6533b854fe1ef96bd12aea05
RESEARCH PRODUCT
Observational signatures of Higgs inflation
Sami NurmiSami NurmiVera-maria EnckellVera-maria EnckellKari EnqvistKari Enqvistsubject
Particle physicsMatching (statistics)Cosmology and Nongalactic Astrophysics (astro-ph.CO)STANDARD MODELFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic Astrophysics114 Physical sciences01 natural sciencesStandard ModelHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesphysics of the early universeinflationELECTROWEAK VACUUM010306 general physicscosmology of theories beyond the SMBosonInflation (cosmology)PhysicsSpectral index010308 nuclear & particles physicsINDUCED GRAVITY INFLATIONHigh Energy Physics::PhenomenologySpectral densityBOSONAstronomy and Astrophysics115 Astronomy Space scienceHigh Energy Physics - Phenomenologyparticle physics - cosmology connectionJumpHiggs bosonHigh Energy Physics::ExperimentAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We investigate the dependency of Higgs inflation on the non-renormalisable matching between the low energy Standard Model limit and the inflationary regime at high energies. We show that for the top mass range $m_t \gtrsim 171.8$ GeV the scenario robustly predicts the spectral index $n_s \simeq 0.97$ and the tensor-to-scalar ratio $r\simeq 0.003$. The matching is however non-trivial, even the best-fit values $m_h=125.09$ GeV and $m_t=173.21$ GeV require a jump $\delta \lambda \sim 0.01$ in the Higgs coupling below the inflationary scale. For $m_t\lesssim 171.8$ GeV, the matching may generate a feature in the inflationary potential. In this case the predicted values of $n_s$ and $r$ vary but the model is still falsifiable. For example, a detection of negative running of spectral index at level $\alpha_s \lesssim -0.01$ would rule out Higgs inflation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-03-24 |