%0 Journal Article
%A Ema, Yohei
%T Dynamical emergence of scalaron in Higgs inflation
%J Journal of cosmology and astroparticle physics
%V 2019
%N 09
%@ 1475-7516
%C London
%I IOP
%M PUBDB-2019-03763
%M arXiv:1907.00993
%M DESY-19-117
%P 027 - 027
%D 2019
%X We point out that a light scalaron dynamically emerges if scalar fields have a sizable non-minimal coupling to the Ricci scalar as in the Higgs inflation model. We support this claim in two ways. One is based on the renormalization group equation; the non-minimal coupling inevitably induces a Ricci scalar quadratic term due to the renormalization group running. The other is based on scattering amplitudes; a scalar four-point amplitude develops a pole after summing over a certain class of diagrams, which we identify as the scalaron. Our result implies that the Higgs inflation is actually a two-field inflationary model. Another implication is that the Higgs inflation does not suffer from the unitarity issue since the scalaron pushes up the cut-off scale to the Planck scale.
%F PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
%9 ReportJournal Article
%U <Go to ISI:>//WOS:000487690100003
%R 10.1088/1475-7516/2019/09/027
%U https://bib-pubdb1.desy.de/record/426508