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arXiv math/0605417math.PR
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$L_q$ --空间中高斯随机场的小偏差

Small Deviations of Gaussian Random Fields in $L_q$--Spaces

Mikhail Lifshits, Werner Linde, Zhan Shi

摘要:

研究了空间$L_q(\R^N,μ)$中高斯随机场的小偏差性质,其中$μ$是任意有限紧支撑Borel测度.在此特别感兴趣的是“薄”度量$μ$,即,关于$N$的奇异测度--维勒贝格测度,所谓的自相似测度提供了一类典型的例子。对于一个大类的随机场(包括,除其他外,分数布朗运动),我们描述的行为小偏差概率通过数值特性的$μ$,称为混合熵,表征大小和规律性的$μ$。对于特别有趣的情况下,自相似措施$μ$,混合熵的渐近行为明确评估。由此得到了$N$ -参数分数布朗运动关于$L_q(\R^N,μ)$-范数的小偏差的渐近性.小偏差概率的上界估计是用纯概率方法证明的,而下界则是用与Kolmogorov数和Hölder算子熵数有关的分析工具建立的.

英文摘要:

We investigate small deviation properties of Gaussian random fields in the space $L_q(\R^N,μ)$ where $μ$ is an arbitrary finite compactly supported Borel measure. Of special interest are hereby "thin" measures $μ$, i.e., those which are singular with respect to the $N$--dimensional Lebesgue measure; the so--called self--similar measures providing a class of typical examples. For a large class of random fields (including, among others, fractional Brownian motions), we describe the behavior of small deviation probabilities via numerical characteristics of $μ$, called mixed entropy, characterizing size and regularity of $μ$. For the particularly interesting case of self--similar measures $μ$, the asymptotic behavior of the mixed entropy is evaluated explicitly. As a consequence, we get the asymptotic of the small deviation for $N$--parameter fractional Brownian motions with respect to $L_q(\R^N,μ)$--norms. While the upper estimates for the small deviation probabilities are proved by purely probabilistic methods, the lower bounds are established by analytic tools concerning Kolmogorov and entropy numbers of Hölder operators.

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