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Branching processes in random environment with freezing

  • Ivan D. Korshunov EMAIL logo
Veröffentlicht/Copyright: 6. September 2025
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Abstract

It is well known that a branching process in random environment (BPRE) can be analyzed via the associated random walk

Sn=ξ1++ξn,

where ξk=lnφηk (1). Here {ηk}k=1 is the random environment and φx(t) is the generating function of the number of descendants of a particle for given environment x. We study the probability of extinction of a branching process in random environment with freezing: in constrast to classic BPRE, in this process every state ηk of the environment lasts for given number τk of generations. It turns out that this variant of BPRE is also closely related to a random walk

Sn=τ1ξ1++τnξn.

We find several sufficient conditions for extinction probability of such process to be one or less than one correspondingly.


Originally published in Diskretnaya Matematika (2023) 35, №3, 20–36 (in Russian).


Funding statement: The research was supported by the Russian Science Foundation under grant no. 19-11-00111-P, https://rscf.ru/project/19-11-00111/, and performed at Steklov Mathematical Institute of Russian Academy of Sciences.

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Received: 2023-06-12
Published Online: 2025-09-06
Published in Print: 2025-08-26

© 2025 Walter de Gruyter GmbH, Berlin/Boston

Heruntergeladen am 30.11.2025 von https://www.degruyterbrill.com/document/doi/10.1515/dma-2025-0018/pdf
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