Model Independent Tests of Cosmic Gravity

Abstract

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.

14 pages, 4 figures

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Cited by in corpus (13)

• The Paths of Gravity in Galileon Cosmology
• Cosmological Measurements with Forthcoming Radio Continuum Surveys
• Challenges in Connecting Modified Gravity Theory and Observations
• Testing Einstein Gravity with Cosmic Growth and Expansion
• The growth index of matter perturbations and modified gravity
• Effects of Dark Energy Perturbations on Cosmological Tests of General Relativity
• An Accelerating Cosmological Model from a Parametrization of Hubble Parameter
• The $\Lambda$CDM growth rate of structure revisited
• Disentangling dark energy and cosmic tests of gravity from weak lensing systematics
• Weak Lensing Science, Surveys, and Systematics
• A new approach to cosmological perturbations in f(R) models
• Constraining Scale Dependent Growth with Redshift Surveys
• The Direction of Gravity