随机碰撞动力学中电流的大偏差
Large deviations of the current in stochastic collisional dynamics
摘要:
我们考虑一类确定性的局部碰撞动力学,展示如何近似它们的随机模型,然后研究能量流的波动。我们首先证明了时间积分电流的方差是有限的,并与电导率的格林-久保关系。接下来,我们表明,法律的经验平均电流满足一个大偏差原则,并明确计算率功能在一个合适的标度限制。我们观察到,这个功能不是严格凸的。
英文摘要:
We consider a class of deterministic local collisional dynamics, showing how to approximate them by means of stochastic models and then studying the fluctuations of the current of energy. We show first that the variance of the time-integrated current is finite and related to the conductivity by the Green-Kubo relation. Next we show that the law of the empirical average current satisfies a large deviations principle and compute explicitly the rate functional in a suitable scaling limit. We observe that this functional is not strictly convex.
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