Stationary and transient Fluctuation Theorems for effective heat flux between hydrodynamically coupled particles in optical traps

Abstract

We experimentally study the statistical properties of the energy fluxes between two trapped Brownian particles, interacting through dissipative hydrodynamic coupling, submitted to an effective temperature difference $\Delta T$, obtained by random forcing the position of one trap. We identify effective heat fluxes between the two particles and show that they satisfy an exchange fluctuation theorem (xFT) in the stationary state. We also show that after the sudden application of a temperature gradient $\Delta T$, \resub{the total} hot-cold flux satisfies \resub{a} transient xFT for any integration time whereas \resub{the total} cold-hot flux only does it asymptotically for long times.

References in corpus (3)

• Work fluctuations for a Brownian particle between two thermostats
• Energy flow between two hydrodynamically coupled particles kept at different effective temperatures
• Bound particle coupled to two thermostats

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