Lee's spin Gromov–Witten/Hurwitz correspondence

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Let (B,ϑ)(B,\vartheta) be a spin curve, let g,dg,d be integers, and let k1,…,knk_1,\ldots,k_n satisfy

∑iki=g−1+d(1−g(B))+n.\sum_i k_i=g-1+d(1-g(B))+n.

Write c‾k=∑μ oddκk,μ⋅μ\overline{c}_k=\sum_{\mu\ \textup{odd}}\kappa_{k,\mu}\cdot\mu for the spin completed cycle, let Hd(B,ϑ;μ1,…,μn)H_d(B,\vartheta;\mu^1,\ldots,\mu^n) denote the spin Hurwitz number, and define the stationary spin Gromov–Witten invariants by

⟨τk1⋯τkn⟩g,dB,ϑ=∫[M‾g,n(B,d)]loc,ϑ∏i=1nψikiev⁡i∗(ω),\left\langle \tau_{k_1}\cdots\tau_{k_n}\right\rangle_{g,d}^{B,\vartheta}=\int_{[\overline{\mathcal{M}}_{g,n}(B,d)]^{{\rm loc},\vartheta}}\prod_{i=1}^n\psi_i^{k_i}\operatorname{ev}_i^*(\omega),

where ω∈H2(P1,Z)\omega\in H^2(\mathbb{P}^1,\mathbb{Z}) is the class of a point. Spin GW/H correspondence. For all such data,

⟨τk1⋯τkn⟩g,dB,ϑ=Hd(B,ϑ;(−1)k1k1!(2k1)!c‾2k1+1,…,(−1)knkn!(2kn)!c‾2kn+1),\left\langle \tau_{k_1}\cdots\tau_{k_n}\right\rangle_{g,d}^{B,\vartheta}=H_d\left(B,\vartheta;\frac{(-1)^{k_1}k_1!}{(2k_1)!}\overline{c}_{2k_1+1},\ldots,\frac{(-1)^{k_n}k_n!}{(2k_n)!}\overline{c}_{2k_n+1}\right),

with HdH_d extended by linearity. The conjecture generalises earlier conjectures of Maulik–Pandharipande; it is known for (B,ϑ)=(P1,O(−1))(B,\vartheta)=(\mathbb{P}^1,\mathcal{O}(-1)), while the general correspondence remains open.

References

Primary source

Alessandro Giacchetto, Reinier Kramer, Danilo Lewański and Adrien Sauvaget, “The Spin Gromov-Witten/Hurwitz correspondence for P^1”, arXiv:2208.03259 (2025).

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