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We study the validity of the large-N equivalence between four-dimensionalSU(N) lattice gauge theory and its momentum quenched version -- the QuenchedEguchi-Kawai (QEK) model. We have found strong evidence that this equivalencedoes not hold in the weak-coupling regime (and thus in the continuum limit).This is based on weak-coupling analytic arguments and Monto-Carlo simulationsat intermediate couplings with 20 <= N <= 200. Since detailed expositions ofour arguments, methods and results have already appeared in Phys. Rev.D78:034507 (2008) and Phys. Rev. D78:074503 (2008), we attempt here to give amore intuitive explanation of our results. The breakdown of reduction that wefind is due to a dynamically generated correlation between different Euclideancomponents of the gauge fields.

Breakdown of large-N reduction in the quenched Eguchi-Kawai model