Superstatistics

Superstatistics
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DOI:
10.1016/s0378-4371(03)00019-0
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发表时间:
2003-05-01
影响因子:
3.3
通讯作者:
Cohen, EGD
Cohen, EGD
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Beck, C;Cohen, EGD

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我们考虑在长时间尺度上具有强量(例如温度、化学势或能量耗散)的大波动的定态复杂动力学非平衡系统。根据涨落的统计性质,我们得到不同的有效统计力学描述。Tsallis统计量来自于一个密集变量的χ(2)分布,但也得到了其他类别的广义统计量。我们表明,对于小方差的波动,所有这些不同的统计表现在一个普遍的方式。(C)2003 Elsevier Science B.V.保留所有权利。
We consider nonequilibrium systems with complex dynamics in stationary states with large fluctuations of intensive quantities (e.g. the temperature, chemical potential or energy dissipation) on long time scales. Depending on the statistical properties of the fluctuations, we obtain different effective statistical mechanical descriptions. Tsallis statistics follows from a chi(2)-distribution of an intensive variable, but other classes of generalized statistics are obtained as well. We show that for small variance of the fluctuations all these different statistics behave in a universal way. (C) 2003 Elsevier Science B.V. All rights reserved.