Dasgupta, Chandan ; Valls, Oriol T. (1994) Two distinct time scales in the dynamics of a dense hard-sphere liquid Physical Review E, 50 (5). pp. 3916-3924. ISSN 1063-651X
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Official URL: http://pre.aps.org/abstract/PRE/v50/i5/p3916_1
Related URL: http://dx.doi.org/10.1103/PhysRevE.50.3916
Abstract
The dynamic behavior of a dense hard-sphere liquid is studied by numerically integrating a set of Langevin equations that incorporate a free energy functional of the Ramakrishnan-Yussouff form. At relatively low densities, the system remains, during the time scale of our simulation, in the neighborhood of the metastable local minimum of the free energy that represents a uniform liquid. At higher densities, the system is found to fluctuate near the uniform liquid minimum for a characteristic period of time before making a transition to an inhomogeneous minimum of the free energy. The time that the system spends in the vicinity of the liquid minimum before making a transition to another one defines a new time scale of the dynamics. This time scale is found to decrease sharply as the density is increased above a characteristic value. Implications of these observations on the interpretation of experimental and numerical data on the dynamics of supercooled liquids are discussed.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 22821 |
Deposited On: | 24 Nov 2010 08:33 |
Last Modified: | 24 Nov 2010 08:33 |
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