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arXiv · 2005.09924

Some properties of stationary continuous state branching processes

Romain Abraham·Jean-François Delmas·Hui He
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Abstract

We consider the genealogical tree of a stationary continuous state branching process with immigration. For a sub-critical stable branching mechanism, we consider the genealogical tree of the extant population at some fixed time and prove that, up to a deterministic time-change, it is distributed as a continuous-time Galton-Watson process with immigration. We obtain similar results for a critical stable branching mechanism when only looking at immigrants arriving in some fixed time-interval. For a general sub-critical branching mechanism, we consider the number of individuals that give descendants in the extant population. The associated processes (forward or backward in time) are pure-death or pure-birth Markov processes, for which we compute the transition rates.

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Romain Abraham, Jean-François Delmas, Hui He. 2020-05-20. Some properties of stationary continuous state branching processes. https://arxiv.org/abs/2005.09924

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