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arXiv 0809.3966cond-mat.stat-mech
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热传导模型中电流涨落可加性原理的检验

Test of the Additivity Principle for Current Fluctuations in a Model of Heat Conduction

Pablo I. Hurtado, Pedro L. Garrido

摘要:

可加性原理允许计算许多一维(1D)非平衡系统中的电流分布。使用模拟,我们证实了这一猜想在1D Kipnis-Marchioro-Presutti模型的热传导的宽电流间隔。电流分布表现出高斯和非高斯的制度,并遵守Gallavotti-Cohen波动定理。我们验证了存在一个定义良好的温度分布与一个给定的电流波动。这种配置文件是独立的电流的符号,这种对称性扩展到高阶配置文件和空间相关性。我们还表明,有限时间的联合波动的电流和配置文件所描述的可加性功能。这些结果表明,可加性假设作为一个通用的和强大的工具来计算电流分布在许多非平衡系统。

英文摘要:

The additivity principle allows to compute the current distribution in many one-dimensional (1D) nonequilibrium systems. Using simulations, we confirm this conjecture in the 1D Kipnis-Marchioro-Presutti model of heat conduction for a wide current interval. The current distribution shows both Gaussian and non-Gaussian regimes, and obeys the Gallavotti-Cohen fluctuation theorem. We verify the existence of a well-defined temperature profile associated to a given current fluctuation. This profile is independent of the sign of the current, and this symmetry extends to higher-order profiles and spatial correlations. We also show that finite-time joint fluctuations of the current and the profile are described by the additivity functional. These results suggest the additivity hypothesis as a general and powerful tool to compute current distributions in many nonequilibrium systems.

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