“…Such a behavior is consistent with an exponential decay of the swimming-velocity autocorrelation function, as experimentally measured in several active colloidal suspensions [6,16,17]. Furthermore, the ABP model is also the basis for the theoretical investigation of intricate phenomena in active matter, such as self-propelled motion in presence of external potentials [18,19,20], external flows [21,22,23], under geometrical confinement [24,25,26], as well as collective phenomena of self-propelled particles, e.g. dynamical clustering and motility-induced phase separation [8,11,12,27,28,29].…”