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When an active bath behaves as an equilibrium one

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Chaudhuri,  Debasish
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Khali, S. S., Peruani, F., & Chaudhuri, D. (2024). When an active bath behaves as an equilibrium one. Physical Review E, 109(2): 024120. doi:10.1103/PhysRevE.109.024120.


Cite as: https://hdl.handle.net/21.11116/0000-000F-30B2-1
Abstract
Active scalar baths consisting of active Brownian particles are characterized by a non -Gaussian velocity distribution, a kinetic temperature, and a diffusion coefficient that scale with the square of the active velocity V0. While these results hold in overdamped active systems, inertial effects lead to normal velocity distributions, with kinetic temperature and diffusion coefficient increasing as similar to V-0(alpha) with 1 < alpha < 2. Remarkably, the late -time diffusivity and mobility decrease with mass. Moreover, we show that the equilibrium Einstein relation is asymptotically recovered with inertia. In summary, the inertial mass restores an equilibriumlike behavior.