Hybrid Higgs inflation: The use of disformal transformation

Seiga Sato, Kei Ichi Maeda

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


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 nonminimal coupling constant ξ 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 the new Higgs inflationary model to that in the conventional Higgs inflationary model as |ξ| increases. We confirm our results by numerical analysis by ADM formalism of the full theory in the Jordan frame.

Original languageEnglish
Article number083512
JournalPhysical Review D
Issue number8
Publication statusPublished - 2018 Apr 17
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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