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We study the correlation between confinement and dynamical chiral-symmetrybreaking (D$\chi$SB) in the dual Ginzburg-Landau (DGL) theory using theeffective potential formalism. The DGL theory is an infrared effective theorybased on the dual Higgs mechanism, and provides the nonperturbative gluonpropagator, which leads to the linear quark potential. The screening effect forthe confining potential can be obtained by introducing the infrared cutoffcorresponding to the hadron size. We formulate the effective potential forD$\chi$SB in the DGL theory, and find the vacuum instability against quarkcondensation. To extract confinement effect, we separate the effectivepotential into the confinement part and others by dividing the confinement termfrom other terms in the gluon propagator in the DGL theory. The confinementpart provides the dominant contribution to D$\chi$SB, which is regarded asmonopole dominance for D$\chi$SB. The relevant energy for D$\chi$SB is found tobe the infrared region below 1GeV. Monopole dominance for the DGL propagator isalso found in the intermediate region, 0.2fm $\simle r \simle$ 1fm.Comment: 13pages,LaTeX,8figure

Correlation between confinement and chiral-symmetry breaking in the dual Higgs theory