Studies of the structure of massive hybrid stars within a modified NJL model

2018/04/28 by Cheng-Ming Li, Jinli Zhang, Jin-Li Zhang +3
Physics and Astronomy · #Astrophysics #Cosmology and Gravitation Theories #Deconfinement #Equation of state #Hadron #High-Energy Particle Collisions Research #Particle physics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Quark #Quark star #Solar mass #Star (game theory) #Stars #Strange matter #astro-ph.HE #nucl-th

paper · pdf · doi:10.1103/physrevd.97.103013

published as Physical Review D 97, 103013 (2018)

arxiv created 2018/04/28 · openalex publication_date 2018/05/21 · arxiv updated 2018/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In this paper, we use the equation of state based on a modification of the 2+1 flavors Nambu-Jona-Lasinio (NJL) model to study the quark matter of hybrid stars. For comparison, we utilize five EOSs of the relativistic mean-field (RMF) model to describe the hadronic phase. With the three-window crossover interpolation approach, we try to construct relatively soft hybrid EOSs but find the maximum masses of hybrid stars do not differ much. The results are quite close to the 2 solar mass, which is consistent with the mass constraint of PSR J0348+0432. Furthermore, it is noteworthy that the heaviest stable stars have central densities higher than that of the deconfinement transition, suggesting a pure quark core in the hybrid star.

Citations

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