摘要
本文利用变分─累积展开方法将ＳＵ（２）×ＳＵ（２）格点手征模型的自由能展开到第五级，分别用主值法和聚点法（ａｃｃｕｍｕｌａｔｉｏｎｐｏｉｎｔ）确定变分参数，结果表明后者能得到与蒙特卡罗模拟更为一致的内能和比热曲线．
With the Variational-Cumulant Expansion method, the free energy of SU(2)×SU(2) lattice chiral model is calculated to the 5th order correction. The variational parameter is determined by main variational method and accumulation point method, respectively. It is showed that more correspondent internal energy curves and specific heat curves with the MC results can be obtained by the latter one.
出处
《高能物理与核物理》
CSCD
北大核心
1995年第3期245-250,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
国家教委博士点基金
关键词
手征模型
SU(2)×SU(2)
格点
variational-cumulant expansion
accumulation point
chiral model
phase structure.
