Chaotic inflationary scenario of the Universe with a nonminimally coupled ‘‘inflaton’’ field

The possibility of the realization of a chaotic inflationary scenario is investigated in curved spacetime in which the inflaton couples nonminimally with the spacetime curvature such as (1/2ξR${\phi }^2$. It is found that the coupling effect prevents the scenario from working unless ξ is at least smaller than ${10}^{\mathrm{-}3}$ or negative.