The Survival of One-Dimensional Contact Processes in Random Environments
Liggett, Thomas M.
Ann. Probab., Tome 20 (1992) no. 4, p. 696-723 / Harvested from Project Euclid
Consider the inhomogeneous contact process on $Z^1$ with recovery rate $\delta(k)$ at site $k$ and infection rates $\lambda(k)$ and $\rho(k)$ at site $k$ due to the presence of infected neighbors at $k - 1$ and $k + 1$ respectively. A special case of the main result in this paper is the following: Suppose that the environment is chosen in such a way that the $\delta(k)$'s, $\lambda(k)$'s and $\rho(k)$'s are all mutually independent, with the $\delta(k)$'s having a common distribution, and the $\lambda(k)$'s and $\rho(k)$'s having a common distribution. Then the process survives if $E\frac{\delta(\lambda + \rho + \delta)}{\lambda\rho} < 1,$ while the right edge $r_t$ of the process with initial configuration $\cdots$ 111000 $\cdots$ satisfies $\lim\sup_{t\rightarrow\infty}r_t = +\infty$ if $E\log\frac{\delta(\lambda + \rho + \delta)}{\lambda\rho} < 0.$ If the environment is deterministic and periodic with period $p$, we prove survival if $\Pi^p_{k=1}\frac{\delta(k)\lbrack\lambda(k) + \rho(k - 1) + \delta(k)\rbrack}{\lambda(k)\rho(k - 1)} < 1$ and $\Pi^p_{k=1}\frac{\delta(k - 1)\lbrack\lambda(k) + \rho(k - 1) + \delta(k - 1)\rbrack}{\lambda(k)\rho(k - 1)} < 1.$
Publié le : 1992-04-14
Classification:  Contact process,  processes in random environments,  60K35
@article{1176989801,
     author = {Liggett, Thomas M.},
     title = {The Survival of One-Dimensional Contact Processes in Random Environments},
     journal = {Ann. Probab.},
     volume = {20},
     number = {4},
     year = {1992},
     pages = { 696-723},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1176989801}
}
Liggett, Thomas M. The Survival of One-Dimensional Contact Processes in Random Environments. Ann. Probab., Tome 20 (1992) no. 4, pp.  696-723. http://gdmltest.u-ga.fr/item/1176989801/