Localization for Linear Stochastic Evolutions

Details Localization for Linear Stochastic Evolutions Localization for Linear Stochastic Evolutions

2008-10-23

arxiv.org/abs/0810.4218v3

Mathematics

Probability

Scientific paper

We consider a discrete-time stochastic growth model on the $d$-dimensional lattice with non-negative real numbers as possible values per site. The growth model describes various interesting examples such as oriented site/bond percolation, directed polymers in random environment, time discretizations of the binary contact path process. We show the equivalence between the slow population growth and a localization property in terms of "replica overlap". The main novelty of this paper is that we obtain this equivalence even for models with positive probability of extinction at finite time. In the course of the proof, we characterize, in a general setting, the event on which an exponential martingale vanishes in the limit.

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