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arXiv 2102.06541math.PR
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Lévy(-型)过程样本轨道的上函数

Upper functions for sample paths of Lévy(-type) processes

Franziska Kühn

摘要:

研究了Lévy过程和Lévy型过程样本路径的小时间渐近性。也就是说,我们分别研究了极限$$\limsup_{t \to 0} \frac{1}{f(t)} |X_t-X_0|$$在什么条件下是有限的。概率为$1$。根据过程的无穷小特征和过程的符号建立了积分准则。我们的结果适用于广泛的一类过程,包括解决方案Lévy驱动的随机微分方程和稳定的过程。对于Lévy过程的特殊情况,我们恢复并扩展了文献中的早期结果。此外,我们还对Lévy型过程给出了一个新的极大不等式,这是一个独立的结果.

英文摘要:

We study the small-time asymptotics of sample paths of Lévy processes and Lévy-type processes. Namely, we investigate under which conditions the limit $$\limsup_{t \to 0} \frac{1}{f(t)} |X_t-X_0|$$ is finite resp.\ infinite with probability $1$. We establish integral criteria in terms of the infinitesimal characteristics and the symbol of the process. Our results apply to a wide class of processes, including solutions to Lévy-driven SDEs and stable-like processes. For the particular case of Lévy processes, we recover and extend earlier results from the literature. Moreover, we present a new maximal inequality for Lévy-type processes, which is of independent interest.

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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