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arXiv 1306.1503math.PR
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从属子首达时间分布的渐近性

Asymptotic behaviour of first passage time distributions for subordinators

Ronald A. Doney, Victor Rivero

摘要:

在本文中,我们建立了局部估计的第一次通过时间的从属的假设下,它属于Feller类,无论是在零或无穷大,作为一个特殊的情况下,从属的吸引区域的稳定分布,无论是在零或无穷大。为了得到这些结果,我们首先得到这样一个从属,锐化Jain和Pruitt在1987年获得的一维分布的均匀的局部估计。在从属子在稳定分布的吸引区域中的特殊情况下,所得结果类似于作者对非单调Lévy过程所得到的结果.对于从属过程,需要一种与非单调Lévy过程不同的方法,因为不存在偏移技术,而且通常在非单调情况下,首达时间的尾部分布有多项式下降,而在从属过程的情况下,它是指数下降。

英文摘要:

In this paper we establish local estimates for the first passage time of a subordinator under the assumption that it belongs to the Feller class, either at zero or infinity, having as a particular case the subordinators which are in the domain of attraction of a stable distribution, either at zero or infinity. To derive these results we first obtain uniform local estimates for the one dimensional distribution of such a subordinator, which sharpen those obtained by Jain and Pruitt in 1987. In the particular case of a subordinator in the domain of attraction of a stable distribution the results are the analogue of the results obtained by the authors for non-monotone Lévy processes. For subordinators an approach different to that used for non-monotone Lévy processes is necessary because the excursion techniques are not available and also because typically in the non-monotone case the tail distribution of the first passage time has polynomial decrease, while in the subordinator case it is exponential.

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