Mathematics – Probability
Scientific paper
2007-09-18
Alea, v. 3, p. 273-299, 2007
Mathematics
Probability
38 pages, 2 figures; to appear in ALEA
Scientific paper
We study branching random walks in random environment on the $d$-dimensional square lattice, $d \geq 1$. In this model, the environment has finite range dependence, and the population size cannot decrease. We prove limit theorems (laws of large numbers) for the set of lattice sites which are visited up to a large time as well as for the local size of the population. The limiting shape of this set is compact and convex, though the local size is given by a concave growth exponent. Also, we obtain the law of large numbers for the logarithm of the total number of particles in the process.
Comets Francis
Popov Serguei
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