相对论Hartree-Fock理论中的核物质对称能  

Symmetry energy of nuclear matter in relativistic Hartree-Fock theory

作　　者：孙保元[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《中国科学：物理学、力学、天文学》2016年第1期189-203,共15页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:11205075;11375076);高等学校博士学科点专项科研基金新教师类资助课题(编号:20120211120002)资助项目

摘　　要：文章回顾了利用相对论Hartree-Fock理论研究核物质对称能的一些相关工作.首先简要介绍了新发展的密度依赖的相对论Hartree-Fock理论描述核物质体系的理论框架.随后从三个方面总结了相对论Hartree-Fock理论中的对称能物理,包括交换项对增强对称能的密度依赖性所起的作用,超子引起的交换项效应对于对称能的额外软化作用,以及提取对称能中的自洽张量力效应等.最后,讨论了通过约束对称能的密度依赖行为改进理论模型的一点建议.Several topics on the symmetry energy of nuclear matter in relativistic Hartree-Fock theory are reviewed. General for- mulism of the newly developed density-dependent relativistic Hartree-Fock theory for hadronic matter is presented briefly. The effects of Fock terms on the nuclear symmetry energy are reviewed in detail from three aspects： the extra enhancement from the Fock terms of the isoscalar meson-nucleon coupling channels, the extra hyperon-induced suppression effect orig- inating from the Fock channel, self-consistent tensor effects embedded automatically in the Fock diagrams. The naturally involved tensor force components in the Fock diagrams soften the density-dependent behavior of the symmetry energy and consequently lead neutron stars to be more compact. Finally, the error estimates of theoretical models are performed by doing a variation procedure, and possible ways to improve the relativistic Hartree-Fock models are discussed.

关 键 词：对称能 协变密度泛函理论 交换项 张量力 超子 

分 类 号：O571[理学—粒子物理与原子核物理]