Another proof of Gell-Mann and Low's theorem
Mathematical Physics
2007-06-13 v1 Strongly Correlated Electrons
High Energy Physics - Theory
math.MP
Abstract
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.
Cite
@article{arxiv.math-ph/0612030,
title = {Another proof of Gell-Mann and Low's theorem},
author = {Luca Guido Molinari},
journal= {arXiv preprint arXiv:math-ph/0612030},
year = {2007}
}
Comments
5 pages