New Neutron Star Equation of State with Quark–Hadron Crossover

By G. Baym, S. Furusawa, T. Hatsuda, Toru Kojo, H. Togashi. Astrophysical Journal, 2019

172 citations recorded by the source corpus.

We present a much improved equation of state for neutron star matter, QHC19, with a smooth crossover from the hadronic regime at lower densities to the quark regime at higher densities. We now use the Togashi et al. equation of state, a generalization of the Akmal–Pandharipande–Ravenhall equation of state of uniform nuclear matter, in the entire hadronic regime; the Togashi equation of state consistently describes nonuniform as well as uniform matter, and matter at beta equilibrium without the need for an interpolation between pure neutron and symmetric nuclear matter. We describe the quark matter regime at higher densities with the Nambu–Jona–Lasinio model, now identifying tight constraints on the phenomenological universal vector repulsion between quarks and the pairing interaction between quarks arising from the requirements of thermodynamic stability and causal propagation of sound. The resultant neutron star properties agree very well with the inferences of the LIGO/Virgo collaboration, from GW170817, of the pressure versus baryon density, neutron star radii, and tidal deformabilities. The maximum neutron star mass allowed by QHC19 is 2.35 M⊙, consistent with all neutron star mass determinations.

Subfields: Astronomy and Astrophysics, Geophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e17d2cbb8d0b0b0a7ffdbdd73e2949017a39b630

Citations in the corpus

• Towards understanding astrophysical effects of nuclear symmetry energy (2019, unknown): “2.0 2.1 2.2 2.3 2.4 2.5 2.6 Baym et al. (2019) Shibata et al. (2019) Zhou et al. (2018) with pairing Zhou et al. (2018) Zhang & Li (2018) Shibata et al. (2018) Ruiz et al. (2018) Rezzolla et al. (2018) Margalit et al. (2017) Mmax [Msun] Fig.”