Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-11-24
Nucl.Phys.B525:3-26,1998
Physics
High Energy Physics
High Energy Physics - Theory
26 pages
Scientific paper
10.1016/S0550-3213(98)00277-6
We develop techniques to classify D- and F-flat directions for N=1 supersymmetric string vacua of the perturbative heterotic string theory, which possess an anomalous U(1) gauge group at the tree level. Genus-one corrections generate a Fayet-Iliopoulos term for the D-term of U(1)_A, which is canceled by non-zero vacuum expectation values (VEVs) of certain massless multiplets in such a way that the anomalous U(1) is broken, while maintaining the D- and F-flatness of the effective field theory. A systematic analysis of flat directions is given for non-zero VEVs of non-Abelian singlets, and the techniques are illustrated for a specific model. The approach sets the stage to classify the D- and F-flat directions for a large class of perturbative string vacua. This classification is a prerequisite to address systematically the phenomenological consequences of these models.
Cleaver Gerald
Cvetic Mirjam
Espinosa Jose Ramon
Everett Lisa L.
Langacker Paul
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