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Extreme active matter at high densities.

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 ?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 ?p ? ?, when as f reduces, the fluid jams at a critical point, with stresses along force-chains. For intermediate ?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.

SUBMITTER: Mandal R

PROVIDER: S-EPMC7244575 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Extreme active matter at high densities.

Mandal Rituparno R Bhuyan Pranab Jyoti PJ Chaudhuri Pinaki P Dasgupta Chandan C Rao Madan M

Nature communications 20200522 1

We study the remarkable behaviour of dense active matter comprising self-propelled particles at large Péclet numbers, over a range of persistence times, from τp → 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 τp → ∞, when as f reduces, the fluid jams at a critical point, with stresses along force-chains. For intermediate τp, a decrease in f drives the fluid throu ...[more]

PMID: 32444608

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