A well-motivated cosmological hybrid inflation scenario based on no-scale SUGRA is considered. It is demonstrated that an extra suppressed R-symmetry breaking term Sⁿ with n≥ 4 needs to be included in order to realize successful inflation. The resulting potential is found to be similar (but not identical) to the one in the Starobinsky inflation model. A relatively larger tensor-to-scalar ratio r~ 10⁻² and a spectral index nₛ≈ 0.965 are obtained, which are approximately independent of n.
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Wan et al. (2024) studied this question.
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