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Flat-Directions in Grand Unification With $U(1)_R$ Symmetry

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arxiv hep-ph/0511097 v1 pith:YEYWINFI submitted 2005-11-08 hep-ph

S. M. Barr , Bumseok Kyae , Qaisar Shafi This is my paper · ORCID
classification hep-ph
keywords grandmodelsmoduluspotentialproblemsymmetryunifiedavoided
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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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  1. Supersymmetric Hybrid Inflation with K\"{a}hler-Induced $\mathbf{R}$-Symmetry Breaking

    hep-ph 2025-06 conditional novelty 5.0 of 10

    Nonrenormalizable R-symmetry breaking in the Kahler potential can tune the spectral index of supersymmetric hybrid inflation into the ACT DR6 window while keeping tensor modes below 1e-5.

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