The properties of the massive neutron star PSR J0348+0432

Abstract

The properties of the massive neutron star PSR J0348+0432 is calculated in the framework of the relativistic mean field (RMF) theory by choosing the suitable hyperon coupling constants. It is found that the central energy density ϵc and the central pressure pc of the massive neutron star PSR J0348+0432 respectively are 1.5 times larger and 3.6 times larger than those of the canonical mass neutron star. It is also found that in the neutron star PSR J0348+0432 there are five kinds of baryons appearing: n, p, Λ, Ξ- and Ξ0 but in the canonical mass neutron star there are only three kinds of particles appearing: n, p and Λ. In our models, the positive well depth [Formula: see text] will restrict the production of the hyperons Σ-, Σ0 and Σ+ and therefore either in the neutron star PSR J0348+0432 or in the canonical mass neutron star the hyperons Σ-, Σ0 and Σ+ all do not appear. In addition, our results also show that the radius R of the massive neutron star PSR J0348+0432 is less than that of the canonical mass neutron star while the gravitational redshift of the former is larger than that of the latter.