Nonequilibrium Probability Currents in Optically-Driven Colloidal Suspensions
arXiv:2310.12718 · doi:10.21468/SciPostPhys.17.4.096
Abstract
In the absence of directional motion it is often hard to recognize athermal fluctuations. Probability currents provide such a measure in terms of the rate at which they enclose area in the reduced phase space. We measure this area enclosing rate for trapped colloidal particles, where only one particle is driven. By combining experiment, theory, and simulation, we single out the effect of the different time scales in the system on the measured probability currents. In this controlled experimental setup, particles interact hydrodynamically. These interactions lead to a strong spatial dependence of the probability currents and to a local influence of athermal agitation. In a multiple-particle system, we show that even when the driving acts only on one particle, probability currents occur between other, non-driven particles. This may have significant implications for the interpretation of fluctuations in biological systems containing elastic networks in addition to a suspending fluid.
Submission to SciPost Physics
References in corpus (27)
- Broken detailed balance and non-equilibrium dynamics in living systems
- Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface
- Holographic optical trapping
- Non-equilibrium mechanics and dynamics of motor activated gels
- Quantifying dissipation using fluctuating currents
- Non-equilibrium microtubule fluctuations in a model cytoskeleton
- Anomalous hydrodynamic interaction in a quasi-two-dimensional suspension
- Effective Temperature of Red Blood Cell Membrane Fluctuations
- Fluctuations and Rheology in Active Bacterial Suspensions
- Inferring broken detailed balance in the absence of observable currents
- Hydrodynamic interaction in confined geometries
- Broken Detailed Balance of Filament Dynamics in Active Networks
- Variance Sum Rule for Entropy Production
- Stationary and transient Fluctuation Theorems for effective heat flux between hydrodynamically coupled particles in optical traps
- Effective temperatures and activated dynamics for a two-dimensional air-driven granular system on two approaches to jamming
- Energy flow between two hydrodynamically coupled particles kept at different effective temperatures
- Non-equilibrium scaling behaviour in driven soft biological assemblies
- Collective excitations of hydrodynamically coupled driven colloidal particles
- Rapid-Prototyping a Brownian Particle in an Active Bath
- Learning the Non-Equilibrium Dynamics of Brownian Movies
- Experimental metrics for detection of detailed balance violation
- Nonequilibirum steady state for harmonically-confined active particles
- Nonequilibrium oscillations, probability angular momentum, and the climate system
- Optical trapping below the diffraction limit with a tunable beam waist using super-oscillating beams
- Scaling behavior of non-equilibrium measures in internally driven elastic assemblies
- Mesoscopic non-equilibrium measures can reveal intrinsic features of the active driving
- The Spatial Crossover between Far-From-Equilibrium and Near-Equilibrium Dynamics in Locally Driven Suspensions