Bulg. J. Phys. vol.46 no.4 (2019), pp. 281-291

Correlations Beyond Mean Field Based on Covariant Density Functional Theory

P. Ring1,2
1Physics Department, Technical University Munich, 85748 Garching, Germany
2School of Physics, Peking University, 100871 Beijing, China
Abstract. The concept of Density Functional Theory (DFT) is a mapping of the complicated quantum mechanical many-body problem to a one-body problem, which can be solved relatively easily. Correlations are taken into account by the violation of symmetries. There are, however, cases, where this mechanism is not sufficient, and where one has to go beyond mean field. There are extensions of nuclear density functional theory which start from successful phenomenological nuclear density functionals and allow, without new parameters, the mixing of configurations and the description of excited states. We give an overview of such methods for covariant density functional theory and discuss a number of recent applications, such as the treatment of complex spectra in transitional nuclei or the coupling of single particle motion to collective phonons.

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