A flipped SU(5) sneutrino tribrid inflation model with an independent cutoff scale matches the ACT DR6 and Planck n_s and predicts an observable tensor-to-scalar ratio plus non-thermal leptogenesis.
Hybrid Inflation in Supergravity
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abstract
We propose a simple realization of hybrid inflation in supergravity, which does not require any unnaturally small parameters. Inflation in this scenario is relatively short, and inflationary density perturbations fall down on large scales, which corresponds to a blue spectrum with n > 1. Superheavy strings which are formed after inflation in this scenario produce density perturbations of comparable magnitude. In this mixed perturbation (MP) model one may have microwave anisotropy produced by strings and galaxy formation due to inflationary perturbations.
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Sneutrino Tribrid Inflation in Flipped $\mathbf{SU(5)}$: Confronting ACT DR6 and Planck
A flipped SU(5) sneutrino tribrid inflation model with an independent cutoff scale matches the ACT DR6 and Planck n_s and predicts an observable tensor-to-scalar ratio plus non-thermal leptogenesis.