Abstract
The Green’s functions defined in Chap.8 for a many body system have similar but not identical analytical properties as the Green’s functions, defined in Chap.2, corresponding to a second-order (in time) differential equation. For a translationally invariant system the Fourier transforms of the g’s and g’s can be expressed in terms of a single real quantity A(k,ω) which can be interpreted as 2π times a generalized density of states in k-ω-space.
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References
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© 1979 Springer-Verlag Berlin Heidelberg
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Economou, E.N. (1979). Properties and Use of the Green’s Functions. In: Green’s Functions in Quantum Physics. Springer Series in Solid-State Sciences, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-11900-6_9
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DOI: https://doi.org/10.1007/978-3-662-11900-6_9
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