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arXiv 1405.0195cond-mat.dis-nnmath.DS
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随机网络上易化自旋模型动力学的解析方法

Analytical approach to the dynamics of facilitated spin models on random networks

Peter G. Fennell, James P. Gleeson, Davide Cellai

摘要:

几十年前引入了易化自旋模型来模拟以玻璃化转变为特征的系统。最近的发展表明,一类促进自旋模型也能够再现特征签名的玻璃形成液体的结构弛豫性能。虽然这些模型的平衡相图可以解析计算,动力学通常是数值研究。在这里,我们提出了一种新的基于网络的方法,称为近似主方程(AME),弗雷德里克森-安德森模型的动力学。该方法正确地预测了发生玻璃化转变的临界温度。我们还发现理论和数值模拟的瞬态制度之间的良好协议,除了在接近的液体玻璃化转变。最后,我们分析了该模型的关键集群的特征,并表明我们的AME方法和蒙特卡罗之间的偏离可以与冻结和未冻结的自旋之间的大界面在接近玻璃化转变的温度。

英文摘要:

Facilitated spin models were introduced some decades ago to mimic systems characterized by a glass transition. Recent developments have shown that a class of facilitated spin models is also able to reproduce characteristic signatures of the structural relaxation properties of glass-forming liquids. While the equilibrium phase diagram of these models can be calculated analytically, the dynamics are usually investigated numerically. Here we propose a new network-based approach, called approximate master equation (AME), to the dynamics of the Fredrickson-Andersen model. The approach correctly predicts the critical temperature at which the glass transition occurs. We also find excellent agreement between the theory and the numerical simulations for the transient regime, except in close proximity of the liquid-glass transition. Finally, we analytically characterize the critical clusters of the model and show that the departures between our AME approach and the Monte Carlo can be related to the large interface between frozen and unfrozen spins at temperatures close to the glass transition.

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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