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29 March 2024
 
  » arxiv » nucl-th/9702008

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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
AbstractWe 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
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