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.

References in corpus (12)

• Motility-Induced Phase Separation
• Meso-scale turbulence in living fluids
• Collective motion of self-propelled particles interacting without cohesion
• Non-equilibrium clustering of self-propelled rods
• Swarming and swirling in self-propelled polar granular rods
• Pattern formation in self-propelled particles with density-dependent motility
• Enhanced diffusion and ordering of self-propelled rods
• From Phase to Micro-Phase Separation in Flocking Models: The Essential Role of Non-Equilibrium Fluctuations
• Swarm behavior of self-propelled rods and swimming flagella
• Dynamical mean-field theory and weakly non-linear analysis for the phase separation of active Brownian particles
• Interparticle torques suppress motility-induced phase separation for rodlike particles
• Three-body correlations and conditional forces in suspensions of active hard disks

Cited by in corpus (9)

• Motility-Induced Clustering and Meso-Scale Turbulence in Active Polar 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
• 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
• Phase separation of self-propelled disks with ferromagnetic and nematic alignment
• A Data-Driven Statistical Description for the Hydrodynamics of Active Matter