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arXiv 2008.10550cond-mat.stat-mechcond-mat.soft
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玻璃化转变的广义模耦合理论。II。解析标度律

Generalized mode-coupling theory of the glass transition. II. Analytical scaling laws

Chengjie Luo, Liesbeth M. C. Janssen

摘要:

广义模耦合理论(GMCT)是研究过冷液体动力学和玻璃化转变的第一性原理理论。它是一个分层的框架,通过纳入越来越多的粒子密度相关性,可以弥补一些固有的局限性的理想模式耦合理论(MCT)。然而,尽管MCT的局限性,理想的理论也享有一些显着的成功,特别是包括分析的比例定律的$α$ -和$β$ -松弛动力学。在这里,我们数学推导出类似的标度律的任意阶多点密度关联函数从GMCT任意平均场封闭水平下获得。更具体地说,我们解析地推导出多点密度衰减器的长时间极限的渐近解和前渐近解,具有两个幂律衰减的临界动力学,$β$ -松弛制度中的因子分解标度律,以及$α$ -松弛制度中的时间密度叠加原理。得到了两步衰变的两个特征幂律发散弛豫时间以及它们的指数之间的非平凡关系。通过引入前导前渐近修正,给出了前导阶标度律的有效范围。此外,我们测试这些解决方案的打击Yevick硬球系统。我们表明,GMCT保留所有著名的MCT标度律,同时定量提高指数,使理论最终定量的玻璃动力学第一原理理论的一个有前途的候选人。

英文摘要:

Generalized mode-coupling theory (GMCT) constitutes a systematically correctable, first-principles theory to study the dynamics of supercooled liquids and the glass transition. It is a hierarchical framework that, through the incorporation of increasingly many particle density correlations, can remedy some of the inherent limitations of the ideal mode-coupling theory (MCT). However, despite MCT's limitations, the ideal theory also enjoys several remarkable successes, notably including the analytical scaling laws for the $α$- and $β$-relaxation dynamics. Here we mathematically derive similar scaling laws for arbitrary-order multi-point density correlation functions obtained from GMCT under arbitrary mean-field closure levels. More specifically, we analytically derive the asymptotic and preasymptotic solutions for the long-time limits of multi-point density correlators, the critical dynamics with two power-law decays, the factorization scaling laws in the $β$-relaxation regime, and the time-density superposition principle in the $α$-relaxation regime. The two characteristic power-law-divergent relaxation times for the two-step decay and the non-trivial relation between their exponents are also obtained. The validity ranges of the leading-order scaling laws are also provided by considering the leading preasymptotic corrections. Furthermore, we test these solutions for the Percus-Yevick hard-sphere system. We demonstrate that GMCT preserves all the celebrated scaling laws of MCT while quantitatively improving the exponents, rendering the theory a promising candidate for an ultimately quantitative first-principles theory of glassy dynamics.

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