Flat-Directions in Grand Unification With U(1)R Symmetry
Abstract
It is shown that in SO(10) and SU(5) models having a U(1)R symmetry, the requirement of breaking the unified group to the Standard Model leads to flat directions in the scalar potential. These can lead to a ``cosmological modulus problem". This is relevant to grand unified models of inflation, where U(1)R symmetries are often used to insure the flatness of the inflaton potential. A way that the modulus problem might be avoided is discussed.
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