Covariant density functional theory: The role of the pion
Covariant density functional theory: The role of the pion
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DOI：
10.1103/physrevc.80.041301
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发表时间：
2009-09
影响因子：
3.1
通讯作者：
G. Lalazissis;S. Karatzikos;M. Serra;T. Otsuka;P. Ring
中科院分区：
文献类型：
--
作者：
G. Lalazissis;S. Karatzikos;M. Serra;T. Otsuka;P. Ring
我们研究了π介子在协变密度泛函理论中的作用。从传统的相对论平均场（RMF）理论出发，考虑了介子的非线性耦合，在相对论Hartree-Fock近似下，在核子中加入了具有赝矢量耦合的π介子.为了考虑π介子场在核介质中的变化，将π介子的有效耦合常数作为自由参数处理。结果发现，这种密度泛函中包含π介子并不破坏RMF对体性质的整体描述。另一方面，π介子的非中心贡献（张量耦合）确实对单粒子能量和某些原子核的结合能有影响。
We investigate the role of the pion in covariant density functional theory. Starting from conventional relativistic mean field (RMF) theory with a nonlinear coupling of the $\ensuremath{\sigma}$ meson and without exchange terms we add pions with a pseudovector coupling to the nucleons in relativistic Hartree-Fock approximation. In order to take into account the change of the pion field in the nuclear medium the effective coupling constant of the pion is treated as a free parameter. It is found that the inclusion of the pion to this sort of density functionals does not destroy the overall description of the bulk properties by RMF. On the other hand, the noncentral contribution of the pion (tensor coupling) does have effects on single particle energies and on binding energies of certain nuclei.