Unified Interacting Quark Matter and its Astrophysical Implications

Abstract

We investigate interacting quark matter (IQM), including the perturbative QCD correction and color superconductivity, for both up-down quark matter ($ud$QM) and strange quark matter (SQM). We first derive an equation of state (EOS) unifying all cases by a simple reparametrization and rescaling, through which we manage to maximally reduce the number of degrees of freedom. We find, in contrast to the conventional EOS $p=1/3(\rho -4B_{\mathrm{eff}})$ for non-interacting quark matter, that taking the extreme strongly interacting limit on the unified IQM EOS gives $p=\rho -2B_{\mathrm{eff}}$, where $B_{\mathrm{eff}}$ is the effective bag constant. We employ the unified EOS to explore the properties of pure interacting quark stars (IQSs) composed of IQM. We describe how recent astrophysical observations, such as the pulsar-mass measurements, the NICER analysis, and the binary merger gravitational-wave events GW170817, GW190425, and GW190814, further constrain the parameter space. An upper bound for the maximum allowed mass of IQSs is found to be $M_{\mathrm{TOV}}\lesssim 3.23M_{\odot }$. Our analysis indicates a new possibility that the currently observed compact stars, including the recently reported GW190814's secondary component ($M=2.59_{-0.09}^{+0.08}{M}_{\odot }$), can be quark stars composed of interacting quark matter.

Final published version. 6 pages, 3 figures

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Cited by in corpus (45)

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• Bayesian inference of strange star equation of state using the GW170817 and GW190425 data
• 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
• Colour-Flavour Locked Quark Stars in Light of the Compact Object in HESS J1731-347 and the GW190814 Event
• Interacting $ud$ and $uds$ quark matter at finite densities and quark stars
• Quark stars with a unified interacting equation of state in regularized 4D Einstein-Gauss-Bonnet gravity
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• Gravitational wave echoes from interacting quark stars
• $2.6M_{\odot }$ Compact Object and Neutron Stars within Eddington-Inspired Born-Infeld Theory of Gravity
• Non-strange quark stars within resummed QCD
• Moment of inertia and compactness of quark stars within the context of $f(R,T,L_m)$ gravity
• Hybrid Strangeon Stars
• How the QCD trace anomaly behaves at the core of twin stars?
• Interface effects of quark matter: Light-quark nuggets and compact stars
• Stellar Structure and Stability of Charged Interacting Quark Stars and Their Scaling Behaviour
• Constraining free parameters of a color superconducting non-local Nambu-Jona-Lasinio model using Bayesian analysis of neutron stars mass and radius measurements
• Strange Quark Stars and Condensate Dark Stars in Bumblebee Gravity
• Rescaling strange-cluster stars and its implications on gravitational-wave echoes
• Radial and Non-Radial Oscillations of Inverted Hybrid Stars
• Universal relations for anisotropic interacting quark stars
• Two-flavor color superconducting quark stars may not exist
• Comprehensive Analysis of Constructing Hybrid Stars with an RG-consistent NJL Model
• Bayesian analysis of hybrid neutron star EOS constraints within an instantaneous nonlocal chiral quark matter model
• Bayesian inference of strangeon matter using the measurements of PSR J0437-4715 and GW190814
• The study of nonstrange quark stars within a modified NJL model
• Cold quark matter in a quasiparticle model: thermodynamic consistency and stellar properties
• Hybrid stars may have an inverted structure
• Neutron star structure with a new force between quarks
• Quarkyonic picture of isospin QCD
• Configurational entropy as a probe of the stability condition of compact objects
• The effect of pressure anisotropy on quark stars structure in the Starobinsky model
• Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework
• Strangelets at finite temperature: nucleon emission rates, interface and shell effects
• Rotational Properties of Inverted Hybrid Stars
• Comparing strange and non-strange quark stars within resummed QCD at NLO
• Strange Matter
• Extremal Instability for Topological Black Holes
• Phenomenological Scaling Relations for SQM Stars with a Massive s-Quark in Gravitationally Strong Magnetic Fields under the Spherical Symmetry Approximation
• Statistical complexity as a probe of mass and phase structure in compact objects
• Compact dwarfs made of light-quark nuggets
• Tidal Deformability of Quark Stars with Repulsive Interactions