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Phys Rev Lett. 2004 Jan 16;92(2):025702. Epub 2004 Jan 15.

Onset of collective and cohesive motion.

Author information

1
CEA-Service de Physique de l'Etat Condensé, CEN Saclay, 91191 Gif-sur-Yvette, France.

Abstract

We study the onset of collective motion, with and without cohesion, of groups of noisy self-propelled particles interacting locally. We find that this phase transition, in two space dimensions, is always discontinuous, including for the minimal model of Vicsek et al. [Phys. Rev. Lett. 75, 1226 (1995)]] for which a nontrivial critical point was previously advocated. We also show that cohesion is always lost near onset, as a result of the interplay of density, velocity, and shape fluctuations.

PMID:
14753946
DOI:
10.1103/PhysRevLett.92.025702
[Indexed for MEDLINE]

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