论文标题
依赖密度依赖性的中子中子中子与均衡性手性的三中音力相互作用
Density-Dependent Neutron-Neutron Interaction from Subleading Chiral Three-Neutron Forces
论文作者
论文摘要
三核力力是准确描述核少数和多体系统的必要成分。但是,在技术上直接实施它们在技术上非常具有挑战性。因此,需要有效的近似方法。通过将一个核子线关闭到循环,可以得出有效的中等核子内核子相互作用,代表了基础的三核力力,如手性有效场理论所构建的那样。由于三个中子力对于纯中子物质的状态方程式同样重要,因此这项工作将上述方法应用于统一的手性三个中子力,尤其是短期术语和相对论纠正。在这项工作中表明,尽管对中子内中子中的中子相互作用的许多贡献与恒定因素相同,但与isospin-Memmetric-Memmetric Matter中的术语相同,但有些与术语相同。此外,以前消失的条款现在产生的非零贡献。这项工作的结果是,密度依赖性中子内中子潜能现在可以用于核多体计算中的实施,无论是以封闭的分析形式,或最多需要一种数值整合。
Three-nucleon forces are an essential ingredient for an accurate description of nuclear few- and many-body systems. However, implementing them directly in many-body calculations is technically very challenging. Thus, there is a need for an efficient approximation method. By closing one nucleon line to a loop, it is possible to derive effective in-medium nucleon-nucleon interactions that represent the underlying three-nucleon forces, as constructed in Chiral Effective Field Theory. Since three-neutron forces are equally as important for the computation of the equation of state for pure neutron matter, this work applies the aforementioned approach to the subleading chiral three-neutron forces, in particular the short-range terms and relativistic corrections. It is shown in this work that, while many contributions to the in-medium neutron-neutron interaction are - apart from a constant factor - identical to the terms in isospin-symmetric matter, some differ drastically. Moreover, previously vanishing terms yield now non-zero contributions. As a result of this work, density-dependent in-medium neutron-neutron potentials are now available for the implementation in nuclear many-body calculations, either in closed analytical form, or requiring at most one numerical integration.