The half Seiberg–Witten curve topological free-energy conjecture

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Let r>2r>2 and let Q1,…,QrQ_1,\ldots,Q_r and Λ\Lambda be the parameters of the half Seiberg–Witten curve, with B2gB_{2g} denoting the Bernoulli number. Topological free-energy conjecture. For the half Seiberg–Witten curve, the topological free energies are

F0=∑1≤a<b≤r[34(Qa−Qb)2+14(Qa−Qb)2ln⁡(Λr(Qa−Qb)2)],F_0=\sum_{1\leq a<b\leq r}\left[\frac{3}{4}(Q_a-Q_b)^2+\frac{1}{4}(Q_a-Q_b)^2\ln\left(\frac{\Lambda^{r}}{(Q_a-Q_b)^2}\right)\right], F1=−∑1≤a<b≤r124ln⁡(Λr(Qa−Qb)2),F_1=-\sum_{1\leq a<b\leq r}\frac{1}{24}\ln\left(\frac{\Lambda^{r}}{(Q_a-Q_b)^2}\right),

and, for g≥2g\geq2,

Fg=−B2g2g(2g−2)∑1≤a<b≤r−1(Qa−Qb)2−2g.F_g=-\frac{B_{2g}}{2g(2g-2)}\sum_{1\leq a<b\leq r-1}(Q_a-Q_b)^{2-2g}.

These formulae provide the proposed closed expressions for the topological free energies in the half Seiberg–Witten-curve case, where analogous formulae for the Gaiotto and CDO curves are not available for r>2r>2.

References

Primary source

Gaëtan Borot, Nitin Kumar Chidambaram and Giacomo Umer, “Whittaker vectors at finite energy scale, topological recursion and Hurwitz numbers”, arXiv:2403.16938 (2025).

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