## Phenomenology of an Extended Higgs Portal Inflation Model after Planck 2013    [PDF]

Fa Peng Huang, Chong Sheng Li, Ding Yu Shao, Jian Wang
We propose an extended Higgs portal inflation model in which the new scalar field discussed by Weinberg to explain the fractional cosmic neutrinos is considered as the cosmological inflation field, assuming a nonminimal coupling of the scalar field to the gravity. Using the new data from Planck and other experiments, we obtain the relation of the nonminimal coupling $\xi$ and the self coupling $\lambda$ needed to drive the inflation. We find that our inflationary model is favored by the combined results of Planck and the relevant astrophysical data, since our prediction for $n_s$ and $r_{0.002}^*$ is well within the region allowed by the current astrophysical measurements for large $\xi$. We also discuss the constraints from the Higgs data at the LHC and the low energy precise data, and give the upper bounds of the nonminimal coupling $\xi$.
View original: http://arxiv.org/abs/1307.7458