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Annales de l'Institut Henri Poincaré (B) Probabilités et Statistiques 48, 3 (2012) 688-705
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Pruning Galton-Watson Trees and Tree-valued Markov Processes
Romain Abraham 1, Jean-François Delmas 2, Hui He 1, 3
(2012)

We present a new pruning procedure on discrete trees by adding marks on the nodes of trees. This procedure allows us to construct and study a tree-valued Markov process $\{ {\cal G}(u)\}$ by pruning Galton-Watson trees and an analogous process $\{{\cal G}^*(u)\}$ by pruning a critical or subcritical Galton-Watson tree conditioned to be infinite. Under a mild condition on offspring distributions, we show that the process $\{{\cal G}(u)\}$ run until its ascension time has a representation in terms of $\{{\cal G}^*(u)\}$. A similar result was obtained by Aldous and Pitman (1998) in the special case of Poisson offspring distributions where they considered uniform pruning of Galton-Watson trees by adding marks on the edges of trees.
1 :  Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO)
Université d'Orléans – CNRS : UMR7349
2 :  Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique (CERMICS)
Ecole des Ponts ParisTech
3 :  School of Mathematical Sciences
Beijing Normal University / Beijing
Mathématiques/Probabilités
Branching process – Galton-Watson process – random tree – ascension process
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