On the Height Profile of a Conditioned Galton-Watson Tree

Details On the Height Profile of a Conditioned Galton-Watson Tree On the Height Profile of a Conditioned Galton-Watson Tree

2011-01-19

arxiv.org/abs/1101.3656v1

Mathematics

Probability

24 pages

Scientific paper

Drmota and Gittenberger (1997) proved a conjecture due to Aldous (1991) on the height profile of a Galton-Watson tree with an offspring distribution of finite variance, conditioned on a total size of $n$ individuals. The conjecture states that in distribution its shape, more precisely its scaled height profile coincides asymptotically with the local time process of a Brownian excursion of duration 1. We give a proof of the result, which extends to the case of an infinite variance offspring distribution. This requires a different strategy, since in the infinite variance case there is no longer a relationship to the local time of Brownian resp. L\'{e}vy excursions.

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