Cosmic acceleration and the challenge of modifying gravity

Details Cosmic acceleration and the challenge of modifying gravity Cosmic acceleration and the challenge of modifying gravity

2010-11-03

arxiv.org/abs/1011.0861v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages, 1 figure. Plenary talk delivered at the 28th International Colloquium on Group Theoretical Methods in Physics, Newca

Scientific paper

I briefly discuss the challenges presented by attempting to modify general relativity to obtain an explanation for the observed accelerated expansion of the universe. Foremost among these are the questions of theoretical consistency - the avoidance of ghosts in particular - and the constraints imposed by precision local tests of gravity within the solar system. For those models that clear these highly constraining hurdles, modern observational cosmology offers its own suite of tests, improving with upcoming datasets, that offer the possibility of ruling out modified gravity approaches or providing an intriguing hint of new infrared physics. In the second half of the talk, I discuss a recent approach to extracting cosmology from higher-dimensional induced gravity models.

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