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Generalized higher-order Freud weights

Clarkson, Peter, Jordaan, Kerstin, Loureiro, Ana F. (2023) Generalized higher-order Freud weights. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 479 (2272). Article Number 20220788. ISSN 1364-5021. (doi:10.1098/rspa.2022.0788) (KAR id:100979)


We discuss polynomials orthogonal with respect to a semi-classical generalised higher order Freud weight ω(x;t, λ) = |x| 2λ+1exp tx2 − x2m, x ∈ R, with parameters λ > −1, t ∈ R and m = 2, 3, . . . . The sequence of generalised higher order Freud weights for m = 2, 3, . . . , forms a hierarchy of weights, with associated hierarchies for the first moment and the recurrence coefficient. We prove that the first moment can be written as a finite partition sum of generalised hypergeometric 1Fm functions and show that the recurrence coefficients satisfy difference equations which are members of the first discrete Painleve hierarchy. We analyse the asymptotic behaviour of the recurrence coefficients and the limiting distribution of the zeros as n → ∞. We also investigate structure and other mixed recurrence relations satisfied by the polynomials and related properties.

Item Type: Article
DOI/Identification number: 10.1098/rspa.2022.0788
Subjects: Q Science > QA Mathematics (inc Computing science)
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Mathematics, Statistics and Actuarial Science
Depositing User: Peter Clarkson
Date Deposited: 19 Apr 2023 11:19 UTC
Last Modified: 04 Jul 2023 14:53 UTC
Resource URI: (The current URI for this page, for reference purposes)

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