Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-01-27
Commun.Theor.Phys.32:567-574,1999
Physics
Nuclear Physics
Nuclear Theory
14 pages, 6 eps file, Latex; Talk at the Symposium of the Thermo Field Dynamics and its application, May 5-8, CCAST, Beijing,
Scientific paper
The recent progress on the study of the collective excitation in relativistic nuclear matter is reviewed. The collective excitation modes are derived by meson propagators in nuclear matter. The mesons we study are $\sigma, \omega, \gamma$ and $\pi$ mesons. For pion, we derived not only the relativistic particle - hole, delta - hole excitations but also antiparticle excitations, such as particle - antiparticle, antidelta - particle, delta - antiparticle excitations. By calculating the dispersion relation and the spin - isospin dependent response function, the effects of all these excitation are studied.
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