A Slave-Boson perturbational approach to ground-state properties of the U → ∞ periodic Anderson model is derived as an expansion around the Atomic Limit (V = 0) . In the case of zero temperature any constraint-integral or limiting procedure can be avoided, a gauge-symmetry broken Mean-Field phase is not involved. Physical quantities like the wave vector k dependent Green's function obey a direct representation in Feynman-skeleton diagrams in k-space. A self-consistent 1/N -expansion is derived, and its relati…
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