Abstract:
For a critical branching process $(Z_n)$ in a random environment $(\xi _n)$, a sufficient condition is given for the corresponding martingale ${Z_n}/{e^{S_n}}$ to converge in $L^1$ or to degenerate under $\mathbb P^+$, the probability under which the associated random walk is conditioned to stay nonnegative.
Keywords:branching process, random environment, multitype branching processes, change of measure, martingale convergence.
Funding agency
Grant number
National Key Research and Development Program of China
Scientific Research Foundation for Young Teachers in the Capital University of Economics and Business
XRZ2021035
This work was supported in part by the National Key Research and Development Program of China (no. 2020YFA0712900), NSFC (nos. 11971062, 12101419), and the Scientific Research Foundation for Young Teachers in the Capital University of Economics and Business (no. XRZ2021035).
Citation:
Wenming Hong, Shengli Liang, Xiaoyue Zhang, “Conditional $L^1$-Convergence for the Martingale of a Critical Branching Process in Random Environment”, Branching Processes and Related Topics, Collected papers. On the occasion of the 75th birthday of Andrei Mikhailovich Zubkov and 70th birthday of Vladimir Alekseevich Vatutin, Trudy Mat. Inst. Steklova, 316, Steklov Math. Inst., Moscow, 2022, 195–206; Proc. Steklov Inst. Math., 316 (2022), 184–194
\Bibitem{HonLiaZha22}
\by Wenming~Hong, Shengli~Liang, Xiaoyue~Zhang
\paper Conditional $L^1$-Convergence for the Martingale of a Critical Branching Process in Random Environment
\inbook Branching Processes and Related Topics
\bookinfo Collected papers. On the occasion of the 75th birthday of Andrei Mikhailovich Zubkov and 70th birthday of Vladimir Alekseevich Vatutin
\serial Trudy Mat. Inst. Steklova
\yr 2022
\vol 316
\pages 195--206
\publ Steklov Math. Inst.
\publaddr Moscow
\mathnet{http://mi.mathnet.ru/tm4245}
\crossref{https://doi.org/10.4213/tm4245}
\transl
\jour Proc. Steklov Inst. Math.
\yr 2022
\vol 316
\pages 184--194
\crossref{https://doi.org/10.1134/S0081543822010138}
\scopus{https://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85129336378}