Abstract
In Calabi-Yau string compactification, it is pointed out that there exists a new type of SU(5) ×U(1)2 mode (the aligned SU(5) ×U(1)2 model) in which the SU(5) differs from the standard SU(5) and also from the flipped SU(5). With the aid of the discrete symmetry suggested from Gepner model, we propose a simple and phenomenologically interesting three-generation model with the aligned SU(5) ×U(1)2 gauge symmetry. The triplet-doublet splitting problem can be solved. It is also found that there is a realistic solution for solar neutrino problem and for the µ-problem. At low energies this model is in accord with the minimal supersymmetric standard model except for the existence of singlet fields with masses of O(1) TeV.
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