Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio
- Quantum Universe Center, Korea Institute for Advanced Study, 85 Hoegiro Dongdaemungu, Seoul 02455 (Korea, Republic of)
- Departament de Física Teòrica and IFIC, Universitat de València-CSIC, E-46100, Burjassot (Spain)
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 {sub φ}, the mixing angle α between the SM Higgs H and dark Higgs Φ, 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 ∼< r ∼< 0.1, by adjusting relevant parameters in wide ranges of α and m {sub φ}, 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.
- OSTI ID:
- 22680050
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 02 Vol. 2017; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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