The external lengths in Kingman's coalescent

Details The external lengths in Kingman's coalescent The external lengths in Kingman's coalescent

2010-04-28

arxiv.org/abs/1004.5011v2

Mathematics

Probability

Author added, new approach to the urn model, new proof of the main reversibility result

Scientific paper

In this paper we prove asymptotic normality of the total length of external branches in Kingman's coalescent. The proof uses an embedded Markov chain, which can be descriped as follows: Take an urn with n black balls. Empty it in n steps according to the rule: In each step remove a randomly chosen pair of balls and replace it by one red ball. Finally remove the last remaining ball. Then the numbers U_k, 0 \leq k \leq n, of red balls after k steps exhibits an unexpected property: (U_0,...,U_n) and (U_n,..., U_0) are equal in distribution.

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