We propose a hybrid type of the conventional Higgs inflation and new Higgs inflation models. We perform a disformal transformation into the Einstein frame and analyze the background dynamics and the cosmological perturbations in the truncated model, in which we ignore the higher-derivative terms of the Higgs field. From the observed power spectrum of the density perturbations, we obtain the constraint on the non-minimal coupling constant ϵ and the mass parameter M in the derivative coupling. Although the primordial tilt ns in the hybrid model barely changes, the tensor- to-scalar ratio r moves from the value in new Higgs inflationary model to that in the conventional Higgs inflationary model as |ϵ| increases. We confirm our results by numerical analysis by ADM formalism of the full theory in the Jordan frame.
|Publication status||Published - 2017 Dec 12|
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