From single-particle to collective effective temperatures in an active fluid of self-propelled particles

Abstract

We present a comprehensive analysis of effective temperatures based on fluctuation-dissipation relations in a model of an active fluid composed of self-propelled hard disks. We first investigate the relevance of effective temperatures in the dilute and moderately dense fluids. We find that a unique effective temperature does not in general characterize the non-equilibrium dynamics of the active fluid over this broad range of densities, because fluctuation-dissipation relations yield a lengthscale-dependent effective temperature. By contrast, we find that the approach to a non-equilibrium glass transition at very large densities is accompanied by the emergence of a unique effective temperature shared by fluctuations at all lengthscales. This suggests that an effective thermal dynamics generically emerges at long times in very dense suspensions of active particles due to the collective freezing occurring at non-equilibrium glass transitions.

6 pages, 3 figs

References in corpus (11)

• Statistical Mechanics of Interacting Run-and-Tumble Bacteria
• Sedimentation, trapping, and rectification of dilute bacteria
• A self-propelled particle in an external potential: is there an effective temperature?
• Effective Interactions in Active Brownian Suspensions
• Generalized energy equipartition in harmonic oscillators driven by active baths
• Effective Temperature of Red Blood Cell Membrane Fluctuations
• Glassy dynamics of athermal self-propelled particles: Computer simulations and a nonequilibrium microscopic theory
• Clustering and heterogeneous dynamics in a kinetic Monte-Carlo model of self-propelled hard disks
• Do Binary Hard Disks Exhibit an Ideal Glass Transition?
• Effective temperature and glassy dynamics of active matter
• Dynamics of a homogeneous active dumbbell system

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