PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Astroparticle Physics and Cosmology
Slow-roll inflation in Palatini F(R) gravity
A. Racioppi
Full text: pdf
Pre-published on: November 14, 2022
Published on: June 15, 2023
We study inflation in presence of Palatini $F(R)$ gravity. Since it is not always possible to find analytic solutions for the equation of motion of the auxiliary field corresponding to an arbitrary $F(R)$, we propose a new method for the computation of the inflationary observables. We test this method on $F(R) = R + \alpha R^n$ and find that a large $\alpha$ suppresses the tensor-to-scalar ratio $r$. We also notice that the configuration with $n=2$ is \emph{unstable}, while the $n>2$ case is ill-defined, with possible implications on the theoretically allowed UV behaviour of such Palatini models.
DOI: https://doi.org/10.22323/1.414.0073
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