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Manybody theory of degenerate systems
, 2003
"... Abstract. The manybody 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 determinant. The doublesource (or closedtimepath) formalism of nonequilibrium quantum field theory is used t ..."
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Abstract. The manybody 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 determinant. The doublesource (or closedtimepath) formalism of nonequilibrium quantum field theory is used to derive an expression for the average value of a product of interacting fields when the initial state is not the vacuum or a Slater determinant. Quantum group techniques are applied to derive the hierarchy of unconnected Green functions and the hierarchy of connected ones. PACS numbers: 03.70.+k,11.10.Gh,03.65.Fd ยง To whom correspondence should be addressed (christian.brouder@lmcp.jussieu.fr) Manybody theory of degenerate systems 2 1.