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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.

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