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arXiv 0808.3755math.PR
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具有Markov运动的亚临界分枝移民系统的占领时间

Occupation times of subcritical branching immigration system with Markov motions

Piotr Milos

摘要:

我们考虑一个分支系统的粒子运动根据一个马尔可夫家庭在$\Rd$和经历亚临界分支与恒定速率$V>0$。新粒子按照齐性空间-时间泊松随机场随机场向系统迁移。在马尔可夫族的假设下,研究了重标占有时间的涨落过程。在此一般性条件下,证明了一个泛函中心极限定理.分支律的亚临界性对于极限行为是至关重要的,并且在某种意义上描述了粒子运动的性质。正是由于这个原因,极限对于所有维度都是相同的,并且可以对广泛的一类马尔可夫过程获得。另一个结果是极限$\SP$值Wiener过程的形式,具有简单的时间结构和复杂的空间结构。这种行为与临界分支系统的情况形成鲜明对比。

英文摘要:

We consider a branching system consisting of particles moving according to a Markov family in $\Rd$ and undergoing subcritical branching with a constant rate $V>0$. New particles immigrate to the system according to homogeneous space-time Poisson random field. The process of the fluctuations of the rescaled occupation time is studied with very mild assumptions on the Markov family. In this general setting a functional central limit theorem is proved. The subcriticality of the branching law is crucial for the limit behaviour and in a sense overwhelms the properties of the particles' motion. It is for this reason that the limit is the same for all dimensions and can be obtained for a wide class of Markov processes. Another consequence is the form of the limit - $\SP$-valued Wiener process with a simple temporal structure and a complicated spatial one. This behaviour contrasts sharply with the case of critical branching systems.

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