Finite-temperature T matrix in a real-time formalism

Canivell Cretchley, VíctorGarrido Beltrán, LluísSan Miguel Ruibal, MaximinoSeglar, P. (Pedro)2009-09-222009-09-2219781050-2947https://hdl.handle.net/2445/9365A generalized off-shell unitarity relation for the two-body scattering T matrix in a many-body medium at finite temperature is derived, through a consistent real-time perturbation expansion by means of Feynman diagrams. We comment on perturbation schemes at finite temperature in connection with an erroneous formulation of the Dyson equation in a paper recently published.6 p.application/pdfeng(c) The American Physical Society, 1978Teoria quànticaQuantum kineticsFinite-temperature T matrix in a real-time formalisminfo:eu-repo/semantics/article3673info:eu-repo/semantics/openAccess