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Analogies between growing dense active matter and soft driven glasses

Tjhung, Elsen; Berthier, Ludovic

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Authors

Elsen Tjhung

Ludovic Berthier



Abstract

We develop a minimal model to describe growing dense active matter such as biological tissues, bacterial colonies, and biofilms, which are driven by a competition between particle division and steric repulsion. We provide a detailed numerical analysis of collective and single-particle dynamics. We show that the microscopic dynamics can be understood as the superposition of an affine radial component due to the global growth, and of a more complex nonaffine component that displays features typical of driven soft glassy materials, such as aging, compressed exponential decay of time correlation functions, and a crossover from superdiffusive behavior at short scales to subdiffusive behavior at larger scales. This analogy emerges because particle division at the microscale leads to a global expansion, which then plays a role analogous to shear flow in soft driven glasses. We conclude that growing dense active matter and sheared dense suspensions can generically be described by the same underlying physics.

Citation

Tjhung, E., & Berthier, L. (2020). Analogies between growing dense active matter and soft driven glasses. Physical Review Research, 2(4), Article 043334. https://doi.org/10.1103/physrevresearch.2.043334

Journal Article Type Article
Acceptance Date Nov 19, 2020
Online Publication Date Dec 7, 2020
Publication Date 2020
Deposit Date Sep 14, 2021
Publicly Available Date Sep 14, 2021
Journal Physical Review Research
Electronic ISSN 2643-1564
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 2
Issue 4
Article Number 043334
DOI https://doi.org/10.1103/physrevresearch.2.043334

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.




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