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Treating Coulomb exchange contributions in relativistic mean field calculations: why and how
The energy density functional (EDF) method is very widely used in nuclear
physics, and among the various existing functionals those based on the
relativistic Hartree (RH) approximation are very popular because the exchange
contributions (Fock terms) are numerically rather onerous to calculate.
Although it is possible to somehow 'mock up' the effects of meson-induced
exchange terms by adjusting the meson-nucleon couplings, the lack of Coulomb
exchange contributions hampers the accuracy of predictions. In this note, we
show that the Coulomb exchange effects can be easily included with a good
accuracy in a perturbative approach. Therefore, it would be desirable for
future relativistic EDF models to incorporate Coulomb exchange effects, at
least to some order of perturbation.Comment: 3 pages, 1 figure, Proceedings of the 20th Nuclear Physics Workshop
"Marie & Pierre Curie", Kazimierz, Poland, 25-29 September, 201
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