The content of f(R) gravity

Abstract

We analyze the propagating degrees of freedom in gravity models where the scalar curvature in the action is replaced by a generic function $f(R)$ of the curvature. That these gravity models are equivalent to Einstein's gravity with an extra scalar field had previously been shown by applying a conformal transformation. We confirm this result by calculating the particle propagators. This provides further evidence of the unability of these models to explain the accelerated expansion of the Universe without contradicting solar system experiments.

References in corpus (13)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• Accelerated Universe from Gravity Leaking to Extra Dimensions
• Can modified gravity explain accelerated cosmic expansion?
• Ghost Inflation
• 1/R Curvature Corrections as the Source of the Cosmological Acceleration
• The Accelerated Universe and the Moon
• Differentiating between Modified Gravity and Dark Energy
• Gravitational Leakage into Extra Dimensions: Probing Dark Energy Using Local Gravity
• Palatini Formulation of Modified Gravity with $\ln R$ Terms
• On the Newtonian Limit in Gravity Models with Inverse Powers of R
• Infrared Modification of Gravity
• Palatini formulation of modified gravity with squared scalar curvature

Cited by in corpus (15)

• Beyond the Cosmological Standard Model
• Approaches to Understanding Cosmic Acceleration
• Ghost Constraints on Modified Gravity
• How (Not) to Palatini
• f(R) gravity: successes and challenges
• Cosmological dynamics in f(R) gravity
• Spherical collapse in f(R) gravity and the Belinskii-Khalatnikov-Lifshitz conjecture
• Stable super-inflating cosmological solutions in f(R)-gravity
• Slice Energy in Higher Order Gravity Theories and Conformal Transformations
• Small Cosmological Constant from Running Gravitational Coupling
• Galaxy Clustering in 3D and Modified Gravity Theories
• Thermodynamics of $f(R)$ Gravity with Disformal Transformation
• Oscillatons formed by non linear gravity
• Interior dynamics of neutral and charged black holes in f(R) gravity
• Slice Energy and Conformal Frames in Theories of Gravitation