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arXiv 1105.0657math.PRmath-phmath.MP
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时变Poisson过程

Time-Changed Poisson Processes

A. Kumar, Erkan Nane, P. Vellaisamy

摘要:

考虑时变Poisson过程,导出了控制该过程的差分微分方程。特别地,我们考虑了时变为逆高斯的时变Poisson过程或其首中时过程,并讨论了支配DDE。稳定从属子、逆稳定从属子及其迭代形式也被认为是时变的。得到了这些时变过程的概率质量函数所对应的DDE。最后,当$β$是有理数时,得到了指标$0<β<1,$的调和稳定从属算子的一个新的控制偏微分方程.利用这一结果得到了时变泊松过程的质量函数在回火稳定从属子作用下的控制DDE。我们的结果在几个方向上扩展和补充了Baeumer等人的\cite{B-M-N}和Beghin等人的\cite{BO-1}的结果。

英文摘要:

We consider time-changed Poisson processes, and derive the governing difference-differential equations (DDE) these processes. In particular, we consider the time-changed Poisson processes where the the time-change is inverse Gaussian, or its hitting time process, and discuss the governing DDE's. The stable subordinator, inverse stable subordinator and their iterated versions are also considered as time-changes. DDE's corresponding to probability mass functions of these time-changed processes are obtained. Finally, we obtain a new governing partial differential equation for the tempered stable subordinator of index $0<β<1,$ when $β$ is a rational number. We then use this result to obtain the governing DDE for the mass function of Poisson process time-changed by tempered stable subordinator. Our results extend and complement the results in Baeumer et al. \cite{B-M-N} and Beghin et al. \cite{BO-1} in several directions.

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