Light inflaton completing Higgs inflation

Abstract

We consider the extension of the Standard Model (SM) with a light inflaton where both unitarity problem in Higgs inflation and vacuum instability problem are resolved. The linear non-minimal coupling of the inflaton to gravity leads to a significant kinetic mixing between the inflaton and the graviton such that perturbative unitarity is restored up to Planck scale. We show the correlation between unitarity scale and inflationary observables in this model and discuss how the effective Higgs inflation appears.

7 pages, 3 figures, Title changed, To appear in Physical Reviews D

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• Occurrence of Tachyonic Preheating in the Mixed Higgs-$R^2$ Model
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• Unitary inflaton as decaying dark matter
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• Type II Seesaw Leptogenesis
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• Perturbative Reheating in the Mixed Higgs-$R^2$ Model
• Observational constraints on $\alpha$-attractor inflationary models with a Higgs-like potential
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• Lepton Flavour Violation Tests of Type II Seesaw Leptogenesis
• Perturbative unitarity in quasi-single field inflation
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• Hybrid metric-Palatini Higgs inflation
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• Unitarizing non-Minimal Inflation via a Linear Contribution to the Frame Function
• Vacuum stability of the type II seesaw leptogenesis from inflation
• Inflation and Supersymmetry Breaking in Higgs-$R^2$ Supergravity