Palatini R2 quintessential inflation

Dimopoulos, Konstantinos and Karam, Alexandros and López, Samuel Sánchez and Tomberg, Eemeli (2022) Palatini R2 quintessential inflation. Journal of Cosmology and Astroparticle Physics, 10. ISSN 1475-7516

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We construct a model of quintessential inflation in Palatini R 2 gravity employing a scalar field with a simple exponential potential and coupled to gravity with a running non-minimal coupling. At early times, the field acts as the inflaton, while later on it becomes the current dark energy. Combining the scalar sector with an ideal fluid, we study the cosmological evolution of the model from inflation all the way to dark energy domination. We interpret the results in the Einstein frame, where a coupling emerges between the fluid and the field, feeding energy from the former to the latter during the matter-dominated era. We perform a numerical scan over the parameter space and find points that align with observations for both the inflationary CMB data and the late-time behaviour. The final dark energy density emerges from an interplay between the model parameters, without requiring the extreme fine-tuning of the cosmological constant in ΛCDM.

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Journal Article
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Journal of Cosmology and Astroparticle Physics
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13 Jun 2023 10:10
Last Modified:
16 Sep 2023 02:42