Nonequilibrium transition induced by mass media in a model for social influence

4 pages, 4 figures.-- PACS nrs.: 89.75.Fb, 87.23.Ge, 05.50.+q.-- ArXiv pre-print available: http://arxiv.org/abs/nlin/0511013We study the effect of mass media, modeled as an applied external field, on a social system based on Axelrod's model for the dissemination of culture. The numerical simulations show that the system undergoes a nonequilibrium phase transition between an ordered phase (homogeneous culture) specified by the mass media and a disordered (culturally fragmented) one. The critical boundary separating these phases is calculated on the parameter space of the system, given by the intensity of the mass media influence and the number of options per cultural attribute. Counterintuitively, mass media can induce cultural diversity when its intensity is above some threshold value. The nature of the phase transition changes from continuous to discontinuous at some critical value of the number of options. A linear relation characterizing the change in the order of the phase transition is found.This work was partially supported by Grant No. C-1285-04-05-A from Consejo de Desarrollo Científico, Humanístico y Tecnológico of Universidad de Los Andes, Venezuela.Peer reviewe