Density dependent hadron field theory
- Sektion Physik, Universitaet Muenchen, Am Coulombwall 1, D-85748 Garching (Germany)
A fully covariant approach to a density dependent hadron field theory is presented. The relation between in-medium {ital NN} interactions and field-theoretical meson-nucleon vertices is discussed. The medium dependence of nuclear interactions is described by a functional dependence of the meson-nucleon vertices on the baryon field operators. As a consequence, the Euler-Lagrange equations lead to baryon rearrangement self-energies which are not obtained when only a parametric dependence of the vertices on the density is assumed. It is shown that the approach is energy-momentum conserving and thermodynamically consistent. Solutions of the field equations are studied in the mean-field approximation. Descriptions of the medium dependence in terms of the baryon scalar and vector density are investigated. Applications to infinite nuclear matter and finite nuclei are discussed. Density dependent coupling constants obtained from Dirac-Brueckner calculations with the Bonn {ital NN} potentials are used. Results from Hartree calculations for energy spectra, binding energies, and charge density distributions of {sup 16}O, {sup 40,48}Ca, and {sup 208}Pb are presented. Comparisons to data strongly support the importance of rearrangement in a relativistic density dependent field theory. Most striking is the simultaneous improvement of charge radii, charge densities, and binding energies. The results indicate the appearance of a new ``Coester line`` in the nuclear matter equation of state.
- OSTI ID:
- 132937
- Journal Information:
- Physical Review, C, Vol. 52, Issue 6; Other Information: PBD: Dec 1995
- Country of Publication:
- United States
- Language:
- English
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