arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1206.4067cond-mat.stat-mechcond-mat.dis-nn
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玻璃态动力学中的准平衡:一个代数观点

Quasi-equilibrium in glassy dynamics: an algebraic view

Silvio Franz, Giorgio Parisi

摘要:

我们研究了一个链的相同的玻璃体系在约束平衡,其中链的每个键被迫保持在一个预先指定的距离,以前一个。我们将这种描述应用于长链极限下的平均场玻璃体系,其中每个键都与前一个键接近。我们表明,在特定的条件下,这个伪动力学过程可以形式上描述真正的弛豫动力学的长时间。特别地,在平均场自旋玻璃模型中,我们可以用这种方法恢复在动力学转变温度及以下的长时间极限内的朗之万动力学方程。我们解释的正式身份的证据表明,在这些情况下,配置空间探索在一个准平衡的方式。我们的一般形式主义,将动态平衡,把缓慢的动力学在一个新的角度来看,并开辟了道路,在玻璃系统中的新的动力学量的计算。

英文摘要:

We study a chain of identical glassy systems in a constrained equilibrium where each bond of the chain is forced to remain at a preassigned distance to the previous one. We apply this description to Mean Field Glassy systems in the limit of long chain where each bond is close to the previous one. We show that in specific conditions this pseudo-dynamic process can formally describe real relaxational dynamics the long time. In particular, in mean field spin glass models we can recover in this way the equations of Langevin dynamics in the long time limit at the dynamical transition temperature and below. We interpret the formal identity as an evidence that in these situations the configuration space is explored in a quasi-equilibrium fashion. Our general formalism, that relates dynamics to equilibrium puts slow dynamics in a new perspective and opens the way to the computation of new dynamical quantities in glassy systems.

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