Ruling out an inflation driven by a power law potential: kinetic coupling does not help
Abstract
We demonstrate that the latest constraints on inflationary observables, namely the tensor-to-scalar ratio r and the scalar spectral index n_S, from the Cosmic Background Radiation (CMB) observations are already strong enough to rule out the model of a scalar field with a power law potential even in the presence of kinetic coupling to gravity with a positive coupling constant. The case for a negative coupling constant needs special treatment.
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