Tuning Nonequilibrium Phase Transitions with Inertia
arXiv:2108.10278 · doi:10.1063/5.0138256
Abstract
In striking contrast to equilibrium systems, inertia can profoundly alter the structure of active systems. Here, we demonstrate that driven systems can exhibit effective equilibrium-like states with increasing particle inertia, despite rigorously violating the fluctuation-dissipation theorem. Increasing inertia progressively eliminates motility-induced phase separation and restores equilibrium crystallization for active Brownian spheres. This effect appears to be general for a wide class of active systems, including those driven by deterministic time-dependent external fields, whose nonequilibrium patterns ultimately disappear with increasing inertia. The path to this effective equilibrium limit can be complex, with finite inertia sometimes acting to accentuate nonequilibrium transitions. The restoration of near equilibrium statistics can be understood through the conversion of active momentum sources to passive-like stresses. Unlike truly equilibrium systems, the effective temperature is now density dependent, the only remnant of the nonequilibrium dynamics. This density-dependent temperature can in principle introduce departures from equilibrium expectations, particularly in response to strong gradients. Our results provide additional insight into the effective temperature ansatz while revealing a mechanism to tune nonequilibrium phase transitions.
References in corpus (19)
- Motility-Induced Phase Separation
- Pressure and Phase Equilibria in Interacting Active Brownian Spheres
- A self-propelled particle in an external potential: is there an effective temperature?
- Effective Interactions in Active Brownian Suspensions
- Inertial effects of self-propelled particles: from active Brownian to active Langevin motion
- Towards a 'Thermodynamics' of Active Matter
- Time-(ir)reversibility in active matter: from micro to macro
- Inertial self-propelled particles
- Phase Diagram of Active Brownian Spheres: Crystallization and the Metastability of Motility-Induced Phase Separation
- Microscopic Origins of the Swim Pressure and the Anomalous Surface Tension of Active Matter
- Effective temperature and glassy dynamics of active matter
- Hyperuniform Active Chiral Fluids with Tunable Internal Structure
- Phase separation and multibody effects in three-dimensional active Brownian particles
- Applicability of Effective Pair Potentials for Active Brownian Particles
- Time-dependent inertia of self-propelled particles: the Langevin rocket
- Active Brownian particles at interfaces: An effective equilibrium approach
- Collective motion in large deviations of active particles
- Jerky active matter: a phase field crystal model with translational and orientational memory
- Hydrodynamic effects on the liquid-hexatic transition of active colloids
Cited by in corpus (11)
- Active phase separation: new phenomenology from non-equilibrium physics
- Dynamics of active particles with translational and rotational inertia
- From a microscopic inertial active matter model to the Schrödinger equation
- Transcription-induced active forces suppress chromatin motion
- Hydrodynamic effects on the liquid-hexatic transition of active colloids
- Exact moments and re-entrant transitions in the inertial dynamics of active Brownian particles
- How to define temperature in active systems?
- AMEP: The Active Matter Evaluation Package for Python
- Effect of speed fluctuations on the collective dynamics of active disks
- Theory for the Anomalous Phase Behavior of Inertial Active Brownian Particles
- Inertia-chirality interplay in active Brownian motion: exact dynamics and phase maps