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arXiv 2111.04520nucl-thastro-ph.HEnucl-ex
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我们能破译中子星核心的成分吗?

Can we decipher the composition of the core of a neutron star?

Chiranjib Mondal, Francesca Gulminelli

摘要:

广义相对论保证了多信使天文学可获得的中子星(NS)的静态观测值(如质量半径或潮汐变形)与β平衡物质的状态方程(EoS)之间唯一的一一对应。众所周知,这些静态特性不足以区分传统的NS和混合星。然而,如果假设存在于中子星核中的强子只是中子和质子,那么轻子分数原则上是由化学平衡条件明确决定的。使用一个简单的分析方法的基础上的多项式展开的EoS,我们表明,多个解决方案是可能的β-平衡方程,导致一个特征的不确定性的组成的内部的NS,即使在纯核子假设。我们进一步表明,额外的经验信息对称物质在高密度是不是很有效的牵制的组成,如果测量的不确定性占。我们的结论是,只有在高密度下对对称能的约束,才能对破译中子星核的组成产生有意义的影响。我们的研究结果给出了一个下限的不确定性NS核心组成,可以得到与天体物理和地面实验。

英文摘要:

General relativity guarantees a unique one-to-one correspondence between static observables of neutron stars (NSs) accessible by multi-messenger astronomy, such as mass-radius or tidal deformability, and the equation of state (EoS) of beta equilibrated matter. It is well known that these static properties are not enough to discern conventional NSs from hybrid stars. However, if one assumes that hadrons present in the neutron star core are only neutrons and protons, the lepton fraction is in principle determined unequivocally by the condition of chemical equilibrium. Using a simple analytical method based on a polynomial expansion of the EoS, we show that multiple solutions are possible to the beta-equilibrium equation, leading to a characteristic indetermination on the composition of the interiors of NSs, even in the purely nucleonic hypothesis. We further show that additional empirical information on symmetric matter at high densities are not very efficient to pin down the composition, if uncertainties on measurements are accounted for. We conclude that constraints on the symmetry energy at high densities only, can make meaningful impact to decipher the composition of neutron star core. Our results give a lower limit to the uncertainty on the NS core composition that can be obtained with astrophysical and terrestrial experiments.

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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