On the recurrence coefficients for the $q$-Laguerre weight and discrete Painlevé equations

Abstract

We study the dependence of recurrence coefficients in the three-term recurrence relation for orthogonal polynomials with a certain deformation of the $q$-Laguerre weight on the degree parameter $n$. We show that this dependence is described by a discrete Painlevé equation on the family of $A_5^{(1)}$ Sakai surfaces, but this equation is different from the standard examples of discrete Painlevé equations of this type and instead is a composition of two such. This case study is a good illustration of the effectiveness of a recently proposed geometric identification scheme for discrete Painlevé equations.

arXiv comment19 pages. J. Phys. A: Math. Theor (2024)

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