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Slow coarsening in jammed athermal soft particle suspensions.

Chacko, R. N. and Sollich, P. and Fielding, S. M. (2019) 'Slow coarsening in jammed athermal soft particle suspensions.', Physical review letters., 123 (10). p. 108001.


We simulate a densely jammed, athermal assembly of repulsive soft particles immersed in a solvent. Starting from an initial condition corresponding to a quench from a high temperature, we find nontrivial slow dynamics driven by a gradual release of stored elastic energy, with the root mean squared particle speed decaying as a power law in time with a fractional exponent. This decay is accompanied by the presence within the assembly of spatially localized and temporally intermittent “hot spots” of nonaffine deformation, connected by long-ranged swirls in the velocity field, reminiscent of the local plastic events and long-ranged elastic propagation that have been intensively studied in sheared amorphous materials. The pattern of hot spots progressively coarsens, with the hot-spot size and separation slowly growing over time, and the associated correlation length in particle speed increasing as a sublinear power law. Each individual spot, however, exists only transiently within an overall picture of strongly intermittent dynamics.

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Publisher statement:Reprinted with permission from the American Physical Society: Chacko, R. N., Sollich, P. & Fielding, S. M. (2019). Slow Coarsening in Jammed Athermal Soft Particle Suspensions. Physical Review Letters 123(10): 108001 © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:07 August 2019
Date deposited:10 September 2019
Date of first online publication:04 September 2019
Date first made open access:10 September 2019

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