Ref HAL: hal-00522291_v1
PMID 21230079
Ref Arxiv: 1006.4422
DOI: 10.1103/PhysRevE.82.031503
WoS: 000282134100008
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
42 Citations
Résumé:

We study the nonequilibrium aging dynamics in a system of quasi-hard spheres at large density by means of computer simulations. We find that, after a sudden quench to large density, the relaxation time initially increases exponentially with the age of the system. After a surprisingly large crossover time, the system enters the asymptotic aging regime characterized by a linear increase of the relaxation time with age. In this aging regime, single particle motion is strongly non-Fickian, with a mean-squared displacement increasing subdiffusively, associated to broad, non-Gaussian tails in the distribution of particle displacements. We find that the system ages through temporally intermittent relaxation events, and a detailed finite size analysis of these collective dynamic fluctuations reveals that these events are not spanning the entire system, but remain spatially localized.

Commentaires: 11 pages; 10 figs