arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0601774math.PR
收藏

过程的泛函量子化率和平均正则性及其在Lévy过程中的应用

Functional quantization rate and mean regularity of processes with an application to Lévy processes

Harald Luschgy, Gilles Pagès

摘要:

研究了取值于L^p([0,T],dt)-空间(0 < p <= r)的随机变量的随机过程的平均路径正则性与L^r(P)-泛函量子化率之间的关系.我们的主要工具是Haar基础。然后我们强调,导出的函数量化率可以是最优的(例如,对于布朗运动或对称稳定过程),使得速率作为通用上界是最优的。作为第一个应用,我们建立了包含多维扩散的一般Itô过程的O((logN)^{-1/2})上界.然后,我们专注于特定的家庭的Lévy过程,我们推导出一个一般的量化率的基础上,其Lévy措施在0的定期变化的性质。特别研究了复合Poisson过程的情形,它在前一种方法中表现为退化的,我们观察到一些介于有限维和无限维“通常”速率之间的速率

英文摘要:

We investigate the connections between the mean pathwise regularity of stochastic processes and their L^r(P)-functional quantization rates as random variables taking values in some L^p([0,T],dt)-spaces (0 < p <= r). Our main tool is the Haar basis. We then emphasize that the derived functional quantization rate may be optimal (e.g., for Brownian motion or symmetric stable processes) so that the rate is optimal as a universal upper bound. As a first application, we establish the O((log N)^{-1/2}) upper bound for general Itô processes which include multidimensional diffusions. Then, we focus on the specific family of Lévy processes for which we derive a general quantization rate based on the regular variation properties of its Lévy measure at 0. The case of compound Poisson processes, which appear as degenerate in the former approach, is studied specifically: we observe some rates which are between the finite-dimensional and infinite-dimensional ``usual'' rates

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。

↑