  The expected tensor-to-scalar ratio estimate of the upcoming CMB mission
probe measurements may establish a lower value of the ratio than the currently
obtained value. It can be described in terms of a single field chaotic
inflation model along with the curvaton or quantum gravity or their combined
effect. Consequently, the role of quantum gravity or curvaton in the dynamics
of the early universe may not be ruled out. The curvaton scenario and quantum
gravity effect can be tested experimentally.
