摘要
采用相对论平均场理论(RMFT)下的GL85,GL92,TM1和TM2等核物质参数组,研究了这些参数组对中子星的粒子数密度分布、状态方程及质量-半径关系的影响.结果表明,在不同的参数组下,超子出现的密度、顺序和种类均不同;状态方程的软硬情况也较大不同;中子星的引力质量和相应的半径有明显不同.计算结果也表明,采用GL85,TM1和TM2等参数组得到的中子星质量和半径均在脉冲星的观测数据范围内,而采用GL92参数组得到的中子星质量小于中子星质量下限1.4M⊙(M⊙=1.99×1030kg为太阳质量).
Model dependence of neutron star properties is studied,making use of the parameter sets GL85,GL92,TM1 and TM2 in the framework of relativistic mean field theory（RMFT）.Numerical results indicate that the onset density of hyperons,the order and number for the appearance of hyperon species as well as the equations of state and mass-radius relations for the star are distinctly different when different parameter sets are used to describe the nuclear matter.It is also indicated that the gravitational mass and the corresponding radius of neutron stars calculated with the parameter sets GL85,TM1 and TM2 are in the scope of observation value for pulsars,while the gravitational mass of neutron stars calculated with the parameter set GL92 is smaller than the lower limit of neutron star mass,1.4 M⊙（M⊙=1.99×1030 kg refers to the solar mass）.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第11期76-80,共5页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金资助项目(10275029)
河南省自然科学基金资助项目(1123004101870)
河南省教育厅自然科学研究计划资助项目(2008A140009)
关键词
相对论平均场理论
核物质参数组
状态方程
质量-半径关系
relativistic mean field theory
nuclear matter parameter set
equations of state
mass-radius relation
