| Cooperative behavior is widespread in real complex systems,such as microorganisms,honeybees,and cancer cells.The cooperative behavior in human society is more diverse and its promotion mechanism is more complex.Cooperation creates better group advantages for the population but reduces the competitiveness of individuals.In the prisoner’s dilemma game,collective irrational defection will become the dominant strategy of rational individuals.Evolutionary games in complex networks are an effective theoretical framework for studying the cooperative evolution of structured groups and characterize the structure and interaction of groups.This paper studies the evolution of cooperation in the network and analyzes the competition of strategies and the evolution of the network.The main work includes the following two contents:(1)The public goods game with the introduction of trust evaluation mechanism is studied.In a dynamic network,the game relationship between players is unstable.Considering that it is difficult for player to grasp the past cooperation frequency of new neighbors,this paper proposes a trust evaluation model based on edge benefits.The evaluation of neighbors starts from the first-round game in which the two players together,and the trust score is only controlled by the evaluation party.In each round of the game,the players will dynamically adjust the topology structure according to the trust score and make full use of the trust score information.The results show that the trust evaluation model in the dynamic network effectively promotes cooperation.(2)Public goods games that introduce alliance strategy are studied.In spatial games,in addition to the traditional cooperation and defection,there is also alliance.In the same game group,alliance players will give some payoff to subsidize other Alliance players they engage with the defectors.The results show that alliance players do an excellent job of suppress defectors through spatial reciprocity.However,affected by the cooperator,the cooperation ratio is a non-monotonic function of strength of help and cooperativity factor.The results contribute to understanding the role of alliance,union,and taxation in cooperation. |
