Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints
arXiv:2509.07767 · doi:10.3390/sym17101669
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 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).
14 pages, 5 figures, published in Symmetry
References in corpus (15)
- A direct empirical proof of the existence of dark matter
- New results from DAMA/LIBRA
- Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
- Search for Low-Mass WIMPs with SuperCDMS
- Constraining Asymmetric Dark Matter through observations of compact stars
- Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T
- Low-Mass Dark Matter Search with CDMSlite
- The dark matter effect on realistic equation of state in neutron stars
- Too massive neutron stars: The role of dark matter?
- Search for Coherent Elastic Scattering of Solar B Neutrinos in the XENON1T Dark Matter Experiment
- Dark matter admixed neutron star as a possible compact component in the GW190814 merger event
- Implications of the mass M of PSR~J0740+6620 on the Equation of State of Super-Dense Neutron-Rich Nuclear Matter
- Dark Matter Effects on the Compact Star Properties
- Exploring the distribution and impact of bosonic dark matter in neutron stars
- The impact of asymmetric dark matter on the thermal evolution of nucleonic and hyperonic compact stars