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

2005/11/08 by S. M. Barr, Barr, S. M., Bumseok Kyae +3 · 1 citation
Mathematics · Physics and Astronomy · #Advanced Differential Equations and Dynamical Systems #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · pdf · doi:10.48550/arxiv.hep-ph/0511097

openalex publication_date 2005/11/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

Citations

• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Preliminary Maps and Basic Results

Cited by

• Supersymmetric Hybrid Inflation with Kähler-Induced R-Symmetry Breaking

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