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Fluctuation spectra...
Fluctuation spectra and force generation in nonequilibrium systems
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Lee, Alpha A. (author)
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Vella, Dominic (author)
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- Wettlaufer, John S. (author)
- KTH,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),University of Oxford, UK; Yale University, USA,Nordic Institute for Theoretical Physics NORDITA
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(creator_code:org_t)
- 2017-08-15
- 2017
- English.
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In: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 114:35, s. 9255-9260
- Related links:
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https://www.pnas.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Many biological systems are appropriately viewed as passive inclusions immersed in an active bath: from proteins on active membranes to microscopic swimmers confined by boundaries. The nonequilibrium forces exerted by the active bath on the inclusions or boundaries often regulate function, and such forces may also be exploited in artificial active materials. Nonetheless, the general phenomenology of these active forces remains elusive. We show that the fluctuation spectrum of the active medium, the partitioning of energy as a function of wavenumber, controls the phenomenology of force generation. We find that, for a narrow, unimodal spectrum, the force exerted by a nonequilibrium system on two embedded walls depends on the width and the position of the peak in the fluctuation spectrum, and oscillates between repulsion and attraction as a function of wall separation. We examine two apparently disparate examples: the Maritime Casimir effect and recent simulations of active Brownian particles. A key implication of our work is that important nonequilibrium interactions are encoded within the fluctuation spectrum. In this sense, the noise becomes the signal.
Subject headings
- NATURVETENSKAP -- Annan naturvetenskap (hsv//swe)
- NATURAL SCIENCES -- Other Natural Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Biofysik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biophysics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
Keyword
- Casimir effect
- nonequilibrium physics
- fluctuations
- active matter
Publication and Content Type
- ref (subject category)
- art (subject category)
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