混合恒星可以自我约束
Hybrid stars can be self-bound
摘要：
基于均匀核物质在核饱和密度下的性质和基本热力学关系，我们首次重新研究了正常中子星和混合星表面的物质组成。发现混合星是由表面均匀的强子物质组成，而不是由重核组成。然后分别用Walceka模型和自洽NJL模型描述高密度下的低密度强子和夸克物质的物态方程，用P插值方法连接极端密度下的物态方程，研究混合星。结果表明，所得到的混合星质量半径关系和潮汐形变量与最新的天文观测数据相吻合。更重要的是，我们发现我们得到的混合星可以是自束缚的，而不是引力束缚的，这与以往的相关研究完全不同。
英文摘要：
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.
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