变分累积展开方法中确定相变点的新方法  

A New Approach about Determining the Phase Transition Point in Variational-Cumulant Expansion

作　　者：卢强[1] 李红[1] 陈天仑[1] 

机构地区：[1]南开大学物理系,天津300071

出　　处：《高能物理与核物理》2001年第2期95-100,共6页High Energy Physics and Nuclear Physics

基　　金：国家科学基金的资助!(19775024)

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．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.

关 键 词：格点规范理论 退禁闭相变 变分累积展开 相变点 

分 类 号：O571[理学—粒子物理与原子核物理]