Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915534624260096 |
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| author | Zhang, Nai-Bo Li, Bao-An Zhang, Jia-Yu Shen, Wei-Na Zhang, Hui |
| author_facet | Zhang, Nai-Bo Li, Bao-An Zhang, Jia-Yu Shen, Wei-Na Zhang, Hui |
| contents | 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). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_07767 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints Zhang, Nai-Bo Li, Bao-An Zhang, Jia-Yu Shen, Wei-Na Zhang, Hui High Energy Astrophysical Phenomena Nuclear Theory 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). |
| title | Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints |
| topic | High Energy Astrophysical Phenomena Nuclear Theory |
| url | https://arxiv.org/abs/2509.07767 |