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arXiv 1109.0797cond-mat.stat-mech
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时均流累积量母函数的热力学公式

Thermodynamic formula for the cumulant generating function of time-averaged current

Takahiro Nemoto, Shin-ichi Sasa

摘要:

从运算的角度研究了时均电流的累积量母函数。具体地说,对于非平衡条件下的相互作用的布朗粒子,我们证明了累积量生成函数的一阶导数等于在一个修改后的系统与一个额外的力添加的电流的期望值,其中修改后的系统的特点是由一个变分原理。这个公式使我们想起了平衡态统计力学中爱因斯坦的涨落理论。此外,由于该公式导致的波动耗散关系时,线性响应区的重点,它被认为是线性响应理论的有效超出线性响应区的扩展。该公式也与先前已知的理论有关,如Donsker-Varadhan理论,可加性原理和最小耗散原理,但它不是从它们导出的。它的应用的例子提出了一个驱动的布朗粒子的环受周期性的潜力。

英文摘要:

The cumulant generating function of time-averaged current is studied from an operational viewpoint. Specifically, for interacting Brownian particles under non-equilibrium conditions, we show that the first derivative of the cumulant generating function is equal to the expectation value of the current in a modified system with an extra force added, where the modified system is characterized by a variational principle. The formula reminds us of Einstein's fluctuation theory in equilibrium statistical mechanics. Furthermore, since the formula leads to the fluctuation-dissipation relation when the linear response regime is focused on, it is regarded as an extension of the linear response theory to that valid beyond the linear response regime. The formula is also related to previously known theories such as the Donsker-Varadhan theory, the additivity principle, and the least dissipation principle, but it is not derived from them. Examples of its application are presented for a driven Brownian particle on a ring subject to a periodic potential.

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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