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arXiv 0812.0740cond-mat.softcond-mat.dis-nn
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非平衡胶体中的广义涨落耗散关系和有效温度

Generalized fluctuation-dissipation relation and effective temperature in off-equilibrium colloids

Claudio Maggi, Roberto Di Leonardo, Jeppe C. Dyre, Giancarlo Ruocco

摘要:

涨落-耗散关系(FDR)是平衡态统计物理学的一个基本结果,当系统脱离平衡态时,它就不再有效。对于非平衡系统,理论上提出了FDR的一种推广:用与时间尺度相关的有效温度代替进入FDR的动力学温度。我们结合的关联函数的胶体粒子的旋转动力学的测量,通过动态光散射与双折射响应的研究广义FDR在一个非平衡粘土悬浮液经历老化。我们发现FDR在老化过程的早期阶段被强烈违反,并随着老化时间的增加而逐渐恢复,ii)我们确定了有效温度的老化时间演化,支持所提出的推广方案。

英文摘要:

The fluctuation-dissipation relation (FDR), a fundamental result of equilibrium statistical physics, ceases to be valid when a system is taken out of the equilibrium. A generalization of FDR has been theoretically proposed for out-of-equilibrium systems: the kinetic temperature entering FDR is substituted by a time-scale dependent effective temperature. We combine the measurements of the correlation function of the rotational dynamics of colloidal particles obtained via dynamic light scattering with those of the birefringence response to study the generalized FDR in an off-equilibrium clay suspension undergoing aging. We i) find that FDR is strongly violated in the early stage of the aging process and is gradually recovered as the aging time increases and, ii), we determine the aging time evolution of the effective temperature, giving support to the proposed generalization scheme.

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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