Contour-Ordered Green’s Functions in the Nambu Representation
Abstract
This chapter utilizes the Nambu pseudo-spinor field operators for the superfluid phase, to reformulate in terms of them the closed-time-path Green’s functions, the ensuing nonequilibrium Dyson equations, the conversion of contour-time to real-time arguments, and the Langreth rules. In this way, the results obtained previously within a mean-field decoupling are framed in a more general context, which will later make it possible to include beyond-mean-field effects for the superfluid phase.
Fields of Study & Subjects
Physics of Superconductivity and Magnetism
Quantum many-body systems
Cold Atom Physics and Bose-Einstein Condensates
Publication details
- Journal / source
- Cambridge University Press eBooks
- Pages
- 176–183
- Publication date
- 6 February 2026
- Document type
- Book chapter