Small Extra Dimensions from the Interplay of Gauge and Supersymmetry Breaking

Understand

Higher-dimensional theories provide a promising framework for unified extensions of the supersymmetric standard model.

• Compactifications to four dimensions often lead to U(1) symmetries beyond the standard model gauge group, whose breaking scale is classically undetermined.
• Without supersymmetry breaking, this is also the case for the size of the compact dimensions.
• Fayet-Iliopoulos terms generically fix the scale M of gauge symmetry breaking.