The Laplace-transform conjecture for the J-function

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Let C=(Σ,x,y)\mathcal C=(\Sigma,x,y) be a spectral curve and let γ⊂Σ∖b\gamma\subset\Sigma\setminus{\bf b} be an admissible path associated with e−x/ue^{-x/\mathfrak u}. Let η\eta be the CohFT pairing, let Φ(γ,−u)\Phi(\gamma,-\mathfrak u) be the class associated with γ\gamma, and let S∗S^* be the dual calibration operator. Laplace-transform conjecture. There exists a ν\nu-vector ν(u)\nu(\mathfrak u) such that the J-function J(−u)=−uS∗(−u)ν(u)J(-\mathfrak u)=-\mathfrak u S^*(-\mathfrak u)\nu(\mathfrak u) satisfies

∫γe−x(z)/uy(z) dx(z)=−η(J(−u),Φ(γ,−u)).\int_\gamma e^{-x(z)/\mathfrak u}y(z)\,dx(z)=-\eta\bigl(J(-\mathfrak u),\Phi(\gamma,-\mathfrak u)\bigr).

This conjecture identifies the spectral-curve one-point function with the geometric J-function through a Laplace transform. The paper checks it in the two examples studied, but does not establish it in general.

References

Primary source

Shuai Guo, Ce Ji and Qingsheng Zhang, “A generalization of the Witten conjecture through spectral curve”, arXiv:2309.12271 (2025).

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