Next order energy asymptotics for Riesz potentials on flat tori

Let $Λ$ be a lattice in ${\bf R}^d$ with positive co-volume. Among $Λ$-periodic $N$-point configurations, we consider the minimal renormalized Riesz $s$-energy $\mathcal{E}_{s,Λ}(N)$. While the dominant term in the asymptotic expansion of $\mathcal{E}_{s,Λ}(N)$ as $N$ goes to infinity in the long range case that $0<s<d$ (or $s=\log$) can be obtained from classical potential theory, the next order term(s) require a different approach. Here we derive the form of the next order term or terms, namely for $s>0$ they are of the form $C_{s,d}|Λ|^{-s/d}N^{1+s/d}$ and $-\frac{2}{d}N\log N+\left(C_{\log,d}-2ζ'_Λ(0)\right)N$ where we show that the constant $C_{s,d}$ is independent of the lattice $Λ$.

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