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arXiv 1602.03004cond-mat.stat-mech
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玻璃化转变的标度性和普适性

Scaling and universality in glass transition

Antonio de Candia, Annalisa Fierro, Antonio Coniglio

摘要:

动力学促进模型和模式耦合理论(MCT)模型B是在这些系统中已知的表现出一个不连续的动力学过渡与两步松弛。在平均场论中,我们通过考虑密度相关器<q(t)>和动力学磁化率<q^2(t)> -<q(t)>^2的行为,考虑了这类系统的一般标度方法。聚焦于Bethe晶格上的Fredrickson和Andersen(FA)促进的自旋模型,我们扩展了Arenzon等人先前为连续玻璃化转变开发的簇方法(Phys. Rev. E 90,020301(R)(2014))来描述衰减到平台,并考虑损伤扩散机制来描述离开平台。我们预测的标度律,这涉及到动态指数的平均场自举渗流的静态指数。密度相关系数和动力学磁化率的动力学行为和标度律与MCT的预测结果一致。这些结果解释了标度律的起源和平均场中玻璃化转变的普遍行为,即临界维数d_c=8的自举渗流模型的静态长度的发散.

英文摘要:

Kinetic facilitated models and the Mode Coupling Theory (MCT) model B are within those systems known to exhibit a discontinuous dynamical transition with a two step relaxation. We consider a general scaling approach, within mean field theory, for such systems by considering the behavior of the density correlator <q(t)> and the dynamical susceptibility <q^2(t)> -<q(t)>^2. Focusing on the Fredrickson and Andersen (FA) facilitated spin model on the Bethe lattice, we extend a cluster approach that was previously developed for continuous glass transitions by Arenzon et al (Phys. Rev. E 90, 020301(R) (2014)) to describe the decay to the plateau, and consider a damage spreading mechanism to describe the departure from the plateau. We predict scaling laws, which relate dynamical exponents to the static exponents of mean field bootstrap percolation. The dynamical behavior and the scaling laws for both density correlator and dynamical susceptibility coincide with those predicted by MCT. These results explain the origin of scaling laws and the universal behavior associated with the glass transition in mean field, which is characterized by the divergence of the static length of the bootstrap percolation model with an upper critical dimension d_c=8.

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