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arXiv 1107.2874math.PR
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空间分式泊松过程

The Space-Fractional Poisson Process

Enzo Orsingher, Federico Polito

摘要:

本文引入了空间分数泊松过程,其状态概率$p_k^α(t)$,$t>0$,$α\in (0,1]$由方程$(\mathrm d/\mathrm dt)p_k(t) = -λ^α(1-B)p_k^α(t)$控制,其中$(1-B)^α$是在时间序列分析研究中发现的分数差分算子.我们明确地得到了分布$p_k^α(t)$,概率母函数$G_α(u,t)$,它们也被表示为i.i.d.的最小值的分布。均匀随机变量与时间分数泊松过程进行了比较,最后得到了更一般的时空分数泊松过程,并给出了它的分布.

英文摘要:

In this paper we introduce the space-fractional Poisson process whose state probabilities $p_k^α(t)$, $t>0$, $α\in (0,1]$, are governed by the equations $(\mathrm d/\mathrm dt)p_k(t) = -λ^α(1-B)p_k^α(t)$, where $(1-B)^α$ is the fractional difference operator found in the study of time series analysis. We explicitly obtain the distributions $p_k^α(t)$, the probability generating functions $G_α(u,t)$, which are also expressed as distributions of the minimum of i.i.d.\ uniform random variables. The comparison with the time-fractional Poisson process is investigated and finally, we arrive at the more general space-time fractional Poisson process of which we give the explicit distribution.

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