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arXiv 0801.0014cond-mat.dis-nncond-mat.softcond-mat.stat-mech
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自旋玻璃模型中的时间重参数化对称性

Time reparametrization symmetry in spin glass models

Horacio E. Castillo

摘要:

通过对非平衡动力学生成泛函中的时间变量进行重整化群变换,研究了具有双自旋相互作用的自旋玻璃模型的长时间老化动力学.我们得到的RG方程,并发现流收敛到一个精确的不动点。我们证明了这个不动点在时间变量的重新参数化下是不变的。这种连续的对称性被打破,证明了一个事实,即观察到的相关性和响应不是不变的下it.We认为,这引起了存在的Goldstone模式,而这些Goldstone模式的形状的非平衡动力学的波动行为。

英文摘要:

We study the long-time aging dynamics of spin-glass models with two-spin interactions by performing a Renormalization Group transformation on the time variable in the non-equilibrium dynamical generating functional. We obtain the RG equations and find that the flow converges to an exact fixed point. We show that this fixed point is invariant under reparametrizations of the time variable. This continuous symmetry is broken, as evidenced by the fact that the observed correlations and responses are not invariant under it. We argue that this gives rise to the presence of Goldstone modes, and that those Goldstone modes shape the behavior of fluctuations in the nonequilibrium dynamics.

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