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      Extreme active matter at high densities

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          Abstract

          We study the remarkable behaviour of dense active matter comprising self-propelled particles at large Péclet numbers, over a range of persistence times, from τ p  → 0, when the active fluid undergoes a slowing down of density relaxations leading to a glass transition as the active propulsion force f reduces, to τ p  →  , when as f reduces, the fluid jams at a critical point, with stresses along force-chains. For intermediate τ p , a decrease in f drives the fluid through an intermittent phase before dynamical arrest at low f. This intermittency is a consequence of periods of jamming followed by bursts of plastic yielding associated with Eshelby deformations. On the other hand, an increase in f leads to an increase in the burst frequency; the correlated plastic events result in large scale vorticity and turbulence. Dense extreme active matter brings together the physics of glass, jamming, plasticity and turbulence, in a new state of driven classical matter.

          Abstract

          While active matter exhibits unusual dynamics at low density, high density behavior has not been explored. Mandal et al. show that extreme dense active matter, shows a rich spectrum of behaviour from intermittent plastic bursts and turbulence, to glassy states and jamming in the limit of infinite persistence time.

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          Most cited references24

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          Plastic deformation in metallic glasses

          A.S Argon (1979)
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            The bacterial cytoplasm has glass-like properties and is fluidized by metabolic activity.

            The physical nature of the bacterial cytoplasm is poorly understood even though it determines cytoplasmic dynamics and hence cellular physiology and behavior. Through single-particle tracking of protein filaments, plasmids, storage granules, and foreign particles of different sizes, we find that the bacterial cytoplasm displays properties that are characteristic of glass-forming liquids and changes from liquid-like to solid-like in a component size-dependent fashion. As a result, the motion of cytoplasmic components becomes disproportionally constrained with increasing size. Remarkably, cellular metabolism fluidizes the cytoplasm, allowing larger components to escape their local environment and explore larger regions of the cytoplasm. Consequently, cytoplasmic fluidity and dynamics dramatically change as cells shift between metabolically active and dormant states in response to fluctuating environments. Our findings provide insight into bacterial dormancy and have broad implications to our understanding of bacterial physiology, as the glassy behavior of the cytoplasm impacts all intracellular processes involving large components. Copyright © 2014 Elsevier Inc. All rights reserved.
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              Active Brownian particles

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                Author and article information

                Contributors
                madan@ncbs.res.in
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                22 May 2020
                22 May 2020
                2020
                : 11
                : 2581
                Affiliations
                [1 ]ISNI 0000 0004 0502 9283, GRID grid.22401.35, Simons Centre for the Study of Living Machines, , National Centre for Biological Sciences (TIFR), ; Bangalore, 560065 Karnataka India
                [2 ]ISNI 0000 0001 0482 5067, GRID grid.34980.36, Centre for Condensed Matter Theory, , Department of Physics, Indian Institute of Science, ; Bangalore, 560012 Karnataka India
                [3 ]ISNI 0000 0004 0504 909X, GRID grid.462414.1, The Institute of Mathematical Sciences, ; Chennai, 600113 Tamil Nadu India
                [4 ]ISNI 0000 0004 0502 9283, GRID grid.22401.35, International Centre for Theoretical Sciences (TIFR), ; Bangalore, 560089 Karnataka India
                Author information
                http://orcid.org/0000-0002-9722-8364
                http://orcid.org/0000-0001-6210-6386
                Article
                16130
                10.1038/s41467-020-16130-x
                7244575
                32444608
                36a4a00a-7484-4c5a-8e1b-48fee76c2aa1
                © The Author(s) 2020

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 16 May 2019
                : 24 March 2020
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100001429, Indo-US Science and Technology Forum (IUSSTF);
                Award ID: IUSSTF-JC-026-2016
                Award Recipient :
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                © The Author(s) 2020

                Uncategorized
                biological physics,statistical physics
                Uncategorized
                biological physics, statistical physics

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