Artículos de revistas
Optimized delta expansion for relativistic nuclear models: Renormalization of vacuum fluctuations
Fecha
2000-06-01Registro en:
International Journal of Modern Physics E, v. 9, n. 3, p. 221-247, 2000.
0218-3013
10.1142/S0218301300000131
WOS:000088668500003
2-s2.0-0034402994
Autor
Universidade Federal de Santa Catarina (UFSC)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
We use the optimized linear δ expansion and functional methods to study vacuum contributions in nuclear matter up to the lowest non-trivial order which includes exchange terms. We show that well known results (MFT, RHA and HF) can be easily reproduced when appropriate limits are taken. Neglecting vacuum contributions we explicitly show that the δ expansion goes beyond the traditional loop approximation previously used to study two loop vacuum contributions in nuclear matter. We then evaluate and renormalize vacuum exchange contributions showing that they are numerically very large, as predicted by the ordinary loop approximation.