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2008

Inflation with Non-Minimal Coupling: Metric vs. Palatini Formulations

Bauer, Florian, Demir, Durmus A.

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We analyze non-minimally coupled scalar field theories in metric (second-order) and Palatini (first-order) formalisms in a comparative fashion.

After contrasting them in a general setup, we specialize to inflation and find that the two formalisms differ in their predictions for various cosmological parameters.
The main reason is that dependencies on the non-minimal coupling parameter are different in the two formalisms.
For successful inflation, the Palatini approach prefers a much larger value for the non-minimal coupling parameter than the Metric approach.

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