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arXiv · 1712.08860

The properties of the neutron star PSR J0348+0432

Xian-Feng Zhao
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Abstract

The properties of the massive neutron star PSR J0348+0432 is calculated in the framework of the relativistic mean field theory by choosing the suitable hyperon coupling constants. It is found that the central energy density $ε_{c}$ and the central pressure $p_{c}$ 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 $Ξ^{0}$ 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 $U_Σ^{(N)}$ will restrict the production of the hyperons $Σ^{-}$, $Σ^{0}$ and $Σ^{+}$ and therefore either in the neutron star PSR J0348+0432 or in the canonical mass neutron star the hyperons $Σ^{-}$, $Σ^{0}$ 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.

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Xian-Feng Zhao. 2017-12-23. The properties of the neutron star PSR J0348+0432. https://doi.org/10.1142/s0218271815500583

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