Modelling Quintessential Inflation in Palatini Modified Gravity

We study a model of quintessential inflation constructed in \(R^2\) modified gravity with a non-minimally coupled scalar field, in the Palatini formalism. Our non-minimal inflaton field is characterised by a simple exponential potential. We find that successful quintessential inflation can be achiev...

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Published inarXiv.org
Main Authors Dimopoulos, Konstantinos, Karam, Alexandros, Samuel Sánchez López, Tomberg, Eemeli
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 01.04.2022
Subjects
Dark energy
Physics - Cosmology and Nongalactic Astrophysics
Physics - General Relativity and Quantum Cosmology
Physics - High Energy Physics - Phenomenology
Physics - High Energy Physics - Theory
Scalars
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Summary:We study a model of quintessential inflation constructed in \(R^2\) modified gravity with a non-minimally coupled scalar field, in the Palatini formalism. Our non-minimal inflaton field is characterised by a simple exponential potential. We find that successful quintessential inflation can be achieved with no fine-tuning on the model parameters. Predictions on the characteristics of dark energy will be tested by observations in the near future, while contrast with existing observations provides insights on the modified gravity background, such as the value of the non-minimal coupling and its running.
ISSN:2331-8422
DOI:10.48550/arxiv.2203.05424