Low-energy probes of the small cosmic microwave background amplitude in models of the radiative Higgs mechanism

Abstract The small cosmic microwave background (CMB) amplitude As ? 10?9 (or temperature fluctuation ?T/T 10?5) typically requires an unnaturally effective coupling of inflaton ?? ? 10?14. In models with non-minimal ?, extra suppression the amplitude, e.g. by inflaton’s large field values, usually allows to be much larger, but at price ? ? 1. Although difficulties have not been strictly quantified, ? 1 or are harder build. We show that absence new physics signals TeV scale can suggest a relatively $\xi \lesssim {\cal O}(1\mbox{--}100)$ $\lambda _\phi O}(10^{-4}\mbox{--}10^{-8})$, while constraining larger more strongly. Above all, this is possible connection between low- and high-energy made in scenarios where U(1)X Higgs high its renormalization running also induces Coleman–Weinberg mechanism for electroweak symmetry breaking low scale. best TeV-scale Z? resonances signal strengths. further find particularly useful since mass upper bounded order produce correct weak simultaenously. Utilizing intriguing bounds, we work out prospects LHC 13 100 pp colliders probing parameter space CMB such model.