Comment on "Long-lived giant number fluctuations in a swarming granular nematic"

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 clust...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2008-05, Vol.320 (5876), p.612; author reply 612-612
Main Authors: Aranson, I S, Snezhko, A, Olafsen, J S, Urbach, J S
Format: Article
Language:English
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1153456