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arXiv 0910.0955cond-mat.stat-mechphysics.soc-ph
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具有随机变量的格子上囚徒困境的动态相变

Dynamic Phase Transition in Prisoner's Dilemma on a Lattice with Stochastic Modifications

M. Ali Saif, Prashant M. Gade

摘要:

我们提出了一个详细的研究囚犯的困境游戏的随机修改的二维格,在存在的进化动力学。由于规则的本质,在囚徒困境中,合作者有欺骗的动机和被欺骗的恐惧,甚至在不受进化动力学支配的情况下也可能欺骗。我们考虑两个变量。在任何一种情况下,代理都模仿邻居中最成功的代理在前一个时间步中的动作(合作或背叛)。除此之外,在第一个变体中,合作者的分数p在每个时间步自发地将其策略改变为纯叛逃者。在第二种变体中,没有纯粹的合作者。所有合作者在每个时间步都以概率p背叛。在这两种情况下,系统切换从共存状态到一个所有的defector状态为更高的值的p。我们表明,这些状态之间的过渡明确属于定向渗透普适类在2 + 1维。我们还研究了局部持续性,持续性指数高于以往的研究,强调了它们对动力学细节的依赖

英文摘要:

We present a detailed study of prisoner's dilemma game with stochastic modifications on a two-dimensional lattice, in presence of evolutionary dynamics. By very nature of the rules, the cooperators have incentive to cheat and the fear to being cheated in prisoner's dilemma and may cheat even when not dictated by evolutionary dynamics. We consider two variants. In either case, the agents mimic the action (cooperation or defection) in the previous timestep of the most successful agent in the neighborhood. Over and above this, the fraction p of cooperators spontaneously change their strategy to pure defector at every time step in the first variant. In the second variant, there are no pure cooperators. All cooperators keep defecting with probability p at every time-step. In both cases, the system switches from coexistence state to an all-defector state for higher values of p. We show that the transition between these states unambiguously belongs to directed percolation universality class in 2 + 1 dimension. We also study the local persistence and the persistence exponents are higher than ones obtained in previous studies underlining their dependence on details of dynamics

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