Quantum statistical mechanics : Green's function methods in equilibrium and nonequilibrium problems

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Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach (2016, methodology): “The key ingredient is the use of the nonequilibrium Green’s function theory based on the seminal papers by Schwinger[544], Kadanoff and Baym[545] and Keldysh[546].”
A Mellin space approach to cosmological correlators (2019, methodology): “In time-dependent backgrounds it is useful to employ the Schwinger-Keldysh (or “in-in”) formalism [60–62] for perturbative evaluations of expectation values.”
CP2K: An electronic structure and molecular dynamics software package - Quickstep: Efficient and accurate electronic structure calculations. (2020, background): “[364] L.”
Superfluidity in nuclear systems and neutron stars (2018, background): “The foundations of self-consistent Green functions (SCGF) theory were established long ago (see especially [199]).”
Bootstrapping inflationary correlators in Mellin space (2019, methodology): “In time-dependent backgrounds like de Sitter, the standard approach to compute vacuum expectation values is the Schwinger-Keldysh (or in-in) formalism [94–96].”
Electron-phonon interactions from first principles (2016, background): “4, and require concepts based on non-equilibrium Green’s functions [137].”