Extreme active matter at high densities
Rituparno Mandal, Pranab Jyoti Bhuyan, Pinaki Chaudhuri, Chandan Dasgupta, Madan Rao
Abstract
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.