KP integrability of triple Hodge integrals. III. Cut-and-join description, KdV reduction, and topological recursions (2108.10023v2)

Abstract: In this paper, we continue our investigation of the triple Hodge integrals satisfying the Calabi-Yau condition. For the tau-functions, which generate these integrals, we derive the complete families of the Heisenberg-Virasoro constraints. We also construct several equivalent versions of the cut-and-join operators. These operators describe the algebraic version of topological recursion. For the specific values of parameters associated with the KdV reduction, we prove that these tau-functions are equal to the generating functions of intersection numbers of $\psi$ and $\kappa$ classes. We interpret this relation as a symplectic invariance of the Chekhov--Eynard--Orantin topological recursion and prove this recursion for the general $\Theta$-case.