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Abstract
Charge operator and charged sectors in four-dimensional QED are investigated, both within a local, covarian (indefinite metric), and within a positive metric formulation of QED. Assuming a few basic, physical principles-such as Gauss'law and a correspondence principle, etc.-we conclude that charge states determine non-Fock ( coherent state) representations of the algebra generated by the asymptotic, electromagnetic field, that Lorentz boosts do not leave the harged sectors invariant ( spontaneous breaking of boost symmetry), and that an unambiguous definition of the “mass” of the charged infraparticles is possible. This and other results represent first steps at extending the Haag-Ruelle scattering theory to charged infraparticles.
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