∑超子在饱和核物质中的势深度与前身中子星转动惯量  

Potential Depth of∑in Nuclear Matter and Moment of Inertia of a Proto Neutron Star

作　　者：赵先锋[1] 

机构地区：[1]滁州学院电子信息工程系,滁州239000

出　　处：《天文学报》2011年第2期126-135,共10页Acta Astronomica Sinica

基　　金：安徽省高校省级自然科学研究项目(KJ2009B106);滁州学院博士科研启动基金资助

摘　　要：利用相对论平均场理论并考虑重子八重态{n,p,Λ,Σ^-,Σ~0,Σ^+,Ξ^-,Ξ~0},计算研究了Σ超子在饱和核物质中的势深度U_Σ^((N))对前身中子星(PNS)转动惯量的影响.研究发现:当U_Σ^((N))依次取吸引势-30 MeV、-20 MeV、-10 MeV和0 MeV时,前身中子星相应于最大质量的转动惯量分别增大0.44%、0.29%和0.08%;当U_Σ^((N))依次取排斥势+10 MeV、+20 MeV和+30MeV时,前身中子星相应于最大质量的转动惯量分别增大0.06%和0.10%.取吸引势时的U_Σ^((N))对相应于最大质量的转动惯量的影响较之取排斥势时的U_Σ^((N))对它的影响大数倍.Within the framework of relativistic mean field theory for the baryon octet system {n,P,A,∑-,∑0,∑＋,∑-,∑0}, the influence of the potential depth U∑（N） of ∑ in nuclear matter on the moment of inertia of a proto neutron star is investigated. It is found that the effect of the attractive potential depth U∑（N） on the maximum mass of a proto neutron star is more than several dozen times larger than that of the repulsive one, and the effect of the attractive potential depth U∑（N） on the radius corresponding to the maximum mass is larger than that of the repulsive one. It is also found that the moment of inertia corresponding to the maximum mass increases, respectively, by 0.44%, 0.29% and 0.08% for u（N）=-30 MeV, -20 MeV, -10 MeV and 0 MeV, and increases by 0.06% and 0.10% for u（N）=＋10 MeV,＋20 MeV and ＋30 MeV. The effect of negative U（N） on the moment of inertia corresponding to the maximum mass is several times larger than that of positive one.

关 键 词：恒星 前身星 恒星 演化 恒星 中子 

分 类 号：P145[天文地球—天体物理]