Optimized 
expansion for relativistic nuclear models
G. Krein1,2 - R.S. Marques de Carvalho3 - D.P. Menezes3 - M. Nielsen4 - M.B. Pinto3
1 Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany
2 Instituto de Física Teórica, Universidade Estadual Paulista,
Rua Pamplona 145, 01405-900 São Paulo, S.P. Brazil
3 Departamento de Física, Universidade Federal de Santa Catarina, 88.040-900
Florianópolis, S.C., Brazil
4 Instituto de Física, Universidade de São Paulo, Caixa Postal 66318,
5389-970 São Paulo, S.P., Brazil
Received: 17 March 1997 / Revised version: 27 August 1997
Abstract
The optimized -expansion is a nonperturbative approach for
field theoretic models which combines the techniques of perturbation theory and
the variational principle. This technique is discussed in the 
model and then implemented in the Walecka model for the equation of state of
nuclear matter. The results obtained with the expansion are compared with
those obtained with the traditional mean field, relativistic Hartree and
Hartree-Fock approximations.
PACS
21.60.-n Nuclear structure models and methods -
21.65.+f Nuclear matter -
12.38.Lg Other nonperturbative calculations
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