Abstract
We give conditions for the existence of field operators on so-called null planes and discuss some consequences of the necessary restriction of the test function space, concerning Haag's theorem and the possibility of unitary mappings intertwining between free fields of different masses. In the last section we discuss conditions under which a unitary representation of the dilatations in the null plane gives rise to a unitary representation of the dilatations in Minkowski space.
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Schlieder, S., Seiler, E. Some remarks on the “null plane development” of a relativistic quantum field theory. Commun.Math. Phys. 25, 62–72 (1972). https://doi.org/10.1007/BF01877587
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DOI: https://doi.org/10.1007/BF01877587