Collective-field method for a U(N)-invariant model in the large-N limit (original) (raw)

Journal of physics, 1991

Abstract

ABSTRACT The authors use the collective-field method to discuss the weak- and strong-coupling phases of the one-plaquette U(N)-invariant model. In both phases they obtain a unified description in terms of collective fields and their collections. The ground-state energy including the next-to-leading-order term is finite owing to explicit cancellation of divergences except at the critical point of the phase transition.

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