Abstract
It is shown that the difficulties connected with Haag's theorem can be bypassed, without losing Euclidean invariance, if the time evolution is considered as being only locally unitarily implementable.
A variant of the conventional interaction picture is defined, and a perturbation expansion derived which is shown to converge absolutely for a class of (non-trivial) Euclidean invariant 2-dimensional models.
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Research supported in part by the U.S. Air Force Office of Research, Air Research and Development Command.
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Guenin, M. On the interaction picture. Commun.Math. Phys. 3, 120–132 (1966). https://doi.org/10.1007/BF01645449
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DOI: https://doi.org/10.1007/BF01645449