Catanzaro, MicheleBoguñá, MariánPastor-Satorras, R. (Romualdo), 1967-2011-07-072011-07-0720051063-651Xhttps://hdl.handle.net/2445/18809We 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.9 p.application/pdfeng(c) American Physical Society, 2005Física matemàticaFísica mèdicaSistemes no linealsMathematical physicsMedical physicsNonlinear systemsinfo:eu-repo/semantics/article527053info:eu-repo/semantics/openAccess