Asymptotics of the allele frequency spectrum associated with the Bolthausen-Sznitman coalescent

Details Asymptotics of the allele frequency spectrum associated with the Bolthausen-Sznitman coalescent Asymptotics of the allele frequency spectrum associated with the Bolthausen-Sznitman coalescent

2007-06-19

arxiv.org/abs/0706.2808v1

Mathematics

Probability

26 pages, 1 figure

Scientific paper

We work in the context of the infinitely many alleles model. The allelic partition associated with a coalescent process started from n individuals is obtained by placing mutations along the skeleton of the coalescent tree; for each individual, we trace back to the most recent mutation affecting it and group together individuals whose most recent mutations are the same. The number of blocks of each of the different possible sizes in this partition is the allele frequency spectrum. The celebrated Ewens sampling formula gives precise probabilities for the allele frequency spectrum associated with Kingman's coalescent. This (and the degenerate star-shaped coalescent) are the only Lambda coalescents for which explicit probabilities are known, although they are known to satisfy a recursion due to Moehle. Recently, Berestycki, Berestycki and Schweinsberg have proved asymptotic results for the allele frequency spectra of the Beta(2-alpha,alpha) coalescents with alpha in (1,2). In this paper, we prove full asymptotics for the case of the Bolthausen-Sznitman coalescent.

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