Haag's theorem | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-29

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Haag%27s_theorem


00:00:46 1 Formal description
00:03:38 2 Physical (heuristic) point of view
00:04:44 3 Workarounds
00:05:33 4 Conflicting reactions of the practitioners of QFT



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SUMMARY
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Rudolf Haag postulated that the interaction picture does not exist in an interacting, relativistic quantum field theory (QFT), something now commonly known as Haag's theorem. Haag's original proof was subsequently generalized by a number of authors, notably Dick Hall and Arthur Wightman, who reached the conclusion that a single, universal Hilbert space representation does not suffice for describing both free and interacting fields. In 1975, Michael C. Reed and Barry Simon proved that a Haag-like theorem also applies to free neutral scalar fields of different masses, which implies that the interaction picture cannot exist even under the absence of interactions.