有限温度和有限密度下的汤川势

Yukawa Potential at Finite Temperature and Finite Density

利用实时格林函数方法,本文推广汤川势至有限温度和有限密度情况.我们发现,σ介子的有效质量随温度和/或密度升高而减小.本文还对由实时格林函数给出的结果和由虚时格林函数给出的结果进行了比较.

By means of the real time Green's function method, the yukawa potential is extended to finite temperature and finite density. It is found that the effective mass of sigma meson will decrease as the temperature and/or density increase. The results given by the real time Green's function method and the imaginary time Green's function method are compared.