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We study the correlators $W_{g,n}$ arising from Orlov-Scherbin 2-Toda tau functions with rational content-weight $G(z)$, at arbitrary values of the two sets of time parameters. Combinatorially, they correspond to generating functions of…

Combinatorics · Mathematics 2022-07-20 Valentin Bonzom , Guillaume Chapuy , Séverin Charbonnier , Elba Garcia-Failde

We prove that topological recursion applied to the spectral curve of colored HOMFLY-PT polynomials of torus knots reproduces the n-point functions of a particular partition function called the extended Ooguri-Vafa partition function. This…

Mathematical Physics · Physics 2023-02-28 Petr Dunin-Barkowski , Maxim Kazarian , Aleksandr Popolitov , Sergey Shadrin , Alexey Sleptsov

In this paper, we discuss the properties of the generating functions of spin Hurwitz numbers. In particular, for spin Hurwitz numbers with arbitrary ramification profiles, we construct the weighed sums which are given by Orlov's…

Mathematical Physics · Physics 2023-02-28 Alexander Alexandrov , Sergey Shadrin

We derive a new explicit formula in terms of sums over graphs for the $n$-point correlation functions of general formal weighted double Hurwitz numbers coming from the Kadomtsev-Petviashvili tau functions of hypergeometric type (also known…

Combinatorics · Mathematics 2022-07-14 Boris Bychkov , Petr Dunin-Barkowski , Maxim Kazarian , Sergey Shadrin

We prove the conjecture of Do and Karev that the monotone orbifold Hurwitz numbers satisfy the Chekhov-Eynard-Orantin topological recursion.

Algebraic Geometry · Mathematics 2022-08-30 Reinier Kramer , Alexandr Popolitov , Sergey Shadrin

We construct a cubic cut-and-join operator description for the partition function of the Chekhov-Eynard-Orantin topological recursion for a local spectral curve with simple ramification points. In particular, this class contains partition…

Mathematical Physics · Physics 2025-01-16 Alexander Alexandrov

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.…

Algebraic Geometry · Mathematics 2025-02-20 Alexander Alexandrov

We consider the $N\times N$ Hermitian matrix model with measure $d\mu_{E,\lambda}(M)=\frac{1}{Z} \exp(-\frac{\lambda N}{4} \mathrm{tr}(M^4)) d\mu_{E,0}(M)$, where $d\mu_{E,0}$ is the Gaussian measure with covariance $\langle…

Mathematical Physics · Physics 2025-04-08 Alexander Hock , Raimar Wulkenhaar

We consider the Hurwitz Dubrovin--Frobenius manifold structure on the space of meromorphic functions on the Riemann sphere with exactly two poles, one simple and one of arbitrary order. We prove that the all genera partition function (also…

Mathematical Physics · Physics 2023-11-21 G. Carlet , J. van de Leur , H. Posthuma , S. Shadrin

We generalise a result of Kazarian regarding Kadomtsev-Petviashvili integrability for single Hodge integrals to general cohomological field theories related to Hurwitz-type counting problems or hypergeometric tau-functions. The proof uses…

Algebraic Geometry · Mathematics 2022-01-19 Reinier Kramer

We analyze Chiodo's formulas for the Chern classes related to the r-th roots of the suitably twisted integer powers of the canonical class on the moduli space of curves. The intersection numbers of these classes with psi-classes are…

Mathematical Physics · Physics 2017-08-22 Danilo Lewanski , Alexandr Popolitov , Sergey Shadrin , Dimitri Zvonkine

We prove a Givental type decomposition for partition functions that arise out of topological recursion applied to spectral curves. Copies of the Konstevich-Witten KdV tau function arise out of regular spectral curves and copies of the…

Algebraic Geometry · Mathematics 2018-12-12 Leonid Chekhov , Paul Norbury

The purpose of this article is to analyze the connection between Eynard-Orantin topological recursion and formal WKB solutions of a $\hbar$-difference equation: $\Psi(x+\hbar)=\left(e^{\hbar\frac{d}{dx}}\right) \Psi(x)=L(x;\hbar)\Psi(x)$…

Mathematical Physics · Physics 2018-01-17 Olivier Marchal

The Witten-Kontsevich theorem states that a certain generating function for intersection numbers on the moduli space of stable curves is a tau-function for the KdV integrable hierarchy. This generating function can be recovered via the…

Mathematical Physics · Physics 2016-08-10 Norman Do , Paul Norbury

We analyze a new family of weighted double Hurwitz numbers that was introduced as a notable example in the context of the $x-y$ duality for logarithmic topological recursion. We use this family to systematically demonstrate, refine and…

Algebraic Geometry · Mathematics 2026-05-19 Alexander Alexandrov , Boris Bychkov , Petr Dunin-Barkowski , Maxim Kazarian , Sergey Shadrin

Multiparametric families of hypergeometric $\tau$-functions of KP or Toda type serve as generating functions for weighted Hurwitz numbers, providing weighted enumerations of branched covers of the Riemann sphere. A graphical interpretation…

Mathematical Physics · Physics 2019-07-02 A. Alexandrov , G. Chapuy , B. Eynard , J. Harnad

We prove quasi-polynomiality for monotone and strictly monotone orbifold Hurwitz numbers. The second enumerative problem is also known as enumeration of a special kind of Grothendieck's dessins d'enfants or $r$-hypermaps. These statements…

Combinatorics · Mathematics 2019-07-15 Reinier Kramer , Danilo Lewanski , Sergey Shadrin

Okounkov's generating function of the double Hurwitz numbers of the Riemann sphere is a hypergeometric tau function of the 2D Toda hierarchy in the sense of Orlov and Scherbin. This tau function turns into a tau function of the lattice KP…

Mathematical Physics · Physics 2022-03-16 Kanehisa Takasaki

The KP and 2D Toda tau-functions of hypergeometric type that serve as generating functions for weighted single and double Hurwitz numbers are related to the topological recursion programme. A graphical representation of such weighted…

Mathematical Physics · Physics 2021-03-04 A. Alexandrov , G. Chapuy , B. Eynard , J. Harnad

We consider the Dubrovin--Frobenius manifold of rank $2$ whose genus expansion at a special point controls the enumeration of a higher genera generalization of the Catalan numbers, or, equivalently, the enumeration of maps on surfaces,…

Mathematical Physics · Physics 2021-06-01 G. Carlet , J. van de Leur , H. Posthuma , S. Shadrin
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