Semischematic model for the center-of-mass dynamics in supercooled molecular liquids

被引:19
作者
Fabbian, L
Sciortino, F
Thiery, F
Tartaglia, P
机构
[1] Univ Rome La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[2] Univ Rome La Sapienza, Ist Nazl Fis Mat, I-00185 Rome, Italy
来源
PHYSICAL REVIEW E | 1998年 / 57卷 / 02期
关键词
D O I
10.1103/PhysRevE.57.1485
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We introduce a semischematic mode-coupling model to describe the slow dynamics in molecular liquids, retaining explicitly only the description of the center-of-mass degrees of freedom. Angular degrees of freedom are condensed in a q-vector independent coupling parameter. We compare the time and q dependence of the density fluctuation correlators with numerical data from a 250-ns-long molecular dynamics simulation. Notwithstanding the choice of a network-forming liquid as a model for comparing theory and simulation, the model describes the main static and dynamic features of the relaxation in a broad q-vector range. [S1063-651X(98)03201-2].
引用
收藏
页码:1485 / 1488
页数:4
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