From scalar to polar active matter: Connecting simulations with mean-field theory

Abstract

We study numerically the phase behavior of self-propelled elliptical particles interacting through the "hard" repulsive Gay-Berne potential at infinite Péclet number. Changing a single parameter, the aspect ratio, allows to continuously go from discoid active Brownian particles to elongated polar rods. Discoids show phase separation, which changes to a cluster state of polar domains, which then form polar bands as the aspect ratio is increased. From the simulations, we identify and extract the two effective parameters entering the mean-field description: the force imbalance coefficient and the effective coupling to the local polarization. These two coefficients are sufficient to obtain a complete and consistent picture, unifying the paradigms of scalar and polar active matter.

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Cited by in corpus (13)

• Active phase separation by turning toward regions of higher density
• A particle-field representation unifies paradigms in active matter
• Motility-Induced Clustering and Meso-Scale Turbulence in Active Polar Fluids
• Diversity of phase transitions and phase separations in active fluids
• Microscopic field theory for structure formation in systems of self-propelled particles with generic torques
• Phase behaviour and dynamics of three-dimensional active dumbbell systems
• Collective Hall current in chiral active fluids: Coupling of phase and mass transport through traveling bands
• Uncovering novel phase transitions in dense dry polar active fluids using a lattice Boltzmann method
• Turbulence-induced clustering in compressible active fluids
• Glass Transition in Monolayers of Rough Colloidal Ellipsoids
• Effect of anisotropy on the formation of active particle films
• A Data-Driven Statistical Description for the Hydrodynamics of Active Matter
• Phase separation of self-propelled disks with ferromagnetic and nematic alignment