自相互作用对超子星转变密度的影响

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

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。

The effect of self-interaction on the transition density of hyperon stars was examined in the framework of the relativistic mean field theory for the baryon octet {n,P,∧,∑-,∑0,∑＋,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 ∑0 and ∑＋ appeared, but it decreased when the∧,Ξ-,∑- and Ξ0 appeared. For the transition density of hyperon stars, the hyperons ∧ 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 ∧,∑-,∑0and ∑＋ decrease.