Deconfinement of non-strange hadronic matter with nucleons and $\Delta$ baryons to quark matter in neutron stars

Abstract

We explore the possibility of formation of $\Delta$ baryons (1232 MeV) in neutron star matter in an effective chiral model within the relativistic mean-field framework. With variation in delta-meson couplings, consistent with the constraints imposed on them, the resulting equation of state is obtained and the neutron star properties are calculated for static and spherical configuration. Within the framework of our model the critical densities of formation of $\Delta$s and the properties of neutron stars are found to be very sensitive to the iso-vector coupling compared to the scalar or vector couplings. We revisit the $\Delta$ puzzle and look for the possibility of phase transition from non-strange hadronic matter (including nucleons and $\Delta$s) to deconfined quark matter, based on QCD theories. The resultant hybrid star configurations satisfy the observational constraints on mass from the most massive pulsars PSR J1614-2230 and PSR J0348+0432 in static condition obtained with the general hydrostatic equilibrium based on GTR. Our radius estimates are well within the limits imposed from observational analysis of QLMBXs. The obtained values of $R_{1.4}$ are in agreement with the recent bounds specified from the observation of gravitational wave (GW170817)from binary neutron star merger. The constraint on baryonic mass from study of binary system PSR J0737-3039 is also satisfied with our hybrid equation of state. \noindent{Keywords: Delta baryons, Quark matter, Phase transition, Equation of State, Neutron Stars, Hybrid Stars}

arXiv comment30 pages, 19 figures

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Cited by in corpus (9)

• Nuclear matter at finite temperature and static properties of proto-neutron star
• A Detailed Analysis of the Special Points on $M-R$ Solutions of Hybrid (Twin) Stars
• Effects of hadron-quark phase transition on properties of Neutron Stars
• Properties of Hybrid Stars with Density Dependent Bag Model
• Variation of delta baryon mass and hybrid star properties in static and rotating conditions
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• Role of $\Delta$s in determining the properties of Neutron Stars in parameterized hydrostatic equilibrium
• Estimation of transport coefficients of dense hadronic and quark matter
• A study of the elastic $\pi N$ scattering at finite baryon density