The theorem by Gell-Mann and Low is a cornerstone in quantum field theory 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.
Another proof of Gell-Mann and Low's theorem / L.G.A. Molinari. - In: JOURNAL OF MATHEMATICAL PHYSICS. - ISSN 0022-2488. - 48:5(2007), pp. 052113.52113-1-052113.52113-4. [10.1063/1.2740469]
Another proof of Gell-Mann and Low's theorem
L.G.A. MolinariPrimo
2007
Abstract
The theorem by Gell-Mann and Low is a cornerstone in quantum field theory 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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