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arXiv 1003.2585cond-mat.stat-mech
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涨落耗散温度可观测性的熵表征

Entropy-based characterizations of the observable-dependence of the fluctuation-dissipation temperature

Kirsten Martens, Eric Bertin, Michel Droz

摘要:

通过广义涨落-耗散关系定义非平衡温度依赖于涨落-耗散温度与所考虑的可观测值的独立性。我们认为,这种可观察到的独立性是深相关的相空间概率分布的均匀性的超曲面的恒定能量。这一属性明确显示在三个不同的随机模型,其中可观察的波动耗散温度的依赖性只出现时,相空间分布的均匀性被打破。第一个模型是环上的能量输运模型,具有有偏的局部输运规则。在第二个模型中,定义在一个完全连接的几何形状,能量交换与两个热浴在不同的温度,打破了相空间分布的均匀性。最后,在最后一个模型中,系统连接到一个零温度的水库,并保持相空间分布的均匀性在松弛制度,导致一个可观察的独立的温度。

英文摘要:

The definition of a nonequilibrium temperature through generalized fluctuation-dissipation relations relies on the independence of the fluctuation-dissipation temperature from the observable considered. We argue that this observable independence is deeply related to the uniformity of the phase-space probability distribution on the hypersurfaces of constant energy. This property is shown explicitly on three different stochastic models, where observable-dependence of the fluctuation-dissipation temperature arises only when the uniformity of the phase-space distribution is broken. The first model is an energy transport model on a ring, with biased local transfer rules. In the second model, defined on a fully connected geometry, energy is exchanged with two heat baths at different temperatures, breaking the uniformity of the phase-space distribution. Finally, in the last model, the system is connected to a zero temperature reservoir, and preserves the uniformity of the phase-space distribution in the relaxation regime, leading to an observable-independent temperature.

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