Problems with Modified Theories of Gravity, as Alternatives to Dark Energy

Abstract

In this contribution to the conference "Beyond Einstein: Historical Perspectives on Geometry, Gravitation and Cosmology in the Twentieth Century", we give a critical status report of attempts to explain the late accelerated expansion of the universe by modifications of general relativity. Our brief review of such alternatives to the standard cosmological model addresses mainly readers who have not pursued the vast recent literature on this subject.

20 pages, 4 figures, Invited talk at the conference "BEYOND EINSTEIN", Mainz, 22 -- 26 September, 2008

References in corpus (23)

• Dynamics of dark energy
• f(R) Theories Of Gravity
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Disappearing cosmological constant in f(R) gravity
• Conditions for the cosmological viability of f(R) dark energy models
• The Cosmology of Generalized Modified Gravity Models
• Do consistent $F(R)$ models mimic General Relativity plus $\Lambda$?
• The Large Scale Structure of f(R) Gravity
• Constraining f(R) Gravity as a Scalar Tensor Theory
• The pattern of growth in viable f(R) cosmologies
• Distinguishing Modified Gravity from Dark Energy
• Dynamics of Linear Perturbations in f(R) Gravity
• Solar system and equivalence principle constraints on f(R) gravity by chameleon approach
• Cosmological perturbations in the Palatini formulation of modified gravity
• A Singularity Problem with f(R) Dark Energy
• Relativistic stars in f(R) gravity, and absence thereof
• Ghosts, Instabilities, and Superluminal Propagation in Modified Gravity Models
• Large-Scale Tests of the DGP Model
• A no-go theorem for polytropic spheres in Palatini f(R) gravity
• Parametrized Post-Friedmann Signatures of Acceleration in the CMB
• The Cauchy problem of f(R) gravity
• Hyperbolicity of scalar-tensor theories of gravity
• Chameleon Dark Energy

Cited by in corpus (11)

• A bird's eye view of f(R)-gravity
• Black hole entropy in scalar-tensor and f(R) gravity: an overview
• Conservation laws in gravitational theories with general nonminimal coupling
• f(R) gravity: successes and challenges
• Conservation laws in gravity: A unified framework
• Equations of motion in metric-affine gravity: A covariant unified framework
• Clifton's spherical solution in f(R) vacuo harbours a naked singularity
• Multipolar test body equations of motion in generalized gravity theories
• What kind of science is cosmology?
• A primer on problems and prospects of dark energy
• Horizons and singularity in Clifton's spherical solution of f(R) vacuum