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Effects of a Brueckner-Hartree-Fock–corrected effective mass on speed of sound, conformality, and observables of dark matter–admixed neutron stars

Arijit Das1,*, Prashanth Jaikumar2,†, Adarsh Karekkat1,3,‡, and Tanumoy Mandal1,§

  • *Contact author: arijit21@iisertvm.ac.in
  • †Contact author: prashanth.jaikumar@csulb.edu
  • ‡Contact author: adarsh.karekkat@unicaen.fr
  • §Contact author: tanumoy@iisertvm.ac.in
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Phys. Rev. C 112, 055803 – Published 20 November, 2025

DOI: https://doi.org/10.1103/9qlh-w64b

Abstract

We construct an equation of state describing cold and dense matter in the core of neutron stars which includes an admixture of fermionic dark matter and incorporates nucleon effective masses derived from the relativistic Brueckner-Hartree-Fock (BHF) many-body approach within a relativistic mean-field model. Such a BHF-informed mixed-model approach increases stellar compactness, with mass-radius configurations that are consistent with smaller, lighter pulsars. The model displays the expected nonmonotonic behavior of sound speed hinted at by neutron-star data and is closer to the conformal bound at maximum mass. We find that the model displays tension with bounds on heavier pulsars, suggesting that the hypothesis of an aggregated dark component in neutron stars needs further critical study.

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Phys. Rev. C 112, 055803– Published 20 November, 2025
  • Received 23 June 2025
  • Accepted 12 September 2025
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