Exponential formula for reconstructing the wave function by topological recursion

Let x\boldsymbol{x} be the spectral-curve projection, let zi(x)z^i(x) denote the sheets above xx, and let ρ\rho be the determinantal solution of the differential system. Write ρ\rho in a local basis with blocks of sizes dkd_k, and let β=βk\boldsymbol{\beta}=\boldsymbol{\beta}_k be the corresponding points with local coordinates βk\beta_k. Let ug,n u_{g,n} be the topological-recursion correlation differentials, let u0,1 u_{0,1} be the leading differential, and define the prime form on the Riemann sphere by

E(z,z)=zzdzdz.E(z,z')=\frac{z-z'}{\sqrt{dz\,dz'}}.

For each kk, define

Vk(z)=Reszβkν0,1(z)ln(1x(z)1/dkx(z)1/dk),tk=Resβkν0,1,V_k(z)=\operatorname{Res}_{z'\to\beta_k}\nu_{0,1}(z')\ln\left(1-\frac{\boldsymbol{x}(z)^{1/d_k}}{\boldsymbol{x}(z')^{1/d_k}}\right),\qquad t_k=\operatorname{Res}_{\beta_k}\nu_{0,1},

and

Φk(z)=βkz(ν0,1dVk+tkdkdxx)+Vk(z)tkdklnx(z).\Phi_k(z)=\int_{\beta_k}^{z}\left(\nu_{0,1}-dV_k+\frac{t_k}{d_k}\frac{d\boldsymbol{x}}{\boldsymbol{x}}\right)+V_k(z)-\frac{t_k}{d_k}\ln\boldsymbol{x}(z).

Exponential formula. The solution should have the WKB expansion

(ρ(x)1ρ(x)xxdxdx)j,i=exp(1zj(x)zi(x)ν0,1)E(zi(x),zj(x))exp(2g2+n>02g2+nn!zj(x)zi(x)zj(x)zi(x)νg,n).\left(\frac{\rho(x')^{-1}\rho(x)}{x-x'}\sqrt{dx\,dx'}\right)_{j,i}=\frac{\exp\left(\hbar^{-1}\int_{z^j(x')}^{z^i(x)}\nu_{0,1}\right)}{E(z^i(x),z^j(x'))}\exp\left(\sum_{2g-2+n>0}\frac{\hbar^{2g-2+n}}{n!}\int_{z^j(x')}^{z^i(x)}\cdots\int_{z^j(x')}^{z^i(x)}\nu_{g,n}\right).

Consequently,

ρ(x)k,1;i=exp(1Φk(zi(x)))zi(x)βkexp(2g2+n>02g2+nn!βkzi(x)βkzi(x)νg,n),\rho(x)_{k,1;i}=\frac{\exp\left(\hbar^{-1}\Phi_k(z^i(x))\right)}{z^i(x)-\beta_k}\exp\left(\sum_{2g-2+n>0}\frac{\hbar^{2g-2+n}}{n!}\int_{\beta_k}^{z^i(x)}\cdots\int_{\beta_k}^{z^i(x)}\nu_{g,n}\right),

and, for 1jdk1\leq j\leq d_k,

(v1ρ(x))k,j;i=dj1dzj1(exp(1Φk(zi(x)))zi(x)zexp(2g2+n>02g2+nn!zzi(x)zzi(x)νg,n))z=βk.\left(v^{-1}\rho(x)\right)_{k,j;i}=\left.\frac{d^{j-1}}{dz'^{j-1}}\left(\frac{\exp\left(\hbar^{-1}\Phi_k(z^i(x))\right)}{z^i(x)-z'}\exp\left(\sum_{2g-2+n>0}\frac{\hbar^{2g-2+n}}{n!}\int_{z'}^{z^i(x)}\cdots\int_{z'}^{z^i(x)}\nu_{g,n}\right)\right)\right|_{z'=\beta_k}.

This conjecture proposes a reconstruction of the solution of the differential system from the topological-recursion correlation functions, extending the established direction from the solution to topological recursion. The source gives no resolution status for the reconstruction formulas, so their general validity remains open.

Sources & referencesView supporting material

Primary source

Raphaël Belliard, Bertrand Eynard and Olivier Marchal, “Integrable differential systems of topological type and reconstruction by the topological recursion”, arXiv:1610.00496 (2017).

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