Hybrid stars can be self-bound

Based on the properties of uniform nuclear matter at the nuclear saturation density and basic thermodynamic relations, we first re-study the composition of matter on the surface of normal neutron stars and hybrid stars. It is found that the hybrid stars are composed of uniform hadronic matter on the...

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Bibliographic Details
Published in:arXiv.org 2021-05
Main Authors: Li-Qun Su, Yan, Yan, Cheng-Ming, Li, Yong-Feng, Huang, Zong, Hongshi
Format: Article
Language:English
Subjects:
Celestial bodies
Density
Equations of state
Formability
Hadrons
Heavy nuclei
Interpolation
Neutron stars
Nuclear matter
Quarks
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Summary:Based on the properties of uniform nuclear matter at the nuclear saturation density and basic thermodynamic relations, we first re-study the composition of matter on the surface of normal neutron stars and hybrid stars. It is found that the hybrid stars are composed of uniform hadronic matter on the surface rather than heavy nuclei. Then we use the Walceka model and the self-consistent NJL model to describe the equation of state of low-density hadrons and quark matter at high densities respectively, and the P--interpolation method is employed to connect the equation of state at the extreme densities to study hybrid stars. As a result, we find that the obtained hybrid star mass-radius relation and tidal deformability meet the latest astronomical data. More importantly, we find that the hybrid stars we obtained can be self-bound rather than gravitationally bound, which is completely different from previous related studies.
ISSN:2331-8422
DOI:10.48550/arxiv.2104.01519