Coupled-cluster studies of infinite nuclear matter
Coupled-cluster studies of infinite nuclear matter
复制标题
无限核物质的耦合团簇研究
DOI：
10.1103/physrevc.88.054312
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
Morten Hjorth
中科院分区：
文献类型：
--
作者：
G. Baardsen;Andreas Ekström;Gaute Hagen;Morten Hjorth
这项工作的目的是发展相关的公式来执行核物质和中子星物质的耦合团簇(CC)计算，从而包括在基于手征有效场理论的相互作用和测试现代核力中的无穷级的重要关联。我们的形式包括在状态方程的分波展开中对所谓的泡利算符的精确处理。核物质和中子物质的计算是使用粒子-粒子耦合和空穴-空穴阶梯近似进行的。耦合梯形方程是CC理论的一种近似形式，从CC倍增振幅方程中省去了粒子-空穴和非线性图。这项研究是迈向核物质和中子物质CC计算的第一步。我们用基于手征有效场理论的最新核子-核子相互作用，给出了对称核物质和纯中子物质的结果。我们还利用新优化的手征相互作用[A.Ekstr\“om et al.，Phys.Rev.Lett.110,192502(2013年)]研究了无限核物质，并将梯形近似方法和相应的结果与传统的Brueckner-Hartree-Fock理论进行了比较。
The aim of this work is to develop the relevant formalism for performing coupled-cluster (CC) calculations in nuclear matter and neutron star matter, including thereby important correlations to infinite order in the interaction and testing modern nuclear forces based on chiral effective field theory. Our formalism includes the exact treatment of the so-called Pauli operator in a partial wave expansion of the equation of state. Nuclear and neutron matter calculations are done using a coupled particle-particle and hole-hole ladder approximation. The coupled ladder equations are derived as an approximation of CC theory, leaving out particle-hole and non-linear diagrams from the CC doubles amplitude equation. This study is a first step toward CC calculations for nuclear and neutron matter. We present results for both symmetric nuclear matter and pure neutron matter employing state-of-the-art nucleon-nucleon interactions based on chiral effective field theory. We employ also the newly optimized chiral interaction [A. Ekstr\"om et al., Phys. Rev. Lett. 110, 192502 (2013)] to study infinite nuclear matter. The ladder approximation method and corresponding results are compared with conventional Brueckner-Hartree-Fock theory.