Transient turns in the hyperbolic field space of Higgs-R^2 multifield inflation generate f_NL^loc ≃ -17.7, which approaches the single-field consistency value as the nonminimal coupling increases.
Occurrence of tachyonic preheating in the mixed Higgs-R2 model
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An R^3 modification to R^2-Higgs inflation fits the high n_s by inducing Goldstone preheating that reconciles CMB and inflationary energy scales.
Numerical multi-field analysis of Higgs-R² inflation with kinetic mixing identifies two regimes: moderate ξ_h produces localized features in the curvature power spectrum via isocurvature transfer, while weak ξ_h leaves a nearly featureless spectrum with residual isocurvature.
Authors add induced gravity and a polynomial potential to an F(R) model, transform to a two-field chiral cosmology, and find parameter choices that match ACT inflation data while yielding PBH masses compatible with dark matter.
Dimension-six operators |Φ|²R² and |Φ|⁴R in R²-Higgs inflation accommodate enhanced n_s from CMB+BAO data and enable rapid preheating via Goldstone modes.
citing papers explorer
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Large primordial non-Gaussianity from transient turns in Higgs-$R^2$ inflation
Transient turns in the hyperbolic field space of Higgs-R^2 multifield inflation generate f_NL^loc ≃ -17.7, which approaches the single-field consistency value as the nonminimal coupling increases.
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Isocurvature-induced features in multi-field Higgs-$R^2$ inflation
Numerical multi-field analysis of Higgs-R² inflation with kinetic mixing identifies two regimes: moderate ξ_h produces localized features in the curvature power spectrum via isocurvature transfer, while weak ξ_h leaves a nearly featureless spectrum with residual isocurvature.
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Nonminimal couplings and preheating effects in $R^2$-Higgs inflation after ACT and SPT
Dimension-six operators |Φ|²R² and |Φ|⁴R in R²-Higgs inflation accommodate enhanced n_s from CMB+BAO data and enable rapid preheating via Goldstone modes.