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Moments of discrete orthogonal polynomial ensembles
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We obtain factorial moment identities for the Charlier, Meixner and Krawtchouk orthogonal polynomial ensembles. Building on earlier results by Ledoux [Elect. J. Probab. 10, (2005)], we find hypergeometric representations for the factorial moments when the reference measure is Poisson (Charlier ensemble) and geometric (a particular case of the Meixner ensemble). In these cases, if the number of particles is suitably randomised, the factorial moments have a polynomial property, and satisfy three-term recurrence relations and differential equations. In particular, the normalised factorial moments of the randomised ensembles are precisely related to the moments of the corresponding equilibrium measures. We also briefly outline how these results can be interpreted as Cauchy-type identities for certain Schur measures.
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Linear Differential Equations for the Resolvents of the Classical Matrix Ensembles
The spectral densities of the Gaussian, Laguerre, and Jacobi β-ensembles satisfy explicit linear differential equations of order β+1, derived uniformly for β=2,4 (and Gaussian β=6,2/3).
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