自相互作用对超子星转变密度的影响

利用相对论平均场理论,考虑重子八重态｛n,p,Λ,Σ^-,Σ⁰,Σ⁺,Ξ^-,Ξ⁰｝, 研究了自相互作用对超子星转变密度的影响。研究发现:考虑到自相互作用的贡献,超子星的转变密度增大;超子Λ,Ξ^-,Σ^-和Ξ⁰出现时的重子数密度降低,而Σ⁰和Σ⁺超子出现时的重子数密度增加; 对于超子星转变密度,超子数密度贡献最大的是Λ和Ξ^-超子,占总超子数密度的80％以上;自相互作用的存在使得超子Ξ^-和Ξ⁰的贡献增大,而使Λ,Σ^-,Σ⁰和Σ⁺超子的贡献减小。

Effect of self-interactions on the transition density of hyperon stars

The effect of self interaction on the transition density of hyperon stars was examined in the framework of relativistic mean field theory for the baryon octet ｛n,p,Λ,Σ^-,Σ⁰,Σ⁺,Ξ^-,Ξ⁰｝system. It was found that the transition density of hyperon stars increased compared with those without considering the contribution of self-interaction. The critical baryon density increased when the hyperons Σ⁰ and Σ⁺ appeared, but it decreased when the Λ，Ξ^-，Σ^- and Ξ⁰ appeared. For the transition density of hyperon stars, the hyperons Λ and Ξ^- make a greater contribution to the hyperon number density, more than 80 percent. The presence of self-interaction makes the relative number density of Ξ^-  and Ξ0 increase but that of Λ，Σ^-，Σ⁰ and Σ⁺ decrease.