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arXiv 1105.3291cond-mat.stat-mech
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测试玻璃形成液体的“微观”理论

Testing "microscopic" theories of glass-forming liquids

Ludovic Berthier, Gilles Tarjus

摘要:

我们评估的有效性的玻璃形成液体的“微观”方法的基础上唯一的静态对密度相关性的知识。要做到这一点,我们将它们应用到由两个液体模型提供的基准,这两个模型共享非常相似的静态对密度关联函数,同时显示它们的弛豫时间的不同温度演变。我们发现,这种方法是不成功的描述两个模型的动力学行为的差异。我们的研究还没有详尽,我们还没有通过包括三体密度相关性等来测试添加修正的效果。然而,我们的研究结果似乎足够强大的挑战的说法,缓慢自己的玻璃形成液体,这是公认的静态结构因子随温度的变化很小,可以解释为“微观”appr oaches只需要静态对密度相关性作为非平凡的输入。

英文摘要:

We assess the validity of "microscopic" approaches of glass-forming liquids based on the sole k nowledge of the static pair density correlations. To do so we apply them to a benchmark provided by two liquid models that share very similar static pair density correlation functions while disp laying distinct temperature evolutions of their relaxation times. We find that the approaches are unsuccessful in describing the difference in the dynamical behavior of the two models. Our study is not exhausti ve, and we have not tested the effect of adding corrections by including for instance three-body density correlations. Yet, our results appear strong enough to challenge the claim that the slowd own of relaxation in glass-forming liquids, for which it is well established that the changes of the static structure factor with temperature are small, can be explained by "microscopic" appr oaches only requiring the static pair density correlations as nontrivial input.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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