Berlin 2008 – scientific programme

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AKSOE: Arbeitskreis Physik sozio-ökonomischer Systeme

AKSOE 8: Economic Models and Evolutionary Game Theory

AKSOE 8.3: Talk

Tuesday, February 26, 2008, 11:15–11:45, EW 203

Impact of Topology on the Dynamical Organization of Cooperation — Andreas Pusch, •Sebastian Weber, and Markus Porto — Institut für Festkörrperphysik, Technische Universität Darmstadt, Germany

The way cooperation organizes dynamically strongly depends on the topology of the underlying interaction network. We study this dependence using heterogeneous scale-free networks with different levels of (a) degree-degree correlations and (b) enhanced clustering [1], where the number of neighbors of connected nodes are correlated and the number of closed triangles are enhanced, respectively. Using these networks, we analyze the evolutionary replicator dynamics of the prisoner’s dilemma, a two-player game with two strategies, defection and cooperation, whose payoff matrix favors defection. Both topological features significantly change the dynamics with respect to the one observed for fully randomized scale-free networks and can strongly facilitate cooperation even for a large benefit in defection and should hence be considered as important factors in the evolution of cooperation.

[1] A. Pusch, S. Weber, and M. Porto, submitted