arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.05118cond-mat.dis-nncond-mat.stat-mech
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动态平均场论与老化动力学

Dynamical Mean-Field Theory and Aging Dynamics

Ada Altieri, Giulio Biroli, Chiara Cammarota

摘要:

动力学平均场论(DMFT)将多体动力学问题转化为单自由度的热浴动力学问题,热浴的特征是自洽确定的。通过专注于软无序$p$ -自旋相互作用的模型,我们展示了如何将平均场论的动态平均场论老化。我们研究的情况下,只有一个慢的时间尺度,静态对应的一步复本对称性破缺(1 RSB)阶段,和情况下,有无限多个慢的时间尺度,静态对应的完整的复本对称性破缺(FRSB)阶段。对于前者,我们表明,通过要求短时间尺度上的临界动力学行为,即边际性,慢自由度的有效温度是固定的。对于后者,我们发现,在一个无限数量的慢时间尺度上的老化是由一个随机方程,其中的时钟动态演化是固定的有效温度的变化,从而获得的FRSB相位的基础上的随机方程的动力学推导。我们的研究结果扩展了平均场论的领域,所有的情况下,DMFT持有的老化。

英文摘要:

Dynamical Mean-Field Theory (DMFT) replaces the many-body dynamical problem with one for a single degree of freedom in a thermal bath whose features are determined self-consistently. By focusing on models with soft disordered $p$-spin interactions, we show how to incorporate the mean-field theory of aging within dynamical mean-field theory. We study cases with only one slow time-scale, corresponding statically to the one-step replica symmetry breaking (1RSB) phase, and cases with an infinite number of slow time-scales, corresponding statically to the full replica symmetry breaking (FRSB) phase. For the former, we show that the effective temperature of the slow degrees of freedom is fixed by requiring critical dynamical behavior on short time-scales, i.e. marginality. For the latter, we find that aging on an infinite number of slow time-scales is governed by a stochastic equation where the clock for dynamical evolution is fixed by the change of effective temperature, hence obtaining a dynamical derivation of the stochastic equation at the basis of the FRSB phase. Our results extend the realm of the mean-field theory of aging to all situations where DMFT holds.

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