f(R) gravity: successes and challenges

Abstract

We review the state of the art of f(R) theories of gravity (in their various formulations), which have been proposed as an explanation of the cosmic acceleration alternative to dark energy. The successes of f(R) gravity are discussed, together with the challenges imposed by minimal criteria for their viability.

18 pages, latex. Presented at SIGRAV2008, 18th Congress of the Italian Society of General Relativity and Gravitation, Cosenza, Italy September 22-25, 2008

References in corpus (5)

• A Singularity Problem with f(R) Dark Energy
• Phantom and non-phantom dark energy: The cosmological relevance of non-locally corrected gravity
• Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
• The content of f(R) gravity
• Problems with Modified Theories of Gravity, as Alternatives to Dark Energy