Particle vibrational coupling in covariant density functional theory

Abstract

A consistent combination of covariant density functional theory (CDFT) and Landau-Migdal Theory of Finite Fermi Systems (TFFS) is presented. Both methods are in principle exact, but Landau-Migdal theory cannot describe ground state properties and density functional theory does not take into account the energy dependence of the self-energy and therefore fails to yield proper single-% particle spectra as well as the coupling to complex configurations in the width of giant resonances. Starting from an energy functional, phonons and their vertices are calculated without any further parameters. They form the basis of particle-vibrational coupling leading to an energy dependence of the self-energy and an induced energy-dependent interaction in the response equation. A subtraction procedure avoids double counting. Applications in doubly magic nuclei and in a chain of superfluid nuclei show excellent agreement with experimental data.

34 pages, 8 figures; in the version 2, the Acknowledgment has been added

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• Well funneled nuclear structure landscape: renormalization
• Relativistic description of magnetic moments in nuclei with doubly closed shells plus or minus one nucleon
• The quest for novel modes of excitation in exotic nuclei
• Unified description of structure and reactions: implementing the Nuclear Field Theory program