【摘要】 在计算有限温度ＳＵ（２）格点规范模型Ｐｏｌｙａｋｏｖ线的过程中，考虑到变分 累积展开法中有限距离相互作用效应与 Ｍｏｎｔｅ Ｃａｒｌｏ中的有限体积效应的相似 性，采用了新的方法来确定相变点．与已有的方法以及 Ｍｏｎｔｅ Ｃａｒｌｏ模拟给出的 结果比较，新方法给出的结果更接近 Ｍｏｎｔｅ Ｃａｒｌｏ结果．更多还原

【Abstract】 Based on Variational-cumulant expansion (VCE), through calculating Polyakov line in the SU(2) gauge model at finite temperature and considering the similarity of finite size interaction in VCE method with the finite volume effect in Monte Carlo (MC) simulation, a new approach is adopted to determine the critical couplings for the deconfinement phase transition. New results of VCE which are close to MC data manifest that new approach is much more effective than the traditional one and show that VCE analysis is consistent with MC simulation.更多还原