Expanding the thermodynamical potential and analysis of the possible phase diagram of deconfinement in the FL model  

作　　者：舒崧 李家荣 

机构地区：[1]Faculty of Physics and Electronic Technology, Hubei University [2]Institute of Particle Physics, Huazhong Normal University

出　　处：《Chinese Physics C》2012年第4期316-321,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10905018,10875050)

摘　　要：Deconfinement phase transition is studied in the FL model at finite temperature and chemical potential. At MFT approximation, phase transition can only be first order in the whole μ-T phase plane. Using a Landau expansion, we further study the phase transition order and the possible phase diagram of deconfinement. We discuss the possibilities of second order phase transitions in the FL model. From our analysis, if the cubic term in the Landau expansion could be cancelled by the higher order fluctuations, second order phase transition may occur. By an ansatz of the Landau parameters, we obtain a possible phase diagram with both the first and second order phase transitions, including the tri-critical point which is similar to that of the chiral phase transition.Deconfinement phase transition is studied in the FL model at finite temperature and chemical potential. At MFT approximation, phase transition can only be first order in the whole μ-T phase plane. Using a Landau expansion, we further study the phase transition order and the possible phase diagram of deconfinement. We discuss the possibilities of second order phase transitions in the FL model. From our analysis, if the cubic term in the Landau expansion could be cancelled by the higher order fluctuations, second order phase transition may occur. By an ansatz of the Landau parameters, we obtain a possible phase diagram with both the first and second order phase transitions, including the tri-critical point which is similar to that of the chiral phase transition.

关 键 词：deconfinement phase transition soliton model finite-temperature field theory 

分 类 号：O642[理学—物理化学]