A limit theorem for trees of alleles in branching processes with rare neutral mutations

Details A limit theorem for trees of alleles in branching processes with rare neutral mutations A limit theorem for trees of alleles in branching processes with rare neutral mutations

2009-04-03

arxiv.org/abs/0904.0581v2

Mathematics

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We are interested in the genealogical structure of alleles for a Bienaym\'e-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 Jirina process) in discrete time. It\^o's excursion theory and the L\'eevy-It\^o decomposition of subordinators provide fundamental insights for the results.

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