4 citations · 13 across the 7 of their papers we have counts for
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cond-mat.str-el2003★ 1 cited
Many-body theory of degenerate systems: A simple example
Christian Brouder
The hierarchy of Green functions for (quasi)degenerate systems, presented in cond-mat/0308058, is calculated in detail for the case of a system with closed shells plus a single ele…
cond-mat.str-el2003★ 4 cited
Many-body theory of degenerate systems
Christian Brouder
The many-body theory of degenerate systems is described in detail. More generally, this theory applies to systems with an initial state that cannot be described by a single Slater…
hep-th2003
Quantum field theory of degenerate systems
Christian Brouder
To set up a self-consistent quantum field theory of degenerate systems, the unperturbed state should be described by a density matrix instead of a pure state. This increases the co…