Inflation in non-local hybrid metric-Palatini gravity

Abstract

Within the framework of hybrid metric-Palatini gravity, we incorporate non-localities introduced via the inverse of the d'Alembert operators acting on the scalar curvature. We analyse the dynamical structure of the theory and, adopting a scalar-tensor perspective, assess the stability conditions to ensure the absence of ghost instabilities. Focusing on a special class of well-defined hybrid actions -- where local and non-local contributions are carried by distinct types of curvature -- we investigate the feasibility of inflation within the resulting Einstein-frame multi-field scenario. We examine how the non-minimal kinetic couplings between the fields, reflecting the non-local structure of the original frame, influence the number of e-folds and the field trajectories. To clarify the physical interpretation of our results, we draw analogies with benchmark single-field inflation scenarios that include spectator fields.

26 pages, 4 figures

References in corpus (52)

• Dynamics of dark energy
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Beyond the Cosmological Standard Model
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Challenges for $\Lambda$CDM: An update
• Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• Cosmology Intertwined II: The Hubble Constant Tension
• The $H_0$ Olympics: A fair ranking of proposed models
• Modified f(R) gravity unifying R^m inflation with \LambdaCDM epoch
• Cosmology Intertwined III: $f{\sigma }_8$ and $S_8$
• Constraining f(R) Gravity as a Scalar Tensor Theory
• f(R) Gravity and Chameleon Theories
• Aspects of the cosmological "coincidence problem"
• Hyper Suprime-Cam Year 3 Results: Cosmology from Cosmic Shear Power Spectra
• DES Y3 + KiDS-1000: Consistent cosmology combining cosmic shear surveys
• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• The Cosmological Constant and the String Landscape
• Viability of f(R) Theories with Additional Powers of Curvature
• Cosmology of hybrid metric-Palatini f(X)-gravity
• Reconstructing the Distortion Function for Nonlocal Cosmology
• Testing Screened Modified Gravity
• Non-Local Gravity Cosmology: an Overview
• $f(R)$ gravity in the Jordan Frame as a Paradigm for the Hubble Tension
• Metric-Affine Gravity as an Effective Field Theory
• Inflation and dark energy from f(R) gravity
• Testing nonlocal gravity with Lunar Laser Ranging
• KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing
• Nonlocal Cosmology II --- Cosmic acceleration without fine tuning or dark energy
• Modified Gravity Constraints from the Full Shape Modeling of Clustering Measurements from DESI 2024
• Metric $f(R)$ gravity with dynamical dark energy as a scenario for the Hubble tension
• The Atacama Cosmology Telescope DR6 and DESI: Structure formation over cosmic time with a measurement of the cross-correlation of CMB Lensing and Luminous Red Galaxies
• Minimal coupling in presence of non-metricity and torsion
• $H_0$ Tension in Torsion-based Modified Gravity
• Exploring the Hubble tension with a late time Modified Gravity scenario
• CMB Anomalies and the Hubble Tension
• Alleviating $H_0$ Tension with New Gravitational Scalar Tensor Theories
• Alleviating $H_0$ tension in scalar-tensor and bi-scalar-tensor theories
• Planck-PR4 anisotropy spectra show (better) consistency with General Relativity
• Modified gravity in the presence of matter creation: scenario for the late Universe
• Tracking the Multifield Dynamics with Cosmological Data: A Monte Carlo approach
• Addressing Cosmological Tensions by Non-Local Gravity
• Exploring the Growth Index ${\gamma }_L$: Insights from Different CMB Dataset Combinations and Approaches
• Testing scale-invariant inflation against cosmological data
• Ghosts in classes of non-local gravity
• Adiabatic and isocurvature perturbations in extended theories with kinetic couplings
• Issues on the cosmological constant
• Tracing cosmic stretch marks: probing scale invariance in the early Universe
• Quasi-Palatini Formulation of Scalar-Tensor Gravity

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