Spectral self-decoupling

The zeroth order degeneracy of K and T-states is lifted in the spectral representation of the fully interacting Green s function. The exact eigenstates decouple to yield A -particle states in the second component and tensor products of W — 1 and N -L 1-particle states in the third component. We will come back to discuss the meaning of the degenerate states A >) in connection with the lowest order of the static self energy S oo) in Sec. V. 

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