摘要翻译：
巨正则系综和正则系综在热力学极限下是等价的，但当系统尺寸有限时，这两个系综所得到的结果却相互偏离。在许多重要的情况下，正则系综提供了适当的物理描述，但在相应的巨正则系综中进行计算往往容易得多。提出了一种基于巨正则系综期望值计算正则系综平均值的方法。粒子数，在正则系综中是固定的，并不一定与巨正则系综中的平均粒子数相同。
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英文标题：
《Calculations of canonical averages from the grand canonical ensemble》
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作者：
D. S. Kosov, M. F. Gelin and A.I. Vdovin
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最新提交年份：
2008
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分类信息：

一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
  Grand canonical and canonical ensembles become equivalent in the thermodynamic limit, but when the system size is finite the results obtained in the two ensembles deviate from each other. In many important cases, the canonical ensemble provides an appropriate physical description but it is often much easier to perform the calculations in the corresponding grand canonical ensemble. We present a method to compute averages in canonical ensemble based on calculations of the expectation values in grand canonical ensemble. The number of particles, which is fixed in the canonical ensemble, is not necessarily the same as the average number of particles in the grand canonical ensemble.
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PDF链接：
https://arxiv.org/pdf/707.1357