Abstract : A generalization of the Hohenberg-Kohn theorem for finite systems proves the existence of a density functional (DF) for a symmetry violating intrinsic state, out of which a physical state with good quantum numbers can be projected.
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B. Giraud, B. Jennings, B. Barrett. Existence of a density functional for an intrinsic state. Physical Review A, American Physical Society, 2008, 78 (3), pp.032507. ⟨10.1103/PhysRevA.78.032507⟩. ⟨cea-02889097⟩