Ultracompact hybrid stars consistent with multimessenger astrophysics

Abstract

In this work, we consider the consequences of phase transition in dense QCD on the properties of compact stars and implications for the observational program in gravitational wave and X-ray astrophysics. The key underlying assumption of our modeling is a strong first-order phase transition past the point where the hadronic branch of compact stars reaches the two-solar mass limit. Our analysis predicts ultracompact stars with very small radii - in the range of 6-9 km - living on compact star sequences that are entirely consistent with the current multimessenger data. We show that sequences featuring two-solar mass hadronic stars consistent with radio-pulsar observations are also consistent with the inferences of large radii for massive neutron stars by NICER X-ray observations of neutron stars and the small radii predicted by gravitational waves analysis of the binary neutron star inspiral event GW170817 for our models that feature a strong first-order QCD phase transition.

v2: matches published version, 6 pages, 5 figures

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Cited by in corpus (17)

• Nuclear and Hybrid Equations of State in Light of the Low-Mass Compact Star in HESS J1731-347
• Hybrid star models in the light of new multi-messenger data
• XTE J1814-338 as a dark matter admixed neutron star
• XTE J1814-338: A potential hybrid star candidate
• New covariant density functionals of nuclear matter for compact star simulations
• Implications of supermassive neutron stars for the form of the equation of state of hybrid stars
• Speed of sound bounds and first-order phase transitions in compact stars
• Confronting new NICER mass-radius measurements with phase transition in dense matter and twin compact stars
• Radial and Non-Radial Oscillations of Inverted Hybrid Stars
• Higgs-Confinement Transitions in QCD from Symmetry Protected Topological Phases
• Hybrid stars may have an inverted structure
• Exploring pathways to forming twin stars
• Bayesian Quantification of Observability and Equation of State of Twin Stars
• On the nature of compact stars determined by gravitational waves, radio-astronomy, x-ray emission and nuclear physics
• Impact of Multiple Phase Transitions in Dense QCD on Compact Stars
• Simultaneous explanation of XTE J1814-338 and HESS J1731-347 objects using $K^{-}$ and ${\bar{K}}^0$ condensates
• Confronting recent light compact star observations with color-flavor locked quark matter