RMF中有效相互作用对有限温度中子星性质的影响  

Influence of effective interactions in the RMF theory on properties of neutron star at finite temperature

作　　者：武新慧[1] 霍建立[2] 张华[2] 贾焕玉[3] 曾家刚[3] 

机构地区：[1]电子科技大学物理电子学院,成都610054 [2]四川大学物理科学与技术学院,成都610064 [3]西南交通大学现代物理研究所,成都610031

出　　处：《四川大学学报（自然科学版）》2008年第1期131-136,共6页Journal of Sichuan University(Natural Science Edition)

摘　　要：从相对论平均场(Relativistic Mean Field,RMF)理论出发,考虑核子、超子和介子的相互作用,研究了一定温度(T=20 MeV)下,各种不同相互作用参数组(DDME1、TW99、NL2、TM1、TM2、GL85和GL97)对中子星物质的粒子组成、状态方程和质量等的影响.发现在不同参数组下,相对论平均场对中子星性质和整体结构的描述有所不同.其中DDME1和TW99计算的结果基本相同,它们给出较强的介子场势、较小的超子转变密度、较硬的物态方程和较大的质量极限;而GL97、TM1和GL85给出较弱的介子场势、较软的物态方程以及比较小的极限质量.而NL2、TM2参数组所给出的结果则介于它们之间.The various effective interactions＇ （including DDME1, TW99, NL2, TM1, TM2, GL85 and GL97） influence on the constitute, equation of state and mass of neutron star are studied in the framework of relativistic mean field theory considering the interacting nucleons, hyperons and mesons system at finite temperature （T = 20 MeV）. It＇s found that the different effective interactions give us different descriptions of neutron star. The results of DDME1 and TW99 have little odds, they both give the stronger meson field potential, the smaller hyperon transition density, the harder equation of state and the bigger maximum mass; opposite to DDME1 and TW99, the GL97, TM1 and GL85 give the weaker meson field potential, the bigger hyperon transition density, the softer equation of state and the smaller maximum mass. And the results of NL2 and TM2 between the above two cases.

关 键 词：中子星 相对论平均场(RMF) 状态方程 

分 类 号：O572.2[理学—粒子物理与原子核物理]