The δ expansion and the principle of minimal sensitivity
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Data
1998-03-01
Autores
Krein, G. [UNESP]
Menezes, D. P.
Nielsen, M.
Pinto, M. B.
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The δ-expansion is a nonperturbative approach for field theoretic models which combines the techniques of perturbation theory and the variational principle. Different ways of implementing the principle of minimal sensitivity to the δ-expansion produce in general different results for observables. For illustration we use the Nambu-Jona-Lasinio model for chiral symmetry restoration at finite density and compare results with those obtained with the Hartree-Fock approximation.
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Brazilian Journal of Physics, v. 28, n. 1, p. 66-71, 1998.