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arXiv 0903.3122cond-mat.stat-mech
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粗化过程中的涨落和有效温度

Fluctuations and effective temperatures in coarsening

Federico Corberi, Leticia Cugliandolo

摘要:

我们研究了淬火到临界点和低温相的非无序有限维铁磁系统中的动力学涨落。本文研究了两个二次量$χ$和$C$的涨落,它们的平均值% $<χ>$,$<C>$产生自线性响应和关联函数。我们引入了一个限制平均的$χ$的,总结了所有的配置与一个给定的值$C$。我们发现,约束平均$<χ>_C$服从一个标度形式,并且对于$C\to 0$和长时间极限,标度函数的斜率都接近极限有效温度的普适值$X_\infty $.我们的结果倾向于确认的期望,时间重新参数化不变性是没有实现粗化系统在临界状态。最后,我们讨论了我们的建议可能的实验测试。

英文摘要:

We study dynamic fluctuations in non-disordered finite dimensional ferromagnetic systems quenched to the critical point and the low-temperature phase. We investigate the fluctuations of two two-time quantities, called $χ$ and $C$, the averages of which %$<χ>$, $<C>$ yield the self linear response and correlation function. We introduce a restricted average of the $χ$'s, summing over all configurations with a given value of $C$. We find that the restricted average $<χ>_C$ obeys a scaling form, and that the slope of the scaling function approaches the universal value $X_\infty $ of the limiting effective temperature in the long-time limit and for $C\to 0$. Our results tend to confirm the expectation that time-reparametrization invariance is not realized in coarsening systems at criticality. Finally, we discuss possible experimental tests of our proposal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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