Linear and quadratic loop equations for the quartic Kontsevich model

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Let R:C^→C^R:\widehat{\mathbb{C}}\to\widehat{\mathbb{C}} be the ramified covering defined by the model, let β1,…,β2d\beta_1,\ldots,\beta_{2d} be its ramification points, and let σi\sigma_i be the corresponding local Galois involution near βi\beta_i. Define ω0,1(z)=−R(−z)R′(z) dz\omega_{0,1}(z)=-R(-z)R'(z)\,dz and ω0,2(u1,z)=du1 dz(u1−z)2+du1 dz(u1+z)2\omega_{0,2}(u_1,z)=\frac{du_1\,dz}{(u_1-z)^2}+\frac{du_1\,dz}{(u_1+z)^2}; for 2−2g−m<02-2g-m<0, define ωg,m\omega_{g,m} by the stated residue system. Loop-equation conjecture. For all g≥0g\geq0 and m≥1m\geq1, the meromorphic differentials ωg,m\omega_{g,m} are symmetric and satisfy, near every βi\beta_i, the linear loop equation

ωg,m(u1,…,um−1,z)+ωg,m(u1,…,um−1,σi(z))=O(z−βi) dz\omega_{g,m}(u_1,\ldots,u_{m-1},z)+\omega_{g,m}(u_1,\ldots,u_{m-1},\sigma_i(z))=\mathcal{O}(z-\beta_i)\,dz

and the quadratic loop equation

ωg−1,m+1(u1,…,um−1,z,σi(z))+∑I1⊎I2={u1,…,um−1}\g1+g2=gωg1,∣I1∣+1(I1,z)ωg2,∣I2∣+1(I2,σi(z))=O((z−βi)2)(dz)2.\omega_{g-1,m+1}(u_1,\ldots,u_{m-1},z,\sigma_i(z))+\sum_{\substack{I_1\uplus I_2=\{u_1,\ldots,u_{m-1}\}\g_1+g_2=g}}\omega_{g_1,|I_1|+1}(I_1,z)\omega_{g_2,|I_2|+1}(I_2,\sigma_i(z))=\mathcal{O}((z-\beta_i)^2)(dz)^2.

The claim is motivated by the verified low-degree cases and would establish the loop-equation structure underlying blobbed topological recursion for the quartic model; the general assertion remains open in the supplied text.

References

Primary source

Johannes Branahl, Alexander Hock and Raimar Wulkenhaar, “Blobbed topological recursion of the quartic Kontsevich model I: Loop equations and conjectures”, arXiv:2008.12201 (2022).

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