Equation of state for neutron-rich matter with self-consistent Green function approach

The properties of asymmetric nuclear matter have been investigated in the framework of the self-consistent Green function approach at zero temperature. Results of the total energy per nucleon as a function of the density and asymmetry parameter are presented for two modern realistic nucleon-nucleon interactions: Nijmegen II and CD-Bonn. For comparison purposes, the same calculations are performed for Brueckner-Hartree-Fock approximation. Also we have compared our results with the predictions of other theoretical models especially the Dirac-Brueckner-Hartree-Fock approach. The self-consistent Green's function approach leads to a stiffer equation of state as compared to the Brueckner-Hartree-Fock approximation. This effect increases with density. (C) 2007 Elsevier B.V. All rights reserved.