Quintessential inflation in Palatini $f(R)$ gravity

Abstract

We investigate in detail a family of quintessential inflation models in the context of $R+R^2$ Palatini modified gravity. We find that successful inflation and quintessence are obtained with an inflaton scalar potential that is approximately quadratic in inflation and inverse quartic in quintessence. We show that corrections for the kination period due to Palatini modified gravity are subdominant, while the setup does not challenge constraints on modified gravity from solar system observations and microscopic experiments, in contrast to the metric case. We obtain concrete predictions regarding primordial tensors, to be probed in the near future.

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Cited by in corpus (4)

• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• What is needed of a scalar field if it is to unify inflation and late time acceleration ?
• Gravitational particle production of superheavy massive particles in Quintessential Inflation: A numerical analysis
• Modelling Quintessential Inflation in Palatini Modified Gravity