The Macdonald generalization of the Matchings-Jack conjecture

For partitions π,μ,ν\pi,\mu,\nu of the same size, let cμ,νπ(α,γ)\boldsymbol{c}^\pi_{\mu,\nu}(\alpha,\gamma) be defined by

λYuλt2n(λ)qn(λ)Jλ(α,γ)[X]Jλ(α,γ)[Y]Jλ(α,γ)[Z]j~λ(α,γ)=m0π,μ,νmumcμ,νπ(α,γ)zπ(q,t)pπ[X]pμ[Y]pν[Z],\sum_{\lambda\in\mathbb{Y}}u^{|\lambda|}t^{-2n(\lambda)}q^{n(\lambda')}\frac{{\mathfrak J}^{(\alpha,\gamma)}_\lambda[X]{\mathfrak J}^{(\alpha,\gamma)}_\lambda[Y]{\mathfrak J}^{(\alpha,\gamma)}_\lambda[Z]}{\widetilde{j}^{(\alpha,\gamma)}_\lambda}=\sum_{m\geq0}\sum_{\pi,\mu,\nu\vdash m}\frac{u^m\boldsymbol{c}^\pi_{\mu,\nu}(\alpha,\gamma)}{z_\pi(q,t)}p_\pi[X]p_\mu[Y]p_\nu[Z],

where j~λ(α,γ)=γ2λjλ(q,t)=Jλ(α,γ),Jλ(α,γ)q,t\widetilde{j}^{(\alpha,\gamma)}_\lambda=\gamma^{-2|\lambda|}j^{(q,t)}_\lambda=\langle{\mathfrak J}^{(\alpha,\gamma)}_\lambda,{\mathfrak J}^{(\alpha,\gamma)}_\lambda\rangle_{q,t}, and b:=α1b:=\alpha-1.

The Macdonald generalization of the Matchings-Jack conjecture. For any positive integer nn and partitions π,μ,ν\pi,\mu,\nu of nn,

(1+γ)n(n1)zμzνcμ,νπ(α,γ)(1+\gamma)^{n(n-1)}z_\mu z_\nu\boldsymbol{c}^\pi_{\mu,\nu}(\alpha,\gamma)

is a polynomial in bb and γ\gamma with non-negative integer coefficients. This is a Macdonald deformation of the Jack Matchings-Jack positivity conjecture, and the supplied text gives no resolution evidence.

Sources & referencesView supporting material

Primary source

Houcine Ben Dali and Michele D'Adderio, “Macdonald characters from a new formula for Macdonald polynomials”, arXiv:2404.03904 (2026).

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