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arXiv 0904.0949math.PR
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分数阶布朗运动相交局部时的正则性

Regularity of Intersection Local Times of Fractional Brownian Motions

Dongsheng Wu, Yimin Xiao

摘要:

设$B^{α_i}$是一个具有Hurst指标${α_i}$($i=1,2$)的$(N_i,d)$-分数布朗运动,且$B^{α_1}$和$B^{α_2}$相互独立.我们证明了,如果$\frac{N_1}{α_1}+\frac{N_2}{α_2}>d$,则$B^{α_1}$和$B^{α_2}$的交集局部时存在,并且有一个连续的版本.我们还建立了Hölder条件的交叉当地时间和确定的Hausdorff和包装尺寸的集合的交叉时间和交叉点。本文的主要动机之一是来自Nualart和Ortiz-Latorre({\it J. Theor.可能。} {\bf 20}(2007)),其中用不同的方法研究了具有相同Hurst指标的两个独立的$(1,d)$-分数布朗运动的相交局部时的存在性.我们的研究结果表明,各向异性带来微妙的差异到分析性质的交叉本地时间以及丰富的几何结构到集合的交叉时间和交叉点。

英文摘要:

Let $B^{α_i}$ be an $(N_i,d)$-fractional Brownian motion with Hurst index ${α_i}$ ($i=1,2$), and let $B^{α_1}$ and $B^{α_2}$ be independent. We prove that, if $\frac{N_1}{α_1}+\frac{N_2}{α_2}>d$, then the intersection local times of $B^{α_1}$ and $B^{α_2}$ exist, and have a continuous version. We also establish Hölder conditions for the intersection local times and determine the Hausdorff and packing dimensions of the sets of intersection times and intersection points. One of the main motivations of this paper is from the results of Nualart and Ortiz-Latorre ({\it J. Theor. Probab.} {\bf 20} (2007)), where the existence of the intersection local times of two independent $(1,d)$-fractional Brownian motions with the same Hurst index was studied by using a different method. Our results show that anisotropy brings subtle differences into the analytic properties of the intersection local times as well as rich geometric structures into the sets of intersection times and intersection points.

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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