On the one-sided exit problem for stable processes in random scenery

On the one-sided exit problem for stable processes in random scenery
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随机场景中稳定过程的单边退出问题

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发表时间:
2013
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通讯作者:
Bruno Schapira
Bruno Schapira
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作者:
F. Castell;N. Guillotin;F. Pène;Bruno Schapira

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本文考虑随机场景中稳定Levy过程的单边退出问题,即当T$ large时概率$$mathbb{P}Big[ sup_{tin[0,T]} Delta_t leq 1Big] $$的渐近性态,其中$$Delta_t = int_{mathbb{R}} L_t(x),dW(x)。这里$W=(W(x))xinmathbb{R}}$是一个双边的标准真实的布朗运动,$(L_t(x))xinmathbb{R},tgeq 0}$是一个稳定的Levy过程的局部时,该过程的指数为$alphain(1,2)$,与过程$ W$无关。我们的结果证实了Redner和Majumdar的一些物理学家的预测。
We consider the one-sided exit problem for stable Levy process in random scenery, that is the asymptotic behaviour for $T$ large of the probability $$mathbb{P}Big[ sup_{tin[0,T]} Delta_t leq 1Big] $$ where $$Delta_t = int_{mathbb{R}} L_t(x) , dW(x).$$ Here $W=(W(x))_{xinmathbb{R}}$ is a two-sided standard real Brownian motion and $(L_t(x))_{xinmathbb{R},tgeq 0}$ the local time of a stable Levy process with index $alphain (1,2]$, independent from the process $ W$. Our result confirms some physicists prediction by Redner and Majumdar.