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arXiv 2007.15472math.PR
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Hurst指数分数布朗运动的$L^p$一致随机游动型逼近$0 < H < \frac{1}{2}$

$L^p$ uniform random walk-type approximation for fractional Brownian motion with Hurst exponent $0 < H < \frac{1}{2}$

Alberto Ohashi, Francys A. de Souza

摘要:

本文利用嵌入在给定布朗运动上的一类连续时间随机游动,证明了具有Hurst指数的分数阶布朗运动的$0 < H < \frac{1}{2}$一致逼近.该近似通过分数布朗运动在标准布朗运动方面的路径表示来构造。对于随机游动族的跳跃的大小的任意选择$ε_k$,当$\max\{0,1-\frac{pH}{2}\}< δ< 1$,$λ\in \big(\frac{1-H}{2}, \frac{1}{2} + \frac{δ-1}{p}\big)$时,逼近方案的收敛速度是$O(ε_k^{p(1-2λ)+ 2(δ-1)})$。

英文摘要:

In this note, we prove an $L^p$ uniform approximation of the fractional Brownian motion with Hurst exponent $0 < H < \frac{1}{2}$ by means of a family of continuous-time random walks imbedded on a given Brownian motion. The approximation is constructed via a pathwise representation of the fractional Brownian motion in terms of a standard Brownian motion. For an arbitrary choice $ε_k$ for the size of the jumps of the family of random walks, the rate of convergence of the approximation scheme is $O(ε_k^{p(1-2λ)+ 2(δ-1)})$ whenever $\max\{0,1-\frac{pH}{2}\}< δ< 1$, $λ\in \big(\frac{1-H}{2}, \frac{1}{2} + \frac{δ-1}{p}\big)$.

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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