Inflation from radion gauge-Higgs potential at Planck scale

Understand

We study whether the inflation is realized based on the radion gauge-Higgs potential obtained from the one-loop calculation in the 5-dimensional gravity coupled to a $U(1)$ gauge theory.

• We show that the gauge-Higgs can give rise to inflation in accord with the astrophysical data and the radion plays a role in fixing the values of physical parameters.
• We clarify the reason why the radion dominated inflation and the hybrid inflation cannot occur in our framework.