1/N expansion and the correlation energy of nuclear matter in the relativistic σω model

摘要: Abstract We propose the 1/ N expansion method, where can be identified with 2 due to isospin SU(2), as a systematic scheme for relativistic meson-nucleon many-body theory. derive general formula computation of effective action in σω model based on expansion, utilizing functional integral method. In this leading contribution coincides familiar Hartree approximation. The elimination Landau ghost from meson propagators subgraphs, which appears essential our formulation, is also established. As an application we compute energy density nuclear matter beyond approximation including next-to-leading order contributions expansion. order, one should include ring correlation addition exchange contribution. find that describe saturation properties without drastic changes overall physical picture emerged important role repulsive vacuum polarization effects emphasized.