Covariant density functional theory with localized exchange terms
Qiang Zhao, Z. X. Ren, P. W. Zhao, Jie Meng
Abstract
The authors derive a new density-dependent point-coupling covariant density functional (PCF-PK1) with exchange terms that are local and can be included in a standard relativistic mean-field calculation. This saves a considerable amount of computing time over relativistic Hartree-Fock calculations with nonlocal potentials. The PCF-PK1 is obtained by fitting nuclear matter and finite nuclei, including the results of $a\phantom{\rule{0}{0ex}}b$-$i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations; it eliminates spurious shell closures at $Z=58$ and 92; and it accurately reproduces Gamow-Teller resonances in closed-shell nuclei. This new covariant density functional PCF-PK1 with exchange correlation is expected to provide a unified and consistent description for both nuclear ground states and excited states, in particular for unstable nuclei far from stability.