σ模型在有限温度和密度下的手征相变  

Chiral Phase Transition of σModel at a Finite Temperature and Density

作　　者：邓胜华[1] 

机构地区：[1]江汉石油学院基础课部

出　　处：《江汉石油学院学报》1991年第2期77-82,共6页Journal of Jianghan Petroleum Institute

摘　　要：从有限温度场论出发,算出了SU(2)×SU(2)线性σ模型在有限温度和密度下的单圈有效势;给出了手征相变的临界条件及序参量随温度和化学势的变化关系;探讨了σ模型手征相变的性质与有效势所反映的真空结构的关系。结果表明,σ模型描写的体系在有限温度和密度下既可发生一级相变,也可发生连续相变;相变性质与耦合常数存在分界点。The effective potential of SU(2)×SU(2)σ model at a finite temperature and density is calculated. It is shown that there exists a correspondent relation between the characteristics of the chiral-phase-transition and the vacuum structure reflected by effective potential. The dependence of the characteristics of that transition and that vacuum structure on the basic theoretical parameters is investigated.

关 键 词：σ模型 手征相变 温度 对称性 

分 类 号：O572.23[理学—粒子物理与原子核物理]