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Flat Potential for Inflaton with a Discrete R-Invariance in Supergravity
We show that a very flat potential of inflaton required for a sufficient inflation is naturally obtained in N = 1 supergravity by imposing a discrete R-invariance Zn (n ≥3). Several cosmological constraints on parameters in the inflaton superpotential are derived. The reheating temperature turns out to be (1 - …