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Zbl 1193.60099
Bertoin, Jean
A limit theorem for trees of alleles in branching processes with rare neutral mutations. (English)
[J] Stochastic Processes Appl. 120, No. 5, 678-697 (2010). ISSN 0304-4149

Summary: We are interested in the genealogical structure of alleles for a Bienaymé-Galton-Watson branching process with neutral mutations (infinite alleles model), in the situation where the initial population is large and the mutation rate small. We shall establish that for an appropriate regime, the process of the sizes of the allelic sub-families converges in distribution to a certain continuous state branching process (i.e., a Jiřina process) in discrete time. Itô's excursion theory and the Lévy-Itô decomposition of subordinators provide fundamental insights for the results.

MSC 2000:: *60J80 Branching processes
60J05 Markov processes with discrete parameter

Keywords: weak convergence; branching process; neutral mutations; allelic partition; Lévy-Itô decomposition

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Zentralblatt MATH Berlin [Germany]