Can the massive neutron star PSR J0348+0432 be a hyperon star?

TL;DR

This study investigates whether the massive neutron star PSR J0348+0432 can transform into a hyperon star using mean field theory, finding that such a transition is possible under various meson considerations.

Contribution

It demonstrates that PSR J0348+0432 can become a hyperon star regardless of meson inclusion, providing insights into neutron star composition and phase transitions.

Findings

PSR J0348+0432 can transition into a hyperon star with or without certain mesons.

The hyperon star transition density is unaffected by meson considerations.

Even canonical mass neutron stars can become hyperon stars at lower densities.

Abstract

Whether the massive neutron star PSR J0348+0432 can change into a hyperon star is studied in the framework of the relative mean field theory by choosing the suitable hyperon coupling constants. We find that whether the mesons $\sigma^{*}$ and $\phi$ being considered or not, the neutron star PSR J0348+0432 all can change into a hyperon star and the hyperon star transition density are the same for the two cases. We also find that the canonical mass neutron star also can change into a hyperon star in a minor hyperon star transition density as the mesons $\sigma^{*}$ and $\phi$ are not considered. Our results confirms some of recent conclusions.