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arXiv · 1605.08292

Asymptotic of the maximal displacement in a branching random walk

Bastien Mallein
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Abstract

In this article, we study the maximal displacement in a branching random walk. We prove that its asymptotic behaviour consists in a first almost sure ballistic term, a negative logarithmic correction in probability and stochastically bounded fluctuations. This result, proved by Addario-Berry and Reed, and Hu and Shi is given here under close-to-optimal integrability conditions. We provide simple proofs for this result, also deducing the genealogical structure of the individuals that are close to the maximal displacement.

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Bastien Mallein. 2016-05-26. Asymptotic of the maximal displacement in a branching random walk. https://arxiv.org/abs/1605.08292

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