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Resurrecting Quadratic Inflation with a non-minimal coupling to gravity
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abstract
We study Quadratic Inflation with the inflaton field $\phi$ coupled non-minimally to the curvature scalar $R$, so that the potential during inflation is of the form $V\propto m^2\phi^2+\xi R\phi^2$. We show that with a suitable choice of the non-minimal coupling strength, $\xi=\mathcal{O}(10^{-3})$, one can resurrect the success of the scenario when compared against the Planck and BICEP2/Keck Array data, and that in the region of the parameter space which is still allowed the model predicts values of the tensor-to-scalar ratio in the range $0.01\leq r < 0.12$, making it possible to either confirm the scenario or rule it out already by the current or near-future experiments, such as BICEP3 or LiteBIRD. However, we show that in this case the near-future observations are unlikely to be able to distinguish between the metric and Palatini formulations of gravity.
Forward citations
Cited by 6 Pith papers
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A new class of metric-affine inflationary models, the ξ-tilde-attractors, reproduces Starobinsky inflation as a universal attractor in two strong-coupling limits.
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Generalized Galileon Scenario Inspires Chaotic Inflation
A power-law Galileon self-interaction suppresses the tensor-to-scalar ratio, allowing chaotic monomial inflation potentials to fit Planck 2018 data for constrained values of the coupling power n.
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