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arXiv math/0602306math.PR
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条件为正的随机游动的不变原理

Invariance principles for random walks conditioned to stay positive

Francesco Caravenna, Loïc Chaumont

摘要:

设$\{S_n\}$是在稳定律$\mathcal{Y}$吸引区域中的随机游动,即存在正实数序列$(a_n)$使得$S_n/a_n$按律收敛到$\mathcal{Y}$。我们的主要结果是,重新标度的过程$(S_{\lfloor nt\rfloor}/a_n, t\ge 0)$,当条件保持积极的,收敛于法律(在功能意义上)向相应的稳定Lévy过程条件保持积极的。在一些额外的假设下,我们还证明了一个相关的不变原理的随机游动在其第一个入口处的负半线和条件死亡零。

英文摘要:

Let $\{S_n\}$ be a random walk in the domain of attraction of a stable law $\mathcal{Y}$, i.e. there exists a sequence of positive real numbers $(a_n)$ such that $S_n/a_n$ converges in law to $\mathcal{Y}$. Our main result is that the rescaled process $(S_{\lfloor nt\rfloor}/a_n, t\ge 0)$, when conditioned to stay positive, converges in law (in the functional sense) towards the corresponding stable Lévy process conditioned to stay positive. Under some additional assumptions, we also prove a related invariance principle for the random walk killed at its first entrance in the negative half-line and conditioned to die at zero.

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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