Technical Comments

Comment on "Long-Lived Giant Number Fluctuations in a Swarming Granular Nematic"

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Science  02 May 2008:
Vol. 320, Issue 5876, pp. 612
DOI: 10.1126/science.1153456

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Narayan et al. (Reports, 6 July 2007, p. 105) reported giant number fluctuations attributed to curvature-driven active currents specific for nonequilibrium nematic systems. We present data demonstrating that similar results can be found in systems of spherical particles due either to inelastic clustering or persistent density inhomogeneity, suggesting two alternative explanations for their results.

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