Nonequilibrium Probability Currents in Optically-Driven Colloidal Suspensions
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866913525780185088 |
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| author | Thapa, Samudrajit Zaretzky, Daniel Vatash, Ron Gradziuk, Grzegorz Broedersz, Chase Shokef, Yair Roichman, Yael |
| author_facet | Thapa, Samudrajit Zaretzky, Daniel Vatash, Ron Gradziuk, Grzegorz Broedersz, Chase Shokef, Yair Roichman, Yael |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_12718 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nonequilibrium Probability Currents in Optically-Driven Colloidal Suspensions Thapa, Samudrajit Zaretzky, Daniel Vatash, Ron Gradziuk, Grzegorz Broedersz, Chase Shokef, Yair Roichman, Yael Soft Condensed Matter Biological Physics 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. |
| title | Nonequilibrium Probability Currents in Optically-Driven Colloidal Suspensions |
| topic | Soft Condensed Matter Biological Physics |
| url | https://arxiv.org/abs/2310.12718 |