Low-energy probes of small CMB amplitude in models of radiative Higgs mechanism

Abstract

The small CMB amplitude $A_s\simeq 10^{-9}$ (or, small temperature fluctuation $\delta T/T\simeq 10^{-5}$) typically requires an unnaturally small effective coupling of an inflaton ${\lambda }_{\varphi }\sim 10^{-14}$. In successful models, there usually is extra suppression of the amplitude, e.g. by large-field inflaton with non-minimal coupling $\xi$, so that ${\lambda }_{\varphi }$ can be much larger. But ${\lambda }_{\varphi }$ and $\xi$ cannot be $\sim \mathcal{O}(1)$ simultaneously; the naturalness burden is shared between them. We show that the absence of new physics signals at TeV scale may prefer a more natural size of $\xi \lesssim \mathcal{O}(1-100)$ with ${\lambda }_{\varphi }\lesssim \mathcal{O}(10^{-4}-10^{-8})$, constraining larger $\xi$ with larger ${\lambda }_{\varphi }$ more strongly. This intriguing connection between low- and high-energy physics is made in the scenarios with $U(1{)}_X$ where inflaton's renormalization running also induces Coleman-Weinberg mechanism for the electroweak symmetry breaking. We particularly work out the prospects of LHC 13 and 100 TeV $pp$ colliders for probing the parameter space of the small CMB amplitude.

16 pages, 4 figures

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• Leptogenesis triggered by a first-order phase transition