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    Université de Fribourg

    Optimal view angle in collective dynamics of self-propelled agents

    Tian, Bao-Mei ; Yang, Han-Xin ; Li, Wei ; Wang, Wen-Xu ; Wang, Bing-Hong ; Zhou, Tao

    In: Physical Review E, 2009, vol. 79, no. 5, p. 052102

    We study a system of self-propelled agents with the restricted vision. The field of vision of each agent is only a sector of disk bounded by two radii and the included arc. The inclination of these two radii is characterized by the view angle. The consideration of restricted vision is closer to the reality because natural swarms usually do not have a panoramic view. Interestingly, we find that...

    Université de Fribourg

    Randomness enhances cooperation: A resonance-type phenomenon in evolutionary games

    Ren, Jie ; Wang, Wen-Xu ; Qi, Feng

    In: Physical Review E, 2007, vol. 75, p. 045101

    We investigate the effect of randomness in both relationships and decisions on the evolution of cooperation. Simulation results show, in such randomness' presence, the system evolves more frequently to a cooperative state than in its absence. Specifically, there is an optimal amount of randomness, which can induce the highest level of cooperation. The mechanism of randomness promoting cooperation...