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arXiv 1406.0969math.CAmath.CV
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关于Bessel函数正交多项式的渐近性态和零点分布

Asymptotic behavior and zero distribution of polynomials orthogonal with respect to Bessel functions

Alfredo Deaño, Arno B. J. Kuijlaars, Pablo Román

摘要:

我们考虑多项式$P_n$关于$[0,\infty)$上的权重$J_ν$正交,其中$J_ν$是阶为$ν$的贝塞尔函数。Asheim和Huybrechs认为这些多项式与复高斯正交振荡积分。他们观察到零是复数,并在垂直线$\textrm{Re}\, z = \frac{νπ}{2}$附近积累为$n \to \infty$。我们证明这一事实的情况下$0 \leq ν\leq 1/2$从强渐近公式,我们推导出多项式$P_n$在复平面。我们的主要工具是正交多项式的黎曼-希尔伯特问题,适当修改,以涵盖目前的情况,和Deift-Zhou最速下降法。工作的一个主要部分是致力于建设一个本地参数的起源,我们给出了一个存在性证明,只适用于$ν\leq 1/2$。

英文摘要:

We consider polynomials $P_n$ orthogonal with respect to the weight $J_ν$ on $[0,\infty)$, where $J_ν$ is the Bessel function of order $ν$. Asheim and Huybrechs considered these polynomials in connection with complex Gaussian quadrature for oscillatory integrals. They observed that the zeros are complex and accumulate as $n \to \infty$ near the vertical line $\textrm{Re}\, z = \frac{νπ}{2}$. We prove this fact for the case $0 \leq ν\leq 1/2$ from strong asymptotic formulas that we derive for the polynomials $P_n$ in the complex plane. Our main tool is the Riemann-Hilbert problem for orthogonal polynomials, suitably modified to cover the present situation, and the Deift-Zhou steepest descent method. A major part of the work is devoted to the construction of a local parametrix at the origin, for which we give an existence proof that only works for $ν\leq 1/2$.

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