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The European Physical Journal E

, 27:149

First Online: 11 September 2008Received: 10 March 2008Accepted: 28 July 2008


We discuss general features of noise and fluctuations in active polar gels close to and away from equilibrium. We use the single-component hydrodynamic theory of active polar gels built by Kruse and coworkers to describe the cytoskeleton in cells. Close to equilibrium, we calculate the response function of the gel to external fields and introduce Langevin forces in the constitutive equations with correlation functions respecting the fluctuation-dissipation theorem. We then discuss the breakage of the fluctuation-dissipation theorem due to an external field such as the activity of the motors. Active gels away from equilibrium are considered at the scaling level. As an example of application of the theory, we calculate the density correlation function the dynamic structure factor of a compressible active polar gel and discuss possible instabilities.

PACS.87.17.Jj Cell locomotion, chemotaxis 82.70.Gg Gels and sols 82.35.Gh Polymers on surfaces; adhesion  Download to read the full article text

Autor: A. Basu - J. F. Joanny - F. Jülicher - J. Prost


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