Building a realistic neutron star from holography

Abstract

We employ the recently improved description of dense baryonic matter within the Witten-Sakai-Sugimoto model to construct neutron stars. In contrast to previous holographic approaches, the presence of an isospin asymmetry allows us to implement beta equilibrium and electric charge neutrality. As a consequence, we are able to model the crust of the star within the same formalism and compute the location of the crust-core transition dynamically. After showing that a simple pointlike approximation for the baryons fails to satisfy astrophysical constraints, we demonstrate that our improved description does account for neutron stars that meet the current experimental constraints for mass, radius, and tidal deformability. However, we also point out tensions in the parameter fit and large-$N_c$ artifacts and discuss how to potentially resolve them in the future.

19 pages, 12 figures; v2: small correction in Table I, reference added, accepted for publication in PRD; v3: typos in last line of p7 and equation (34b) corrected

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Cited by in corpus (8)

• On the Sound Speed in Neutron Stars
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• Dense and Hot QCD at Strong Coupling
• Holographic approach to compact stars and their binary mergers
• Holographic dark energy from the laws of thermodynamics with Rényi entropy
• Neutron stars and phase diagram in a hard-wall AdS/QCD model
• Holographic cold dense matter constrained by neutron stars
• Symmetry energy in holographic QCD