Fluctuation-Induced Forces in Nonequilibrium Diffusive Dynamics
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PhysRevLett.114.230602.pdf
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264.83 KB
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Author(s)
Aminov, Avi
Kafri, Yariv
Kardar, Mehran
Date Issued
June 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aminov, Avi, Yariv Kafri, and Mehran Kardar. “Fluctuation-Induced Forces in Nonequilibrium Diffusive Dynamics.” Physical Review Letters 114, no. 23 (June 2015). © 2015 American Physical Society
Version
Final published version
Abstract
Fluctuations in nonequilibrium steady states generically lead to power law decay of correlations for conserved quantities. Embedded bodies which constrain fluctuations, in turn, experience fluctuation induced forces. We compute these forces for the simple case of parallel slabs in a driven diffusive system. Our model calculations show that the force falls off with slab separation d as k[subscript B]T/d (at temperature T, and in all spatial dimensions) but can be attractive or repulsive. Unlike the equilibrium Casimir force, the force amplitude is nonuniversal and explicitly depends on dynamics. The techniques introduced can be used to study pressure and fluctuation induced forces in a broad class of nonequilibrium systems.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.114.230602
