Massive neutron stars with holographic multiquark cores

Abstract

Phases of nuclear matter are crucial in the determination of physical properties of neutron stars~(NS). In the core of NS, the density and pressure become so large that the nuclear matter possibly undergoes phase transition into a deconfined phase, consisting of quarks and gluons and their colour bound states. Even though the quark-gluon plasma has been observed in ultra-relativistic heavy-ion collisions\cite{Gyulassy, Andronic}, it is still unclear whether exotic quark matter exists inside neutron stars. Recent results from the combination of various perturbative theoretical calculations with astronomical observations\cite{Demorest, Antoniadis} shows that (exotic) quark matter could exist inside the cores of neutron stars above 2.0 solar masses ($M_{\odot }$)~\cite{Annala:2019puf}. We revisit the holographic model in Ref.~\cite{bch, bhp} and implement the equation of states~(EoS) of multiquark nuclear matter to interpolate the pQCD EoS in the high-density region with the nuclear EoS known at low densities. For sufficiently large energy density scale~(${\epsilon }_s$) of the model, it is found that multiquark phase is thermodynamically prefered than the stiff nuclear matter above the transition points. The NS with holographic multiquark core could have masses in the range $1.96-2.23(1.64-2.10)M_{\odot }$ and radii $14.3-11.8(14.0-11.1)$ km for ${\epsilon }_s=26(28)$ GeV/fm${}^3$ respectively. Effects of proton-baryon fractions are studied for certain type of baryonic EoS; larger proton fractions could reduce radius of the NS with multiquark core by less than a kilometer.

14 pages, 8 figures, 1 table

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Cited by in corpus (10)

• Holographic modeling of nuclear matter and neutron stars
• Holographic approach to compact stars and their binary mergers
• Holographic QCD in the NICER era
• Holographic cold dense matter constrained by neutron stars
• Holographic dense QCD in the Veneziano limit
• Slowly Rotating Neutron Star with Holographic Multiquark Core: I-Love-Q Relations
• Exploring the Phase Diagram of V-QCD with Neutron Star Merger Simulations
• Normal and Quasinormal Modes of Holographic Multiquark Star
• Deriving Neutron Star Equation of State from AdS/QCD
• Instability of holographic cold compact stars with a color superconducting core