Confined Collective Behavior of Aligning Self-Propelling Particles

We present a model for aligning self-propelling particles and look at the collective motion for such swimmers in non-trivial confined domains. To classify the behaviors of the swimmers in circular convex domains and racetracks, several order parameters have been considered. Based on those order parameters, we present the non-equilibrium phase diagrams of our model with respect to different geometries and sizes of confinement, the densities of swimmers, and the alignment distance. Lastly, we compare the results to experiments in active matter systems such as motile colloids, swimming bacteria or larva zebrafish, and note the qualitative similarities and differences.