具有动力学破缺的模型在有限温度和密度下的手征相变  

CHIRAL PHASE TRANSITION IN A MODEL WITH DYNAMICAL SPONTANEOUS-SYMMETRYBREAKING AT FINITE TEMPERATURE AND DENSITY

作　　者：王恩科[1] 李家荣[1] 

机构地区：[1]华中师范大学粒子物理研究所

出　　处：《高能物理与核物理》1990年第11期980-990,共11页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金

摘　　要：作力一种定性的指导,本文用近似方法考察了具有动力学破缺的模型的手征对称性恢复相变.建立了模型的自洽方程;给出了费米子的凝聚和质量以及系统的能量密度和比热对温度和密度的依赖关系.结果表明在零化学势和有限温度情况,手征相变是二级相变,而在有限温度和密度及零温有限密度情况,手征相变是一级相变且从破缺相到正常相的转变温度或密度不同于从正常相到破缺相的转变温度或密度。The chiral-symmetry-restoring phase transition in a model with dynamical spontaneoussymmetry-breaking is discussed qualitatively, making use of an approximation method. The selfconsistency equation of the model is established. The condensation and mass of fermions as well as the temperature or density dependence of energy density and specific heat are obtained. It turns out that, in this approximation, the chiral-phase-transition is second order at zero chemical potential and finite temperature; and the transition is first order for both cases at finite temperature and density and at zero temperature and finite density, this moment, the transition temperature or density from broken phase to normal phase differs from that from normal phase to broken phase.

关 键 词：动力学破缺 模型 手征对称性 相变 

分 类 号：O572.243[理学—粒子物理与原子核物理]