Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-08-05
Nucl.Phys. A747 (2005) 268-294
Physics
Nuclear Physics
Nuclear Theory
27 pages, 8 figures, some corrections and clarifications
Scientific paper
10.1016/j.nuclphysa.2004.10.008
This work continues a program to systematically generalize the Skyrme Hartree-Fock method for medium and heavy nuclei by applying effective field theory (EFT) methods to Kohn-Sham density functional theory (DFT). When conventional Kohn-Sham DFT for Coulomb systems is extended beyond the local density approximation, the kinetic energy density tau is sometimes included in energy functionals in addition to the fermion density. However, a local (semi-classical) expansion of tau is used to write the energy as a functional of the density alone, in contrast to the Skyrme approach. The difference is manifested in different single-particle equations, which in the Skyrme case include a spatially varying effective mass. Here we show how to generalize the EFT framework for DFT derived previously to reconcile these approaches. A dilute gas of fermions with short-range interactions confined by an external potential serves as a model system for comparisons and for testing power-counting estimates of new contributions to the energy functional.
Bhattacharyya Anirban
Furnstahl R. J.
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