Hybrid stars can be self-bound

作     者：Li-Qun Su Chao Shi Yong-Feng Huang Yan Yan Cheng-Ming Li Hongshi Zong 

作者机构：Department of physics Nanjing University Nanjing 210093 China Department of Nuclear Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China School of Astronomy and space science Nanjing University Nanjing 210023 China School of Mathematics and physics Changzhou University Changzhou 213164 China School of physics and Microelectronics Zhengzhou University Zhengzhou 450001 China Department of physics Anhui Normal University Wuhu 241000 China Nanjing Proton Source Research and Design Center Nanjing 210093 China Joint Center for Particle Nuclear Physics and Cosmology Nanjing 210093 China 

出 版 物：《Physical Review D》 (Phy. Rev. D)

年 卷 期：2021年第103卷第9期

页      面：094037-094037页

核心收录：

基　　金：Nation Major State Basic Research and Development of China, (2016YFE0129300) National Square Kilometer Array Program of China, (2020SKA0120300) National Natural Science Foundation of China, NSFC, (11475085, 11535005, 11690030, 11873030, 11905104, 12041306, U1938201) National Natural Science Foundation of China, NSFC Chinese Academy of Sciences, CAS, (XDB23040000) Chinese Academy of Sciences, CAS 

主　　题：Nuclear matter in neutron stars Strong interaction 

摘      要：Based on the properties of uniform nuclear matter at the nuclear saturation density and basic thermodynamic relations, we first restudy the composition of matter on the surface of normal neutron stars and hybrid stars. It is found that hybrid stars are composed of uniform hadronic matter on the surface rather than heavy nuclei. Then we use the Walecka model and the self-consistent NJL model to describe the equation of state of low-density hadrons and quark matter at high densities respectively. 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 requirements of 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.