The Composition of Baryon in the Proto Neutron Star PSR J0348+0432

Abstract

The effect of the mesons f 0 (975)(named as f), ϕ(1020)(named as ϕ) and δ on the properties of the proto neutron star PSR J0348 + 0432 is studied in the framework of the relativistic mean field theory considering the baryon octet. We find the central particle number density will decrease considering the mesons δ but will increase as the mesons f, ϕ or mesons f, ϕ and δ all being considered. We also find that the mesons f, ϕ and δ have little effect on the field strengths of mesons σ and ω but have a greater influence on those of mesons ρ. For the chemical potential of neutrons, the influence of these mesons is relative small but for the chemical potential of electrons the meson effect is relatively large. It is also found that the relative particle number density of n will decrease while those of p and Σ − will increase considering the effect of the mesons δ, or f, ϕ, or f, ϕ and δ. The relative particle number density of Λ, Σ 0 , Σ + , Ξ − and Ξ 0 will decrease considering the effect of the mesons δ but will increase as the mesons f, ϕ or the mesons f, ϕ and δ all being considered.