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It is shown that the off-shell parameters in the interaction Lagrangian of pions, nucleons, and Δ-isobars are redundant in the framework of effective field theories. Our results also suggest the necessity of including the Δ as an explicit dynamical degree of freedom.
An analysis of nuclear properties based on a relativistic energy functional containing Dirac nucleons and classical scalar and vector meson fields is discussed. Density functional theory implies that this energy functional can include many-body effects that go beyond the simple Hartree approximation. Using basic ideas from effective field theory, a systematic truncation scheme is developed for the...
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