关键词: 中子星;超子星;转变密度;相对论平均场理论

Abstract:

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.

Key words: neutron star; hyperon star; transition density; relativistic mean field theory