Abstract
We consider the most minimal scale invariant extension of the standard model that allows for successful radiative electroweak symmetry breaking and inflation. The framework involves an extra scalar singlet, that plays the rôle of the inflaton, and is compatibile with current experimental bounds owing to the non-minimal coupling of the latter to gravity. This inflationary scenario predicts a very low tensor-to-scalar ratio r ≈ 10−3, typical of Higgs-inflation models, but in contrast yields a scalar spectral index ns ≃ 0.97 which departs from the Starobinsky limit. We briefly discuss the collider phenomenology of the framework.
Highlights
Before turning to the EWSB mechanism, we briefly review the non-minimal inflation scenario first sketched in [13]
We discussed the most minimal CSI extension of the SM able to account for successful EWSB and inflation
Such a model involves an extra scalar singlet that plays the role of the inflaton and relies on a non-minimal coupling of the latter to gravity
Summary
Before turning to the EWSB mechanism, we briefly review the non-minimal inflation scenario first sketched in [13]. Δ = βλφ/λφ being βλφ the beta function of the inflaton self-coupling λφ, which we regard as a free parameter in this model independent approximation. The dark and light green regions correspond to the 1σ and 2σ confidence intervals from the new BICEP2/Keck Array data [18], whereas the black, yellow, and orange lines respectively identify the quadratic, linear and Starobinsky solutions for 50 < Ne < 60. It is clear that the quantum corrections differentiate the CSI solutions from the Starobinsky ones, favouring higher values of the spectral index ns in line with the latest measurements [19, 20]. The blue lines are the result of our CSI inflation toy model for Ne = 60 and δ(MPl) = 0.001 (continuos), 0.01 (dashed), 0.1 (dotted). For numerical purposes we took an upper bound ξ < e8
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