Relativistic Particle-Hole and Delta-Hole Excitations for Pion Propagator in Nuclear Matter |
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Authors: | Liang-Gang LIU W H MA H C CHIANG |
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Institution: | 1. Department of Physics, Zhongshan University, Guangzhou 510275, China;
2. Institute of High Energy Physics, Academia Sinica, Beijing 100039, China |
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Abstract: | The relativistic particle-hole and delta-hole polarization insertions for pion propagator are calculated by using particle-hole-antiparticle representation of nucleon and delta propagators in nuclear matter. The short-range correlations between nucleon-nucleon, nucleon-delta and delta-delta are included via Landau-Migdal parameter g' in the random phase approximation. We calculate the dispersion relations for pions and find out that the damped pion condensation is removed by the short-range correlation and there is a long gap in the dispersion relation. |
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