Large-Scale Chaos and Fluctuations in Active Nematics - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Physical Review Letters Year : 2014

Large-Scale Chaos and Fluctuations in Active Nematics


We show that " dry " active nematics, e.g. collections of shaken elongated granular particles, exhibit large-scale spatiotemporal chaos made of interacting dense, ordered, band-like structures in a parameter region including the linear onset of nematic order. These results are obtained from the study of the relatively simple and well-known (deterministic) hydrodynamic equations describing these systems in a dilute limit, and of a self-propelled particle Vicsek-like model for this class of active matter. In this last case, revisiting the status of the strong fluctuations and long-range correlations now considered as landmarks of orientationally-ordered active phases, we show that the giant number fluctuations observed in the chaotic phase are a trivial consequence of density segregation. However anomalous density fluctuations are present in the homogeneous quasi-ordered nematic phase and characterized by a non-trivial scaling exponent.
Fichier principal
Vignette du fichier
1312.1076v1.pdf (577.32 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

cea-01384279 , version 1 (19-10-2016)



Sandrine Ngo, Anton Peshkov, Igor S. Aranson, Eric Bertin, Francesco Ginelli, et al.. Large-Scale Chaos and Fluctuations in Active Nematics. Physical Review Letters, 2014, 113 (3), pp.38302. ⟨10.1103/PhysRevLett.113.038302⟩. ⟨cea-01384279⟩
214 View
125 Download



Gmail Mastodon Facebook X LinkedIn More