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We propose a new mechanism of spontaneous gauge symmetry breaking in theworld-volume theory of revolving D-branes around a fixed point of orbifolds. Inthis paper, we consider a simple model of the T6/Z3 orbifold on which we putD3-branes, D7-branes and their anti-branes. The configuration breakssupersymmetry, but the R-R tadpole cancellation conditions are satisfied. A setof three D3-branes at an orbifold fixed point can separate from the point, butwhen they move perpendicular to the anti-D7-branes put on the fixed point, theyare forced to be pulled back due to an attractive interaction between the D3and anti-D7 branes. In order to stabilize the separation of the D3-branes atnonzero distance, we consider revolution of the D3-branes around the fixedpoint. Then the gauge symmetry on D3-branes is spontaneously broken, and therank of the gauge group is reduced. The distance can be set at our will byappropriately choosing the angular momentum of the revolving D3-branes, whichshould be determined by the initial condition of the cosmological evolution ofD-brane configurations. The distance corresponds to the vacuum expectationvalues of brane moduli fields in the world-volume theory and, if it is writtenas M/Ms^2 in terms of the string scale Ms, the scale of gauge symmetry breakingis given by M. Angular momentum conservation of revolving D3-branes assures thestability of the scale M against Ms.

Revolving D-branes and Spontaneous Gauge Symmetry Breaking