Abstract:

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.

Key words: neutron stars, hyperon stars, transition density, relativistic mean field theory