Attractive active particles in an activity gradient form droplets that move uphill, and at intermediate cohesion they run through sustained cycles of condensation, fragmentation, and reassembly.
Comment on "Flocking without Alignment Interactions in Attractive Active Brownian Particles [arXiv:2303.07746]"
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abstract
In a recent Letter, Caprini and L\"owen 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.
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Self-organization and cyclic positioning of active condensates
Attractive active particles in an activity gradient form droplets that move uphill, and at intermediate cohesion they run through sustained cycles of condensation, fragmentation, and reassembly.