Cooperation in the Prisoner's Dilemma Game in Random Scale-Free Graphs

JULIA PONCELA∗, JESÚS GÓMEZ-GARDEÑES∗,†,‡,‖, YAMIR MORENO∗,§ and LUIS MARIO FLORÍA∗,¶ ∗Institute for Biocomputation and Physics of Complex Systems (BIFI ), University of Zaragoza, Zaragoza E-50009, Spain †Departament d’Enginyeria Informática i Matemátiques, University Rovira i Virgili, Tarragona E-43007, Spain ‡Scuola Superiore di Catania, University of Catania, Catania I-95123, Italy §Department of Theoretical Physics, University of Zaragoza, Zaragoza E-50009, Spain ¶Department of Condensed Matter Physics, University of Zaragoza, Zaragoza E-50009, Spain ‖[email protected]