\sqrt{3}}{4\pi}\left(\gamma_1(\tfrac{2}{3})-\gamma_1(\tfrac{1}{3})\right).

This conjectural asymptotic is used to sharpen lower bounds for logarithmic energy on the sphere. The source does not provide evidence of a resolution.

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Sources & referencesView supporting material

Primary source

Maryna Manskova, “Open problems UP24”, arXiv:2504.04845 (2025).

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