Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints

2025/09/09 by Zhang, Nai-Bo, Li, Bao-An, Zhang, Jia-Yu +2 · 4 citations
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2509.07767

Abstract

We investigate how simultaneous mass and radius measurements of massive neutron stars (NSs) can help constrain properties of dark matter (DM) possibly admixed in them. Within a fermionic DM model that interacts only through gravitation, along with a well-constrained nuclear matter equation of state, we show that the simultaneous mass and radius measurement of PSRJ0740+6620 reduces the uncertainty of DM central energy density by more than 50% compared to the results obtained from using the two observables independently, while other DM parameters remain unconstrained. Additionally, we find that the DM fraction f_D should be smaller than 2% when constrained by the observed NS maximum mass alone, and it could be even smaller than 0.3% with the simultaneous measurement of mass and radius, supporting the conclusion that only a small amount of DM exists in DM admixed neutron stars (DANS).

Citations

• Exploring Fermionic Dark Matter Admixed Neutron Stars in the Light of Astrophysical Observations
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Cited by

• Neutron Star Equation of State with Nucleon Short-Range Correlations: A Concise Review and Open Issues
• Fermionic versus Bosonic Dark Matter in Neutron Stars: A Bayesian Study with Multi-Density Constraints
• Nucleon Short-Range Correlations and High-Momentum Dynamics: Implications on the Equation of State of Dense Matter
• Beyond ρ^2/3 Scaling: Microscopic Origins and Multimessengers of High-Density Nuclear Symmetry Energy

Related

• Constraints on the parameter space in dark matter admixed neutron stars
• Probing fermionic asymmetric dark matter cores using global neutron star properties
• Interpreting Mass and Radius Measurements of Neutron Stars with Dark Matter Halos
• Exploring Fermionic Dark Matter Admixed Neutron Stars in the Light of Astrophysical Observations
• Constraining bosonic asymmetric dark matter with neutron star mass-radius measurements