Neutron Star Radii, Deformabilities, and Moments of Inertia from Experimental and Ab Initio Theory Constraints of the 208Pb Neutron Skin Thickness
Neutron Star Radii, Deformabilities, and Moments of Inertia from Experimental and Ab Initio Theory Constraints of the 208Pb Neutron Skin Thickness
复制标题
DOI：
10.3390/galaxies10050099
复制
发表时间：
2022-04
期刊：
影响因子：
2.5
通讯作者：
Y. Lim;J. Holt
中科院分区：
文献类型：
--
作者：
Y. Lim;J. Holt
最近的实验和从头算理论研究的208铅中子皮厚度有可能告知中子星星状态方程。特别是，208 Pb中子皮厚度和正常核密度下中子物质压力之间的强相关性导致了对典型1.4 M中子星的半径、潮汐形变和惯性矩的修正预测。在目前的工作中，我们研究的相对影响，这些最近的分析208铅中子皮厚度的中子星的整体性质内的贝叶斯统计分析。为了突出高度不确定的高密度状态方程的作用，采用了两种模型的状态方程先验。从我们对核理论、核实验和稠密物质状态方程的观测约束的贝叶斯分析中，我们发现，在90%的可信度水平上，半径为1.4 M的中子星星的R1.4=12.36−0.73+0.38 km，半径为2.0 M的中子星星的R2.0=11.96−0.71+0.94 km，1.4 M中子星星的潮汐形变能为Λ 1.4=440−144+103，质量为1.338 M的PSR J 0737 - 3039 A的转动惯量为I 1.338 =1.425−0.146+0.074× 1045 gcm 2。
Recent experimental and ab initio theory investigations of the 208Pb neutron skin thickness have the potential to inform the neutron star equation of state. In particular, the strong correlation between the 208Pb neutron skin thickness and the pressure of neutron matter at normal nuclear densities leads to modified predictions for the radii, tidal deformabilities, and moments of inertia of typical 1.4M⊙ neutron stars. In the present work, we study the relative impact of these recent analyses of the 208Pb neutron skin thickness on bulk properties of neutron stars within a Bayesian statistical analysis. Two models for the equation of state prior are employed in order to highlight the role of the highly uncertain high-density equation of state. From our combined Bayesian analysis of nuclear theory, nuclear experiment, and observational constraints on the dense matter equation of state, we find at the 90% credibility level R1.4=12.36−0.73+0.38 km for the radius of a 1.4M⊙ neutron star, R2.0=11.96−0.71+0.94 km for the radius of a 2.0M⊙ neutron star, Λ1.4=440−144+103 for the tidal deformability of a 1.4M⊙ neutron star, and I1.338=1.425−0.146+0.074×1045gcm2 for the moment of inertia of PSR J0737-3039A whose mass is 1.338M⊙.