Converting Contour-Time to Real-Time Arguments
Abstract
The nonequilibrium diagrammatics and the Dyson equations contain integrations over the time variables that run over a generic contour. In both cases, the time variables run first forward and then backward along the ordinary time axis. For computational purposes, it is then required to convert these time integrals into ordinary time integrals. To this end, it is first necessary to single out all possible combinations of the pair of time variables in the contour single-particle Green’s function. This is what is done in the present chapter.
Fields of Study & Subjects
Quantum many-body systems
Physics of Superconductivity and Magnetism
Theoretical and Computational Physics
Publication details
- Journal / source
- Cambridge University Press eBooks
- Pages
- 83–95
- Publication date
- 6 February 2026
- Document type
- Book chapter