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

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 ψ and κ classes. We interpret this relation as a symplectic invariance of the Chekhov–Eynard–Orantin topological recursion and prove this recursion for the general Θ-case.

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