Stochastic processes originating in deterministic microscopic dynamics

Stochastic processes originating in deterministic microscopic dynamics
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起源于确定性微观动力学的随机过程

DOI:
10.1007/bf01012325
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发表时间:
1983
影响因子:
1.6
通讯作者:
J. Lebowitz
J. Lebowitz
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
D. Dürr;S. Goldstein;J. Lebowitz

文献摘要

被引文献

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我们根据经典力学定律研究了平衡流体中移动的测试粒子的缩放轨迹的概率分布,即,如果 Q(t) 是测试粒子的位移,我们令 QA(t) =Q(At)/√A 并考虑轨迹 QA(t) 在极限 A→∞ 中的分布。运动的随机性完全是由于流体、测试粒子或两者的初始状态的随机性,并且该过程通常是非马尔可夫的。尽管如此,在某些情况下它可以被证明,并且我们期望在更多情况下 QA (t) 看起来像极限 A→∞ 下的布朗运动。给出了简单模型系统的一些结果。
We investigate the probability distribution of the scaled trajectory of a test particle moving in an equilibrium fluid according to the laws of classical mechanics, i.e., ifQ(t) is the displacement of the test particle we letQA(t) =Q(At)/√A and consider the distribution of the trajectory QA(t) in the limit A→∞. The randomness of the motion is due entirely to the randomness of the initial state of the fluid, test particle, or both, and the process is generally non-Markovian. Nevertheless, it can be proven in some cases and we expect it to be true in many more that QA (t) looks like Brownian motion in the limit A→∞. Some results for simple model systems are presented.