Supersymmetry at Ordinary Energy
Everybody knows that there is a gauge hierarchy problem in Grand Unified Theories (GUTS). By now almost everybody knows that supersymmetry offers at least a partial resolution of this problem. A supersymmetric GUT, at energies far below the unification mass, must behave like a supersymmetric extension of the standard color × electro-weak model where the supersymmetry has been broken either explicitly or spontaneously. In this lecture I would like to first discuss the general problems involved in constructing such low energy supersymmetric theories and then to review several recent attempts to build realistic models.
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