Resumé
The applicability to dense hard sphere colloidal suspensions of a general coarse-graining approach called Record Dynamics (RD) is tested by extensive molecular dynamics simulations. We reproduce known results as logarithmic diffusion and the logarithmic decay of the average potential energy per particle. We provide quantitative measures for the cage size and identify the displacements of single particles corresponding to intermittent cage breakings. We then partition the system into spatial domains and show that, within each domain, a subset of such intermittent events called quakes constitutes a log-Poisson process, as predicted by RD. Specifically, quakes are shown to be statistically independent and Poisson distributed with an average depending on the logarithm of time. Finally, we discuss the nature of the dynamical barriers surmounted by quakes and link RD to the phenomenology of aging hard sphere colloids.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 042607 |
| Tidsskrift | Physical Review E. Statistical, Nonlinear, and Soft Matter Physics |
| Vol/bind | 99 |
| Udgave nummer | 4 |
| Antal sider | 8 |
| ISSN | 2470-0045 |
| DOI | |
| Status | Udgivet - 17. apr. 2019 |
Fingeraftryk
Emneord
- cond-mat.stat-mech
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Dynamics of dense hard sphere colloidal systems : A numerical analysis. / Sibani, Paolo; Svaneborg, Carsten.
I: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, Bind 99, Nr. 4, 042607, 17.04.2019.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
TY - JOUR
T1 - Dynamics of dense hard sphere colloidal systems
T2 - A numerical analysis
AU - Sibani, Paolo
AU - Svaneborg, Carsten
N1 - 7 pages, 8 figures
PY - 2019/4/17
Y1 - 2019/4/17
N2 - The applicability to dense hard sphere colloidal suspensions of a general coarse-graining approach called Record Dynamics (RD) is tested by extensive molecular dynamics simulations. We reproduce known results as logarithmic diffusion and the logarithmic decay of the average potential energy per particle. We provide quantitative measures for the cage size and identify the displacements of single particles corresponding to intermittent cage breakings. We then partition the system into spatial domains and show that, within each domain, a subset of such intermittent events called quakes constitutes a log-Poisson process, as predicted by RD. Specifically, quakes are shown to be statistically independent and Poisson distributed with an average depending on the logarithm of time. Finally, we discuss the nature of the dynamical barriers surmounted by quakes and link RD to the phenomenology of aging hard sphere colloids.
AB - The applicability to dense hard sphere colloidal suspensions of a general coarse-graining approach called Record Dynamics (RD) is tested by extensive molecular dynamics simulations. We reproduce known results as logarithmic diffusion and the logarithmic decay of the average potential energy per particle. We provide quantitative measures for the cage size and identify the displacements of single particles corresponding to intermittent cage breakings. We then partition the system into spatial domains and show that, within each domain, a subset of such intermittent events called quakes constitutes a log-Poisson process, as predicted by RD. Specifically, quakes are shown to be statistically independent and Poisson distributed with an average depending on the logarithm of time. Finally, we discuss the nature of the dynamical barriers surmounted by quakes and link RD to the phenomenology of aging hard sphere colloids.
KW - cond-mat.stat-mech
U2 - 10.1103/PhysRevE.99.042607
DO - 10.1103/PhysRevE.99.042607
M3 - Journal article
VL - 99
JO - Physical Review E
JF - Physical Review E
SN - 2470-0045
IS - 4
M1 - 042607
ER -