Effects of quark-matter symmetry energy on hadron-quark coexistence in neutron-star matter

Abstract

We examine the effects of the isovector-vector coupling and hypercharge-vector coupling in quark matter on hadron-quark coexistence in neutron-star matter. The relativistic mean field theory with the TM1 parameter set and an extended TM1 parameter set are used to describe hadronic matter, and the Nambu-Jona-Lasinio model with scalar, isoscalar-vector, isovector-vector and hypercharge-vector couplings is used to describe deconfined quark matter. The hadron-quark phase transition is constructed via the Gibbs conditions for phase equilibrium. The isovector-vector and hypercharge-vector couplings in quark matter enhance the symmetry energy and hypercharge symmetry energy in neutron-star matter, while their effects are found to be suppressed at high densities by the strange quarks. As a result, the hadron-quark mixed phase shrinks with only isovector-vector coupling and moves to higher density with isovector-vector and hypercharge-vector couplings. The maximum mass of neutron-star increases slightly with isovector-vector and hypercharge-vector couplings.

arXiv comment9 pages, 7 figures

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• Neutron stars with large quark cores
• Constraint to chiral invariant masses of nucleons from GW170817 in an extended parity doublet model
• Quark matter in light neutron stars
• Symmetry energy effect on the secondary component of GW190814 as a neutron star
• Impacts of anomaly on nuclear and neutron star equation of state based on a parity doublet model
• The Hadron-Quark Crossover in Neutron Star within Gaussian Process Regression Method
• Hybrid stars with large strange quark cores constrained by GW170817
• Modern nuclear and astrophysical constraints of dense matter in a renormalized chiral approach
• Towards a unified hadron-quark equation of state for neutron stars within the relativistic mean-field model
• Effects of phase transition in hybrid stars from quark-meson coupling hadronic matter to deconfined quark matter
• Study of nuclear matter properties for Hybrid EoS
• Approaching the conformal limit of quark matter with different chemical potentials
• The mixed phase quark core in massive hybrid stars
• Hybrid stars from a constrained equation of state
• Properties of H particle-admixed compact star