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arXiv 1008.2145math.PRmath.STstat.TH
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分数纯生过程

Fractional pure birth processes

Enzo Orsingher, Federico Polito

摘要:

我们考虑一个分数版本的经典非线性纯生过程的Yule-Furry模型是一个特殊的情况。分数是通过取代一阶时间导数的差分微分方程,其中管理的概率与Dzherbashyan-Caputo分数导数的过程。我们推导出在任意时刻$t$个体数$\mathcal{N}_ν(t)$的概率分布。我们还提出了一个有趣的表示个人的数量在时间$t$,在从属关系的形式$\mathcal{N}_ν(t)=\mathcal{N}(T_{2ν}(t))$,其中$\mathcal{N}(t)$是经典的广义纯生过程和$T_{2ν}(t)$是一个随机时间,其分布是有关的分数扩散方程。分数线性纯生过程在第3节中详细研究,并给出和讨论其分布的各种形式。

英文摘要:

We consider a fractional version of the classical nonlinear birth process of which the Yule--Furry model is a particular case. Fractionality is obtained by replacing the first order time derivative in the difference-differential equations which govern the probability law of the process with the Dzherbashyan--Caputo fractional derivative. We derive the probability distribution of the number $\mathcal{N}_ν(t)$ of individuals at an arbitrary time $t$. We also present an interesting representation for the number of individuals at time $t$, in the form of the subordination relation $\mathcal{N}_ν(t)=\mathcal{N}(T_{2ν}(t))$, where $\mathcal{N}(t)$ is the classical generalized birth process and $T_{2ν}(t)$ is a random time whose distribution is related to the fractional diffusion equation. The fractional linear birth process is examined in detail in Section 3 and various forms of its distribution are given and discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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