Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7375027 | Physica A: Statistical Mechanics and its Applications | 2018 | 21 Pages |
Abstract
By means of molecular dynamics simulations, we study the non-Gaussian diffusion in the fluid of Hertzian spheres. The time dependent non-Gaussian parameter, as an indicator of the dynamic heterogeneity, is increased with the increasing of temperature. When the temperature is high enough, the dynamic heterogeneity becomes very significant, and it seems counterintuitive that the maximum of non-Gaussian parameter and the position of its peak decrease monotonically with the increasing of density. By fitting the curves of self intermediate scattering function, we find that the character relaxation time Ïα is surprisingly not coupled with the time Ïmax where the non-Gaussian parameter reaches to a maximum. The intriguing features of non-Gaussian diffusion at high enough temperatures can be associated with the weakly correlated mean-field behavior of Hertzian spheres. Especially the time Ïmax is nearly inversely proportional to the density at extremely high temperatures.
Related Topics
Physical Sciences and Engineering
Mathematics
Mathematical Physics
Authors
Wenze Ouyang, Bin Sun, Zhiwei Sun, Shenghua Xu,