Time scales for transitions between free-energy minima of a dense hard-sphere system.
Time scales for transitions between free-energy minima of a dense hard-sphere system.
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致密硬球系统自由能最小值之间转变的时间尺度。
DOI：
10.1103/physreve.53.2603
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
O. Valls
中科院分区：
文献类型：
--
作者：
C. Dasgupta;O. Valls
用一种新的蒙特卡罗方法计算了适合于致密硬球系统的自由能泛函的玻璃亚稳态之间的激活跃迁的时间尺度。特别是，我们计算了系统最初处于自由能的浅玻璃最小值，在过渡到另一个自由能最小值的吸引力盆地之前，在这个最小值附近花费的时间。这个时间尺度随着平均密度的增加而增加。我们发现在一个交叉密度附近，这个时间尺度急剧增加，并且变得比我们模拟中可以获得的最长时间更长。这个时间尺度没有显示出随样本量增加而增加的任何证据
Time scales associated with activated transitions between glassy metastable states of a free-energy functional appropriate for a dense hard-sphere system are calculated by using a new Monte Carlo method for the local density variables. In particular, we calculate the time the system, initially placed in a shallow glassy minimum of the free-energy, spends in the neighborhood of this minimum before making a transition to the basin of attraction of another free-energy minimum. This time scale is found to increase as the average density is increased. We find a crossover density near which this time scale increases very sharply and becomes longer than the longest times accessible in our simulation. This time scale does not show any evidence of increasing with sample size