The coupled cluster method is improved with the random phase approximation (RPA) to calculate vacuum wave function and vacuum energy of 2 + 1-d SU (2) lattice gauge theory.
采用无规相近似(RPA)耦合集团展开方法，计算出2 + 1维su(2)格点规范场的三到六阶真空波函数和真空能量。
In particular, we have found that even at the mean field level the naive vacuum saturation approximation is not a good approximation when we consider nonlocal four quark condensate.
这里我们需特别指出的是在计算非定域的四夸克凝聚时以往经常采用的朴素的真空饱和假定不再是一个好的近似。
The squeezing of light in the system of two mode squeezed vacuum field interacting with a two level atom within and without the rotating wave approximation by means of quantum theory is studied.
研究了非旋波近似下双模压缩真空场与二能级原子相互作用系统中光子的统计性质，着重讨论了虚光场效应对光子统计性质的影响。
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