THE DEPENDENCE OF THE PION DISPERSION-RELATION ON THE SHORT-RANGE CORRELATION

The relativistic Delta h excitation polarization insertion of pion pro pagator is given and its real part is compared with the nonrelativisti c ones, its imaginary part and the pion dispersion relation are studie d by two sets of short-range correlation Landau-Migdal parameter g'. W e find that the imaginary part has large difference for some energies and momenta, the pion dispersion relation shows small difference. The short-range correlation suppresses both the ph and Delta h excitations . The pion dispersion relation at normal nuclear density shows no evid ence for pion condensation. The Delta h polarization insertion and the pion dispersion relation are dependent on the nuclear density and the effective mass of nucleon and a-isobars strongly.