论文标题
通过改善中子星形的建模
Towards mitigation of apparent tension between nuclear physics and astrophysical observations by improved modeling of neutron star matter
论文作者
论文摘要
Ligo-Virgo和更好合作的中子星（NSS）的观察提供了对其各种宏观特性的合理精确测量。在本文中，我们采用贝叶斯框架将它们结合起来，并在NS状态方程（EOS）的特性上放置了改进的关节约束。我们使用混合EOS公式，该公式采用抛物线膨胀的核经验参数化围绕核饱和度密度增强，该密度通过较高密度的通用3段分段多质模型增强。在$ 90 \％$可信的水平中，此参数化此参数化预测$ r_ {1.4} = 12.57 _ { - 0.92}^{+0.73} $ km和$λ_{1.4} = 550 _ { - { - 225}^{+223} $ 1.+1. 1. 1. 1. 1. 1. 1. 1. 1. 1. $ 1. 1. m _ {\ odot} $ ns。最后，我们展示了仅基于饱和密度下的核经验参数的完整NS EOS的构建如何导致天体物理数据的一定张力，以及混合方法如何为其提供分辨率。
Observations of neutron stars (NSs) by the LIGO-Virgo and NICER collaborations have provided reasonably precise measurements of their various macroscopic properties. In this paper, we employ a Bayesian framework to combine them and place improved joint constraints on the properties of NS equation of state (EoS). We use a hybrid EoS formulation that employs a parabolic expansion-based nuclear empirical parameterization around the nuclear saturation density augmented by a generic 3-segment piecewise polytrope model at higher densities. Within the $90 \%$ credible level this parameterization predicts $R_{1.4} = 12.57_{-0.92}^{+0.73}$ km and $Λ_{1.4} = 550_{-225}^{+223}$ for the radius and dimensionless tidal deformability, respectively, of a $1.4 M_{\odot}$ NS. Finally, we show how the construction of the full NS EoS based solely on the nuclear empirical parameters at saturation density leads to certain tension with the astrophysical data, and how the hybrid approach provides a resolution to it.
