  Let $F_g(t)$ be the generating function of intersection numbers on the moduli
spaces $\bar{\mathcal{M}}_{g,n}$ of complex curves of genus $g$. As by-product
of a complete solution of all non-planar correlation functions of the
renormalised $\Phi^3$-matrical QFT model, we explicitly construct a Laplacian
$\Delta_t$ on the space of formal parameters $t_i$ satisfying $\exp(\sum_{g\geq
2} N^{2-2g}F_g(t))=\exp((-\Delta_t+F_2(t))/N^2)1$ for any $N>0$. The result is
achieved via Dyson-Schwinger equations from noncommutative quantum field theory
combined with residue techniques from topological recursion. The genus-$g$
correlation functions of the $\Phi^3$-matricial QFT model are obtained by
repeated application of another differential operator to $F_g(t)$ and taking
for $t_i$ the renormalised moments of a measure constructed from the covariance
of the model.
