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arXiv math/0607041math.PR
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高斯场最大值分布的一般表达式及尾的近似

A general expression for the distribution of the maximum of a Gaussian field and the approximation of the tail

Jean-Marc Azaïs Mario Wschebor

摘要:

研究了定义在具有一定几何正则性的$\R^d$的紧子集上的光滑高斯场的最大值的概率分布$F(u)$.我们的主要结果是$F$密度的一般公式。尽管这是一个隐式公式,但可以从中推导出密度的显式边界,从而推导出分布的显式边界,以及$u$的大值的$ 1-F(u)$的改进展开式。主要工具是实数上随机方程组根的个数的矩的Rice公式,并给出了一个新的简化证明。这种方法也使得研究所谓的期望欧拉示性数近似的二阶性质仅使用基本参数,并将这些结果推广到一些有趣的类高斯场。利用GOE随机矩阵的谱理论,我们用“直接法“计算最大值的分布,得到了更精确的结果。

英文摘要:

We study the probability distribution $F(u)$ of the maximum of smooth Gaussian fields defined on compact subsets of $\R^d$ having some geometric regularity. Our main result is a general formula for the density of $F$. Even though this is an implicit formula, one can deduce from it explicit bounds for the density, hence for the distribution, as well as improved expansions for $ 1-F(u)$ for large values of $u$. The main tool is the Rice formula for the moments of the number of roots of a random system of equation over the reals, of which we give a new simplified proof. This method enables also to study second order properties of the so-called expected Euler Characteristic approximation using only elementary arguments and to extend these kind of results to some interesting classes of Gaussian fields. We obtain more precise results for the "direct method" to compute the distribution of the maximum, using spectral theory of GOE random matrices.

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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