Some Adventures in the Search for a Modified Gravity Explanation for Cosmic Acceleration

Details Some Adventures in the Search for a Modified Gravity Explanation for Cosmic Acceleration Some Adventures in the Search for a Modified Gravity Explanation for Cosmic Acceleration

2011-05-04

arxiv.org/abs/1105.0721v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, to appear in a festschrift for Joshua Goldberg

Scientific paper

The discovery of cosmic acceleration has raised the intriguing possibility that we are witnessing the first breakdown of General Relativity on cosmological scales. In this article I will briefly review current attempts to construct a theoretically consistent and observationally viable modification of gravity that is capable of describing the accelerating universe. I will discuss f(R) models, and their obvious extensions, and the DGP model as an example of extra-dimensional implementations. I will then briefly describe the Galileon models and their very recent multifield and curved space extensions - a class of four-dimensional effective field theories encoding extra dimensional modifications to gravity. This article is dedicated to the career of my friend and former colleague, Joshua Goldberg, and is written to appear in his festschrift.

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