6533b832fe1ef96bd129a5b4
RESEARCH PRODUCT
Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio
Wan-il ParkJinsu KimPyungwon Kosubject
Particle physicsTop quarkCosmology and Nongalactic Astrophysics (astro-ph.CO)Physics beyond the Standard ModelHigh Energy Physics::LatticeScalar (mathematics)FOS: Physical sciencesAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesStandard Modelsymbols.namesakeHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesPlanck010306 general physicsInflation (cosmology)Physics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyAstronomy and AstrophysicsHiggs fieldHigh Energy Physics - PhenomenologysymbolsHiggs bosonHigh Energy Physics::ExperimentAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
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 $\alpha$ 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, $0.08 \lesssim r \lesssim 0.1$, 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-05-07 |