论文标题
中子恒星中若恩分数和密度曲线的约束
Constraints on the muon fraction and density profile in neutron stars
论文作者
论文摘要
中子恒星（NSS）中的兆恩在解决与检测以及理解哑态暗物质颗粒的相互作用和天体物理效应相关的几个有趣的新物理问题方面发挥了尤其重要的作用。研究后者的关键模型输入是ns质量$ $ m _ {\ rm ns} $上的总元质量$m_μ$，muon质量分数$m_μ/m _ {\ rm ns} $，以及muon radial radial密度profile $ρ_μ（r）$ρ_μ（r）$ρ_μ（r）$ρ_μ（r）$。我们在最低模型中使用了由中子，质子，电子和MUON组成的最小模型，该模型使用可用的核实验室实验和最新的NS质量，radii和Tidal Deformantions的最新天文学观察的状态（EOS）的状态方程（EOS）明确的状态参数方程（EOS）。我们发现，在因果关系允许的最大的NS中，绝对最大的MUON质量$m_μ$及其质量分数$m_μ/m _ {\ rm ns} $分别为0.025 $ m_ \ odot $和1.1 \％。对于到目前为止观察到的最大质量2.14 $ m_ \ odot $，它们分别减少到约0.020 $ m_ \ odot $和0.9 \％。我们还研究了描述高密度中子核仁物质EO的单个参数的各自影响对质量不同的NSS中的MUON含量的影响。我们发现，用于确定NSS中元素含量的最重要但不确定的核物理成分是高密度的核对称能。
Muons in neutron stars (NSs) play especially important roles in addressing several interesting new physics questions associated with detecting as well as understanding interactions and astrophysical effects of muonphilic dark matter particles. The key model inputs for studying the latter are the total muon mass $M_μ$, the muon mass fraction $M_μ/M_{\rm NS}$ over the NS mass $M_{\rm NS}$ and the muon radial density profile $ρ_μ(r)$ in NSs of varying masses. We investigate these quantities within a minimum model for the core of NSs consisting of neutrons, protons, electrons, and muons using an explicitly isospin-dependent parametric Equation of State (EOS) constrained by available nuclear laboratory experiments and the latest astrophysical observations of NS masses, radii and tidal deformabilities. We found that the absolutely maximum muon mass $M_μ$ and its mass fraction $M_μ/M_{\rm NS}$ in the most massive NSs allowed by causality are about 0.025 $M_\odot$ and 1.1\%, respectively. For the most massive NS of mass 2.14 $M_\odot$ observed so far, they reduce to about 0.020 $M_\odot$ and 0.9\%, respectively. We also study respective effects of individual parameters describing the EOS of high-density neutron-rich nucleonic matter on the muon contents in NSs with varying masses. We found that the most important but uncertain nuclear physics ingredient for determining the muon contents in NSs is the high-density nuclear symmetry energy.
