论文标题
中子恒星中的超核子三体力和陌生感
Hyperon-nucleon three-body forces and strangeness in neutron stars
论文作者
论文摘要
研究了在核培养基中作用于$λ$ Hyperon的三体力，特别关注中子星中所谓的超子拼图。 SU（3）手性有效野外理论的超声核子两体相互作用在近代领先的顺序下采用。使用饱和度通过解剖重子来近似核子三体力，并将其转录为密度依赖性有效的两体相互作用。这些共同将这些作为在Brueckner-Bethe-goldstone方程中的输入，并具有明确处理$λn\leftrightArrowσn$和$λnn\leftrightArrowσnn$耦合通道。计算了$λ$超子在对称核物质和中子物质上的单粒子电位。借助$λNN$三体力的参数受到超核现象学约束的约束，进行了向高巴属密度的外推。通过比较中子恒星核心的密度特征的$λ$和中子化学电位，发现两体和三体相关的组合排斥作用使中子恒星中的$λ$ hyperons的外观在能量上不利，因此为长期存在的问题提供了可能的解决方案。
Three-body forces acting on a $Λ$ hyperon in a nuclear medium are investigated, with special focus on the so-called hyperon puzzle in neutron stars. The hyperon-nucleon two-body interaction deduced from SU(3) chiral effective field theory is employed at next-to-leading order. Hyperon-nucleon three-body forces are approximated using saturation by decuplet baryons and are transcribed to density-dependent effective two-body interactions. These together are taken as input in a Brueckner-Bethe-Goldstone equation with explicit treatment of the $ΛN\leftrightarrowΣN$ and $ΛNN\leftrightarrowΣNN$ coupled channels. Single-particle potentials of a $Λ$ hyperon in symmetric nuclear matter and neutron matter are calculated. With parameters of the $ΛNN$ three-body force constrained by hypernuclear phenomenology, extrapolations to high baryon density are performed. By comparison of the $Λ$ and neutron chemical potentials at densities characteristic of the core of neutron stars it is found that the combined repulsive effects of two- and three-body correlations makes the appearance of $Λ$ hyperons in neutron stars energetically unfavourable, thus offering a possible solution to a longstanding question.
