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In this paper we study the Casimir energy of QCD within the Gribov-Zwanzigerapproach. In this model non-perturbative effects of gauge copies are properlytaken into account. We show that the computation of the Casimir energy for theMIT bag model within the (refined) Gribov-Zwanziger approach not only gives thecorrect sign but it also gives an estimate for the radius of the bag.

Casimir energy in the Gribov-Zwanziger approach to QCD