Symmetry Breaking Bulk Effects in Local D-brane Models

We study symmetrybreaking effects in local D-brane models that arise as a result of compactification, focusing on models constructed on C3/Z3. Zero-modes of the Lichnerow-icz operator in cone-like geometries have a power law behaviour; thus the leading symmetry breaking effects are captured by the modes with the lowest scaling dimension which trans-form non-trivially under the isometry group. Combining this with the fact that global symmetries in local models are gauged upon compactification we determine the strength and form of the leading operators responsible for the symmetry breaking. electronic address