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Issues of SU(5) grand unification in type IIB orientifolds. (English) Zbl 1185.81125

Summary: We review some of the recent developements on realising grand unified theories in string theory. We explain that F-theory GUTs combine all the model building advantages of the heterotic string with a natural framework for advancing the hierarchy between the GUT and the Planck scale to a basic string model building concept. In the second more technical part some issues for the weakly couple Type IIB orientifold regime are discussed in more detail.

MSC:

81V22 Unified quantum theories
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