Model Independent Tests of Cosmic Gravity

Details Model Independent Tests of Cosmic Gravity Model Independent Tests of Cosmic Gravity

2011-03-01

arxiv.org/abs/1103.0282v1

Phil. Trans. Roy. Soc. A 369, 4985 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 4 figures

Scientific paper

10.1098/rsta.2011.0288

Gravitation governs the expansion and fate of the universe, and the growth of large scale structure within it, but has not been tested in detail on these cosmic scales. The observed acceleration of the expansion may provide signs of gravitational laws beyond general relativity. Since the form of any such extension is not clear, from either theory or data, we adopt a model independent approach to parametrising deviations to the Einstein framework. We explore the phase space dynamics of two key post-GR functions and derive a classification scheme and an absolute criterion on accuracy necessary for distinguishing classes of gravity models. Future surveys will be able to constrain the post-GR functions' amplitudes and forms to the required precision, and hence reveal new aspects of gravitation.

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