Anchor-based optimization of energy density functionals

A new anchor-based optimization method of defining the energy density functionals (EDFs)

is proposed in [1]. In this approach, the optimization of the parameters of EDF is carried out for

the selected set of spherical anchor nuclei the physical observables of which are modified by

the correction function which takes into account the global performance of EDF. It is shown

that the use of this approach leads to a substantial improvement in global description of binding

energies for several classes of covariant EDFs. For example, the root-mean square deviations

between calculated and experimental binding energies decreases for covariant EDFs with density

dependence of meson exchange from around 2.5 MeV to 1.6 MeV at the mean field level. The

computational cost of defining a new functional within this approach is drastically lower as compared

with the one which includes the global experimental data on spherical, transitional and deformed

nuclei into the fitting protocol and employes computer codes for deformed nuclei in the optimization.

Additional studies of this approach are in progress and the results will be presented and published [2].