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

Abstract：

The effect of the mesons σ^*and Φ and the variety ofU_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 Ξ⁰appears to decrease too, but for Λ the effect is not obvious. AsU_Σ^(N)goes up, the critical baryon density of Σ⁺, Σ⁰and Σ^－increases, that of Ξ⁰decreases and that of Λ and Ξ^－is fixed. In addition, it is found that the variety ofU_Σ^(N)almost does not influence the transition density.