Large-scale chaos and fluctuations in active nematics

Sandrine Ngo, Anton Peshkov, Igor S. Aranson, Eric Bertin, Francesco Ginelli, Hugues Chaté

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We show that dry active nematics, e.g., collections of shaken elongated granular particles, exhibit large-scale spatiotemporal chaos made of interacting dense, ordered, bandlike structures in a parameter region including the linear onset of nematic order. These results are obtained from the study of both the well-known (deterministic) hydrodynamic equations describing these systems and of the self-propelled particle model they were derived from. We prove, in particular, that the chaos stems from the generic instability of the band solution of the hydrodynamic equations. Revisiting the status of the strong fluctuations and long-range correlations in the particle model, we show that the giant number fluctuations observed in the chaotic phase are a trivial consequence of density segregation. However anomalous, curvature-driven number fluctuations are present in the homogeneous quasiordered nematic phase and characterized by a nontrivial scaling exponent.

Original languageEnglish (US)
Article number038302
JournalPhysical Review Letters
Volume113
Issue number3
DOIs
StatePublished - Jul 16 2014

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chaos
hydrodynamic equations
stems
curvature
exponents
scaling

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Ngo, Sandrine ; Peshkov, Anton ; Aranson, Igor S. ; Bertin, Eric ; Ginelli, Francesco ; Chaté, Hugues. / Large-scale chaos and fluctuations in active nematics. In: Physical Review Letters. 2014 ; Vol. 113, No. 3.
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Ngo, S, Peshkov, A, Aranson, IS, Bertin, E, Ginelli, F & Chaté, H 2014, 'Large-scale chaos and fluctuations in active nematics', Physical Review Letters, vol. 113, no. 3, 038302. https://doi.org/10.1103/PhysRevLett.113.038302

Large-scale chaos and fluctuations in active nematics. / Ngo, Sandrine; Peshkov, Anton; Aranson, Igor S.; Bertin, Eric; Ginelli, Francesco; Chaté, Hugues.

In: Physical Review Letters, Vol. 113, No. 3, 038302, 16.07.2014.

Research output: Contribution to journalArticle

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