Abstract
We investigate the impact of hyperon and dark matter on macroscopic properties of neutron stars, including mass, radius, gravitational redshift, and moment of inertia, within the framework of relativistic mean field theory. Our findings reveal that the absorbing of hyperon and dark matter components significantly softens the equation of state of neutron star. Dark matter Fermi momentum varies between 0 and 0.06 GeV, and all types of neutron stars yield to the current observational constraints with dark matter Fermi momentum being \(k_{f}^{DM}=0.03\text{ GeV}\). In addition, both hyperons and dark matter increase the gravitational redshift while decreasing the moment of inertia. Lastly, we present the linear relationships between mass, gravitational redshift and moment of inertia that can further assist in identifying neutron star types.
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We thank the anonymous referees for many useful comments and suggestions.
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This work was supported by the Natural Science Foundation of China (Grant No.12105231), the Guiding Local Science and Technology Development Projects by the Central Government of China (Grant No. 2021ZYD0031)and the Natural Science Foundation of Sichuan Province (Grant No. 2023NSFSC1348).
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Xueling Mu: Main calculation and writing work. Bin Hong: Writing of the program and confirmation of the overall idea. Xia Zhou and Zhongwen Feng: Fund management and article revision.
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Mu, X., Hong, B., Zhou, X. et al. The effects of dark matter and hyperons on the macroscopic properties of neutron star. Astrophys Space Sci 368, 67 (2023). https://doi.org/10.1007/s10509-023-04224-z
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DOI: https://doi.org/10.1007/s10509-023-04224-z