摘要
The effective Lagrangian of a finite volume system should, in principle, depend on the system size. In the framework of the Nambu-Jona-Lasinio(NJL) model, by considering the influence of quark feedback on the effective coupling, we obtain a modified NJL model so that its Lagrangian depends on the volume. Based on the modified NJL model, we study the influence of finite volume on the chiral phase transition at finite temperature, and find that the pseudo-critical temperature of crossover is much lower than that obtained in the normal NJL model. This clearly shows that the volume dependent effective Lagrangian plays an important role in the chiral phase transitions at finite temperature.
The effective Lagrangian of a finite volume system should, in principle, depend on the system size. In the framework of the Nambu-Jona-Lasinio(NJL) model, by considering the influence of quark feedback on the effective coupling, we obtain a modified NJL model so that its Lagrangian depends on the volume. Based on the modified NJL model, we study the influence of finite volume on the chiral phase transition at finite temperature, and find that the pseudo-critical temperature of crossover is much lower than that obtained in the normal NJL model. This clearly shows that the volume dependent effective Lagrangian plays an important role in the chiral phase transitions at finite temperature.
作者
夏永辉
王庆武
冯红涛
宗红石
Yonghui Xia;Qingwu Wang;Hongtao Feng;Hongshi Zong(Department of physics,Nanjing University,Nanjing 210093,China;Department of physics,Sichuan University,Chengdu 610064,China;School of physics,Southeast University,Nanjing 210093,China;Joint Center for Particle,Nuclear Physics and Cosmology,Nanjing 210093,China)
基金
Supported by the National Natural Science Foundation of China(11475085,11535005,11690030)
the National Major state Basic Research and Development(2016YFE0129300)
