Origins and diagnostics of the nonequilibrium character of active systems

Abstract

We present in detail a Langevin formalism for constructing stochastic dynamical equations for active-matter systems coupled to a thermal bath. We apply the formalism to clarify issues of principle regarding the sources and signatures of nonequilibrium behaviour in a variety of polar and apolar single-particle systems and polar flocks. We show that distance from thermal equilibrium depends on how time-reversal is implemented and hence on the reference equilibrium state. We predict characteristic forms for the frequency-resolved entropy production for an active polar particle in a harmonic potential, which should be testable in experiments.

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Cited by in corpus (44)

• Irreversibility and biased ensembles in active matter: Insights from stochastic thermodynamics
• Time-(ir)reversibility in active matter: from micro to macro
• The Entropy Production of Ornstein-Uhlenbeck Active Particles: a path integral method for correlations
• Nonmutual torques and the unimportance of motility for long-range order in two-dimensional flocks
• Asymmetric exchange in flocks
• Thermodynamics of active field theories: Energetic cost of coupling to reservoirs
• Oriented Active Solids
• Active cholesterics: odder than odd elasticity
• How irreversible are steady-state trajectories of a trapped active particle?
• Swimmer suspensions on substrates: anomalous stability and long-range order
• Chiral active hexatics: Giant number fluctuations, waves and destruction of order
• AOUP in the presence of Brownian noise: a perturbative approach
• Time-reversal symmetry violations and entropy production in field theories of polar active matter
• Stochastic Hydrodynamics of Complex Fluids: Discretisation and Entropy Production
• Deep learning probability flows and entropy production rates in active matter
• Approach to equilibrium and non-equilibrium stationary distributions of interacting many-particle systems that are coupled to different heat baths
• Thermodynamics of active matter: Tracking dissipation across scales
• Long-range phase order in two dimensions under shear flow
• Topologically-constrained fluctuations and thermodynamics regulate nonequilibrium response
• Inertia drives a flocking phase transition in viscous active fluids
• Signatures of irreversibility in microscopic models of flocking
• Thermodynamically consistent flocking: From discontinuous to continuous transitions
• Hohenberg-Mermin-Wagner type theorems for equilibrium models of flocking
• Thermodynamically consistent model of an active Ornstein-Uhlenbeck particle
• Dissipative timescales from coarse-graining irreversibility
• Enhanced orientational ordering induced by active yet isotropic bath
• Self-propulsion with speed and orientation fluctuation: exact computation of moments and dynamical bistabilities in displacement
• Inertia drives concentration-wave turbulence in swimmer suspensions
• Effects of the self-propulsion parity on the efficiency of a fuel-consuming active heat engine
• Quantifying dissipation in flocking dynamics: When tracking internal states matters
• Active uniaxially ordered suspensions on disordered substrates
• Chirality and odd mechanics in active columnar phases
• Incompressible polar active fluids with quenched disorder in dimensions $d>2$
• Entropy production rate in thermodynamically consistent flocks
• Front speed and pattern selection of a propagating chemical front in an active fluid
• Heat Dissipation Rate in a Nonequilibrium Viscoelastic Medium
• Entropy production in non-reciprocal polar active mixtures
• Unified description of viscous, viscoelastic, or elastic thin active films on substrates
• Rheologically tuned modes of collective transport in active viscoelastic films
• Phase separation of chemokinetic active particles
• Optimizing Energetic cost of Uncertainty in a Driven System With and Without Feedback
• Edge states, pairing, and sorting of motile chiral particles
• Superdiffusion and antidiffusion in an aligned active suspension
• Instabilities and turbulence in extensile swimmer suspensions