Effect of the mesons σ^* and Φ and the variety of U_Σ^(N) on the transition density of hyperon stars

Abstract: 

The effect of the mesons σ^* and Φ and the variety of U_Σ^(N) on the transition density of hyperon stars is examined within the framework of relativistic mean field theory for the baryon octet {n, p, Λ, Σ^－, Σ⁰, Σ⁺, Ξ^－ and Ξ⁰} system. It is found that, compared with that without considering the mesons σ^* and Φ, the transition density of hyperon stars decreases, the critical baryon density that hyperons Σ^－, Σ⁰, Σ⁺, Ξ^－ and Ξ⁰ appears to decrease too, but for Λ the effect is not obvious. As U_Σ^(N) goes up, the critical baryon density of Σ⁺, Σ⁰ and Σ^－ increases, that of Ξ⁰ decreases and that of Λ and Ξ^－ is fixed. In addition, it is found that the variety of U_Σ^(N) almost does not influence the transition density.