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Quantitative tests of mode-coupling theory for fragile and strong glass-formers

机译:脆弱强模态耦合理论的定量检验   玻璃形成体

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摘要

We calculate for a binary mixture of Lennard-Jones particles the timedependence of the solution of the mode-coupling equations in which the fullwave vector dependence is taken into account. In addition we also take intoaccount the short time dynamics, which we model with a simple memory kernel. Wefind that the so obtained solution agrees very well with the time and wavevector dependence of the coherent and incoherent intermediate scatteringfunctions as determined from molecular dynamics computer simulations.Furthermore we calculate the wave vector dependence of the Debye-Waller factorfor a realistic model of silica and compare these results with the onesobtained from a simulation of this model. We find that if the contribution ofthe three point correlation function to the vertices of the memory kernel aretaken into account, the agreement between theory and simulation is very good.Hence we conclude that mode coupling theory is able to give a correctquantitative description of the caging phenomena in fragile as well as strongglass-forming liquids.
机译:我们为Lennard-Jones粒子的二元混合物计算了模式耦合方程解的时间相关性,其中考虑了全波矢量相关性。此外,我们还考虑了短时动态特性,我们使用简单的内存内核对其进行建模。我们发现这样获得的解与分子动力学计算机仿真确定的相干和非相干中间散射函数的时间和波矢量相关性非常吻合,此外,我们还计算了Debye-Waller因子对矢量的真实模型的波矢量相关性并进行了比较这些结果与从该模型的仿真中获得的结果相同。我们发现,如果考虑到三点相关函数对存储核顶点的贡献,理论与仿真之间的一致性就很好。因此,我们得出结论,模式耦合理论能够对笼统现象给出正确的定量描述。易碎以及形成强玻璃的液体。

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