%0 Journal Article
%T Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio
%A Kim, J.
%A Ko, P.
%A Park, W. I.
%J Journal of Cosmology and Astroparticle Physics
%D 2017
%V 02
%N 2
%I Iop Publishing Ltd
%@ 1475-7516
%G English
%F Kim_etal2017
%O WOS:000399455000003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3080), last updated on Thu, 11 May 2017 16:15:42 +0000
%X We show that the Higgs portal interactions involving extra dark Higgs field can save generically the original Higgs inflation of the standard model (SM) from the problem of a deep non-SM vacuum in the SM Higgs potential. Specifically, we show that such interactions disconnect the top quark pole mass from inflationary observables and allow multi-dimensional parameter space to save the Higgs inflation, thanks to the additional parameters (the dark Higgs boson mass m(phi), the mixing angle a between the SM Higgs H and dark Higgs Phi, and the mixed quartic coupling) affecting RG-running of the Higgs quartic coupling. The effect of Higgs portal interactions may lead to a larger tensor-to-scalar ratio, 0.08 less than or similar to r less than or similar to 0.1, by adjusting relevant parameters in wide ranges of alpha and m(phi), some region of which can be probed at future colliders. Performing a numerical analysis we find an allowed region of parameters, matching the latest Planck data.
%K inflation
%K particle physics – cosmology connection
%K physics of the early universe
%R 10.1088/1475-7516/2017/02/003
%U http://arxiv.org/abs/1405.1635
%U https://doi.org/10.1088/1475-7516/2017/02/003
%P 003-16pp