arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1307.4375q-bio.PEcond-mat.stat-mechnlin.AOphysics.soc-ph
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有促进者的进化博弈:选择何时有利于合作?

Evolutionary games with facilitators: When does selection favor cooperation?

Mauro Mobilia

摘要:

我们研究了选择和随机波动对两种策略(“合作”和“背叛”)博弈的演化动力学的综合影响,其中种群中包含合作促进者。后者是通过增强合作者相对于背叛者的适应性的生殖潜力来支持合作的个体。通过计算固定概率的一个单一的合作者在有限的和混合的人口,包括一个固定数量的促进者,并通过使用平均场分析,我们确定当选择促进合作的重要类的囚徒困境,雪堆和猎鹿游戏。特别是,我们确定的情况下,选择有利于取代和入侵的合作背叛。我们的研究结果,证实了随机模拟,表明可以通过各种情况下促进合作的传播时,密度的促进者超过一个临界值,其依赖于人口规模和选择强度进行了分析。我们还确定在哪些条件下合作更有可能取代背叛,而不是相反。关键词:进化博弈;合作动力学;社会困境;固定;种群动力学。

英文摘要:

We study the combined influence of selection and random fluctuations on the evolutionary dynamics of two-strategy ("cooperation" and "defection") games in populations comprising cooperation facilitators. The latter are individuals that support cooperation by enhancing the reproductive potential of cooperators relative to the fitness of defectors. By computing the fixation probability of a single cooperator in finite and well-mixed populations that include a fixed number of facilitators, and by using mean field analysis, we determine when selection promotes cooperation in the important classes of prisoner's dilemma, snowdrift and stag-hunt games. In particular, we identify the circumstances under which selection favors the replacement and invasion of defection by cooperation. Our findings, corroborated by stochastic simulations, show that the spread of cooperation can be promoted through various scenarios when the density of facilitators exceeds a critical value whose dependence on the population size and selection strength is analyzed. We also determine under which conditions cooperation is more likely to replace defection than vice versa. Keywords: Evolutionary games; dynamics of cooperation; social dilemmas; fixation; population dynamics.

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