Structure of hybrid protoneutron stars within the Nambu--Jona-Lasinio model

TL;DR

This paper models the internal structure of hybrid protoneutron stars using realistic hadronic and quark matter equations of state, finding maximum masses around 1.8 solar masses and no metastable hybrid configurations.

Contribution

It combines a finite temperature hadronic EOS with the Nambu--Jona-Lasinio quark model to analyze protoneutron star structure, providing new insights into their maximum mass and stability.

Findings

Maximum mass around 1.8 solar masses

No metastable hybrid protoneutron stars found

Slight temperature dependence on maximum mass

Abstract

We investigate the structure of protoneutron stars (PNS) formed by hadronic and quark matter in $\beta$-equilibrium described by appropriate equations of state (EOS). For the hadronic matter, we use a finite temperature EOS based on the Brueckner-Bethe-Goldstone many-body theory, with realistic two- and three-body forces. For the quark sector, we employ the Nambu--Jona-Lasinio model. We find that the maximum allowed masses are comprised in a narrow range around 1.8 solar masses, with a slight dependence on the temperature. Metastable hybrid protoneutron stars are not found.