Massive relativistic compact stars from SU(3) symmetric quark models

Abstract

We construct a set of hyperonic equations of state (EoS) by assuming SU(3) symmetry within the baryon octet and by using a covariant density functional (CDF) theory approach. The low-density regions of our EoS are constrained by terrestrial experiments, while the high-density regime is modeled by systematically varying the nuclear matter skewness coefficient $Q_{\mathrm{sat}}$ and the symmetry energy slope $L_{\mathrm{sym}}$. The sensitivity of the EoS predictions is explored in terms of $z$ parameter of the SU(3) symmetric model that modifies the meson-hyperon coupling constants away from their SU(6) symmetric values. Our results show that model EoS based on our approach can support static Tolman-Oppenheimer-Volkof (TOV) masses in the range $2.3$-$2.5M_{\odot }$ in the large-$Q_{\mathrm{sat}}$ and small-$z$ regime, however, such stars contain only a trace amount of hyperons compared to SU(6) models. We also construct uniformly rotating Keplerian configurations for our model EoS for which the masses of stellar sequences may reach up to $3.0M_{\odot }$. These results are used to explore the systematic dependence of the ratio of maximum masses of rotating and static stars, the lower bound on the rotational frequency of the models that will allow secondary masses in the gravitational waves events to be compact stars with $M_2\lesssim 3.0M_{\odot }$ and the strangeness fraction on the model parameters. We conclude that very massive stellar models can be, in principle, constructed within the SU(3) symmetric model, however, they are nucleonic-like as their strangeness fraction drops below 3\%.

11 pages, 7 figures

References in corpus (39)

• 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
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
• Constraining the Maximum Mass of Neutron Stars From Multi-Messenger Observations of GW170817
• Accurate Determination of the Neutron Skin Thickness of ${}^{208}$Pb through Parity-Violation in Electron Scattering
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• Implications of PREX-II on the equation of state of neutron-rich matter
• Modeling GW170817 based on numerical relativity and its implications
• Constraining Neutron-Star Matter with Microscopic and Macroscopic Collisions
• Neutron Stars and the Nuclear Equation of State
• Impact of the PSR J0740+6620 radius constraint on the properties of high-density matter
• GW190814: Impact of a 2.6 solar mass neutron star on nucleonic equations of state
• A lower bound on the maximum mass if the secondary in GW190814 was once a rapidly spinning neutron star
• GW190814 as a massive rapidly-rotating neutron star with exotic degrees of freedom
• Information content of the parity-violating asymmetry in ${}^{208}$Pb
• Was GW190814 a black hole -- strange quark star system?
• Equation of State for Nucleonic and Hyperonic Neutron Stars with Mass and Radius Constraints
• Constraining hypernuclear density functional with $\Lambda$-hypernuclei and compact stars
• GW190814's secondary component with mass $(2.50-2.67)$ M${}_{\odot }$ as a super-fast pulsar
• Confronting GW190814 with hyperonization in dense matter and hypernuclear compact stars
• Implications from GW170817 for $\Delta$-isobar admixed hypernuclear compact stars
• The possibility of the secondary object in GW190814 as a neutron star
• Impact of the neutron star crust on the tidal polarizability
• Relativistic hypernuclear compact stars with calibrated equations of state
• GW190814: On the properties of the secondary component of the binary
• Delta baryons and diquark formation in the cores of neutron stars
• Maximum mass of compact stars from gravitational wave events with finite-temperature equations of state
• Many-body forces in the equation of state of hyperonic matter
• QCD color superconductivity in compact stars: color-flavor locked quark star candidate for the gravitational-wave signal GW190814
• Rapidly rotating $\Delta$-resonance-admixed hypernuclear compact stars
• Rapidly Spinning Compact Stars with Deconfinement Phase Transition
• Supermassive Neutron Stars Rule Out Twin Stars
• Effects of $\varphi$-meson on properties of hyperon stars in density dependent relativistic mean field model
• FRB 181112 as a Rapidly-Rotating Massive Neutron Star just after a Binary Neutron Star Merger?: Implications for Future Constraints on Neutron Star Equations of State

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• g-mode Oscillations in Neutron Stars with Hyperons
• Correlation of the hyperon potential stiffness with hyperon constituents in neutron stars and heavy-ion collisions
• A closer look at the Yukawa's interaction from a symmetry group perspective
• Hadron-quark phase transition in neutron star by combining the relativistic Brueckner-Hartree-Fock theory and Dyson-Schwinger equation approach
• Equation of state for hyperonic neutron-star matter in SU(3) flavor symmetry
• Effects of Phi and ${\sigma }^{\ast }$-meson on properties of hyperon stars including $\Delta$ resonance