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Effects of mobility on ordering dynamics
Baronchelli, Andrea; Pastor Satorras, Romualdo
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
Models of ordering dynamics allow us to understand natural systems in which an initially disordered population homogenizes some traits via local interactions. The simplest of these models, with wide applications ranging from evolutionary to social dynamics, are the Voter and Moran processes, usually defined in terms of static or randomly mixed individuals that interact with a neighbor to copy or modify a discrete trait. Here we study the effects of diffusion in Voter/Moran processes by proposing a generalization of ordering dynamics in a metapopulation framework, in which individuals are endowed with mobility and diffuse through a spatial structure represented as a graph of patches upon whichinteractions take place. We show that diffusion dramatically affects the time toreach the homogeneous state, independently of the underlying network’s topology, while the final consensus emerges through different local/global mechanisms, depending on the mobility strength. Our results highlight the crucial role played by mobility in ordering processes and set up a general framework that allows its effect to be studied on a large class of models, with implications in the understanding of evolutionary and social phenomena.
2012-05-10
Àrees temàtiques de la UPC::Física
Statistical physics
Física estadística
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