中文摘要：

研究有限温度密度下的FL模型,通过温度场论的标准方法,得到有限温度密度下的有效势.在FL模型中,重子内部亚稳态真空与外部物理真空有效势相等时退禁闭相变发生.据此在有限温度密度下进行计算,得到FL模型中的退禁闭相图.研究发现,该模型在强子相一直有稳定的孤子解,发生退禁闭相变后孤子解消失,孤子的变化与退禁闭相变的物理图像一致.

英文摘要：

The FL model is studied at finite temperature and density,the effective potential has beencalculated at different temperatures and densities by using the technique of the finite temperature field theory.Deconfinement phase transition takes place in FL model when the effective potentials inside and outside hadronare equal. The phase diagram of deconfinement is obtained by calculating critical points carefully.It turns outthat there are always stable soliton solutions in hadronic phase and soliton solutions vanish after deconfinementphase transition.The variation of solition is consistent with the deconfinement phase transition.