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arXiv 2211.13645math.CAmath-phmath.MPnlin.SI
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广义高阶 Freud 权函数

Generalised higher-order Freud weights

Peter A. Clarkson, Kerstin Jordaan, Ana Loureiro

AI总结:

本文研究半经典广义高阶 Freud 权函数下的正交多项式,给出第一矩的 _1F_m 有限分拆和表示,证明递推系数属于第一离散 Painlevé 层级,并分析其渐近、零点分布及递推结构。

摘要:

我们讨论关于半经典广义高阶 Freud 权函数 ω(x;t,λ)=|x|^{2λ+1}exp(tx²−x^{2m})(x∈R)正交的多项式,其中参数 λ>−1、t∈R,且 m=2,3,…。m=2,3,… 时的广义高阶 Freud 权函数序列构成一个权函数层级,并具有关于第一矩和递推系数的相应层级。我们证明第一矩可写成广义超几何 _1F_m 函数的有限分拆和,并表明递推系数满足属于第一离散 Painlevé 层级的差分方程。我们分析了当 n→∞ 时递推系数的渐近行为和零点的极限分布。我们还研究了这些多项式满足的结构及其他混合递推关系,以及相关性质。

英文摘要:

We discuss polynomials orthogonal with respect to a semi-classical generalised higher order Freud weight \[ω(x;t,λ)=|x|^{2λ+1}\exp\left(tx^2-x^{2m}\right),\qquad x\in\mathbb{R},\] with parameters $λ> -1$, $t\in\mathbb{R}$ and $m=2,3,\dots$\ . The sequence of generalised higher order Freud weights for $m=2,3,\dots$, 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 $_1F_m$ functions and show that the recurrence coefficients satisfy difference equations which are members of the first discrete Painlevé hierarchy. We analyse the asymptotic behaviour of the recurrence coefficients and the limiting distribution of the zeros as $n \to \infty$. We also investigate structure and other mixed recurrence relations satisfied by the polynomials and related properties.

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