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arXiv 0903.3571cond-mat.stat-mechnlin.CD
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反常动力学的涨落关系

Fluctuation relations for anomalous dynamics

A. V. Chechkin, R. Klages

摘要:

我们认为工作波动关系(FR)的一般类型的动力学产生异常扩散:利维飞行,长相关高斯过程和时间分数动力学。通过结合朗之万和动力学的方法,我们计算的概率分布的机械和化学工作在两个典型的非平衡的情况下,分别是:一个粒子受到一个恒定的力和一个粒子在一个恒定的力拖动的谐波电位。我们检查的瞬态FR表现出超扩散的两个模型,其中波动耗散关系不存在,并为其他两个模型显示subdiffusion,其中有一个波动耗散关系。在前两种情况下,传统的瞬态FR没有恢复,而在后两种情况下,它持有无论是确切的或在长时间的限制。

英文摘要:

We consider work fluctuation relations (FRs) for generic types of dynamics generating anomalous diffusion: Levy flights, long-correlated Gaussian processes and time-fractional kinetics. By combining Langevin and kinetic approaches we calculate the probability distributions of mechanical and thermodynamical work in two paradigmatic nonequilibrium situations, respectively: a particle subject to a constant force and a particle in a harmonic potential dragged by a constant force. We check the transient FR for two models exhibiting superdiffusion, where a fluctuation-dissipation relation does not exist, and for two other models displaying subdiffusion, where there is a fluctuation-dissipation relation. In the two former cases the conventional transient FR is not recovered, whereas in the latter two it holds either exactly or in the long-time limit.

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