Abstract
We critically examine the recent claim that the standard model (SM) Higgs boson could drive inflation in agreement with observations if has a strong coupling to the Ricci curvature scalar. We first show that the effective-theory approach upon which that claim is based ceases to be valid beyond a cutoff scale , where is the reduced Planck mass. We then argue that knowing the Higgs potential profile for the field values relevant for inflation () requires knowledge of the ultraviolet completion of the SM beyond . In absence of such microscopic theory, the extrapolation of the pure SM potential beyond is unwarranted and the scenario is akin to other ad hoc inflaton potentials afflicted with significant fine-tuning. The appealing naturalness of this minimal proposal is therefore lost.
- Received 9 March 2009
DOI:https://doi.org/10.1103/PhysRevD.79.081302
©2009 American Physical Society