Generalized Casimir forces in non-equilibrium systems

Details Generalized Casimir forces in non-equilibrium systems Generalized Casimir forces in non-equilibrium systems

2006-11-08

arxiv.org/abs/cond-mat/0611233v1

Physics

Condensed Matter

Statistical Mechanics

Submitted to Europhysics Letters. 7 pages, 2 figures

Scientific paper

10.1103/PhysRevE.76.011113

In the present work we propose a method to determine fluctuation induced forces in non equilibrium systems. These forces are the analogue of the well known Casimir forces, which were originally introduced in Quantum Field theory and later extended to the area of Critical Phenomena. The procedure starts from the observation that many non equilibrium systems exhibit long-range correlations and the associated structure factors diverge in the long wavelength limit. The introduction of external bodies into such systems in general modifies the spectrum of these fluctuations and leads to the appearance of a net force between these bodies. The mechanism is illustrated by means of a simple example: a reaction diffusion equation with random noises.

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