Interpretation of space-like solutions of infinite-component wave equations and Grodsky-Streater 'No-Go' theorem

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Abstract
The existence of space-like solutions of infinite-component wave equations is not a 'disease' but a virtue. By comparing quantum electrodynamics with the infinite-component wave equations for bound electrons the authors show that the space-like solutions correspond to relativistic negative-energy solutions of the constituents of the composite system. Hence they have physical consequences in second-order processes such as the Compton effect and electromagnetic polarizabilities. Thus the assumption of the 'No-Go' theorem admitting only time-like solutions is too restrictive for a field theory with infinite-component equations.