2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47590We study the properties of the QCD vacuum in the dual Ginzburg-Landau theory, where QCD-monopole condensation leads to the linear confinement potential. Using the effective potential, we find monopole dominance for chiral-symmetry breaking. The effective mass of off-diagonal (charged) gluons is estimated as $M_{ch} \simeq 1.31$ GeV. The gluon condensate is calculated as $<\frac{α_{s}}πG^2 > = (344 MeV)^4$.3 pages, LateX, sprocl.sty and 2 figures included. Talk presented by S. Umisedo at XVII RCNP International Symposium on Innovative Computational Methods in Nuclear Many-Body Problems (INNOCOM97), 10 - 15, Nov., 1997, Osaka, JapanHigh Energy Physics - Phenomenologytext