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arXiv 2108.09113nucl-thastro-ph.HE
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密度相关相对论平均场模型中超电离的中子星形变

Neutron star deformability with hyperonization in density-dependent relativistic mean-field models

W. Z. Shangguan, Z. Q. Huang, S. N. Wei, W. Z. Jiang

摘要:

从引力波数据中提取的中子星潮汐形变量为中子星内部结构及其相关的核物质状态方程提供了一种新的探索途径。在相对论平均场方法中,我们考虑了超子,而不是一般的中子星中的核子和轻子的组成,并在密度依赖的参数化下研究了超子在潮汐形变中的作用及其对对称能的影响.超子对中子星的变形性有显著影响,并与中子星中超子的起始密度和分数有着敏感的相关性。适度降低超子的起始密度可以对潮汐变形性产生相当大的修改,并改变其对核物态方程的推断。未来对多基准恒星质量潮汐形变的测量有望提升超子分量和对称能贡献之间的简并度。

英文摘要:

Neutron star tidal deformability extracted from gravitational wave data provides a novel probe to the interior neutron star structures and the associated nuclear equation of state (EOS). Instead of the popular composition of nucleons and leptons in neutron stars, we include hyperons and examine the role of hyperons in the tidal deformability and its impact on the symmetry energy in a relativistic mean-field approach with the density-dependent parametrizations. The hyperons are found to have significant impact on the deformability, correlated sensitively with the onset density and fraction of hyperons in neutron star matter. Moderately lower onset density of hyperons can yield considerable modification to the tidal deformability and shift its inference on the nuclear EOS. The future measurements of the tidal deformability at multi-fiducial star masses are anticipated to lift the degeneracy between the contributions from the hyperon component and symmetry energy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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