Quintessential inflation in Palatini F(R, X) gravity

Dimopoulos, Konstantinos and Racioppi, Antonio and Dioguardi, Christian and Hütsi, Gert (2025) Quintessential inflation in Palatini F(R, X) gravity. European Physical Journal Plus, 140 (11): 1109. ISSN 2190-5444

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Abstract

Palatini F(R, X) gravity, with X the inflaton kinetic term, proved to be a powerful framework for generating asymptotically flat inflaton potentials. Here we show that a quadratic Palatini F(R, X) restores compatibility with the observational data of the Peebles–Vilenkin quintessential inflation model. Moreover, the same can be achieved with an exponential version of the Peebles–Vilenkin potential if embedded in a Palatini F(R, X) of order higher than two.