2000 character limit reached
The fluctuation-dissipation relation holds for a macroscopic tracer in an active bath
Published 7 Jan 2024 in cond-mat.stat-mech | (2401.03509v2)
Abstract: The fluctuation-dissipation relation (FDR) links thermal fluctuations and dissipation at thermal equilibrium through temperature. Extending it beyond equilibrium conditions in pursuit of broadening thermodynamics is often feasible, albeit with system-dependent specific conditions. We demonstrate experimentally that a generalized FDR holds for a harmonically trapped tracer colliding with self-propelled walkers. The generalized FDR remains valid across a large spectrum of active fluctuation frequencies, extending from underdamped to critically damped dynamics, which we attribute to a single primary channel for energy input and dissipation in our system.
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- The mean free time between collisions τcsubscript𝜏𝑐\tau_{c}italic_τ start_POSTSUBSCRIPT italic_c end_POSTSUBSCRIPT was estimated by tracking both the bbots and the tracer, averaging over the times in which there’s no physical contact between the bots and the tracer.
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