A small, string-theoretically plausible deformation of the Starobinsky potential (lambda about 0.9999) fits the Planck plus ACT and DESI value of the spectral tilt better than the pure Starobinsky model, and introduces a barrier that avoids super-Planckian inflaton initial conditions.
Chaotic Inflation and Baryogenesis in Supergravity
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abstract
We propose a K\"ahler potential in supergravity which successfully accommodates chaotic inflation. This model can have a large gravitino mass without giving a large mass to squarks and sleptons, and thus is free from both the gravitino problem and entropy crisis. In this model baryogenesis takes place naturally, identifying the inflaton with a right-handed sneutrino with its mass $M \simeq 10^{13}$GeV, which is consistent with the COBE data and the Mikheyev--Smirnov--Wolfenstein solution to the solar neutrino problem. The model can also accommodate the matter content appropriate for the mixed dark matter scenario.
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How Accidental was Inflation?
A small, string-theoretically plausible deformation of the Starobinsky potential (lambda about 0.9999) fits the Planck plus ACT and DESI value of the spectral tilt better than the pure Starobinsky model, and introduces a barrier that avoids super-Planckian inflaton initial conditions.