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arXiv 2402.16701math.PR
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关于平稳高斯场的p-域函数的极限定理

Limit theorems for $p$-domain functionals of stationary Gaussian fields

University of Cardiff(卡迪夫大学);University of Luxembourg(卢森堡大学)

Nikolai Leonenko, Leonardo Maini, Ivan Nourdin, Francesca Pistolato

AI总结:

本文研究了平稳高斯场的p-域函数的中心极限定理和非中心极限定理,探讨了协方差函数可分离或属于Gneiting类时的条件。

摘要:

固定一个整数p≥1,称为增长域的数量。对于每个i∈{1,…,p},固定一个紧致子集D_i⊆R^{d_i},其中d_1,…,d_p≥1。令d= d_1+…+d_p为总基础维度。考虑一个连续、平稳、中心化的高斯场B=(B_x)_{x∈R^d},其方差为1。最后,令φ:R→R为一个可测函数,使得E[φ(N)^2]<∞对于N~N(0,1。在本文中,我们研究当t_1,…,t_p→∞时,形式为Y(t_1,…,t_p):=∫_{t_1D_1×…×t_pD_p}φ(B_x)dx的函数的中心极限定理和非中心极限定理。首先,我们假设B的协方差函数C是可分离的(即C=C_1⊗…⊗C_p,其中C_i:R^{d_i}→R),并深入研究在什么条件下Y(t_1,…,t_p)满足中心或非中心极限定理,当对于至少一个(或所有)i∈{1,…,p},∫_{t_iD_i}φ(B^{(i)}_{x_i})dx_i也满足相同条件时,其中B^{(i)}表示一个平稳、中心化的高斯场,定义在R^{d_i}上,具有C_i作为协方差函数。当φ是Hermite多项式时,我们还提供了一个前一结果的定量版本,这改进了A.Reveillac、M.Stauch和C.A.Tudor在《Stochastics and Dynamics》12(2012)中的一些界。其次,我们扩展我们的研究,超越可分离的情况,考察当协方差函数属于Gneiting类或可加分离时可以推断出什么。

英文摘要:

Fix an integer $p\geq 1$ and refer to it as the number of growing domains. For each $i\in\{1,\ldots,p\}$, fix a compact subset $D_i\subseteq\mathbb R^{d_i}$ where $d_1,\ldots,d_p\ge 1$. Let $d= d_1+\dots+d_{p}$ be the total underlying dimension. Consider a continuous, stationary, centered Gaussian field $B=(B_x)_{x\in \mathbb R^d}$ with unit variance. Finally, let $φ:\mathbb R \rightarrow \mathbb R$ be a measurable function such that $\mathrm E[φ(N)^2]<\infty$ for $N\sim N(0,1)$. In this paper, we investigate central and non-central limit theorems as $t_1,\ldots,t_p\to\infty$ for functionals of the form \[ Y(t_1,\dots,t_p):=\int_{t_1D_1\times\dots \times t_pD_p}φ(B_{x})dx. \] Firstly, we assume that the covariance function $C$ of $B$ is {\it separable} (that is, $C=C_1\otimes\ldots\otimes C_{p}$ with $C_i:\mathbb R^{d_i}\to\mathbb R$), and thoroughly investigate under what condition $Y(t_1,\dots,t_p)$ satisfies a central or non-central limit theorem when the same holds for $\int_{t_iD_i}φ(B^{(i)}_{x_i})dx_i$ for at least one (resp. for all) $i\in \{1,\ldots,p\}$, where $B^{(i)}$ stands for a stationary, centered, Gaussian field on $\mathbb R^{d_i}$ admitting $C_i$ for covariance function. When $φ$ is an Hermite polynomial, we also provide a quantitative version of the previous result, which improves some bounds from A. Reveillac, M. Stauch, and C. A. Tudor, Hermite variations of the fractional brownian sheet, Stochastics and Dynamics 12 (2012). Secondly, we extend our study beyond the separable case, examining what can be inferred when the covariance function is either in the Gneiting class or is additively separable.

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