title: Disordered environments in spatial games.
abstract: The Prisoner's dilemma is the main game theoretical framework in which the onset and maintainance of cooperation in biological populations is studied. In the spatial version of the model, we study the robustness of cooperation in heterogeneous ecosystems in spatial evolutionary games by considering site diluted lattices. The main result is that, due to disorder, the fraction of cooperators in the population is enhanced. Moreover, the system presents a dynamical transition at rho*, separating a region with spatial chaos from one with localized, stable groups of cooperators.
authors.affiliation: Instituto de Física Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501-970 Porto Alegre, RS, Brazil.
authors.forename: M H
authors.initials: MH
authors.lastname: Vainstein
authors.forename: J J
authors.initials: JJ
authors.lastname: Arenzon