The characteristic function for heat fluctuations in a non equilibrium system is characterised by a large deviation function whose symmetry gives rise to a fluctuation theorem. In equilibrium the large deviation function vanishes and the heat fluctuations are bounded. Here we consider the characteristic function for heat fluctuations in equilibrium, constituting a sub-leading correction to the large deviation behaviour. Modelling the system by an oscillator coupled to an explicit multi-oscillator heat reservoir we evaluate the characteristic function.

中文翻译：

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平衡热波动

非平衡系统中热涨落的特征函数的特点是一个大偏差函数，其对称性产生了涨落定理。在平衡状态下，大偏差函数消失，热波动是有界的。在这里，我们考虑平衡中热波动的特征函数，构成对大偏差行为的次引导校正。通过耦合到显式多振荡器储热器的振荡器对系统进行建模，我们评估了特征函数。