Hybrid stars that masquerade as neutron stars

Abstract

We show that a hybrid (nuclear + quark matter) star can have a mass-radius relationship very similar to that predicted for a star made of purely nucleonic matter. We show this for a generic parameterization of the quark matter equation of state, and also for an MIT bag model, each including a phenomenological correction based on gluonic corrections to the equation of state. We obtain hybrid stars as heavy as 2 M_solar for reasonable values of the bag model parameters. For nuclear matter, we use the equation of state calculated by Akmal, Pandharipande, and Ravenhall using many-body techniques. Both mixed and homogeneous phases of nuclear and quark matter are considered.

22 pages, LaTeX. Extra figure and explanation added

References in corpus (10)

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• Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region
• Evaluating the Gapless Color-Flavor Locked Phase
• Hybrid stars with the color dielectric and the MIT bag models
• Quark mass effects on the stability of hybrid stars
• Bulk Viscosity in Hybrid Stars
• Phase Structure of 2-Flavor Quark Matter: Heterogeneous Superconductors
• Neutrino scattering off pair-breaking and collective excitations in superfluid neutron matter and in color-flavor locked quark matter
• New phases in CFL quark matter

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• Rotational Properties of Inverted Hybrid Stars
• Compact Stars as Hideouts For Color-spin-locked Quark Matter: Implications for Powering High-energy Electromagnetic Emissions
• Quark stars in $D_3$-$D_7$ holographic model
• Modeling Solids in Nuclear Astrophysics with Smoothed Particle Hydrodynamics
• Constraints on color-flavor locked quark matter in view of the HESS J1731-347 measurement
• Bayesian analysis of multimessenger M-R data with interpolated hybrid EoS
• Strange Matter
• Effective Field Theories for Neutron Stars Physics
• Fundamental and higher-order excited modes of radial oscillation of neutron stars for various types of cold nucleonic and hyperonic matter
• Structure of hot strange quark stars: an NJL model approach at finite temperature
• Application of Kaluza-Klein Theory in Modeling Compact Stars: Exploring Extra Dimensions
• On the conversion of neutron stars into quark stars
• Anisotropic pressure effect on central EOS of PSR J0740+6620 in the light of dimensionless TOV equation
• How Neutron Star Observations Point Towards Exotic Matter: Existing Explanations and a Prospective Proposal
• Gapless color-flavor locked phase in quark and hybrid stars
• $\varphi$-modes of neutron stars in a massless scalar-tensor theory
• Dineutron decay into sterile anti-neutrinos in neutron stars and its observable consequences
• General relativistic hydrodynamic simulations of binary strange star mergers
• Structure and cooling of compact stars
• Rapidly Spinning Massive Pulsars as an Indicator of Quark Deconfinement
• From nuclear structure to neutron stars
• Imprints of Non-Symmetric Dark Matter Halos on Magnetars: A Two-Fluid Perspective
• Fully general-relativistic simulations of isolated and binary strange quark stars
• Precise constraint on properties of neutron stars through new universal relations and astronomical observations
• Properties of rotating neutron stars in light of binary compact object mergers
• Role of thermal fluctuations in nucleation of three-flavor quark matter
• Electrically charged compact stars with an interacting quark equation of state
• Pair luminosity and cooling of newborn strange star: unpaired quarks
• The amazing properties of crystalline color superconductors
• Surface structure of Quark stars with magnetic fields
• Torsional oscillations of strange stars
• Partial restoration of chiral symmetry in hot and dense neutron matter
• The effect of multiple extra dimensions on the maximal mass of compact stars in Kaluza-Klein space-time
• $f$-mode Oscillations for Hyperons and H-dibaryons in Neutron Stars
• Signatures of deconfined quark phases in binary neutron star mergers
• Constraining the parameterized neutron star equation of state with astronomical observations
• Probing neutron stars with the full pre-merger and post-merger gravitational wave signal from binary coalescences
• Massive Neutron Stars and White Dwarfs as Noncommutative Fuzzy Spheres
• Modern compact star observations and the quark matter EoS
• Two fluid CFL strange quark stars with scalar dark matter: critical mass and mass gap implications
• Structure and Cooling of Neutron and Hybrid Stars
• Modeling the Light Curve and Spectra of SN 2023aew
• Charged charm stars
• Gravitational-wave asteroseismology with f-modes from neutron star binaries at the merger phase
• Investigating the mass-ratio dependence of the prompt-collapse threshold with numerical-relativity simulations
• Differentiating between sharp and smoother phase transitions in neutron stars
• Universal Relations for the Increase in the Mass and Radius of a Rotating Neutron Star