Cocycles for Boson and Fermion Bogoliubov Transformations

Details Cocycles for Boson and Fermion Bogoliubov Transformations Cocycles for Boson and Fermion Bogoliubov Transformations

1993-05-05

arxiv.org/abs/hep-th/9305014v1

J.Math.Phys.35:96-112,1994

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, UBC preprint (August 92)

Scientific paper

10.1063/1.530744

Unitarily implementable Bogoliubov transformations for charged, relativistic bos\-ons and fermions are discussed, and explicit formulas for the 2-cocycles appearing in the group product of their implementers are derived. In the fermion case this provides a simple field theoretic derivation of the well-known cocycle of the group of unitary Hilbert space operators modeled on the Hilbert Schmidt class and closely related to the loop groups. In the boson case the cocycle is obtained for a similar group of pseudo-unitary (symplectic) operators. I also derive explcite formulas for the phases of one-parameter groups of implementers and, more generally, families of implementers which are unitary propagators with parameter dependent generators.

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