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2013 A note on stable point processes occurring in branching Brownian motion
Pascal Maillard
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Electron. Commun. Probab. 18: 1-9 (2013). DOI: 10.1214/ECP.v18-2390


We call a point process $Z$ on $\mathbb R$ exp-1-stable if for every $\alpha,\beta\in\mathbb R$ with $e^\alpha+e^\beta=1$, $Z$ is equal in law to $T_\alpha Z+T_\beta Z'$, where $Z'$ is an independent copy of $Z$ and $T_x$ is the translation by $x$. Such processes appear in the study of the extremal particles of branching Brownian motion and branching random walk and several authors have proven in that setting the existence of a point process $D$ on $\mathbb R$ such that $Z$ is equal in law to $\sum_{i=1}^\infty T_{\xi_i} D_i$, where $(\xi_i)_{i\ge1}$ are the atoms of a Poisson process of intensity $e^{-x}\,\mathrm d x$ on $\mathbb R$ and $(D_i)_{i\ge 1}$ are independent copies of $D$ and independent of $(\xi_i)_{i\ge1}$. In this note, we show how this decomposition follows from the classic LePage decomposition of a (union)-stable point process. Moreover, we give a short proof of it in the general case of random measures on $\mathbb R$.


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Pascal Maillard. "A note on stable point processes occurring in branching Brownian motion." Electron. Commun. Probab. 18 1 - 9, 2013.


Accepted: 16 January 2013; Published: 2013
First available in Project Euclid: 7 June 2016

zbMATH: 1320.60116
MathSciNet: MR3019668
Digital Object Identifier: 10.1214/ECP.v18-2390

Primary: 60G55
Secondary: 60G57


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