Structure of the Vacuum in Nuclear Matter - A Nonperturbative Approach

Details Structure of the Vacuum in Nuclear Matter - A Nonperturbative Approach Structure of the Vacuum in Nuclear Matter - A Nonperturbative Approach

1997-02-04

arxiv.org/abs/nucl-th/9702008v1

Phys.Rev.C56:1380-1388,1997

Physics

Nuclear Physics

Nuclear Theory

26 pages including 5 eps files, uses revtex style; PACS number: 21.65.+f,21.30.+y

Scientific paper

10.1103/PhysRevC.56.1380

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.

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