论文标题
通过手性NN和3N相互作用的不对称 - 核对称能量的限制
Constraints on the nuclear symmetry energy from asymmetric-matter calculations with chiral NN and 3N interactions
论文作者
论文摘要
核对称能是核（Astro）物理学的关键量。它描述了状态核方程（EOS）的同胞依赖性，通常认为这几乎是二次。在这项工作中，我们基于一组常见的汉密尔顿人，包括来自手性有效野外理论的一组常见的汉密尔顿人，以明确的不对称核肌肉计算来面对EOS的标准二次扩展。我们特别研究了非二次贡献对对称能量的重要性，包括Kaiser [Phys。〜C \ C \ C \ Textbf {91}，065201（2015）引入的非分析对数术语]。我们的结果表明，可以从所使用的各种哈密顿人中确定对对称能的四分之一贡献，并且我们在饱和密度下获得1.00（8）MEV（或潜在部分的0.55（8）MeV），而对对称能量的对数贡献相对小，并且相对较小，并且依赖于模型。我们最终采用了元模型方法来研究高阶贡献对中子星形甲壳核过渡密度的影响，并找到一个较小的5 \％校正。
The nuclear symmetry energy is a key quantity in nuclear (astro)physics. It describes the isospin dependence of the nuclear equation of state (EOS), which is commonly assumed to be almost quadratic. In this work, we confront this standard quadratic expansion of the EOS with explicit asymmetric nuclear-matter calculations based on a set of commonly used Hamiltonians including two- and three-nucleon forces derived from chiral effective field theory. We study, in particular, the importance of non-quadratic contributions to the symmetry energy, including the non-analytic logarithmic term introduced by Kaiser [Phys.~Rev.~C \textbf{91}, 065201 (2015)]. Our results suggest that the quartic contribution to the symmetry energy can be robustly determined from the various Hamiltonians employed, and we obtain 1.00(8) MeV (or 0.55(8) MeV for the potential part) at saturation density, while the logarithmic contribution to the symmetry energy is relatively small and model-dependent. We finally employ the meta-model approach to study the impact of the higher-order contributions on the neutron-star crust-core transition density, and find a small 5\% correction.
