The mixed phase quark core in massive hybrid stars
Abstract We investigate the properties of hybrid star and the mixed phase core to explore the radius ratio of the mixed phase in hybrid star. In the context of observed massive neutron stars (NSs), we examine the internal structure, phase transitions, and the impacts of the equation of state (EOS) i...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-03-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-025-14088-y |
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| author | Xuhao Wu Peng-Cheng Chu Min Ju He Liu |
| author_facet | Xuhao Wu Peng-Cheng Chu Min Ju He Liu |
| author_sort | Xuhao Wu |
| collection | DOAJ |
| description | Abstract We investigate the properties of hybrid star and the mixed phase core to explore the radius ratio of the mixed phase in hybrid star. In the context of observed massive neutron stars (NSs), we examine the internal structure, phase transitions, and the impacts of the equation of state (EOS) in maximum hybrid star. We investigate the stiffness changes in the EOS during the hadron-quark phase transition within the hybrid stars. The relativistic mean-field (RMF) model is used to describe hadronic matter, while to the represent quark matter, the Nambu–Jona–Lasinio (NJL) model is applied. We explore the strength of vector coupling in quark matter, which delays the onset density of the mixed phase and reduces the size of the mixed-phase core in a hybrid star, but does not exhibit a clear correlation with the central density. In a hybrid star with a maximum mass of approximately 2 solar masses ( $$M_\odot $$ M ⊙ ), a mixed-phase core of $$\sim $$ ∼ 5 km may exist, comprising about $$40\%$$ 40 % of the total radius. However, our results do not support the existence of a sizable quark core containing the mixed phase ( $$R_\mathrm{{MP}}>1/2~R_\mathrm{{total}}$$ R MP > 1 / 2 R total ) for the maximum-mass hybrid star or for a 2 $$M_\odot $$ M ⊙ massive star. |
| format | Article |
| id | doaj-art-d894316aa76e4aedbcb7f5bbc5da2b2f |
| institution | DOAJ |
| issn | 1434-6052 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-d894316aa76e4aedbcb7f5bbc5da2b2f2025-08-20T02:49:35ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522025-03-0185311110.1140/epjc/s10052-025-14088-yThe mixed phase quark core in massive hybrid starsXuhao Wu0Peng-Cheng Chu1Min Ju2He Liu3Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan UniversityScience School, Qingdao University of TechnologySchool of Science, China University of Petroleum (East China)Science School, Qingdao University of TechnologyAbstract We investigate the properties of hybrid star and the mixed phase core to explore the radius ratio of the mixed phase in hybrid star. In the context of observed massive neutron stars (NSs), we examine the internal structure, phase transitions, and the impacts of the equation of state (EOS) in maximum hybrid star. We investigate the stiffness changes in the EOS during the hadron-quark phase transition within the hybrid stars. The relativistic mean-field (RMF) model is used to describe hadronic matter, while to the represent quark matter, the Nambu–Jona–Lasinio (NJL) model is applied. We explore the strength of vector coupling in quark matter, which delays the onset density of the mixed phase and reduces the size of the mixed-phase core in a hybrid star, but does not exhibit a clear correlation with the central density. In a hybrid star with a maximum mass of approximately 2 solar masses ( $$M_\odot $$ M ⊙ ), a mixed-phase core of $$\sim $$ ∼ 5 km may exist, comprising about $$40\%$$ 40 % of the total radius. However, our results do not support the existence of a sizable quark core containing the mixed phase ( $$R_\mathrm{{MP}}>1/2~R_\mathrm{{total}}$$ R MP > 1 / 2 R total ) for the maximum-mass hybrid star or for a 2 $$M_\odot $$ M ⊙ massive star.https://doi.org/10.1140/epjc/s10052-025-14088-y |
| spellingShingle | Xuhao Wu Peng-Cheng Chu Min Ju He Liu The mixed phase quark core in massive hybrid stars European Physical Journal C: Particles and Fields |
| title | The mixed phase quark core in massive hybrid stars |
| title_full | The mixed phase quark core in massive hybrid stars |
| title_fullStr | The mixed phase quark core in massive hybrid stars |
| title_full_unstemmed | The mixed phase quark core in massive hybrid stars |
| title_short | The mixed phase quark core in massive hybrid stars |
| title_sort | mixed phase quark core in massive hybrid stars |
| url | https://doi.org/10.1140/epjc/s10052-025-14088-y |
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