The logic of the nonequilibrium diagram technique (Keldysh diagram technique) appearance is reviewed. Simple examples are used to illustrate the implementation of the technique and to demonstrate possible difficulties and how to overcome them. Together with the well known facts, some lesser-discussed details are considered, in particular, whether the so-called three-component technique is necessary. A number of examples of nonequilibrium diagram technique (NDT) applications are given, including in particular tunneling systems, the linear response and other problems. We hope that some parts of the review will be useful even for those people for whom nonequilibrium diagram technique is well familiar.

Keywords: diagram technique, nonequilibrium diagram technique, Keldysh diagram technique, nonequilibrium processes, quantum kinetics PACS: 03.70.+k, 05.60.Gg, 11.10.Wx, 72.10.Bg (all) DOI: 10.3367/UFNe.0185.201512b.1271 URL: https://ufn.ru/en/articles/2015/12/b/ 000371914300002 2-s2.0-84962798469 2015PhyU...58.1159A Citation: Arseev P I "On the nonequilibrium diagram technique: derivation, some features and applications" Phys. Usp. 58 1159–1205 (2015) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Received: 4th, August 2015, revised: 11th, October 2015, accepted: 12th, October 2015 Оригинал: Арсеев П И «О диаграммной технике для неравновесных систем: вывод, некоторые особенности и некоторые применения» УФН 185 1271–1321 (2015); DOI: 10.3367/UFNr.0185.201512b.1271