Year: 2016
Type: article
Abstract: We analyze the stellar properties of the relativistic mean-field (RMF) parametrizations shown to be consistent with the recently studied constraints related to nuclear matter, pure neutron matter, symmetry energy, and its derivatives [Phys. Rev. C 90, 055203 (2014)]. Our results show that only two RMF parametrizations do not allow the emergence of the direct Urca process, important aspect regarding the evolution of a neutron star. Moreover, among all approved RMF models, fourteen of them produce neutron stars with maximum masses inside the range $1.93\ensuremath{\le}M/{M}_{\ensuremath{\bigodot}}\ensuremath{\le}2.05$, with ${M}_{\ensuremath{\bigodot}}$ being the solar mass. Only three models yield maximum masses above this range and a discussion on the inclusion of hyperons is presented. Finally, we verified that the models satisfying the neutron star maximum mass constraint do not observe the squared sound velocity bound; namely, ${v}_{s}^{2}<1/3$, corroborating recent findings. However, the recently proposed $\ensuremath{\sigma}$-cut scheme can make the RMF models consistent with both constraints, depending on the isoscalar-vector interaction of each parametrization.
Source: Physical Review C
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2257969343