Examples of non-equilibrium cluster formation in self-propelled particle systems.

<p>Examples of non-equilibrium cluster formation in self-propelled particle systems. (a) Large moving clusters in experiments with myxobacteria, where it has been found that the cluster size distribution (CSD) is a function of the cell density as shown in (b). (c) Snapshot of moving clusters in self-propelled rod simulations, where the CSD is known to be a function of the particle density, as illustrated in (d).