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Preprints, Working Papers, ... Year : 2010

The genealogy of branching Brownian motion with absorption

Abstract

We consider a system of particles which perform branching Brownian motion with negative drift and are killed upon reaching zero, in the near-critical regime where the total population stays roughly constant with approximately N particles. We show that the characteristic time scale for the evolution of this population is of order (log N)^3, in the sense that when time is measured in these units, the scaled number of particles converges to a variant of Neveu's continuous-state branching process. Furthermore, the genealogy of the particles is then governed by a coalescent process known as the Bolthausen-Sznitman coalescent. This validates the non-rigorous predictions by Brunet, Derrida, Muller, and Munier for a closely related model.

Dates and versions

hal-00447444 , version 1 (15-01-2010)

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Julien Berestycki, Nathanael Berestycki, Jason Schweinsberg. The genealogy of branching Brownian motion with absorption. 2010. ⟨hal-00447444⟩
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