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The density of complex zeros of random sums
Journal of Approximation Theory ( IF 0.9 ) Pub Date : 2020-07-22 , DOI: 10.1016/j.jat.2020.105461
Christopher Corley , Andrew Ledoan

Let {ηj}j=0N be a sequence of independent and identically distributed random complex Gaussian variables, and let {fj(z)}j=0N be a sequence of given analytic functions that are real-valued on the real line. We prove an exact formula for the expected density of the distribution of complex zeros of the random equation j=0Nηjfj(z)=K, where KC. The method of proof employs a formula for the expected absolute value of quadratic forms of Gaussian random variables. We also obtain the limiting behaviour of the density function as N tends to infinity and provide numerical computations for the density function and empirical distributions for random sums with various choices of the functions fj(z). Finally, we study the cases when the functions fj(z) are polynomials orthogonal on the real line and the unit circle.



中文翻译:

随机和的复零的密度

{ηĴ}Ĵ=0ñ 是一系列独立且分布均匀的随机复高斯变量,并令 {FĴž}Ĵ=0ñ是在实线上实值的给定分析函数的序列。我们证明了随机方程复零的分布的预期密度的精确公式Ĵ=0ñηĴFĴž=ķ,在哪里 ķC。证明方法对高斯随机变量的二次形式的预期绝对值采用公式。我们还获得了密度函数的极限行为ñ 趋于无穷大,并为密度函数提供了数值计算,并为函数的各种选择提供了随机和的经验分布 FĴž。最后,我们研究了当功能FĴž 是在实线和单位圆上正交的多项式。

更新日期:2020-07-22
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