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Critical branching processes evolving in a unfavorable random environment

  • Vladimir A. Vatutin EMAIL logo and Elena E. Dyakonova
Published/Copyright: July 13, 2024

Abstract

Let {Zn, n = 0, 1, 2, …} be a critical branching process in a random environment, and {Sn, n = 0, 1, 2, …} be its associated random walk. It is known that if the increments of this random walk belong (without centering) to the domain of attraction of a stable law, then there exists a regularly varying at infinity sequence a1, a2, … such that conditional distributions

P(Snanx|Zn>0),x(,+),

converge weakly to the distribution of strictly positive proper random variable. In this paper we add to this result the description of the asymptotic behavior of the probability

P(Zn>0,Snφ(n)),

where φ (n) → ∞ for n → ∞ in such a way that φ (n) = o(an).


Originally published in Diskretnaya Matematika (2022) 34, №3, 20–33 (in Russian).


Funding statement: This work was supported by the Russian Science Foundation under grant №19-11-00111, https://rscf.ru/project/19-11-00111/.

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Received: 2022-06-03
Published Online: 2024-07-13
Published in Print: 2024-06-25

© 2024 Walter de Gruyter GmbH, Berlin/Boston

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