Exponential rate of almost sure convergence of intrinsic martingales in supercritical branching random walks

Details Exponential rate of almost sure convergence of intrinsic martingales in supercritical branching random walks Exponential rate of almost sure convergence of intrinsic martingales in supercritical branching random walks

2009-10-22

arxiv.org/abs/0910.4246v1

J. Appl. Probab. 47 (2010), no. 2, 513-525

Mathematics

Probability

1 figure

Scientific paper

We provide sufficient conditions which ensure that the intrinsic martingale in the supercritical branching random walk converges exponentially fast to its limit. The case of Galton-Watson processes is particularly included so that our results can be seen as a generalization of a result given in the classical treatise by Asmussen and Hering. As an auxiliary tool, we prove ultimate versions of two results concerning the exponential renewal measures which may be interesting on its own and which correct, generalize and simplify some earlier works.

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