Higgs inflation still alive
arXiv:1403.5043 · doi:10.1103/PhysRevLett.112.241301
Abstract
The observed value of the Higgs mass indicates that the Higgs potential becomes small and flat at the scale around $10^{17}$GeV. Having this fact in mind, we reconsider the Higgs inflation scenario proposed by Bezrukov and Shaposhnikov. It turns out that the non-minimal coupling $ξ$ of the Higgs-squared to the Ricci scalar can be smaller than ten. For example, $ξ=7$ corresponds to the tensor-to-scalar ratio $r\simeq0.2$, which is consistent with the recent observation by BICEP2.
7 pages, 3 figures; Version to appear on Physical Review Letters, footnotes added and expanded, references added, note added (v2)