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Structure of the Vacuum in Nuclear Matter - A Nonperturbative Approach | A. Mishra
; P.K. Panda
; S. Schramm
; J. Reinhardt
; W. Greiner
; | Date: |
4 Feb 1997 | Journal: | Phys.Rev. C56 (1997) 1380-1388 | Subject: | nucl-th hep-ph | Affiliation: | Institut für Theoretische Physik, J.W. Goethe Universität, Frankfurt am Main, Germany; Gesellschaft für Schwerionenforschung, Darmstadt, Germany | Abstract: | We compute the vacuum polarisation correction to the binding energy of nuclear matter in the Walecka model using a nonperturbative approach. We first study such a contribution as arising from a ground state structure with baryon-antibaryon condensates. This yields the same results as obtained through the relativistic Hartree approximation of summing tadpole diagrams for the baryon propagator. Such a vacuum is then generalized to include quantum effects from meson fields through scalar-meson condensates. The method is applied to study properties of nuclear matter and leads to a softer equation of state giving a lower value of the incompressibility than would be reached without quantum effects. The density dependent effective sigma mass is also calculated including such vacuum polarisation effects. | Source: | arXiv, nucl-th/9702008 | Services: | Forum | Review | PDF | Favorites |
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