Reputation-based partner choice among mobile players

We study the effects of mobility on the evolution of cooperation among mobile players, which play prisoner's dilemma games with neighbors within a prescribed radius. We define the reputation as the times one cooperates in past times. We show that reputation-based partner choice promotes cooperation, when compared with the case that partners are chosen at random. And for large values of the velocity, the radius and the temptation to defect, reputation-based partner choice makes cooperators survive. When adopting the latest strategy record as the reputation, we find that the cooperation level among mobile players can be promoted most effectively.