Comment on "Flocking without Alignment Interactions in Attractive Active Brownian Particles [arXiv:2303.07746]"

Abstract

In a recent Letter, Caprini and Löwen argue that attractive active Brownian particles can flock even in the absence of explicit aligning interactions of their velocities. In this comment, I show that the phenomenology described in [Phys. Rev. Lett. {\bf 130}, 148202 (2023)] in fact lacks several defining features of flocking, such as long-range correlations and large-scale directed motion.