A Unitarity-Conserving Higgs Inflation Model

Abstract

Scalar field models of inflation based on a large nonminimal coupling to gravity xi, in particular, Higgs inflation, may violate unitarity at an energy scale ~ M_p / xi << M_p. In this case the model is incomplete at energy scales relevant to inflation. Here we propose a new unitarity-conserving model of Higgs inflation. The completion of the theory is achieved via additional interactions which are proportional to products of the derivatives of the Higgs doublet. The resulting model differs from the original version of Higgs inflation in its prediction for the spectral index, with a classical value n = 0.974. In the case of a nonsupersymmetric model, quantum corrections are likely to strongly modify the tree-level potential, suggesting that supersymmetry or a gauge singlet scalar inflaton is necessary for a completely successful model.

5 pages, published version

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• Higgs-Palatini Inflation and Unitarity
• Higgs G-inflation
• Violent Preheating in Inflation with Nonminimal Coupling
• Frame-dependence of higher-order inflationary observables in scalar-tensor theories
• Multifield Dynamics of Higgs Inflation
• Remarks on Higgs Inflation
• Supergravity Higgs Inflation and Shift Symmetry in Electroweak Theory
• A new extended quintessence
• Cosmological Constraints on the Higgs Boson Mass
• Non-Minimal Chaotic Inflation, Peccei-Quinn Phase Transition and non-Thermal Leptogenesis
• Inflation due to non-minimal coupling of $f(R)$ gravity to a scalar field