THE BINDING-ENERGY OF NUCLEAR-MATTER WITH PIONIC DEGREE-OF-FREEDOM

The renormalization of pion exchange nucleon self-energy in nuclear ma tter is made by dispersion relation. The exchange and correlation ener gies (in the ring approximation) of pion, sigma and omega mesons, are derived and used to calculate the binding energy of nuclear matter at zero temperature. We find that sigma, omega and pi mesons cannot satur ate the binding energy of nuclear matter in the relativistic RPA appro ximation, but the saturation can be achieved by making a density-depen dent correction to the sigma NN, omega NN coupling constants. We also verify that the binding energy can saturate in the relativistic Hartre e approximation plus the exchange and correlation energies of pi meson .