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A particle-field approach bridges phase separation and collective motion in active matter

Author

Listed:
  • Robert Großmann

    (Université Côte d’Azur, UMR 7351 CNRS
    University of Potsdam)

  • Igor S. Aranson

    (Pennsylvania State University)

  • Fernando Peruani

    (Université Côte d’Azur, UMR 7351 CNRS
    UMR 8089, CY Cergy Paris Université)

Abstract

Whereas self-propelled hard discs undergo motility-induced phase separation, self-propelled rods exhibit a variety of nonequilibrium phenomena, including clustering, collective motion, and spatio-temporal chaos. In this work, we present a theoretical framework representing active particles by continuum fields. This concept combines the simplicity of alignment-based models, enabling analytical studies, and realistic models that incorporate the shape of self-propelled objects explicitly. By varying particle shape from circular to ellipsoidal, we show how nonequilibrium stresses acting among self-propelled rods destabilize motility-induced phase separation and facilitate orientational ordering, thereby connecting the realms of scalar and vectorial active matter. Though the interaction potential is strictly apolar, both, polar and nematic order may emerge and even coexist. Accordingly, the symmetry of ordered states is a dynamical property in active matter. The presented framework may represent various systems including bacterial colonies, cytoskeletal extracts, or shaken granular media.

Suggested Citation

  • Robert Großmann & Igor S. Aranson & Fernando Peruani, 2020. "A particle-field approach bridges phase separation and collective motion in active matter," Nature Communications, Nature, vol. 11(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18978-5
    DOI: 10.1038/s41467-020-18978-5
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    Cited by:

    1. Chiao-Peng Hsu & Alfredo Sciortino & Yu Alice Trobe & Andreas R. Bausch, 2022. "Activity-induced polar patterns of filaments gliding on a sphere," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Solenn Riedel & Ludwig A. Hoffmann & Luca Giomi & Daniela J. Kraft, 2024. "Designing highly efficient interlocking interactions in anisotropic active particles," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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