Particle-number-conserving functional integrals for angular-momentum and parity-projected many-body matrix elements
Author: Puddu, G.
Source: Journal of Physics G: Nuclear and Particle Physics, Volume 27, Number 8, 2001 , pp. L73-L80(8)
Publisher: IOP Publishing
Abstract:We obtain exact functional integrals expressions for many-body matrix elements of the type ,J,,N,Z|e-|,J,,N,Z, between states having good angular-momentum, parity and particle number, in the case of particle-number-preserving functional integrals expressions for e- are used. Compact expressions are obtained without using angular-momentum projectors.
In the case of an even number of particles, a new proof of positivity for the pairing plus quadrupole model is given, which is angular-momentum and parity projected to J = 0+. It is shown that the propagator in the functional integral is reduced to a Hermitian positive-definite propagator by the use of angular-momentum eigenstates.
Document Type: Miscellaneous
Publication date: 2001-01-01