Fluctuations of fluctuation-induced Casimir-like forces

Bartolo, D.; Ajdari, A.; Fournier, J. B.; Golestanian, R.

doi:10.1103/PhysRevLett.89.230601

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Fluctuations of fluctuation-induced Casimir-like forces

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Golestanian, R.
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Bartolo, D., Ajdari, A., Fournier, J. B., & Golestanian, R. (2002). Fluctuations of fluctuation-induced Casimir-like forces. Physical Review Letters, 89(23): 230601. doi:10.1103/PhysRevLett.89.230601.

Cite as: https://hdl.handle.net/21.11116/0000-0001-ACA8-0

Abstract

The force experienced by objects embedded in a correlated medium undergoing thermal fluctuations—the so-called fluctuation-induced force—is actually itself a fluctuating quantity. Using a scalar field model, we compute the corresponding probability distribution and show that it is a Gaussian centered on the well-known Casimir force, with a nonuniversal standard deviation that can be typically as large as the mean force itself. The relevance of these results to the experimental measurement of fluctuation-induced forces in soft condensed matter is discussed, as well as the influence of the finite temporal resolution of the measuring apparatus. © 2002 The American Physical Society.