Equation of state for hyperonic neutron-star matter in SU(3) flavor symmetry

Abstract

Using a relativistic mean-field model calibrated to finite-nucleus observables and bulk properties of dense nuclear matter, we investigate hyperonic neutron-star matter within an SU(3) flavor-symmetry scheme. To retain SU(6)-based couplings within SU(3) flavor symmetry, we add a quartic $\varphi$ self-interaction and $\varphi$-$\rho$ mixing. We demonstrate the roles of ${\alpha }_v$ ($F/(F+D)$ ratio), ${\theta }_v$ (mixing angle), and $z_v$ (singlet-to-octet coupling ratio) in SU(3)-invariant vector-meson couplings. It is found that $z_v$ predominantly controls the maximum mass of a neutron star, and $2M_{\odot }$ neutron stars can be supported for $z_v\le 0.15$. The ${\alpha }_v$ also helps sustain large masses, whereas ${\theta }_v$ has a smaller effect on neutron-star properties. This SU(3) framework reconciles nuclear and astrophysical constraints, and offers a plausible resolution to the hyperon puzzle.

15 pages, 7 figures, 3 tables

References in corpus (44)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Relativistic Continuum Hartree Bogoliubov Theory for Ground State Properties of Exotic Nuclei
• Neutron-Rich Nuclei in Heaven and Earth
• Accurate Determination of the Neutron Skin Thickness of ${}^{208}$Pb through Parity-Violation in Electron Scattering
• Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations
• Sound velocity bound and neutron stars
• In-medium nuclear interactions of low-energy hadrons
• Precision Determination of the Neutral Weak Form Factor of ${}^{48}$Ca
• A NICER View of the Nearest and Brightest Millisecond Pulsar: PSR J0437$\unicode{x2013}$4715
• An updated mass-radius analysis of the 2017-2018 NICER data set of PSR J0030+0451
• Nuclear Physics from Lattice QCD
• The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
• Chiral Effective Field Theory and the High-Density Nuclear Equation of State
• Estimation of the effect of hyperonic three-body forces on the maximum mass of neutron stars
• Isospin-dependent properties of asymmetric nuclear matter in relativistic mean-field models
• Twenty-first Century Lattice Gauge Theory: Results from the QCD Lagrangian
• A NICER View of PSR J1231$-$1411: A Complex Case
• Dirac-Brueckner-Hartree-Fock calculations for isospin asymmetric nuclear matter based on improved approximation schemes
• g-mode Oscillations in Hybrid Stars: A Tale of Two Sounds
• EoS for massive neutron stars
• Role of vector self-interaction in Neutron Star properties
• Momentum Shell in Quarkyonic Matter from Explicit Duality: A Dual Model for Cold, Dense QCD
• Can the PREX-2 and CREX results be understood by relativistic mean-field models with the astrophysical constraints?
• Asymmetric nuclear matter in relativistic mean-field models with isoscalar- and isovector-meson mixing
• The baryon coupling scheme in an unified SU(3) and SU(6) symmetry formalism
• Effects of $\varphi$-meson on properties of hyperon stars in density dependent relativistic mean field model
• Quark-meson coupling model with the cloudy bag
• Effects of $\Lambda$ hyperons on the nuclear equation of state in a Dirac-Brueckner-Hartree-Fock model
• Constraints on Nuclear Saturation Properties from Terrestrial Experiments and Astrophysical Observations of Neutron Stars
• On the Speed of Sound in Hyperonic Stars
• g-mode Oscillations in Neutron Stars with Hyperons
• Constraints from $\Lambda$ hypernuclei on the $\Lambda NN$ content of the $\Lambda$-nucleus potential
• $\Lambda$ hypernuclear potentials beyond linear density dependence
• Astrophysics and Nuclear Physics Informed Interactions in Dense Matter: Inclusion of PSR J0437-4715
• Hyperonic Neutron Star Matter in Light of GW170817
• Massive relativistic compact stars from SU(3) symmetric quark models
• Hyperons, deconfinement and the speed of sound in neutron stars
• Influence of effective nucleon mass on equation of state for supernova simulations and neutron stars
• A closer look at the Yukawa's interaction from a symmetry group perspective
• Model-Independent Determination of the Tidal Deformability of a 1.4 $M_{\odot }$ Neutron Star from Gravitational-Wave Measurements
• Compatibility of recent $\Xi$-nuclear bound state signals
• Novel features of asymmetric nuclear matter from terrestrial experiments and astrophysical observations of neutron stars