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Examines chaotic inflation implications for dark energy, suggesting improved model fitting to ACT data.
A bstract Following the recent Atacama Cosmology Telescope (ACT) results, we revisit chaotic inflation based on a single complex scalar field with mass term M 2 |Φ| 2 , which usually predicts a spectral index n s ≈ 0.96 but a too-large tensor to scalar ratio r ≈ 0.16. With radiative corrections, the potential M 2 |Φ| 2 ln (|Φ| 2 /Λ 2 ) induces spontaneous symmetry breaking near the scale Λ, yielding a Pseudo Nambu-Goldstone boson which can play the role of a quintessence field, hence radiative inflation and dark energy (RIDE). Including a non-minimal coupling to gravity ξ |Φ| 2 R 2 with ξ ~ 0.1 reduces the tensor to scalar ratio to r ≲ 0.03, allowing a good fit of the RIDE model to Planck data. Allowing a small additional quartic coupling correction λ |Φ| 4 allows a good fit to ACT data sets for ξ ∼ 1 and λ ∼ 10 −5 .
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Keus et al. (2026) studied this question.
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