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Phase diagrams for three-strategy evolutionary prisoner's dilemma games on regular graphs TeX Export

ArXiv e-prints (October 2009)

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game theory

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Evolutionary prisoner's dilemma games are studied with players located on square lattice and random regular graphs defining four neighbors for each one. The players follow one of the three strategies: tit-for-tat, unconditional cooperation, and defection. The simplified payoff matrix is characterized by two parameters: the temptation $b$ to choose defection, and the cost $c$ of inspection reducing the income of tit-for-tat. The strategy imitation from one of the neighbors is controlled by pairwise comparison at a fixed level of noise. Using Monte Carlo simulations and the extended versions of pair approximation we have evaluated the $b-c$ phase diagrams indicating a rich plethora of phase transitions between stationary coexistence, absorbing and oscillatory states, including continuous and discontinuous phase transitions. By reasonable costs the tit-for-tat strategy prevents extinction of cooperators across the whole span of $b$ values determining the prisoner's dilemma game, irrespective of the interaction graph structure. We also demonstrate that the system can exhibit a repetitive succession of oscillatory and stationary states upon changing a single payoff value, which highlights the remarkable sensitivity of cyclical interactions on parameters that define the strength of dominance.


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