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Via molecular dynamics simulations we have studied kinetics of vapor-"solid"phase transition in an active matter model in which self-propulsion isintroduced via the well-known Vicsek rule. The overall density of the particlesis chosen in such a way that the evolution morphology consists of disconnectedclusters that are defined as regions of high density of particles. Our focushas been on understanding the influence of the above mentioned self-propulsionon structure and growth of these clusters by comparing the results with thosefor the passive limit of the model that also exhibits vapor-"solid" transition.While in the passive case the growth occurs due to standard diffusivemechanism, the Vicsek activity leads to a very rapid growth, via a process thatis practically equivalent to the ballistic aggregation mechanism. The emerginggrowth law in the latter case has been accurately estimated and explained byinvoking information on velocity and structural aspects of the clusters into arelevant theory. Some of these results are also discussed with reference to amodel for the active Brownian particles.

How Do Clusters in Phase-Separating Active Matter Systems Grow? A study for Vicsek activity in systems undergoing vapor-solid transition