Modelling Quintessential Inflation in Palatini Modified Gravity

Abstract

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.

arXiv comment20 pages, 7 figures, 1 table; published version

References in corpus (27)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Cosmological Imprint of an Energy Component with General Equation of State
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Planck 2018 results. X. Constraints on inflation
• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• Quintessential inflation
• Instant Preheating
• Simulations of the WFIRST Supernova Survey and Forecasts of Cosmological Constraints
• Turning Around the Sphaleron Bound: Electroweak Baryogenesis in an Alternative Post-inflationary Cosmology
• Palatini inflation in models with an $R^2$ term
• Inflation with $R^2$ term in the Palatini formalism
• Curvaton Reheating in Non-oscillatory Inflationary Models
• Non-minimal gravitational reheating during kination
• Ricci Reheating
• On the covariant formalism of the effective field theory of gravity and leading order corrections
• Warm Quintessential Inflation
• Gravitational reheating in quintessential inflation
• Hubble-induced phase transitions on the lattice with applications to Ricci reheating
• Curvaton reheating allows TeV Hubble scale in NO inflation
• A review of Quintessential Inflation
• Quintessential inflation in Palatini $f(R)$ gravity
• Quintessential inflation: A tale of emergent and broken symmetries
• Euclid: constraining dark energy coupled to electromagnetism using astrophysical and laboratory data
• Power-Law $f(R)$ Gravity Corrected Canonical Scalar Field Inflation
• What is needed of a scalar field if it is to unify inflation and late time acceleration ?