Optimized delta expansion for the Walecka model

被引:23
作者
Krein, G
Menezes, DP
Pinto, MB
机构
[1] UNIV FED SANTA CATARINA, DEPT FIS, BR-88040900 FLORIANOPOLIS, SC, BRAZIL
[2] UNIV MONTPELLIER 2, PHYS MATH LAB, CNRS, URA 768, F-34095 MONTPELLIER 05, FRANCE
基金
巴西圣保罗研究基金会;
关键词
relativistic nuclear models; nuclear matter; nonperturbative field theory;
D O I
10.1016/0370-2693(95)01578-7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 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.
引用
收藏
页码:5 / 11
页数:7
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