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arXiv 1301.4281cond-mat.stat-mech
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均匀剪切欠阻尼系统的非平衡模态耦合理论

Nonequilibrium mode-coupling theory for uniformly sheared underdamped systems

Koshiro Suzuki, Hisao Hayakawa

摘要:

提出了等温条件下均匀剪切欠阻尼系统的模态耦合理论。作为等温条件的结果,它示出的剪切应力表现出显着的松弛在α-松弛制度由于冷却效果,这是伴随着电流波动的增长。这表明,非平衡欠阻尼MCT是不等于相应的过阻尼MCT,即使在长时间尺度后的早期阶段的β松弛。然而,在剪切恒温欠阻尼系统中,关联对密度电流模的影响可以忽略不计。

英文摘要:

Mode-coupling theory for uniformly sheared underdamped systems with an isothermal condition is presented. As a result of the isothermal condition, it is shown that the shear stress exhibits significant relaxation at the alpha-relaxation regime due to the cooling effect which is accompanied by the growth of the current fluctuation. This indicates that nonequilibrium underdamped MCT is not equivalent to the corresponding overdamped MCT, even at long time-scales after the early stage of the beta relaxation. It is verified that the effect of correlations to the density-current modes is, however, negligible in sheared thermostated underdamped systems.

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