부산대학교 도서관

Migration has received lots of attentions as a mechanism for facilitating the evolution of cooperation in network games. However, whether the role of migration in the evolution of cooperation is fully understood is still a debatable topic. Most previous work has generally assumed that individuals always disconnect from their preceding neighbors once they migrate, which is not always consistent with the reality. For this reason, here we examine a random migration mechanism with neighbor retention where individuals can retain relationship with some of their previous neighbors after migration. The results show that retaining a certain number of previous neighbors during migration can facilitate cooperation even if individuals migrate in a completely random way. Significantly, it can also help cooperator in random migration restore the ability to resist the invasion of defector. A positive correlation is established between the number of retained neighbors and the facilitation effect on cooperation. Our results may help explain the role of migration in underpinning the evolution of cooperation.