Active and passive particles: modeling beads in a bacterial bath.
A simple model for the motion of passive particles in a bath of active, self-propelled ones is introduced. It is argued that this approach provides the correct framework within which to cast the recent experimental results obtained by Wu and Libchaber [Phys Rev. Lett. 84, 3017 (2000)] for the diffusive properties of polystyrene beads displaced by bacteria suspended in a two-dimensional fluid film. Our results suggest that superdiffusive behavior should indeed be generically observed in the transition region marking the onset of collective motion.
Grégoire
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CEA, Service de Physique de l'Etat Condensé, Centre d'Etudes de Saclay, 91191, Gif-sur-Yvette, France.
Chaté
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D018407:Bacterial Physiological Phenomena; D055592:Biophysical Phenomena; D001703:Biophysics; D004058:Diffusion; D008954:Models, Biological; D015233:Models, Statistical; D011137:Polystyrenes / Q000737:chemistry*; D013997:Time Factors
D011137:Polystyrenes