Durve Mihir, Saha Arnab, Sayeed Ahmed
Department of Physics, Università degli studi di Trieste, 34127, Trieste, Italy.
The Abdus Salam International Centre for Theoretical Physics, 34151, Trieste, Italy.
Eur Phys J E Soft Matter. 2018 Apr 9;41(4):49. doi: 10.1140/epje/i2018-11653-4.
We consider the flocking of self-propelling agents in two dimensions, each of which communicates with its neighbors within a limited vision-cone. Also, the communication occurs with some time-delay. The communication among the agents are modeled by Vicsek rules. In this study we explore the combined effect of non-reciprocal interaction (induced by limited vision-cone) among the agents and the presence of delay in the interactions on the dynamical pattern formation within the flock. We find that under these two influences, without any position-based attractive interactions or confining boundaries, the agents can spontaneously condense into "drops". Though the agents are in motion within the drop, the drop as a whole is pinned in space. We find that this novel state of the flock has a well-defined order and it is stabilized by the noise present in the system.
我们考虑二维空间中自推进个体的群聚行为，每个个体在有限的视锥范围内与邻居进行通信。此外，通信存在一定的时间延迟。个体之间的通信由Vicsek规则建模。在本研究中，我们探讨了个体间非互惠相互作用（由有限视锥引起）和相互作用中的延迟对群内动态模式形成的综合影响。我们发现，在这两种影响下，无需任何基于位置的吸引相互作用或限制边界，个体就能自发凝聚成“液滴”。尽管个体在液滴内运动，但液滴整体固定在空间中。我们发现，这种群聚的新状态具有明确的秩序，并且由系统中存在的噪声使其稳定。
