Effect of hyperon coupling constants on the properties of the massive neutron star PSR J0348+0432

Abstract

The relativistic mean field (RMF) theory is used to examine the effect of the meson-[Formula: see text] coupling constants on the properties of the neutron star (NS) PSR J0348+0432 when the hyperon potential of [Formula: see text] is fixed. It is found that the greater the [Formula: see text] and [Formula: see text], the stronger the repulsive interaction. The potential field strengths of mesons [Formula: see text] and [Formula: see text] and the chemical potentials of neutron n and electron e increase, whereas the potential field strengths of mesons [Formula: see text] decrease with the increase of the meson-[Formula: see text] coupling constants. It is also found that the relative particle number density of neutron [Formula: see text] and hyperon [Formula: see text] in the NS PSR J0348+0432 increase, whereas that of hyperon [Formula: see text] decrease as the meson-[Formula: see text] coupling constants increase. In our calculations, hyperon [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] all do not appear. Our results show that the meson-[Formula: see text] coupling constants cannot be uniquely determined as the hyperon-potential of [Formula: see text] is determined. Therefore, the related properties of NS cannot be uniquely determined only by the determined hyperon potential of [Formula: see text].