Abstract
We consider a system of particles which perform continuous time random walks onZ d. These random walks are independent as long as no two particles are at the same site or adjacent to each other. When a particle jumps from a site x to a sitey and there is already another particle aty or at some neighbory′ ofy, then there is an interaction. In the coalescing model, either the particle which just jumped toy is removed (or, equivalently, coalesces with a particle aty ory′) or all the particles at the sites adjacent toy (other thanx) are removed. In the annihilating random walk, the particle which just jumped toy and one particle aty ory′ annihilate each other. We prove that when the dimensiond is at least 9, then the density of this system is asymptotically equivalent toC/t for some constant C, whose value is explicitly given.
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Kesten, H. Coalescing and annihilating random walk with ‘action at a distance’. J. Anal. Math. 80, 183–256 (2000). https://doi.org/10.1007/BF02791537
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DOI: https://doi.org/10.1007/BF02791537