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 - 108) GeV for the cases n = 3 - 10. Baryogenesis in this model is also discussed briefly.
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Kumekawa et al. (1994) studied this question.
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