Two-solar-mass hybrid stars: a two model description with the Nambu-Jona-Lasinio quark model

Abstract

Hybrid stars with a quark phase described by the Nambu$-$Jona-Lasinio model are studied. The hadron-quark model used to determine the stellar matter equation of state favors the appearance of quark matter: the coincidence of the deconfinement and chiral transitions and a low vacuum constituent quark mass. These two properties are essential to build equations of state that predict pure quark matter in the center of neutron stars. The effect of vector-isoscalar and vector-isovector terms is discussed, and it is shown that the vector-isoscalar terms are necessary to describe 2$M_{\odot }$ hybrid stars, and the vector-isovector terms result in larger quark cores and a smaller deconfinement density.

17 pages, 4 figures, 7 tables; PRD version

References in corpus (8)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Modern compact star observations and the quark matter equation of state
• Equation of state and thickness of the inner crust of neutron stars
• Stability of CFL cores in Hybrid Stars
• Analysis of U${}_A$(1) symmetry-breaking and restoration effects on the scalar-pseudoscalar spectrum
• Repulsive Vector Interaction in Three Flavor Magnetized Quark and Stellar Matter
• Chiral model approach to quark matter nucleation in neutron stars

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• Neutron stars with large quark cores
• Quark matter in light neutron stars
• A Bayesian analysis of the properties of hybrid stars with the NJL model
• Hadron-quark phase transition in the SU(3) local Nambu-Jona-Lasinio (NJL) model with vector interaction
• Hybrid stars with large strange quark cores constrained by GW170817
• Non-strange quark stars within resummed QCD
• Modern nuclear and astrophysical constraints of dense matter in a renormalized chiral approach
• PNJL model at zero temperature: three-flavor case
• Hybrid stars with large quark cores within the parity doublet model and modified NJL model
• Polytropic fits of modern and unified equations of state
• Quasi-universal relations in the context of future neutron star detections
• Asymptotically conformal CFL quark matter within a nonlocal chiral quark model
• Equation of state for strange quark matter: Linking the Nambu--Jona-Lasinio model to perturbative QCD
• Role of the conserved charges in the chiral symmetry restoration phase transition
• Correlation between the symmetry energy slope and the deconfinement phase transition
• Hybrid stars and QCD phase transition with a NJL-like model
• Strange stars admixed with dark matter: equiparticle model in a two fluid approach
• Quark confinement in an equiparticle quark model: application to stellar matter
• Bayesian inference favors quark matter in neutron star interiors
• The mixed phase quark core in massive hybrid stars
• Hybrid stars from a constrained equation of state
• Scalarized Hybrid Neutron Stars in Scalar Tensor Gravity
• Isentropic thermodynamics across the hadron-quark mixed phase in a two-phase model with a PNJL quark description