Collective modes in a relativistic meson-nucleon system

K. Lim, C. J. Horowitz

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Collective modes in a relativistic meson-nucleon system are investigated. The baryon ground state is treated in a mean-field approximation while the meson propagators are described with a relativistic random-phase approximation. Three types of collective modes are found: zero-sound, meson-branch modes, and modes which indicate an instability of the mean-field theory ground state. The mixing of scalar and vector mesons prevents the propagation of zero-sound at saturation density. This is in sharp contrast to nonrelativistic models which often have zero-sound. There is also important mixing between meson and nucleon-antinucleon excitations which greatly effect meson branch modes.

Original languageEnglish
Pages (from-to)729-750
Number of pages22
JournalNuclear Physics A
Issue number4
StatePublished - 2 Oct 1989
Externally publishedYes


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