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The European Physical Journal A
ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)
Abstract Volume 1 Issue 1 (1998) pp 45-53
Optimized <delta> expansion for relativistic nuclear models
G. Krein (1)(2), R.S. Marques de Carvalho (3), D.P. Menezes (3), M. Nielsen (4), M.B. Pinto (3) (*)
(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 <delta>-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 <lambda><phi>4 model and then implemented in the Walecka model for the equation of state of nuclear matter. The results obtained with the <delta> 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
(*) Alexander von Humboldt research fellow
Communicated by W. Weise
Online publication: January 23, 1998
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