Mathematics – Probability
Scientific paper
2005-03-19
Annals of Probability 2006, Vol. 34, No. 6, 2382-2405
Mathematics
Probability
Published at http://dx.doi.org/10.1214/009117906000000511 in the Annals of Probability (http://www.imstat.org/aop/) by the Ins
Scientific paper
10.1214/009117906000000511
We consider two species of particles performing random walks in a domain in $\mathbb{R}^d$ with reflecting boundary conditions, which annihilate on contact. In addition, there is a conservation law so that the total number of particles of each type is preserved: When the two particles of different species annihilate each other, particles of each species, chosen at random, give birth. We assume initially equal numbers of each species and show that the system has a diffusive scaling limit in which the densities of the two species are well approximated by the positive and negative parts of the solution of the heat equation normalized to have constant $L^1$ norm. In particular, the higher Neumann eigenfunctions appear as asymptotically stable states at the diffusive time scale.
Burdzy Krzysztof
Quastel Jeremy
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