Generic Long-Range Interactions Between Passive Bodies in an Active Fluid
Name
PhysRevLett.120.058002.pdf
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335.09 KB
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Checksum (MD5)
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Author(s)
Baek, Yongjoo
Xu, Xinpeng
Nikola, Nikolai
Kafri, Yariv
Solon, Alexandre
Date Issued
January 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Baek, Yongjoo et al. "Generic Long-Range Interactions Between Passive Bodies in an Active Fluid." Physics Review Letters 120, 5 (January 2018): 058002 © 2018 American Physical Society
Version
Final published version
Abstract
A single nonspherical body placed in an active fluid generates currents via breaking of time-reversal symmetry. We show that, when two or more passive bodies are placed in an active fluid, these currents lead to long-range interactions. Using a multipole expansion, we characterize their leading-order behaviors in terms of single-body properties and show that they decay as a power law with the distance between the bodies, are anisotropic, and do not obey an action-reaction principle. The interactions lead to rich dynamics of the bodies, illustrated by the spontaneous synchronized rotation of pinned nonchiral bodies and the formation of traveling bound pairs. The occurrence of these phenomena depends on tunable properties of the bodies, thus opening new possibilities for self-assembly mediated by active fluids.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.058002
