Ginelli F.,CEA Saclay Nuclear Research Center |
Ginelli F.,Institute Des Systemes Complexes Of Paris Ile Of France |
Chate H.,CEA Saclay Nuclear Research Center
Physical Review Letters | Year: 2010
We show that the collective properties of self-propelled particles aligning with their topological (Voronoi) neighbors are qualitatively different from those of usual models where metric interaction ranges are used. This relevance of metric-free interactions, shown in a minimal setting, indicate that realistic models for the cohesive motion of cells, bird flocks, and fish schools may have to incorporate them, as suggested by recent observations. © 2010 The American Physical Society.