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Ruling out an inflation driven by a power law potential: kinetic coupling does not help

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arxiv 2203.14599 v3 pith:Z3AXSP2U submitted 2022-03-28 gr-qc

classification gr-qc
keywords couplingconstantkineticpotentialpowerscalaralreadybackground
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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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  1. Corrections to inflationary models induced by non-minimal coupling between scalar field and curvature

    gr-qc 2026-07 conditional novelty 5.0 of 10

    Power-law non-minimal coupling F=(H/λ)^{2n} deforms inflationary potentials, shifts r and n_S while preserving n_T=-r/8 and GR-like reheating, enabling r(1-n_S) classification of models against Planck/ACT data.

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