Another proof of Gell-Mann and Low's theorem

Details Another proof of Gell-Mann and Low's theorem Another proof of Gell-Mann and Low's theorem

2006-12-11

arxiv.org/abs/math-ph/0612030v1

Journal of Mathematical Physics 48, 052113 (2007)

Physics

Mathematical Physics

5 pages

Scientific paper

10.1063/1.2740469

The theorem by Gell-Mann and Low is a cornerstone in QFT and zero-temperature
many-body theory. The standard proof is based on Dyson's time-ordered expansion
of the propagator; a proof based on exact identities for the time-propagator is
here given.

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