Transient Pattern Formation in an Active Matter Contact Poisoning Model
arXiv:2304.13686 · doi:10.1038/s42005-023-01387-7
Abstract
One of the most notable features in repulsive particle based active matter systems is motility-induced-phase separation (MIPS) where a dense, often crystalline phase coexists with a low density fluid. In most active matter studies, the activity is kept constant as a function of time; however, there are many examples of active systems in which individual particles transition from living or moving to dead or nonmotile due to lack of fuel, infection, or poisoning. Here we consider an active matter particle system at densities where MIPS does not occur. When we add a small number of infected particles that can effectively poison other particles, rendering them nonmotile, we find a rich variety of time dependent pattern formation, including MIPS, a wetting phase, and a fragmented state formed when mobile particles plow through an nonmotile packing. We map out the patterns as a function of time scaled by the duration of the epidemic, and show that the pattern formation is robust for a wide range of poisoning rates and activity levels. We also show that pattern formation does not occur in a random death model, but requires the promotion of nucleation by contact poisoning. Our results should be relevant to biological and active matter systems where there is some form of poisoning, death, or transition to nonmotility.
arXiv comment7 pages, 6 figures
References in corpus (30)
- Traffic and Related Self-Driven Many-Particle Systems
- Active Particles in Complex and Crowded Environments
- Motility-Induced Phase Separation
- Dynamical clustering and phase separation in suspensions of self-propelled colloidal particles
- Athermal Phase Separation of Self-Propelled Particles with no Alignment
- Pressure is not a state function for generic active fluids
- Bacterial hopping and trapping in porous media
- Activity-induced phase separation and self-assembly in mixtures of active and passive particles
- Sedimentation, trapping, and rectification of dilute bacteria
- Distortion and destruction of colloidal flocks in disordered environments
- Tunable long range forces mediated by self-propelled colloidal hard spheres
- Active Matter Transport and Jamming on Disordered Landscapes
- Time-(ir)reversibility in active matter: from micro to macro
- Casimir Effect in Active Matter Systems
- Dynamic Phases of Active Matter Systems with Quenched Disorder
- Crystallizing hard-sphere glasses by doping with active particles
- Morphological computation and decentralized learning in a swarm of sterically interacting robots
- Activity-controlled Annealing of Colloidal Monolayers
- Dynamics and Steady States in excitable mobile agent systems
- Collective forces in scalar active matter
- Wetting Transitions Displayed by Persistent Active Particles
- Dynamic clustering of passive colloids in dense suspensions of motile bacteria
- Swimming to Stability: Structural and Dynamical Control via Active Doping
- Activity-controlled clogging and unclogging of micro-channels
- Information and motility exchange in collectives of active particles
- Fractal aggregation of active particles
- Steady states of active Brownian particles interacting with boundaries
- Epidemic processes on self-propelled particles: continuum and agent-based modelling
- Fluctuations and the role of collision duration in reaction-diffusion systems
- Transition from Susceptible-Infected to Susceptible-Infected-Recovered Dynamics in a Susceptible-Cleric-Zombie-Recovered Active Matter Model