Softly Fine-Tuned Standard Model and the Scale of Inflation
arXiv:1510.08606 · doi:10.1142/S0217732315501795
Abstract
The direct coupling between the Higgs field and the spacetime curvature, if finely tuned, is known to stabilize the Higgs boson mass. The fine-tuning is soft because the Standard Model (SM) parameters are subject to no fine-tuning thanks to their independence from the Higgs-curvature coupling. This soft fine-tuning leaves behind a large vacuum energy which inflates the Universe with a Hubble rate , being the SM ultraviolet boundary. This means that the tensor-to-scalar ratio inferred from cosmic microwave background polarization measurements by BICEP2, Planck and others lead to the determination of . The exit from the inflationary phase, as usual, is accomplished via decays of the vacuum energy. Here we show that, identification of with the inflaton, as a sliding UV scale upon the SM, respects the soft fine-tuning constraint and does not disrupt the stability of the SM Higgs boson.
5 pages
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