Confronting GW190814 with hyperonization in dense matter and hypernuclear compact stars

Abstract

We examine the possibility that the light companion in the highly asymmetric binary compact object coalescence event GW190814 is a hypernuclear star. We use density functional theory with functionals that have been tuned to the properties of $\Lambda$ hypernuclei as well as astrophysical constraints placed by the masses of the most massive millisecond pulsars, the mass-radius range inferred from the NICER experiment, and the binary neutron star merger event GW170817. We compute general-relativistic static and maximally rotating Keplerian configurations of purely nucleonic and hypernuclear stars. We find that while nucleonic stars are broadly consistent with a neutron star being involved in GW190814, this would imply no new degrees of freedom in the dense matter up to 6.5 times the nuclear saturation density. Allowing for hyperonization of dense matter, we find that the maximal masses of hypernuclear stars, even for maximal rapidly rotating configurations, are inconsistent with a stellar nature interpretation of the light companion in GW190814, implying that this event involved two black holes rather than a neutron star and a black hole.

5 pages, 4 figures; v2: minor editorial improvements, matches published version

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• Progress in Constraining Nuclear Symmetry Energy Using Neutron Star Observables Since GW170817
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• Limiting masses and radii of neutron stars and their implications
• Was GW190814 a black hole -- strange quark star system?
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• Heavy Baryons in Compact Stars
• Secondary component of gravitational-wave signal GW190814 as an anisotropic neutron star
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• Maximum mass of compact stars from gravitational wave events with finite-temperature equations of state
• QCD color superconductivity in compact stars: color-flavor locked quark star candidate for the gravitational-wave signal GW190814
• Dense matter equation of state of a massive neutron star with anti-kaon condensation
• Massive $\Delta$-resonance admixed hypernuclear stars with anti-kaon condensations
• Rapidly rotating $\Delta$-resonance-admixed hypernuclear compact stars
• Probing the nuclear equation of state from the existence of a $\sim 2.6M_{\odot }$ neutron star: the GW190814 puzzle
• On the nature of the mass-gap object in the GW190814 event
• Neutron stars and the dense matter equation of state: from microscopic theory to macroscopic observations
• GW190814: Circumstantial Evidence for Up-Down Quark Star
• The baryon coupling scheme in an unified SU(3) and SU(6) symmetry formalism
• Equation of state of strongly magnetized matter with hyperons and $\Delta$-resonances
• Heavy Magnetic Neutron Stars
• Can fermion-boson stars reconcile multi-messenger observations of compact stars?
• Effects of $\varphi$-meson on properties of hyperon stars in density dependent relativistic mean field model
• Fast ejecta as a potential way to distinguish black holes from neutron stars in high-mass gravitational-wave events
• Insights on the peak in the speed of sound of ultradense matter
• Relativistic hybrid stars with sequential first-order phase transitions in light of multimessenger constraints
• Hybrid stars are compatible with recent astrophysical observations
• Modelling a $2.5M_{\odot }$ Compact Star with Quark Matter
• Delta baryons in neutron stars
• Universal relations for compact stars with heavy baryons
• Baryonic models of ultra-low-mass compact stars for the central compact object in HESS J1731-347
• Symmetry energy effect on the secondary component of GW190814 as a neutron star
• Rapidly rotating compact stars in Rastall's gravity
• The Hadron-Quark Crossover in Neutron Star within Gaussian Process Regression Method
• Impact of The Newly Revised Gravitational Redshift of X-ray Burster GS 1826-24 on The Equation of State of Supradense Neutron-Rich Matter
• Exploring the effects of Delta Baryons in magnetars
• $2.6M_{\odot }$ Compact Object and Neutron Stars within Eddington-Inspired Born-Infeld Theory of Gravity
• Light clusters in dilute heavy-baryon admixed nuclear matter
• Bayesian Inference of dense matter equation of state of neutron star with antikaon condensation
• Massive relativistic compact stars from SU(3) symmetric quark models
• Novel Scalings of Neutron Star Properties from Analyzing Dimensionless Tolman--Oppenheimer--Volkoff Equations
• Baryonic dense matter in view of gravitational-wave observations
• Quenched Λ spin-orbit splitting by relativistic Fock diagram in single-Λ hypernuclei
• Neutron star structure with a new force between quarks
• Influence of the nuclear symmetry energy slope on observables of compact stars with $\Delta$-admixed hypernuclear matter
• Constraining exotic compact stars composed of bosonic and fermionic dark matter with gravitational wave events
• Probing the impact of Delta-Baryons on Nuclear Matter and Non-Radial Oscillations in Neutron Stars
• Massive neutron stars as mass gap candidates: Exploring equation of state and magnetic field
• Radius and equation of state constraints from massive neutron stars and GW190814
• The impact of hyperons on neutron star mergers: gravitational waves, mass ejection and black hole formation
• Hyperonization in compact stars
• Observational Probes of the Neutron Star Equation of State with Hyperons, Bosonic Dark Matter, and Quark Matter
• Properties of Rotating Neutron Star in Density-dependent Relativistic Mean-field Models
• Impact of $\Xi$-Hypernuclear Constraints on Relativistic Equation of State and Properties of Hyperon Stars
• New Insights into Supradense Matter from Dissecting Scaled Stellar Structure Equations
• Strongly interacting matter in extreme magnetic fields
• GW170817 and GW190814: tension on the maximum mass