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arXiv 2301.05992math.PR
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二次非负高斯多项式反集中性的初等证明

An elementary proof of anti-concentration for degree two non-negative Gaussian polynomials

Stephen Tu, Ross Boczar

摘要:

Carbery和Wright的一个经典结果表明,高斯随机变量的多项式在以下意义上表现出反集中:对于任何次数的$d$多项式$f$,人们都有估计值$P( |f(x)| \leq \varepsilon \cdot E|f(x)| ) \leq O(1) \cdot d \varepsilon^{1/d}$,其中概率超过从各向同性高斯分布得出的$x$。本文对$f$为二次非负多项式的特殊情形给出了这个结果的初等证明。

英文摘要:

A classic result by Carbery and Wright states that a polynomial of Gaussian random variables exhibits anti-concentration in the following sense: for any degree $d$ polynomial $f$, one has the estimate $P( |f(x)| \leq \varepsilon \cdot E|f(x)| ) \leq O(1) \cdot d \varepsilon^{1/d}$, where the probability is over $x$ drawn from an isotropic Gaussian distribution. In this note, we give an elementary proof of this result for the special case when $f$ is a degree two non-negative polynomial.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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