Palatini R 2 quintessential inflation

Dimopoulos, Konstantinos and Karam, Alexandros and Sánchez López, Samuel and Tomberg, Eemeli (2022) Palatini R 2 quintessential inflation. J. Cosmol. Astroparticle Phys., 2022 (10): 076. 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.

Item Type:
Journal Article
Journal or Publication Title:
J. Cosmol. Astroparticle Phys.
Uncontrolled Keywords:
?? paperdark energy theorygauss-bonnet-lovelock-horndeski-palatini etc gravity theoriesinflationmodified gravityastronomy and astrophysics ??
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26 Oct 2022 08:00
Last Modified:
08 Jan 2024 16:45