The Laplace–Beltrami correspondence for b-deformed Jucys–Murphy operators

Let kk be a positive integer, let ZVk\mathcal{Z}\mathcal{V}_k be the coset-type-constant subspace, let pλ\mathfrak{p}_\lambda be the bb-deformed class vector for λk\lambda\vdash k, and let ch(b)\operatorname{ch}^{(b)} be the bb-deformed Frobenius characteristic map. Let D(b)D(b) denote the Laplace–Beltrami operator. Laplace–Beltrami correspondence conjecture. For every partition λk\lambda\vdash k,

ch(b)((J1+J2++Jk)pλ)=D(b)ch(b)(pλ).\operatorname{ch}^{(b)}\big((\mathcal{J}_1+\mathcal{J}_2+\cdots+\mathcal{J}_k)\cdot\mathfrak{p}_\lambda\big)=D(b)\cdot\operatorname{ch}^{(b)}(\mathfrak{p}_\lambda).

This conjecture seeks to identify the sum of the deformed Jucys–Murphy operators, after applying the characteristic map, with the Laplace–Beltrami operator whose eigenfunctions are Jack symmetric functions. It is motivated by the classical correspondence for symmetric groups and is unresolved.

Sources & referencesView supporting material

Primary source

Xavier Coulter and Norman Do, “From Weingarten calculus for real Grassmannians to deformations of monotone Hurwitz numbers and Jucys-Murphy elements”, arXiv:2506.04002 (2025).

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