{"title":"Asymptotical local probabilities of lower deviations for branching process in random environment with geometric distributions of descendants","authors":"Konstantin Yu. Denisov","doi":"10.1515/dma-2022-0026","DOIUrl":null,"url":null,"abstract":"Abstract We consider local probabilities of lower deviations for branching process Zn=Xn,1+⋯+Xn,Zn−1 ${{Z}_{n}}={{X}_{n,1}}+\\cdots +{{X}_{n,{{Z}_{n-1}}}}$in random environment η. We assume that η is a sequence of independent identically distributed random variables and for fixed environment η the distributions of variables Xi,j are geometric ones.We suppose that the associated random walk Sn=ξ1+⋯+ξn ${{S}_{n}}={{\\xi }_{1}}+\\cdots +{{\\xi }_{n}}$has positive mean μ and satisfies left-hand Cramer’s condition Eexp(hξi)<∞ if h−<h<0 $\\mathbf{E}\\exp \\left( h{{\\xi }_{i}} \\right)<\\infty \\text{ if }{{h}^{-}}<h<0$for some h−<−1. ${{h}^{-}}<-1.$Under these assumptions, we find the asymptotic representation of local probabilities P(Zn=⌊ exp(θn) ⌋) for θ∈[ θ1,θ2 ]⊂(μ−;μ) $\\mathbf{P}\\left( {{Z}_{n}}=\\left\\lfloor \\exp (\\theta n) \\right\\rfloor \\right)\\text{ for }\\theta \\in \\left[ {{\\theta }_{1}},{{\\theta }_{2}} \\right]\\subset \\left( {{\\mu }^{-}};\\mu \\right)$for some non-negative μ−.","PeriodicalId":11287,"journal":{"name":"Discrete Mathematics and Applications","volume":null,"pages":null},"PeriodicalIF":0.3000,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Discrete Mathematics and Applications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1515/dma-2022-0026","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATHEMATICS, APPLIED","Score":null,"Total":0}
引用次数: 1
Abstract
Abstract We consider local probabilities of lower deviations for branching process Zn=Xn,1+⋯+Xn,Zn−1 ${{Z}_{n}}={{X}_{n,1}}+\cdots +{{X}_{n,{{Z}_{n-1}}}}$in random environment η. We assume that η is a sequence of independent identically distributed random variables and for fixed environment η the distributions of variables Xi,j are geometric ones.We suppose that the associated random walk Sn=ξ1+⋯+ξn ${{S}_{n}}={{\xi }_{1}}+\cdots +{{\xi }_{n}}$has positive mean μ and satisfies left-hand Cramer’s condition Eexp(hξi)<∞ if h−
期刊介绍:
The aim of this journal is to provide the latest information on the development of discrete mathematics in the former USSR to a world-wide readership. The journal will contain papers from the Russian-language journal Diskretnaya Matematika, the only journal of the Russian Academy of Sciences devoted to this field of mathematics. Discrete Mathematics and Applications will cover various subjects in the fields such as combinatorial analysis, graph theory, functional systems theory, cryptology, coding, probabilistic problems of discrete mathematics, algorithms and their complexity, combinatorial and computational problems of number theory and of algebra.