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arXiv 1408.2202math.PR
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多元缺项系统的极限定理

Limit Theorems for Multivariate Lacunary Systems

Thomas Löbbe

摘要:

周期函数$f$和快速增长矩阵序列$(M_n)_{n\geq 1}$的$(f(M_nx))_{n\geq 1}$型缺项函数系统具有独立随机变量的许多性质,如满足中心极限定理或重对数律.众所周知,这种行为取决于$(M_n)_{n\geq 1}$的数论性质以及$f$的分析性质。经典的技术基本上是基于傅立叶分析,使得它几乎不可能使用类似的方法在多变量设置。最近Aistleitner和Berkes介绍了一种新的方法,在一维情形下证明了中心极限定理,即用构成鞅差序列的分段常数周期函数之和逼近$\sum_{n}f(M_nx)$,并利用Berry-Esseen型不等式.后来这种方法被用来显示法律的迭代对数的后果斯特拉森的几乎肯定不变原理。本文将这种方法推广到多维情形下证明中心极限定理和重对数律。

英文摘要:

Lacunary function systems of type $(f(M_nx))_{n\geq 1}$ for periodic functions $f$ and sequences of fast-growing matrices $(M_n)_{n\geq 1}$ exhibit many properties of independent random variables like satisfying the Central Limit Theorem or the Law of the Iterated Logarithm. It is well-known that this behaviour depends on number theoretic properties of $(M_n)_{n\geq 1}$ as well as analytic properties of $f$. Classical techniques are essentially based on Fourier analysis making it almost impossible to use a similar approach in the multivariate setting. Recently Aistleitner and Berkes introduced a new method proving the Central Limit Theorem in the one-dimensional case by approximating $\sum_{n}f(M_nx)$ by a sum of piecewise constant periodic functions which form a martingale differences sequence and using a Berry-Esseen type inequality. Later this approach was used to show the Law of the Iterated Logarithm by a consequence of Strassen's almost sure invariance principle. In this paper we develop this method to prove the Central Limit Theorem and the Law of the Iterated Logarithm in the multidimensional case.

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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