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We investigate a D-brane system in which spontaneous gauge symmetry breakingoccurs. The system consists of four D3-branes and three anti-D7-branes atC^3/Z_3 singularity. The singularity is blown up by vacuum expectation valuesof the states of twisted closed string, whose effects appear asFayet-Iliopoulos terms in low-energy effective field theory. We derive aneffective potential for scalar fields in four-dimensional effective fieldtheory using the technique of superstring world-sheet theory. Since there is nosupersymmetry in this system, one-loop masses for some scalar fields areconsidered. We find some stationary and stable vacua in which the original U(2)x U(1)_1 x U(1)_2 x U(3) gauge symmetry is spontaneously broken to U(1) x U(1)'x U(3) gauge symmetry. Both Fayet-Iliopoulos terms and one-loop masses arenecessary for the existence of such vacua. We carefully investigate ageometrical aspect of the gauge symmetry breaking. We show that the gaugesymmetry breaking is understood as the separation of D3-branes. Someimplications to the possibility of low-scale string models are also discussed.

Spontaneous Gauge Symmetry Breaking in a Non-Supersymmetric D-brane Model