Covariant density functional theory: The role of the pion

Details Covariant density functional theory: The role of the pion Covariant density functional theory: The role of the pion

2009-09-12

arxiv.org/abs/0909.2364v1

Phys.Rev.C80:041301,2009

Physics

Nuclear Physics

Nuclear Theory

12 pages, 5 figures

Scientific paper

10.1103/PhysRevC.80.041301

We investigate the role of the pion in Covariant Density Functional Theory. Starting from conventional Relativistic Mean Field (RMF) theory with a non-linear coupling of the $\sigma$-meson and without exchange terms we add pions with a pseudo-vector 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 non-central contribution of the pion (tensor coupling) does have effects on single particle energies and on binding energies of certain nuclei.

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