López-Flores Leticia, Ruíz-Estrada Honorina, Chávez-Páez Martín, Medina-Noyola Magdaleno
Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Apartado Postal 1152, 72000 Puebla, PUE., México.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Oct;88(4):042301. doi: 10.1103/PhysRevE.88.042301. Epub 2013 Oct 2.
We perform systematic simulation experiments on model systems with soft-sphere repulsive interactions to test the predicted dynamic equivalence between soft-sphere liquids with similar static structure. For this we compare the simulated dynamics (mean squared displacement, intermediate scattering function, α-relaxation time, etc.) of different soft-sphere systems, between them and with the hard-sphere liquid. We then show that the referred dynamic equivalence does not depend on the (Newtonian or Brownian) nature of the microscopic laws of motion of the constituent particles, and hence, applies independently to colloidal and to atomic simple liquids. Finally, we verify another more recently proposed dynamic equivalence, this time between the long-time dynamics of an atomic liquid and its corresponding Brownian fluid (i.e., the Brownian system with the same interaction potential).
我们对具有软球排斥相互作用的模型系统进行了系统的模拟实验，以测试具有相似静态结构的软球液体之间预测的动力学等效性。为此，我们比较了不同软球系统的模拟动力学（均方位移、中间散射函数、α弛豫时间等），以及它们与硬球液体之间的模拟动力学。然后我们表明，上述动力学等效性并不取决于组成粒子微观运动定律的（牛顿或布朗）性质，因此，独立适用于胶体和原子简单液体。最后，我们验证了另一种最近提出的动力学等效性，这次是在原子液体的长时间动力学与其相应的布朗流体（即具有相同相互作用势的布朗系统）之间。
