Nonequilibrium clustering of self-propelled rods
Résumé
Motivated by aggregation phenomena in gliding bacteria, we study collective motion in a two-dimensional model of active, self-propelled rods interacting through volume exclusion. In simulations with individual particles, we find that particle clustering is facilitated by a sufficiently large packing fraction η or length-to-width ratio κ. The transition to clustering in simulations is well captured by a mean-field model for the cluster size distribution, which predicts that the transition values κc of the aspect ratio for a fixed packing fraction η are given by κc=C∕η−1 where C is a constant.
Domaines
Biophysique [physics.bio-ph]
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