Work

Chaotic Inflation RIDES Again

Year: 2025

Type: other

Abstract: 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 spectra index $n_s\approx 0.96$ but a too-large tensor to scalar ratio $r\approx 0.16$. With radiative corrections, the potential $M^2 |Φ|^2 \ln \left( |Φ|^2/Λ^2 \right)$ 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 $ξ|Φ|^2 R^2$ reduces $r$, allowing a good fit of the RIDE model to Planck data. Allowing a small additional quartic coupling correction $λ|Φ|^4$ increases both $n_s$ and $r$, with a good fit to ACT data sets achieved for $ξ\approx 1$.

Source: ePrints Soton (University of Southampton)

DOI: 10.48550/arxiv.2511.05799

Authors: Keus, Venus, King, Stephen F.

Institutions: Dublin Institute For Advanced Studies, University of Helsinki, Helsinki Institute of Physics, University of Southampton

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7104937445

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