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Journal Article

Casimir stresses in active nematic films

MPS-Authors
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Basu,  Abhik
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Jülicher,  Frank
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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1905.02456.pdf
(Preprint), 217KB

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Citation

Basu, A., Joanny, J.-F., Jülicher, F., & Prost, J. (2019). Casimir stresses in active nematic films. New Journal of Physics, 21(12): 123046. doi:10.1088/1367-2630/ab5628.


Cite as: http://hdl.handle.net/21.11116/0000-0006-0A4B-C
Abstract
We calculate the Casimir stresses in a thin layer of active fluid with nematic order. By using a stochastic hydrodynamic approach for an active fluid layer of finite thickness L, we generalize the Casimir stress for nematic liquid crystals in thermal equilibrium to active systems. We show that the active Casimir stress differs significantly from its equilibrium counterpart. For contractile activity, the active Casimir stress, although attractive like its equilibrium counterpart, diverges logarithmically as L approaches a threshold of the spontaneous flow instability from below. In contrast, for small extensile activity, it is repulsive, has no divergence at any L and has a scaling with L different from its equilibrium counterpart.