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arXiv 1003.3513cond-mat.stat-mechcond-mat.mes-hallmath-phmath.MP
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多尺度随机动力系统的不可逆热力学

Irreversible Thermodynamics in Multiscale Stochastic Dynamical Systems

Moises Santillan, Hong Qian

摘要:

这项工作扩展了最近开发的理论的一个相当完整的热力学形式主义的离散状态,连续时间马尔可夫过程和没有细致平衡的结果。本文旨在研究多尺度随机系统的热力学结构是否以及如何保持不变的问题。即在不同的时间尺度和分辨率下观察系统时,状态和过程变量的热力学函数之间的关系是否保持不变。我们的结果表明,在一个快的时间尺度上的动力学贡献的熵项的“内能函数”,$u_S(x)$,为缓慢的动力学。基于条件自由能$u_S(x)$,人们可以将慢动力学视为不存在快动力学。此外,我们表明,自由能,它的特点是自发组织在一个系统中没有细致平衡,是不变的快速动态或没有:快速动态被假定为达到平稳性瞬间在缓慢的时间尺度上,他们对系统的自由能没有影响。对于熵和内能,情况就不同了,它们都包含来自快速动力学的相同贡献。我们还调查的后果的时间尺度分离的准stationaryty和稳态绝热的概念引入唯象稳态热力学。

英文摘要:

This work extends the results of the recently developed theory of a rather complete thermodynamic formalism for discrete-state, continuous-time Markov processes with and without detailed balance. We aim at investigating the question that whether and how the thermodynamic structure is invariant in a multiscale stochastic system. That is, whether the relations between thermodynamic functions of state and process variables remain unchanged when the system is viewed at different time scales and resolutions. Our results show that the dynamics on a fast time scale contribute an entropic term to the "internal energy function", $u_S(x)$, for the slow dynamics. Based on the conditional free energy $u_S(x)$, one can then treat the slow dynamics as if the fast dynamics is nonexistent. Furthermore, we show that the free energy, which characterizes the spontaneous organization in a system without detailed balance, is invariant with or without the fast dynamics: The fast dynamics is assumed to reach stationarity instantaneously on the slow time scale; they have no effect on the system's free energy. The same can not be said for the entropy and the internal energy, both of which contain the same contribution from the fast dynamics. We also investigate the consequences of time-scale separation in connection to the concepts of quasi-stationaryty and steady-adiabaticity introduced in the phenomenological steady-state thermodynamics.

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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