EOS AND FERMI-LIQUID PROPERTIES IN THE 1 N EXPANSION OF A RELATIVISTIC MANY-BODY THEORY/

The equation of state (EOS) for cold nuclear and neutron matter is inv estigated in the framework of relativistic meson-nucleon theory employ ing the 1/N expansion scheme. It is found that the inclusion of the re lativistic Fock and correlation energies leads to a softening of the E OS, bringing the results closer to the empirical body of information o n the state of matter at high densities. The resulting properties of q uasiparticles are investigated using methods of the Landau-Migdal theo ry. As applications, neutron-star structure and collective excitations in infinite nuclear matter are discussed.