Survival of Branching Random Walks in Random Environment
Survival of Branching Random Walks in Random Environment
复制标题
随机环境中分支随机游走的生存
DOI:
--
复制
发表时间:
2008
期刊:
影响因子:
--
通讯作者:
M. Vachkovskaia
中科院分区:
文献类型:
--
作者:
N. Gantert;S. Müller;S. Popov;M. Vachkovskaia
We study survival of nearest-neighbor branching random walks in random environment (BRWRE) on ℤ. A priori there are three different regimes of survival: global survival, local survival, and strong local survival. We show that local and strong local survival regimes coincide for BRWRE and that they can be characterized with the spectral radius of the first moment matrix of the process. These results are generalizations of the classification of BRWRE in recurrent and transient regimes. Our main result is a characterization of global survival that is given in terms of Lyapunov exponents of an infinite product of i.i.d. 2×2 random matrices.