Berlin 2024 – scientific programme

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BP: Fachverband Biologische Physik

BP 30: Active Matter IV (joint session DY/BP/CPP)

BP 30.11: Talk

Thursday, March 21, 2024, 12:45–13:00, BH-N 334

Velocity-density scaling for active particles in an external field — •Colin-Marius Koch and Michael Wilczek — Theoretical Physics I, University of Bayreuth, Germany

Active particles in external fields can show diverse aggregation phenomena. The emerging collective phenomena and their statistics can thereby depend on microscopic details of active constituents’ interactions. Here, we investigate how different steric interactions and self-propulsion mechanisms affect the aggregation of active particles in an external field. While density and velocity profiles individually differ between the studied cases, they consistently scale inversely with each other, when the instantaneous velocity projected onto the particle orientation is considered. The observed velocity-density scaling is robust for relatively dilute systems in which no strong aggregation, i.e. motility-induced phase separation, is present. We conclude that different microscopic details can result in the same statistics of collective behaviour in systems that are dilute enough.

Keywords: active brownian particles; aggregation; external fields