Abstract
The second quantization for many-body systems is introduced. Within this formalism an elementary derivation of a non-Markovian quantum kinetic equation is given for the reduced density matrix. Next we review the equilibrium Green functions, including the dissipation-fluctuation theorem, the self-energy concept, and the perturbation expansion.
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Equilibrium Green Function Theory. (2008). In Springer Series in Solid-State Sciences (Vol. 123, pp. 35–59). Springer Science and Business Media Deutschland GmbH. https://doi.org/10.1007/978-3-540-73564-9_3
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