HAL : in2p3-00701279, version 1

arXiv : 1205.5379

DOI : 10.1103/PhysRevC.86.014610

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Physical Review C 86 (2012) 014610

Projected Quasi-particle Perturbation theory

D. Lacroix1, D. Gambacurta1

(2012)

The BCS and/or HFB theories are extended by treating the effect of four quasi-particle states perturbatively. The approach is tested on the pairing hamiltonian, showing that it combines the advantage of standard perturbation theory valid at low pairing strength and of non-perturbative approaches breaking particle number valid at higher pairing strength. Including the restoration of particle number, further improves the description of pairing correlation. In the presented test, the agreement between the exact solution and the combined perturbative + projection is almost perfect. The proposed method scales friendly when the number of particles increases and provides a simple alternative to other more complicated approaches.

1 :	GANIL - Grand Accélérateur National d'Ions Lourds

équipe(s) de recherche : Théorie

Thème(s)

:

Physique/Matière Condensée/Supraconductivité Physique/Physique Nucléaire Expérimentale Physique/Physique Nucléaire Théorique

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Contributeur : Michel Lion <>

Soumis le : Vendredi 25 Mai 2012, 08:43:28

Dernière modification le : Jeudi 26 Juillet 2012, 11:37:46