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arXiv 1301.3702cond-mat.stat-mech
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粒子非守恒过程中的粒子流涨落

Particle current fluctuations in a particle-nonconserving process

Pegah Torkaman, Farhad H. Jafarpour

摘要:

我们考虑了具有反射边界的有限格点上经典粒子的一维凝聚-解凝聚系统。已知该系统经历从高密度相到低密度相的相变。利用矩阵乘积方法,我们得到了热力学极限下系统平均熵产生率的精确表达式。我们还对熵产生率和粒子流的涨落进行了大偏差分析。结果表明,大偏差函数中的扭结特征可以用来发现相变点。我们发现,对于很弱的驱动场(当系统接近平衡态时)和很强的驱动场(当系统处于低密度相时),熵产生率涨落的大偏差函数近似为抛物线,而在高密度相,它明显偏离高斯行为。验证了粒子流大偏差函数的Gallavotti-Cohen涨落关系的正确性。

英文摘要:

We have considered a one-dimensional coagulation-decoagulation system of classical particles on a finite lattice with reflecting boundaries. It is known that the system undergoes a phase transition from a high-density to a low-density phase. Using a matrix product approach we have obtained an exact expression for the average entropy production rate of the system in the thermodynamic limit. We have also performed a large deviation analysis for fluctuations of entropy production rate and particle current. It turns out that the characteristics of the kink in the large deviation function can be used to spot the phase transition point. We have found that for very weak driving field (when the system approaches to its equilibrium) and also for very strong driving field (when the system is in the low-density phase) the large deviation function for fluctuations of entropy production rate is almost parabolic while in the high-density phase it prominently deviates from Gaussian behavior. The validity of the Gallavotti-Cohen fluctuation relation for the large deviation function for particle current is also verified.

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