Active nematics on a substrate: giant number fluctuations and long-time tails

Ramaswamy, S. ; Aditi Simha, R. ; Toner, J. (2003) Active nematics on a substrate: giant number fluctuations and long-time tails EPL: Europhysics Letters, 62 (2). p. 196. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/62/2/196

Related URL: http://dx.doi.org/10.1209/epl/i2003-00346-7

Abstract

We construct the equations of motion for the coupled dynamics of order parameter and concentration for the nematic phase of driven particles on a solid surface, and show that they imply (i) giant number fluctuations, with a standard deviation proportional to the mean and (ii) long-time tails ∼t -d/2 in the autocorrelation of the particle velocities in d dimensions despite the absence of a hydrodynamic velocity field. Our predictions can be tested in experiments on aggregates of amoeboid cells as well as on layers of agitated granular matter.

Item Type:Article
Source:Copyright of this article belongs to EDP Sciences.
ID Code:39896
Deposited On:19 May 2011 10:14
Last Modified:17 May 2016 22:10

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