Hybrid stars are compatible with recent astrophysical observations

Abstract

Compact stars (CS) are stellar remnants of massive stars. Inside CSs the density is so high that matter is in subatomic form composed of nucleons. With increase of density of matter towards the centre of the objects other degrees of freedom like hyperons, heavier non-strange baryons, meson condensates may appear. Not only that at higher densities, the nucleons may get decomposed into quarks and form deconfined strange quark matter (SQM). If it is so then CSs may contain SQM in the core surrounded by nucleonic matter forming hybrid stars (HSs). However, the nature and composition of matter inside CSs can only be inferred from the astrophysical observations of these CSs. Recent astrophysical observations in terms of CS mass-radius (M-R) relation and gravitational wave (GW) observation indicate that the matter should be soft in the intermediate density range and stiff enough at higher density range to attain the maximum possible mass above $2M_{\odot }$ which is not compatible with pure hadronic equation of states (EOSs). Consequently, we study the HS properties with different models of SQM and find that within vector bag model considering density dependent bag parameter, the model goes well with the astrophysical observations so far.

arXiv comment12 pages, 9 figures; Accepted for publication in Phys. Rev. D

References in corpus (60)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• A Massive Pulsar in a Compact Relativistic Binary
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GW170817: Measurements of Neutron Star Radii and Equation of State
• 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
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
• 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
• Hybrid stars that masquerade as neutron stars
• GW170817: Joint Constraint on the Neutron Star Equation of State from Multimessenger Observations
• Hyperon-rich Matter in Neutron Stars
• A Chiral Effective Lagrangian for Nuclei
• Neutron star radii and crusts: uncertainties and unified equations of state
• Hyperons and massive neutron stars: the role of hyperon potentials
• Composition and stability of hybrid stars with hyperons and quark color-superconductivity
• Density-Dependent Relativistic Hartree-Fock Approach
• The hadron-quark phase transition in dense matter and neutron stars
• Hyperon-hyperon interactions and properties of neutron matter
• Charge Screening at First Order Phase Transitions and Hadron - Quark Mixed Phase
• Hadron-quark mixed phase in hyperon stars
• On the appearance of hyperons in neutron stars
• Quark deconfinement in high-mass neutron stars
• Equation of state of hypernuclear matter: impact of hyperon--scalar-meson couplings
• Competition between delta isobars and hyperons and properties of compact stars
• Application of the density dependent hadron field theory to neutron star matter
• Critical Density and Impact of $\Delta (1232)$ Resonance Formation in Neutron Stars
• Meson condensation
• Implications from GW170817 for $\Delta$-isobar admixed hypernuclear compact stars
• Confronting GW190814 with hyperonization in dense matter and hypernuclear compact stars
• Deconfinement Phase Transition in Compact Stars : Maxwell vs. Gibbs Construction of the Mixed Phase
• Hyperons in neutron stars and supernova cores
• Parametric correlations in energy density functionals
• Direct Imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS
• Quark-nuclear hybrid equation of state for neutron stars under modern observational constraints
• Constraining strangeness in dense matter with GW170817
• Cooling of hypernuclear compact stars
• Modified MIT bag Models -- part I: Thermodynamic consistency, stability windows and symmetry group
• Dense matter equation of state of a massive neutron star with anti-kaon condensation
• Hypernuclear stars from relativistic Hartree-Fock density functional theory
• Massive $\Delta$-resonance admixed hypernuclear stars with anti-kaon condensations
• Density Dependence of Nucleon Bag Constant, Radius and Mass in an Effective Field Theory Model of QCD
• Finite-size effects on the hadron-quark phase transition in neutron stars
• Modified MIT Bag Models -- part II: QCD phase diagram and hot quark stars
• Broken SU(6) symmetry and massive hybrid stars
• Effects of the quark-hadron phase transition on highly magnetized neutron stars
• Pairing phase transition: A Finite-Temperature Relativistic Hartree-Fock-Bogoliubov study
• Systematic study on the quark-hadron mixed phase in compact stars
• Tidal deformability of strange stars and the GW170817 event
• Equation of state of strongly magnetized matter with hyperons and $\Delta$-resonances
• Strange Stars with a Density-Dependent Bag Parameter
• Hybrid Equations of State for Neutron Stars with Hyperons and Deltas
• Compact star merger events with stars composed of interacting strange quark matter
• The effect of a density dependent bag constant on the structure of hot neutron star with a quark core
• Properties of Hybrid Stars with Density Dependent Bag Model
• Reevaluation of the density dependence of nucleon radius and mass in the global color symmetry model of QCD
• Baryonic dense matter in view of gravitational-wave observations
• Influence of the nuclear symmetry energy slope on observables of compact stars with $\Delta$-admixed hypernuclear matter
• Spin-down induced quark-hadron phase transition in cold isolated neutron stars

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• XTE J1814-338 as a dark matter admixed neutron star
• XTE J1814-338: A potential hybrid star candidate
• Universal relations for compact stars with exotic degrees of freedom
• Non-radial oscillations in newly born compact star considering effects of phase transition
• Modern nuclear and astrophysical constraints of dense matter in a renormalized chiral approach
• Analyzing the dense matter equation of states in the light of the compact object HESS J1731-347
• Non-radial oscillations of hadronic neutron stars, quark stars, and hybrid stars : Calculation of $f$, $p$, and $g$ mode frequencies
• Hadron-quark phase transition in the neutron star with vector MIT bag model and Korea-IBS-Daegu-SKKU functional
• On the Cooling of Compact Stars in Light of the HESS J1731-347 Remnant
• Exact Analytical Taub-NUT like Solution in f(T) Gravity