Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C47: Disordered and Glassy Systems
2:30 PM–5:30 PM,
Monday, March 5, 2018
LACC Room: 507
Sponsoring Units: GSOFT DCP GSNP
Chair: Yang Zhang, University of Illinois at Urbana–Champaign
Abstract: C47.00001 : Cooperative Rearrangements in Aging Colloidal Glass Simulations: Log-Poisson Statistics*
2:30 PM–2:42 PM
(Physics, Emory University)
Physical aging is a non-equilibrium relaxation process which takes place after a system is quenched into a glassy state. One of the unexplained features of aging is that the process stagnates on a non-exponential time scale. We posit that the intermittent, irreversible rearrangements noted in aging colloidal glasses are permitted by record-breaking fluctuations of local dynamics. If such events are the sole mechanism of relaxation, this would make aging appear as a Poisson process when viewed on a logarithmic time scale. We examine data from MD simulations, an experimental system, and a coarse grained model. We show that the age-dependent rate of rearrangement events is consistent with a Log-Poisson process, and thus provide a possible explanation for the anomalous time-dependence of dynamical properties of a wide variety of glassy systems.
*This work is supported by the NSF through grant DMR-1207431.
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