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High Energy Physics - Phenomenology

arXiv:2111.03374 (hep-ph)
[Submitted on 5 Nov 2021 (v1), last revised 28 Feb 2022 (this version, v3)]

Title:Building a realistic neutron star from holography

Authors:Nicolas Kovensky, Aaron Poole, Andreas Schmitt
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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.
Comments: 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
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics - Theory (hep-th); Nuclear Theory (nucl-th)
Cite as: arXiv:2111.03374 [hep-ph]
  (or arXiv:2111.03374v3 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2111.03374
Related DOI: https://doi.org/10.1103/PhysRevD.105.034022

Submission history

From: Aaron Poole [view email]
[v1] Fri, 5 Nov 2021 10:30:05 UTC (1,903 KB)
[v2] Fri, 4 Feb 2022 15:53:16 UTC (1,865 KB)
[v3] Mon, 28 Feb 2022 16:27:36 UTC (952 KB)
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