W.Thirring , H.Narnhofer
Covariant QED without Indefinite Metric
(41K, LaTeX)
ABSTRACT. We construct for the linearized Higgs model a representation of the
field operators in a Hilbert space H with the following features:
1) H has a positive definite metric but is nonseparable.
2) The vacuum is gauge invariant.
3) The gauge variant operators exist only in their exponentiated
form as unitaries.
4) There is a subspace of H where $A_\mu{}^{,\mu}$ is represented
by 0.