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Diffusion-annihilation processes in complex networks
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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.
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CATANZARO, Michele, BOGUÑÁ, Marián and PASTOR-SATORRAS, R. (Romualdo). Diffusion-annihilation processes in complex networks. Physical Review E. 2005. Vol. 71, pags. 056104-1-056104-9. ISSN 1063-651X. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/18809