Probing Quarkyonic Matter in Neutron Stars with the Bayesian Nuclear-Physics Multi-Messenger Astrophysics Framework

Abstract

The interior of neutron stars contains matter at the highest densities realized in our Universe. Interestingly, theoretical studies of dense matter, in combination with the existence of two solar mass neutron stars, indicate that the speed of sound $c_s$ has to increase to values well above the conformal limit ($c_s^2\sim 1/3$) before decreasing again at higher densities. The decrease could be explained by either a strong first-order phase transition or a cross-over transition from hadronic to quark matter. The latter scenario leads to a pronounced peak in the speed of sound reaching values above the conformal limit, naturally explaining the inferred behavior. In this work, we use the Nuclear-Physics Multi-Messenger Astrophysics framework \textsc{NMMA} to compare predictions of the quarkyonic matter model with astrophysical observations of neutron stars, with the goal of constraining model parameters. Assuming quarkyonic matter to be realized within neutron stars, we find that there can be a significant amount of quarks inside the core of neutron stars with masses in the two solar mass range, amounting to up to $\sim 0.13M_{\odot }$, contributing $\sim 5.9\%$ of the total mass. Furthermore, for the quarkyonic matter model investigated here, the radius of a $1.4M_{\odot }$ neutron star would be $13.44_{-1.54}^{+1.69}(13.54_{-1.04}^{+1.02})$ km, at $95\%$ credibility, without (with) the inclusion of AT2017gfo.

14 pages, 10 figures

References in corpus (31)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Multi-messenger Observations of a Binary Neutron Star Merger
• Advanced LIGO
• 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
• Constraining neutron star tidal Love numbers with gravitational wave detectors
• 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
• Accurate Determination of the Neutron Skin Thickness of ${}^{208}$Pb through Parity-Violation in Electron Scattering
• Constraining Neutron-Star Matter with Microscopic and Macroscopic Collisions
• Sound velocity bound and neutron stars
• Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
• Reconstructing the neutron-star equation of state with gravitational-wave detectors from a realistic population of inspiralling binary neutron stars
• Impact of the PSR J0740+6620 radius constraint on the properties of high-density matter
• Astrophysical Constraints on the Symmetry Energy and the Neutron Skin of ${}^{208}$Pb with Minimal Modeling Assumptions
• How perturbative QCD constrains the Equation of State at Neutron-Star densities
• Trace anomaly as signature of conformality in neutron stars
• Ab-initio QCD calculations impact the inference of the neutron-star-matter equation of state
• The Radius of PSR J0740+6620 from NICER with NICER Background Estimates
• A Detailed Examination of Astrophysical Constraints on the Symmetry Energy and the Neutron Skin of ${}^{208}$Pb with Minimal Modeling Assumptions
• Nuclear equation of state for arbitrary proton fraction and temperature based on chiral effective field theory and a Gaussian process emulator
• An updated nuclear-physics and multi-messenger astrophysics framework for binary neutron star mergers
• On the possibility of GW190425 being a black hole--neutron star binary merger
• Perturbative QCD and the Neutron Star Equation of State
• Equation of State of Cold Quark Matter to $O({\alpha }_s^3\ln {\alpha }_s)$
• Is GW190425 consistent with being a neutron star$-$black hole merger?
• Parameter estimation for strong phase transitions in supranuclear matter using gravitational-wave astronomy
• Quarkyonic matter and quarkyonic stars in an extended RMF model

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• Bayesian Inference of Fine-Features of Nuclear Equation of State from Future Neutron Star Radius Measurements to 0.1km Accuracy
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• Neural Simulation-Based Inference of the Neutron Star Equation of State directly from Telescope Spectra
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• Strong Gravity Extruding Peaks in Speed of Sound Profiles of Massive Neutron Stars
• Quarkyonic picture of isospin QCD
• Unraveling Trace Anomaly of Supradense Matter via Neutron Star Compactness Scaling
• IIb or not IIb: A Catalog of ZTF Kilonova Imposters
• New Insights into Supradense Matter from Dissecting Scaled Stellar Structure Equations
• Neutron Star Radii from Laboratory Experiments
• Direct Inference of Nuclear Equation-of-State Parameters from Gravitational-Wave Observations
• Star Log-extended eMulation: a method for efficient computation of the Tolman-Oppenheimer-Volkoff equations
• Scaling relations for the uncertainty in neutron star radius inferred from pulse profile modelling: the effect of spin rate
• Impact of Accretion Assumptions on Pulse Profile Modelling of Superburst Oscillations in 4U 1636-536
• Correlations between nuclear incompressibility, liquid-gas critical point, and quarkyonic transition
• Is The Trace Anomaly at its Minimum Value at Neutron Star Centers?
• Toward a Unified Understanding of the Dense Matter Equation of State
• The maximum mass and rotational kinetic energy of rapidly rotating neutron stars