
Published online:
31 October 2023
Published in print:
02 September 2004
Online ISBN:
9781383029598
Print ISBN:
9780198566335
Contents
Chapter
13 Feynman Diagrams and Pair Interactions
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Karsten Flensberg
Karsten Flensberg
Niels Bohr Institute, University of Copenhagen
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Pages
226–245
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Published:September 2004
Cite
Bruus, Henrik, and Karsten Flensberg, 'Feynman Diagrams and Pair Interactions', Many–Body Quantum Theory in Condensed Matter Physics: An Introduction (Oxford , 2004; online edn, Oxford Academic, 31 Oct. 2023), https://doi.org/10.1093/oso/9780198566335.003.0013, accessed 28 Apr. 2025.
Abstract
It is in the case of interacting particles and fields that the power of quantum field theory and Feynman diagrams really comes into play. In this chapter, we develop the Feynman diagram technique for a system of fermions with pair interactions. The primary example we will work with is a gas of fermions interacting through Coulomb interactions, but the technique is derived in a more general framework. In general, the Hamiltonian has two parts H = H 0 + W .
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