Figure 5.
Numerical simulations. (a) We consider two-dimensional simulations of hard disks propelled at a constant velocity V 0 (red arrows) with a fluctuating direction of propulsion and an attraction interaction V (r) (black arrow). The noise on the direction is a Gaussian noise, which amplitude is set by thermal rotational diffusion. (b) Event-driven algorithm for the collisions. If two particles overlap after a displacement, they are separated by moving each one of them half of the overlap distance along their centre-to-centre axis. This algorithm does not introduce correlations in the propulsion direction nor collisions and motion. (Online version in colour.)