Volume 141, Number 4, February 2023
|Number of page(s)||7|
|Section||Statistical physics and networks|
|Published online||03 February 2023|
Tuning attraction and repulsion between active particles through persistence
SUPA, School of Physics and Astronomy, University of Edinburgh - Edinburgh EH9 3FD, UK
(a) E-mail: firstname.lastname@example.org (corresponding author)
Received: 22 November 2022
Accepted: 25 January 2023
We consider the interplay between persistent motion, which is a generic property of active particles, and a recoil interaction which causes particles to jump apart on contact. The recoil interaction exemplifies an active contact interaction between particles, which is inelastic and is generated by the active nature of the constituents. It is inspired by the “shock” dynamics of certain microorganisms, such as Pyramimonas octopus, and always generates an effective repulsion between a pair of passive particles. Highly persistent particles can be attractive or repulsive, according to the shape of the recoil distribution. We show that the repulsive case admits an unexpected transition to attraction at intermediate persistence lengths, that originates in the advective effects of persistence. This allows active particles to fundamentally change the collective effect of active interactions amongst them, by varying their persistence length.
© 2023 The author(s)
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