超子同位旋相互作用能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^-,Σ⁰,Σ⁺,Ξ^-,Ξ⁰}, 研究了超子同位旋相互作用对超子星转变密度的影响. 结果表明: 考虑超子同位旋相互作用, 当x_ρΣ分别取2,1,2/3时, 超子星的转变密度逐渐降低; 当重子数密度取为超子星转变密度时, Λ和Ξ^-超子对超子星转变密度贡献最大, 二者之和约占总超子数的80％;  Ξ^-超子的数量随x_ρΣ的减小而降低,  Λ超子的数量分别占总超子数的34.2％,35.8％和33.8％.

Effect of Hyperon Isospin Interaction on the Transition Density of Hyperon Stars

The effect of hyperon isospin interaction on the transition density of hyperon stars was studied by means of relativistic mean field theory for the baryon octet {n,p,Λ,Σ^-,Σ⁰,Σ⁺,Ξ^-,Ξ⁰} system. The results show that, considering the hyperon isospin interaction, the transition density of hyperon stars gradually decreased when x_ρΣ=2,1,2/3. When baryonic density was the transition density of hyperon stars, the Λ and Ξ^- hyperons make the most contribution to the transition density of hyperon stars, Λ and Ξ^- hyperon populations nearly amount to 80％ of the total hyperon populations, the particle populations of Ξ^- decreased as x_ρΣ reduced, Λ hyperon populations were 34.2％,35.8％ and 33.8％ of the total hyperon populations as x_ρΣ=2,1,2/3, respectively.