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.
|Number of pages||4|
|Journal||Physical Review Letters|
|Early online date||13 Oct 2010|
|Publication status||Published - 15 Oct 2010|