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Title: Diffusion-annihilation processes in complex networks
Author: Catanzaro, Michele
Boguñá, Marián
Pastor-Satorras, R. (Romualdo), 1967-
Keywords: Física matemàtica
Física mèdica
Sistemes no lineals
Mathematical physics
Medical physics
Nonlinear systems
Issue Date: 2005
Publisher: The American Physical Society
Abstract: We present a detailed analytical study of the $A+A\to\emptyset$ diffusion-annihilation process in complex networks. By means of microscopic arguments, we derive a set of rate equations for the density of $A$ particles in vertices of a given degree, valid for any generic degree distribution, and which we solve for uncorrelated networks. For homogeneous networks (with bounded fluctuations), we recover the standard mean-field solution, i.e. a particle density decreasing as the inverse of time. For heterogeneous (scale-free networks) in the infinite network size limit, we obtain instead a density decreasing as a power-law, with an exponent depending on the degree distribution. We also analyze the role of finite size effects, showing that any finite scale-free network leads to the mean-field behavior, with a prefactor depending on the network size. We check our analytical predictions with extensive numerical simulations on homogeneous networks with Poisson degree distribution and scale-free networks with different degree exponents.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2005, vol. 71, núm. , p. 056104-1-056104-9
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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