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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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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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.
- Scalaron dark matter dynamics: effects of Higgs non-minimal coupling to gravity