Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-10-29
Phys.Lett. B370 (1996) 5-11
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
10.1016/0370-2693(95)01578-7
The optimized $\delta$-expansion is used to study vacuum polarization effects in the Walecka model. The optimized $\delta$-expansion is a nonperturbative approach for field theoretic models which combines the techniques of perturbation theory and the variational principle. Vacuum effects on self-energies and the energy density of nuclear matter are studied up to ${\cal O}(\delta^2)$. When exchange diagrams are neglected, the traditional Relativistic Hartree Approximation (RHA) results are exactly reproduced and, using the same set of parameters that saturate nuclear matter in the RHA, a new stable, tightly bound state at high density is found.
Krein Gastao
Menezes Débora P.
Pinto Marcus Benghi
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