Subcritical branching processes in random environment without Cramer condition

Details Subcritical branching processes in random environment without Cramer condition Subcritical branching processes in random environment without Cramer condition

2011-10-07

arxiv.org/abs/1110.1523v3

Mathematics

Probability

Scientific paper

A subcritical branching process in random environment (BPRE) is considered whose associated random walk does not satisfy the Cramer condition. The asymptotics for the survival probability of the process is investigated, and a Yaglom type conditional limit theorem is proved for the number of particles up to moment $n$ given survival to this moment. Contrary to other types of subcritical BPRE, the limiting distribution is not discrete. We also show that the process survives for a long time owing to a single big jump of the associate random walk accompanied by a population explosion at the beginning of the process.

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