Massive neutron stars with a color superconducting quark matter core

Tanimoto, Takehiro; Bentz, Wolfgang; Cloët, Ian C.

doi:10.1103/physrevc.101.055204

Massive neutron stars with a color superconducting quark matter core

Journal Article · Tue May 19 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.101.055204· OSTI ID:1763708

Tanimoto, Takehiro ^[1]; ^[1]; Cloët, Ian C. ^[2]

Tokai Univ., Kanagawa (Japan)
Argonne National Lab. (ANL), Argonne, IL (United States)

In this work, we construct the equation of state for high-density neutron star matter at zero temperature using the two-flavor Nambu–Jona-Lasinio (NJL) model as an effective theory of QCD. We build nuclear matter, quark matter, and the mixed phases from the same NJL Lagrangian, which has been used to model free and in-medium hadrons as well as nuclear systems. A focus here is to determine if the same coupling constants in the scalar diquark and vector meson channels, which give a good description of nucleon structure and nuclear matter, can also be used for the color superconducting high-density quark matter phase. We find that this is possible for the scalar diquark (pairing) interaction, but the vector meson interaction has to be reduced so that superconducting quark matter becomes the stable phase at high densities. We compare our equation of state with recent phenomenological parametrizations based on generic stability conditions for neutron stars. We find that the maximum mass of a hybrid star, with a color superconducting quark matter core, exceeds 2.01 ± 0.04 M⊙, which is the value of the recently observed massive neutron star PSR J0348+0432. The mass-radius relation is also consistent with gravitational wave observations (GW170817).

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1763708

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 101; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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