Cosmic Acceleration and Modified Gravity

Abstract

I briefly discuss some attempts to construct a consistent modification to General Relativity (GR) that might explain the observed late-time acceleration of the universe and provide an alternative to dark energy. I mention the issues facing extensions to GR, illustrate these with two specific examples, and discuss the resulting observational and theoretical obstacles. This article comprises an invited talk at the NASA workshop {\it From Quantum to Cosmos: Fundamental Physics Research in Space}

12 pages, 1 figure. Invited talk at the NASA workshop - From Quantum to Cosmos: Fundamental Physics Research in Space, May 21-24 2006

References in corpus (8)

• 4D Gravity on a Brane in 5D Minkowski Space
• Cardassian Expansion: a Model in which the Universe is Flat, Matter Dominated, and Accelerating
• On Physical Equivalence between Nonlinear Gravity Theories
• Palatini form of 1/R gravity
• PPN-limit of Fourth Order Gravity inspired by Scalar-Tensor Gravity
• Constraining Inverse Curvature Gravity with Supernovae
• Softly Massive Gravity
• Inflatonless inflation

Cited by in corpus (15)

• Probing a nonlinear electrodynamics black hole with thin accretion disk, shadow and deflection angle with M87* and Sgr A* from EHT
• $Om$ diagnostic applied to scalar field models and slowing down of cosmic acceleration
• Accelerating Universe in Modified Theories of Gravity
• Standard Cosmological Evolution in a Wide Range of f(R) Models
• Ghost dark energy in $f(R)$ model of gravity
• Energy conditions in the $f(R,L,T)$ theory of gravity
• Observational Signatures: Shadow cast by the effective metric of photons for black holes with rational non-linear electrodynamics
• Geometrical Diagnostics for Generalized Chaplygin Gas
• Standard Cosmological Evolution in f(R) Model to Kaluza Klein Cosmology
• Holographic Dark Energy Like in $f(R)$ Gravity
• Probing Einstein-Maxwell-Scalar Black hole via Thin Accretion Disks and Shadows with EHT Observations of M87* and Sgr A*
• Cosmic Acceleration from Causal Backreaction with Recursive Nonlinearities
• Inflation constraints for classes of f(R) models
• Reconstructing f(R) model from Holographic DE: Using the observational evidence
• One-Dimensional Primordial Gravitational Waves In Pure Quadratic Gravity