Publicação: Optimized δ expansion for the Walecka model
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1996-03-07
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Elsevier B.V.
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The optimized δ-expansion is used to study vacuum polarization effects in the Walecka model. The optimized δ-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 script O sign(δ2). 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.
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Physics Letters B. Amsterdam: Elsevier B.V., v. 370, n. 1-2, p. 5-11, 1996.
