Infinitely ramified point measures and branching Lévy processes

Jean Bertoin (1) , Bastien Mallein (2)

1 Institute of Mathematics University of Zurich
2 LAGA - Laboratoire Analyse, Géométrie et Applications

We call a random point measure infinitely ramified if for every n ∈ N, it has the same distribution as the n-th generation of some branching random walk. On the other hand, branching Lévy processes model the evolution of a population in continuous time, such that individuals move in space independently, according to some Lévy process, and further beget progenies according to some Poissonian dynamics, possibly on an everywhere dense set of times. Our main result connects these two classes of processes much in the same way as in the case of infinitely divisible distributions and Lévy processes: the value at time 1 of a branching Lévy process is an infinitely ramified point measure, and conversely, any infinitely ramified point measure can be obtained as the value at time 1 of some branching Lévy process.

Mots clés: Branching Levy process; characterization; branching random walk; infinitely ramified point measure

Domaines: Probabilités [math.PR]

Jean Bertoin, Bastien Mallein. Infinitely ramified point measures and branching Lévy processes. Annals of Probability, 2019, 47 (3), pp.1619-1652. ⟨10.1214/18-AOP1292⟩. ⟨hal-01689646v2⟩