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arXiv 0909.2929math.PR
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稳定Lévy环境中扩散的局部时

Local time of a diffusion in a stable Lévy environment

Roland Diel, Guillaume Voisin

摘要:

我们考虑一个稳定的Lévy环境中的一维扩散。我们表明,归一化的本地时间过程重新聚焦在底部的标准谷与高度$\log t$,$(L_X(t,\mathfrak m_{\log t}+x)/t,x\in \R)$,收敛于法律的功能两个独立的Lévy过程的条件保持积极的。为了证明这个结果,我们证明了标准谷的定律接近于一个条件为保持正的双边Lévy过程。我们还得到了正规化局部时的上确界的极限律。这个结果是由Andreoletti和Diel在布朗环境下得到的。

英文摘要:

We consider a one-dimensional diffusion in a stable Lévy environment. We show that the normalized local time process refocused at the bottom of the standard valley with height $\log t$, $(L_X(t,\mathfrak m_{\log t}+x)/t,x\in \R)$, converges in law to a functional of two independent Lévy processes conditioned to stay positive. To prove this result, we show that the law of the standard valley is close to a two-sided Lévy process conditioned to stay positive. We also obtain the limit law of the supremum of the normalized local time. This result has been obtained by Andreoletti and Diel in the case of a Brownian environment.

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