Forces Induced by Non-Equilibrium Fluctuations: The Soret-Casimir Effect

Details Forces Induced by Non-Equilibrium Fluctuations: The Soret-Casimir Effect Forces Induced by Non-Equilibrium Fluctuations: The Soret-Casimir Effect

2003-08-19

arxiv.org/abs/cond-mat/0308373v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 5 postscript figures, uses (old) RevTex

Scientific paper

10.1209/epl/i2004-10275-5

The notion of fluctuation-induced forces is generalized to the cases where the fluctuations have nonequilibrium origin. It is shown that a net force is exerted on a single flat plate that restricts scale-free fluctuations of a scalar field in a temperature gradient. This force tends to push the object to the colder regions, which is a manifestation of thermophoresis or the Soret effect. In the classic two-plate geometry, it is shown that the Casimir forces exerted on the two plates differ from each other, and thus the Newton's third law is violated.

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