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.

4 pages with 1 eps figure; title and abstract have been changed to better match with the result obtained; to appear in Gravitation and Cosmology

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Cited by in corpus (5)

• Reconciling early dark energy with a Harrison-Zeldovich spectrum
• On Inflationary Models in f(R,T) Gravity with a Kinetic Coupling Term
• The scalar-torsion gravity corrections in the first-order inflationary models
• The Inflationary Dynamics with the Scalar-Tensor Model
• Inflation in simple one-loop effective potentials of perturbative quantum gravity