Probing the limits of effective temperature consistency in actively driven systems
arXiv:2508.07362 · doi:10.1039/D5SM00840A
Abstract
We investigate the thermodynamic properties of a single inertial probe driven into a nonequilibrium steady-state by random collisions with self-propelled active walkers. The probe and walkers are confined within a gravitational harmonic potential. We evaluate the robustness of the effective temperature concept in this active system by comparing values of distinct, independently motivated definitions: a generalized fluctuation-dissipation relation, a kinetic temperature, and a work fluctuation relation. Our experiments reveal that, under specific conditions, these independent measurements yield a remarkably consistent effective temperature over a wide range of system configurations. Furthermore, we also identify regimes where this consistency breaks down, which delineates the fundamental limits of extending equilibrium-like thermodynamic concepts to athermal, actively driven systems.
References in corpus (56)
- Fluctuation-Dissipation: Response Theory in Statistical Physics
- How far from equilibrium is active matter?
- Sedimentation of active colloidal suspensions
- Fluctuations and response of nonequilibrium states
- A Dynamical Approach to Temperature
- Nonequilibrium glass transitions in driven and active matter
- The effective temperature
- Effective Temperatures of a Driven System Near Jamming
- Dynamics of a self-propelled particle in a harmonic trap
- Generalized energy equipartition in harmonic oscillators driven by active baths
- Shearing a Glassy Material: Numerical Tests of Nonequilibrium Mode-Coupling Approaches and Experimental Proposals
- Temperature in and out of equilibrium: a review of concepts, tools and attempts
- A fluidized granular medium as an instance of the Fluctuation Theorem
- A kinetic approach to granular gases
- Velocity distributions in dissipative granular gases
- The Effective Temperature Concept Tested in an Active Colloid Mixture
- Steady state fluctuation relations for systems driven by an external random force
- Fluctuation-Dissipation theorems and entropy production in relaxational systems
- Fluctuation-Dissipation relations in Driven Granular Gases
- From single-particle to collective effective temperatures in an active fluid of self-propelled particles
- Minimal Model of Stochastic Athermal Systems: Origin of Non-Gaussian Noise
- Fluctuations of internal energy flow in a vibrated granular gas
- Reexamination of experimental tests of the fluctuation theorem
- Response theory: a trajectory-based approach
- The fluctuation-dissipation relation: how does one compare correlation functions and responses?
- Fluctuating motion in an active environment
- Experimental evidence of non-Gaussian fluctuations near a critical point
- Work and dissipation fluctuations near the stochastic resonance of a colloidal particle
- Effective temperatures and activated dynamics for a two-dimensional air-driven granular system on two approaches to jamming
- Effective temperatures in inhomogeneous passive and active bidimensional Brownian particle systems
- Role of rotational inertia for collective phenomena in active matter
- Linear Response Theory for Hard and Soft Glassy Materials
- Underdamped Active Brownian Heat Engine
- Nonequilibrium Brownian motion beyond the effective temperature
- Active matter: quantifying the departure from equilibrium
- Fluctuation-Dissipation relation in sub-diffusive systems: the case of granular single-file
- On the Einstein relation between mobility and diffusion coefficient in an active bath
- Rapid-Prototyping a Brownian Particle in an Active Bath
- Configurational temperature of charge-stabilized colloidal monolayers
- Note on nonequilibrium stationary states and entropy
- Aging and effective temperatures near a critical point
- Dependence of the fluctuation-dissipation temperature on the choice of observable
- Frequency-dependent fluctuation-dissipation relations in granular gases
- Passive particle in an active bath: How can we tell it is out of equilibrium?
- How to define temperature in active systems?
- Brownian particle in a Poisson-shot-noise active bath: exact statistics, effective temperature, and inference
- Energetics of a driven Brownian harmonic oscillator
- Underdamped stochastic harmonic oscillator
- Equivalence of fluctuation-dissipation and Edwards' temperature in cyclically sheared granular systems
- Harvesting information to control non-equilibrium states of active matter
- Energy distribution and effective temperatures in a driven dissipative model
- Force renormalization for probes immersed in an active bath
- The fluctuation-dissipation relation holds for a macroscopic tracer in an active bath
- Modeling the Efficiency and Effective Temperature of Bacterial Heat Engines
- Second Law of Thermodynamics without Einstein Relation
- Nonequilibrium Langevin equation and effective temperature for particle interacting with spatially extended environment