title: Symmetry restoration in Hartree-Fock-Bogoliubov based theories.
abstract: We present a Pfaffian formula for projection and symmetry restoration for wave functions of the general Bogoliubov form, including quasiparticle excited states and linear combinations of them. This solves a long-standing problem in calculating states of good symmetry, arising from the sign ambiguity of the commonly used determinant formula. A simple example is given of projecting a good particle number and angular momentum from a Bogoliubov wave function in the Fock space of a single j-shell.
authors.affiliation: Institute for Nuclear Theory and Department of Physics, Box 351560, University of Washington, Seattle, Washington 98915, USA. bertsch@uw.edu
authors.forename: G F
authors.initials: GF
authors.lastname: Bertsch
authors.forename: L M
authors.initials: LM
authors.lastname: Robledo